/* =================================================================
   ZAOWUYUN · AI 应用中台  ·  Design System  v2 (图文并茂版)
   ================================================================= */

/* ---- THEME TOKENS ---- */
:root[data-theme="dark"] {
  --bg:          #0A0A0C;
  --bg-1:        #16161A;
  --bg-2:        #1C1C22;
  --bg-3:        #22222B;
  --line:        #2A2A35;
  --line-2:      #393948;
  --fg:          #FFFFFF;
  --fg-dim:      #A1A1AA;
  --fg-dim2:     #71717A;
  --fg-dim3:     #52525B;
  --accent:      #8B5CFF;
  --accent-hi:   #A78BFF;
  --accent-soft: rgba(139, 92, 255, 0.14);
  --accent-fg:   #FFFFFF;
  --surface-rgb: 255, 255, 255;
  --grid-stroke: rgba(255,255,255,0.045);
  --logo-filter: brightness(0) invert(1);
  --logo-opacity: 0.55;
  --logo-opacity-hover: 1;
  --noise-mix:   overlay;
  --code-bg:     #0e0e12;
  --code-fg:     #d4d4d8;
  --img-tint:    rgba(10,10,12,0.55);    /* image overlay for dark theme */
  --img-shadow:  0 18px 48px -16px rgba(0,0,0,0.6);
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg:          #FFFFFF;
  --bg-1:        #FAFAFA;
  --bg-2:        #F4F4F5;
  --bg-3:        #E9E9EC;
  --line:        #E5E5EA;
  --line-2:      #D4D4D8;
  --fg:          #0A0A0C;
  --fg-dim:      #52525B;
  --fg-dim2:     #71717A;
  --fg-dim3:     #A1A1AA;
  --accent:      #6102FF;
  --accent-hi:   #4E02CC;
  --accent-soft: rgba(97, 2, 255, 0.08);
  --accent-fg:   #FFFFFF;
  --surface-rgb: 0, 0, 0;
  --grid-stroke: rgba(0,0,0,0.05);
  --logo-filter: grayscale(1) brightness(0.35);
  --logo-opacity: 0.55;
  --logo-opacity-hover: 1;
  --noise-mix:   multiply;
  --code-bg:     #f6f6f8;
  --code-fg:     #18181b;
  --img-tint:    rgba(255,255,255,0.4);
  --img-shadow:  0 12px 32px -16px rgba(0,0,0,0.15);
  color-scheme: light;
}

html { background: var(--bg); }
body {
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
  color: var(--fg);
  background: var(--bg);
  letter-spacing: -0.005em;
  transition: background-color .25s ease, color .25s ease;
  margin: 0;
}
.mono { font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace; }
.display { font-family: 'Space Grotesk', 'Inter', sans-serif; font-weight:600; letter-spacing:-0.035em; line-height:1.1; }

::selection { background:var(--accent); color:var(--accent-fg); }

img { display: block; max-width: 100%; }

/* ============= BACKDROP ELEMENTS ============= */
.grid-bg {
  background-image:
    linear-gradient(to right, var(--grid-stroke) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-stroke) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: -1px -1px;
  mask-image: radial-gradient(ellipse at 50% 30%, #000 0%, #000 55%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 30%, #000 0%, #000 55%, transparent 85%);
}
.noise::after {
  content:""; position:absolute; inset:0;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.06 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  opacity: .55; pointer-events:none;
  mix-blend-mode: var(--noise-mix);
}
.accent-glow {
  background: radial-gradient(circle at 50% 30%, var(--accent-soft) 0%, transparent 55%);
}

/* gradient orb (for decorative backgrounds) */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  pointer-events: none;
}
.orb-accent { background: var(--accent); }
.orb-blue { background: #5b8def; }
.orb-pink { background: #ff5b9c; }

@keyframes orb-drift {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.1); }
  66% { transform: translate(-20px, 30px) scale(0.9); }
}
.orb-drift { animation: orb-drift 18s ease-in-out infinite; }

/* ============= BUTTONS ============= */
.btn-bracket {
  display: inline-flex; align-items: center; gap: .55rem;
  padding: .65rem 1rem;
  font-family: 'JetBrains Mono', monospace; font-size: .8125rem; line-height: 1;
  color: var(--fg);
  border: 1px solid var(--line-2);
  border-radius: 2px; background: transparent;
  transition: all .18s ease; position: relative;
  text-decoration: none;
}
.btn-bracket::before { content:"["; color:var(--fg-dim2); margin-right:.1rem; transition: all .18s ease; }
.btn-bracket::after  { content:"]"; color:var(--fg-dim2); margin-left:.1rem;  transition: all .18s ease; }
.btn-bracket:hover { border-color:var(--accent); color:var(--accent); }
.btn-bracket:hover::before { color:var(--accent); transform: translateX(-2px); }
.btn-bracket:hover::after  { color:var(--accent); transform: translateX(2px); }

.btn-primary {
  display:inline-flex; align-items:center; gap:.55rem;
  padding:.85rem 1.25rem;
  background:var(--accent); color:var(--accent-fg);
  border-radius:2px;
  font-family:'JetBrains Mono', monospace;
  font-size:.875rem; font-weight:500;
  transition: background .15s ease, box-shadow .15s ease;
  box-shadow: 0 4px 24px -8px var(--accent-soft);
  text-decoration: none;
  border: 0; cursor: pointer;
}
.btn-primary:hover { background:var(--accent-hi); }
.btn-primary .arr { transition: transform .2s ease; }
.btn-primary:hover .arr { transform: translateX(4px); }

.text-cta {
  display:inline-flex; align-items:center; gap:.4rem;
  font-family:'JetBrains Mono', monospace;
  font-size:.875rem; font-weight:500;
  color:var(--fg);
  opacity:.85;
  transition: opacity .15s ease, color .15s ease;
  text-decoration: none;
}
.text-cta .arr { transition: transform .2s ease; display:inline-block; }
.text-cta:hover { opacity:1; color:var(--accent); }
.text-cta:hover .arr { transform: translateX(4px); }

.btn-pill {
  display:inline-flex; align-items:center; gap:.4rem;
  padding:.35rem .85rem;
  border:1px solid var(--line-2); border-radius:9999px;
  font-family:'JetBrains Mono', monospace;
  font-size:.72rem; color:var(--fg-dim);
  background: transparent;
  transition: all .15s ease;
  text-decoration: none;
  cursor: pointer;
}
.btn-pill:hover { border-color:var(--accent); color:var(--accent); }
.btn-pill.is-active { border-color:var(--accent); color:var(--accent); }

.cursor::after {
  content:"_"; color:var(--accent);
  animation: blink 1.05s steps(1) infinite;
  margin-left:.05em;
}
@keyframes blink { 50% { opacity: 0; } }

/* ============= SECTION META ============= */
.sec-label {
  font-family:'JetBrains Mono', monospace;
  font-size:.72rem; letter-spacing:.15em;
  color:var(--fg-dim2); text-transform:uppercase;
}
.sec-label .num { color:var(--accent); margin-right:.5rem; }
.hr-thin { height:1px; background:var(--line); }

/* ============= CARDS ============= */
.card {
  background: rgba(var(--surface-rgb), 0.03);
  border: 1px solid rgba(var(--surface-rgb), 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 4px;
  transition: all .22s ease;
}
.card:hover {
  background: rgba(var(--surface-rgb), 0.08);
  border-color: rgba(var(--surface-rgb), 0.2);
}
.card-accent:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 32px -16px var(--accent-soft);
}

/* ============= LINKS ============= */
.link-arrow {
  font-family:'JetBrains Mono', monospace; font-size:.8125rem;
  color:var(--fg);
  display:inline-flex; align-items:center; gap:.35rem;
  border-bottom: 1px solid transparent; padding-bottom:2px;
  transition: color .15s ease, border-color .15s ease;
  text-decoration: none;
}
.link-arrow:hover { color:var(--accent); border-bottom-color:var(--accent); }
.link-arrow .arr { transition: transform .2s ease; }
.link-arrow:hover .arr { transform: translateX(4px); }

a { color: inherit; }

/* ============= REVEAL ANIMATIONS ============= */
[data-reveal] { opacity:0; transform:translateY(20px); transition:opacity .65s ease, transform .65s ease; }
[data-reveal].in { opacity:1; transform:none; }

[data-reveal-slow] { opacity:0; transform:translateY(30px); transition:opacity 1s ease, transform 1s ease; }
[data-reveal-slow].in { opacity:1; transform:none; }

[data-reveal-clip] {
  clip-path: inset(0 100% 0 0);
  transition: clip-path 1.1s cubic-bezier(.7,.0,.3,1);
}
[data-reveal-clip].in { clip-path: inset(0 0 0 0); }

[data-reveal-zoom] { opacity:0; transform:scale(0.94); transition:opacity .8s ease, transform .8s ease; }
[data-reveal-zoom].in { opacity:1; transform:none; }

.word-reveal .w {
  display: inline-block;
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1);
}
.word-reveal.in .w { opacity: 1; transform: none; }
.word-reveal.in .w:nth-child(1)  { transition-delay: .00s; }
.word-reveal.in .w:nth-child(2)  { transition-delay: .06s; }
.word-reveal.in .w:nth-child(3)  { transition-delay: .12s; }
.word-reveal.in .w:nth-child(4)  { transition-delay: .18s; }
.word-reveal.in .w:nth-child(5)  { transition-delay: .24s; }
.word-reveal.in .w:nth-child(6)  { transition-delay: .30s; }
.word-reveal.in .w:nth-child(7)  { transition-delay: .36s; }
.word-reveal.in .w:nth-child(8)  { transition-delay: .42s; }

.stagger > * { transition-delay: 0s; }
.stagger.in > *:nth-child(1) { transition-delay: .00s; }
.stagger.in > *:nth-child(2) { transition-delay: .08s; }
.stagger.in > *:nth-child(3) { transition-delay: .16s; }
.stagger.in > *:nth-child(4) { transition-delay: .24s; }
.stagger.in > *:nth-child(5) { transition-delay: .32s; }
.stagger.in > *:nth-child(6) { transition-delay: .40s; }
.stagger.in > *:nth-child(7) { transition-delay: .48s; }
.stagger.in > *:nth-child(8) { transition-delay: .56s; }

/* float / pulse */
@keyframes float-up {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.float-up { animation: float-up 5s ease-in-out infinite; }

@keyframes pulse-ring {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-soft); }
  50% { box-shadow: 0 0 0 16px transparent; }
}
.pulse-ring { animation: pulse-ring 2.4s ease-in-out infinite; }

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.shimmer-bg {
  background: linear-gradient(90deg, rgba(var(--surface-rgb), 0.04) 0%, rgba(var(--surface-rgb), 0.12) 50%, rgba(var(--surface-rgb), 0.04) 100%);
  background-size: 200% 100%;
  animation: shimmer 2.4s ease-in-out infinite;
}

/* ============= MARQUEE ============= */
.marquee {
  overflow: hidden;
  mask-image: linear-gradient(to right, transparent, #000 6%, #000 94%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, #000 6%, #000 94%, transparent);
}
.marquee-track {
  display:flex; align-items:center; gap:4rem;
  width: max-content;
  animation: marquee 50s linear infinite;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ============= LOGOS ============= */
.client-logo {
  height: 32px;
  max-width: 130px;
  width: auto;
  object-fit: contain;
  filter: var(--logo-filter);
  opacity: var(--logo-opacity);
  transition: opacity .25s ease, filter .25s ease, transform .25s ease;
}
.client-logo:hover {
  opacity: var(--logo-opacity-hover);
  filter: none;
  transform: scale(1.04);
}
.logo-grid-cell {
  height: 88px;
  border: 1px solid var(--line);
  background: rgba(var(--surface-rgb), 0.02);
  display:flex; align-items:center; justify-content:center;
  padding: 1rem;
  transition: all .2s ease;
  border-radius: 2px;
}
.logo-grid-cell:hover {
  background: rgba(var(--surface-rgb), 0.05);
  border-color: var(--line-2);
}

/* ============= IMAGES =================== */

/* Aspect ratio helpers */
.aspect-hero    { aspect-ratio: 21/9; }
.aspect-wide    { aspect-ratio: 16/9; }
.aspect-card    { aspect-ratio: 3/2; }
.aspect-square  { aspect-ratio: 1/1; }
.aspect-portrait{ aspect-ratio: 4/5; }
.aspect-tablet  { aspect-ratio: 4/3; }

/* Image fill wrapper */
.img-wrap {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  background: var(--bg-2);
}
.img-wrap img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform .8s cubic-bezier(.2,.7,.2,1), filter .4s ease;
}

/* Zoom on hover */
.img-zoom:hover img { transform: scale(1.06); }

/* Image tints / overlays */
.img-tint::after {
  content:""; position:absolute; inset:0;
  background: var(--img-tint);
  pointer-events: none;
}
.img-vignette::after {
  content:""; position:absolute; inset:0;
  background: linear-gradient(180deg, transparent 0%, transparent 50%, rgba(0,0,0,0.7) 100%);
  pointer-events: none;
}
.img-grad-purple::after {
  content:""; position:absolute; inset:0;
  background: linear-gradient(135deg, rgba(139,92,255,0.5) 0%, rgba(10,10,12,0.4) 100%);
  pointer-events: none;
  mix-blend-mode: multiply;
}

/* Image grain (subtle film grain) */
.img-grain::before {
  content:""; position:absolute; inset:0; z-index:1; pointer-events:none;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.08 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  mix-blend-mode: overlay;
}

/* Placeholder label (visible during prototype, easy to identify) */
.ph-label {
  position: absolute;
  top: .5rem; left: .5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: .65rem;
  color: rgba(255,255,255,0.7);
  background: rgba(0,0,0,0.6);
  padding: .15rem .5rem;
  border-radius: 2px;
  letter-spacing: .05em;
  z-index: 2;
  pointer-events: none;
}

/* ============= HERO WITH IMAGE ============= */
.hero-with-image {
  position: relative;
  min-height: 720px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-image-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-image-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.hero-image-bg::after {
  content:""; position: absolute; inset: 0;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--bg) 92%, transparent) 0%,
    color-mix(in srgb, var(--bg) 50%, transparent) 50%,
    color-mix(in srgb, var(--bg) 95%, transparent) 100%);
}

/* Hero side-image (image on right) */
.hero-split {
  display: grid;
  gap: 3rem;
  align-items: center;
}
@media (min-width: 1024px) {
  .hero-split { grid-template-columns: 1.1fr 1fr; }
}

/* ============= FEATURE ROW (Accenture-style) ============= */
.feature-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 1024px) {
  .feature-row { grid-template-columns: 1fr 1.3fr; }
  .feature-row.reverse > :first-child { order: 2; }
}

/* ============= CONTENT CAROUSEL (Accenture-style insight rail) ============= */
.insight-rail {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--line-2) transparent;
  padding-bottom: 1rem;
  -webkit-overflow-scrolling: touch;
}
.insight-rail::-webkit-scrollbar { height: 6px; }
.insight-rail::-webkit-scrollbar-track { background: transparent; }
.insight-rail::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 3px; }
.insight-rail > * {
  flex: 0 0 320px;
  scroll-snap-align: start;
}
@media (min-width: 768px) {
  .insight-rail > * { flex: 0 0 380px; }
}

/* ============= CAPABILITIES × INDUSTRIES MATRIX ============= */
.matrix {
  display: grid;
  grid-template-columns: 160px repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
}
.matrix-cell {
  background: var(--bg-1);
  padding: 1.1rem .9rem;
  min-height: 92px;
  display: flex; flex-direction: column;
  justify-content: space-between; gap: .4rem;
  transition: all .18s ease;
  text-decoration: none;
  cursor: pointer;
}
.matrix-cell:hover {
  background: var(--bg-2);
  box-shadow: inset 2px 0 0 var(--accent);
}
.matrix-corner {
  background: rgba(var(--surface-rgb), 0.02);
  font-family: 'JetBrains Mono', monospace;
  font-size: .68rem; color: var(--fg-dim2);
  text-transform: uppercase; letter-spacing: .1em;
  display: flex; align-items: end; justify-content: end;
  padding: .8rem;
  cursor: default;
}
.matrix-corner:hover { background: rgba(var(--surface-rgb), 0.02); box-shadow: none; }
.matrix-header-h {
  background: rgba(var(--surface-rgb), 0.02);
  padding: .8rem .9rem;
  cursor: default;
}
.matrix-header-h:hover { background: rgba(var(--surface-rgb), 0.02); box-shadow: none; }
.matrix-header-h .name {
  font-weight: 500; font-size: .9rem; color: var(--fg);
}
.matrix-header-h .meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: .65rem; color: var(--fg-dim2);
  text-transform: uppercase; margin-top: .2rem;
}
.matrix-header-v {
  background: rgba(var(--surface-rgb), 0.02);
  padding: .9rem .9rem;
  cursor: default;
}
.matrix-header-v:hover { background: rgba(var(--surface-rgb), 0.02); box-shadow: none; }
.matrix-header-v .name { font-weight: 500; font-size: .9rem; color: var(--fg); }
.matrix-header-v .meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: .65rem; color: var(--fg-dim2); text-transform: uppercase;
  margin-top: .2rem;
}

@media (max-width: 900px) {
  .matrix { grid-template-columns: 1fr; }
  .matrix-header-h { display: none; }
  .matrix-corner { display: none; }
}

/* ============= CHAT BUBBLES ============= */
.bubble-them {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: .65rem .65rem .65rem .15rem;
  padding: .75rem 1rem; font-size: .875rem;
}
.bubble-me {
  background: var(--accent); color: var(--accent-fg);
  border-radius: .65rem .65rem .15rem .65rem;
  padding: .75rem 1rem; font-size: .875rem;
}
.avatar {
  width:2rem; height:2rem; border-radius:9999px;
  display:flex; align-items:center; justify-content:center;
  font-family:'JetBrains Mono', monospace; font-size:.75rem;
}
.avatar-bot { background: var(--accent); color: var(--accent-fg); font-weight:500; }
.avatar-user { background: var(--bg-1); border: 1px solid var(--line); color: var(--fg-dim); }

/* ============= NAV  ============= */
.nav-bar { background: color-mix(in srgb, var(--bg) 80%, transparent); }
.nav-mega {
  position: absolute;
  top: 100%; left: 0; right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  display: none;
  z-index: 60;
}
.nav-item-with-mega:hover .nav-mega,
.nav-mega:hover { display: block; }
.nav-mega-column { padding: 0 1.5rem; }
.nav-mega-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: .7rem; color: var(--fg-dim2);
  text-transform: uppercase; letter-spacing: .12em;
  padding-bottom: .8rem; margin-bottom: .8rem;
  border-bottom: 1px solid var(--line);
}
.nav-mega-link {
  display: block;
  padding: .35rem 0;
  font-size: .92rem; color: var(--fg-dim);
  transition: color .15s ease, padding-left .15s ease;
}
.nav-mega-link:hover { color: var(--accent); padding-left: .35rem; }

/* ============= THEME TOGGLE & LANG SWITCH ============= */
.toggle {
  width: 44px; height: 44px;
  display: inline-flex; align-items:center; justify-content:center;
  border: 1px solid var(--line-2);
  border-radius: 2px;
  color: var(--fg-dim);
  transition: all .18s ease;
  cursor: pointer;
  background: transparent;
}
.toggle:hover { border-color: var(--accent); color: var(--accent); }
:root[data-theme="light"] .toggle .icon-sun { display: none; }
:root[data-theme="dark"]  .toggle .icon-moon { display: none; }

.lang-switch {
  display: inline-flex; align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem; color: var(--fg-dim);
  border: 1px solid var(--line-2);
  border-radius: 2px;
  background: transparent; padding: 0 .55rem; height: 36px;
  cursor: pointer;
  transition: all .15s ease;
}
.lang-switch:hover { border-color: var(--accent); color: var(--accent); }

/* ============= FLOW STEP ============= */
.flow-step {
  background: rgba(var(--surface-rgb), 0.03);
  border: 1px solid rgba(var(--surface-rgb), 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 4px;
  padding: 1.25rem 1rem;
  position: relative;
  transition: all .22s ease;
}
.flow-step:hover {
  background: rgba(var(--surface-rgb), 0.08);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ============= NUMBER STAT ============= */
.stat-big {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.0;
  font-size: clamp(48px, 6vw, 96px);
}

/* ============= TIMELINE ============= */
.timeline { position:relative; padding-left: 1.75rem; }
.timeline::before {
  content:""; position:absolute; left: .5rem; top: 0; bottom: 0;
  width: 1px; background: var(--line);
}
.timeline-item { position:relative; padding-bottom: 2rem; }
.timeline-item::before {
  content:""; position:absolute; left:-1.5rem; top: .35rem;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
}

/* ============= BADGES ============= */
.badge-status {
  display:inline-flex; align-items:center; gap:.35rem;
  padding: .2rem .6rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: .68rem; letter-spacing: .05em;
  border: 1px solid var(--line-2);
  border-radius: 9999px;
  color: var(--fg-dim);
  background: rgba(var(--surface-rgb), 0.04);
}
.badge-status.is-live { color: var(--accent); border-color: var(--accent); }
.badge-status .dot {
  display:inline-block; width:6px; height:6px; border-radius:50%;
  background: currentColor;
}

/* ============= CODE BLOCK ============= */
.code-block {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1.25rem 1.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: .8125rem;
  color: var(--code-fg);
  overflow-x: auto;
  line-height: 1.6;
}
.code-block .comment { color: var(--fg-dim2); }
.code-block .kw { color: #c084fc; }
.code-block .str { color: #86efac; }
.code-block .num { color: #fcd34d; }

/* ============= FORM ============= */
.form-field { display:flex; flex-direction:column; gap:.4rem; }
.form-field label {
  font-family:'JetBrains Mono', monospace;
  font-size: .72rem; text-transform: uppercase; letter-spacing:.1em;
  color: var(--fg-dim2);
}
.form-field input,
.form-field textarea,
.form-field select {
  font-family: inherit; font-size: .9rem;
  background: rgba(var(--surface-rgb), 0.02);
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: 2px;
  padding: .7rem .85rem;
  transition: border-color .15s ease, background .15s ease;
}
.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(var(--surface-rgb), 0.04);
}
.form-field textarea { min-height: 120px; resize: vertical; }

/* ============= LAYOUT ============= */
.container { max-width: 1280px; margin: 0 auto; padding: 0 1.5rem; }
@media (min-width: 1024px) { .container { padding: 0 2.5rem; } }

.container-wide { max-width: 1480px; margin: 0 auto; padding: 0 1.5rem; }
@media (min-width: 1024px) { .container-wide { padding: 0 2.5rem; } }

.full-bleed { width: 100%; }

.text-balance { text-wrap: balance; }

/* Audience card (kept for legacy pages) */
.audience-card {
  display:block;
  padding: 1.5rem 1.25rem;
  border: 1px solid var(--line);
  background: rgba(var(--surface-rgb), 0.025);
  border-radius: 4px;
  transition: all .2s ease;
  text-decoration: none;
}
.audience-card:hover {
  border-color: var(--accent);
  background: rgba(var(--surface-rgb), 0.06);
  transform: translateY(-2px);
}
.audience-card .icon {
  width: 2.25rem; height: 2.25rem;
  display:flex; align-items:center; justify-content:center;
  border-radius: 4px;
  background: rgba(var(--surface-rgb), 0.04);
  font-family: 'JetBrains Mono', monospace;
  font-size: .9rem; color: var(--accent);
  margin-bottom: .85rem;
}

/* News card (kept) */
.news-card {
  display:block; padding: 1.5rem;
  border: 1px solid var(--line);
  background: rgba(var(--surface-rgb), 0.02);
  border-radius: 4px;
  transition: all .2s ease;
  text-decoration: none;
}
.news-card:hover {
  border-color: var(--accent);
  background: rgba(var(--surface-rgb), 0.05);
}

/* Pillar (kept for legacy) */
.pillar {
  position: relative;
  padding: 2.5rem 2rem;
  border: 1px solid var(--line);
  background: rgba(var(--surface-rgb), 0.02);
  border-radius: 4px;
  transition: all .22s ease;
  overflow: hidden;
}
.pillar:hover {
  border-color: var(--accent);
  background: rgba(var(--surface-rgb), 0.05);
}
.pillar::before {
  content:""; position:absolute; top:0; left:0; right:0; height:1px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
  opacity: 0; transition: opacity .25s ease;
}
.pillar:hover::before { opacity: 1; }

/* Mobile */
@media (max-width: 768px) {
  .marquee-track { animation-duration: 28s; }
}

/* =================================================================
   AMS · 智能体管理学  ·  Site-Specific Extensions
   ================================================================= */

/* ---- MODULE COLORS (6 重写 + 治理神经) ---- */
:root {
  --mod-1: #8B5CFF;   /* 模块一·竞争重写  */
  --mod-2: #5BE5A0;   /* 模块二·组织重写  */
  --mod-3: #FFB85B;   /* 模块三·产品重写  */
  --mod-4: #5BB5FF;   /* 模块四·系统重写  */
  --mod-5: #FF6B8A;   /* 模块五·价值重写  */
  --mod-6: #FFD45B;   /* 模块六·人类重写  */
  --mod-g: #B5B5B5;   /* 治理神经         */
}

/* per-module color application via data-module */
[data-module="1"] { --mod-c: var(--mod-1); }
[data-module="2"] { --mod-c: var(--mod-2); }
[data-module="3"] { --mod-c: var(--mod-3); }
[data-module="4"] { --mod-c: var(--mod-4); }
[data-module="5"] { --mod-c: var(--mod-5); }
[data-module="6"] { --mod-c: var(--mod-6); }
[data-module="g"] { --mod-c: var(--mod-g); }

/* ---- MODULE BADGE ---- */
.mod-badge {
  display:inline-flex; align-items:center; gap:.5rem;
  padding:.35rem .7rem;
  font-family:'JetBrains Mono', monospace;
  font-size:.7rem; letter-spacing:.08em;
  color: var(--mod-c, var(--accent));
  border:1px solid var(--mod-c, var(--accent));
  background: color-mix(in srgb, var(--mod-c, var(--accent)) 8%, transparent);
  border-radius: 9999px;
  text-transform: uppercase;
}
.mod-badge .dot {
  width:6px; height:6px; border-radius:50%;
  background: var(--mod-c, var(--accent));
}

/* ---- MODULE CARD (used on home page system overview) ---- */
.module-card {
  position: relative;
  display:block;
  padding: 1.75rem 1.5rem;
  border: 1px solid var(--line);
  background: rgba(var(--surface-rgb), 0.025);
  border-radius: 6px;
  transition: all .25s ease;
  text-decoration: none;
  overflow: hidden;
}
.module-card::before {
  content:""; position:absolute; top:0; left:0; right:0; height:2px;
  background: var(--mod-c, var(--accent));
  opacity: .6;
  transition: opacity .25s ease, height .25s ease;
}
.module-card:hover {
  border-color: var(--mod-c, var(--accent));
  background: rgba(var(--surface-rgb), 0.06);
  transform: translateY(-3px);
}
.module-card:hover::before {
  opacity: 1; height: 3px;
}
.module-card .mod-num {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 600;
  font-size: 1.5rem; line-height: 1.1;
  color: var(--mod-c, var(--accent));
  letter-spacing: -.005em;
  opacity: .95;
}
.module-card .mod-title {
  font-family:'Space Grotesk', sans-serif;
  font-weight: 600; font-size: 1.4rem;
  letter-spacing: -.02em; line-height: 1.15;
  color: var(--fg);
  margin-top: .3rem;
}
.module-card .mod-range {
  font-family:'JetBrains Mono', monospace;
  font-size: .72rem; color: var(--fg-dim2);
  letter-spacing: .08em; text-transform: uppercase;
  margin-top: .8rem;
}
.module-card .mod-claim {
  margin-top: .85rem;
  font-size: .9rem; line-height: 1.55;
  color: var(--fg-dim);
}
.module-card .mod-arrow {
  position: absolute; top: 1.5rem; right: 1.5rem;
  color: var(--fg-dim3); transition: color .2s ease, transform .2s ease;
}
.module-card:hover .mod-arrow {
  color: var(--mod-c, var(--accent));
  transform: translateX(4px);
}

/* ---- FRAMEWORK CARD (relaxed, breathing list item) ---- */
.fw-card {
  display:flex; align-items:flex-start; gap: 1.2rem;
  padding: 1.35rem 1.45rem;
  border: 1px solid var(--line);
  background: rgba(var(--surface-rgb), 0.02);
  border-radius: 5px;
  transition: all .2s ease;
  text-decoration: none;
}
.fw-card:hover {
  border-color: var(--mod-c, var(--accent));
  background: rgba(var(--surface-rgb), 0.05);
  transform: translateX(2px);
}
.fw-card .fw-num {
  font-family:'JetBrains Mono', monospace;
  font-size: .95rem;
  color: var(--mod-c, var(--accent));
  font-weight: 500;
  letter-spacing: .05em;
  flex-shrink: 0;
  padding-top: .18rem;
  min-width: 2.9rem;
}
.fw-card .fw-body { flex: 1; min-width: 0; display:flex; flex-direction:column; gap:.6rem; }
.fw-card .fw-title {
  font-family:'Space Grotesk', 'Inter', sans-serif;
  font-weight: 500; font-size: 1.16rem;
  color: var(--fg); line-height: 1.3;
  letter-spacing: -.01em;
}
.fw-card .fw-sub {
  font-size: .9rem; color: var(--fg-dim);
  line-height: 1.62;
}

/* ---- FRAMEWORK HERO (per-framework page) ---- */
.fw-hero {
  position: relative;
  padding: 7rem 0 4rem;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.fw-hero::before {
  content:""; position:absolute; inset:0;
  background: radial-gradient(ellipse at 20% 30%,
    color-mix(in srgb, var(--mod-c, var(--accent)) 14%, transparent) 0%,
    transparent 55%);
  pointer-events: none;
}
.fw-hero .fw-eyebrow {
  font-family:'JetBrains Mono', monospace;
  font-size: .72rem; letter-spacing: .15em; text-transform: uppercase;
  color: var(--fg-dim2);
  display:inline-flex; align-items:center; gap: .6rem;
}
.fw-hero .fw-eyebrow .num { color: var(--mod-c, var(--accent)); }
.fw-hero h1 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 600;
  font-size: clamp(34px, 5.4vw, 68px);
  letter-spacing: -.035em;
  line-height: 1.02;
  margin-top: 1.25rem;
  max-width: 1080px;
}
.fw-hero h1 .en {
  display: block;
  font-family:'JetBrains Mono', monospace;
  font-weight: 400;
  font-size: .35em;
  color: var(--fg-dim);
  letter-spacing: .02em;
  margin-top: .8rem;
  line-height: 1.4;
}
.fw-hero .claim {
  margin-top: 1.75rem;
  max-width: 880px;
  font-size: clamp(16px, 1.4vw, 20px);
  line-height: 1.55;
  color: var(--fg-dim);
  border-left: 2px solid var(--mod-c, var(--accent));
  padding-left: 1rem;
}

/* ---- AT-A-GLANCE summary strip ---- */
.glance {
  display:grid; gap: 1.5rem;
  grid-template-columns: 1fr;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}
@media (min-width: 768px) {
  .glance { grid-template-columns: 1fr 1fr 1fr; }
}
.glance-cell { display:flex; flex-direction: column; gap: .5rem; }
.glance-label {
  font-family:'JetBrains Mono', monospace;
  font-size: .68rem; color: var(--fg-dim2);
  text-transform: uppercase; letter-spacing: .12em;
}
.glance-value {
  font-size: .98rem; line-height: 1.55;
  color: var(--fg);
}

/* ---- FRAMEWORK BODY LAYOUT (long article + sticky side cards) ---- */
.fw-layout {
  display: grid;
  gap: 3rem;
  grid-template-columns: 1fr;
  padding: 4rem 0 5rem;
}
@media (min-width: 1024px) {
  .fw-layout {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 4rem;
  }
}

/* Long-form article */
.fw-article {
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--fg-dim);
  letter-spacing: -.002em;
}
.fw-article h2 {
  font-family:'Space Grotesk', 'Inter', sans-serif;
  font-weight: 600;
  font-size: 1.55rem;
  letter-spacing: -.02em;
  color: var(--fg);
  margin: 3rem 0 1.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  display: flex; align-items: baseline; gap: .85rem;
}
.fw-article h2:first-child { margin-top: 0; border-top: 0; padding-top: 0; }
.fw-article h2 .num {
  font-family:'JetBrains Mono', monospace;
  font-size: .85rem; font-weight: 500;
  color: var(--mod-c, var(--accent));
  letter-spacing: .1em;
}
.fw-article h3 {
  font-weight: 600; font-size: 1.08rem;
  color: var(--fg);
  margin: 1.75rem 0 .75rem;
}
.fw-article p { margin: 0 0 1.15rem; }
.fw-article strong, .fw-article b {
  color: var(--fg);
  font-weight: 600;
}
.fw-article em { color: var(--fg-dim2); font-style: normal; }
.fw-article blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: rgba(var(--surface-rgb), 0.03);
  border-left: 2px solid var(--mod-c, var(--accent));
  border-radius: 0 4px 4px 0;
  font-size: .96rem;
}
.fw-article .theory-note {
  margin: 1.75rem 0;
  padding: 1rem 1.25rem;
  background: rgba(var(--surface-rgb), 0.03);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: .88rem;
  line-height: 1.65;
  color: var(--fg-dim);
}
.fw-article .theory-note strong { color: var(--fg); }

/* Sticky side rail */
.fw-side {
  display: flex; flex-direction: column; gap: 1.5rem;
}
@media (min-width: 1024px) {
  .fw-side {
    position: sticky;
    top: 6rem;
    align-self: start;
    max-height: calc(100vh - 7rem);
    overflow-y: auto;
    padding-right: .5rem;
    scrollbar-width: thin;
  }
  .fw-side::-webkit-scrollbar { width: 6px; }
  .fw-side::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 3px; }
}

.side-card {
  background: rgba(var(--surface-rgb), 0.03);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1.25rem 1.25rem;
}
.side-card .side-title {
  font-family:'JetBrains Mono', monospace;
  font-size: .7rem; color: var(--mod-c, var(--accent));
  text-transform: uppercase; letter-spacing: .14em;
  margin-bottom: .9rem;
  display:flex; align-items:center; gap: .5rem;
}
.side-card .side-title::before {
  content:""; width:8px; height: 1px;
  background: var(--mod-c, var(--accent));
}

/* Operation steps S1-S4 */
.op-step {
  display: grid;
  grid-template-columns: 2.25rem 1fr;
  gap: .9rem;
  padding: .85rem 0;
  border-top: 1px solid var(--line);
}
.op-step:first-of-type { border-top: 0; padding-top: 0; }
.op-step:last-of-type { padding-bottom: 0; }
.op-step .op-num {
  font-family:'JetBrains Mono', monospace;
  font-size: .82rem; font-weight: 500;
  color: var(--mod-c, var(--accent));
  letter-spacing: .04em;
  padding-top: .15rem;
}
.op-step .op-text {
  font-size: .9rem; line-height: 1.55;
  color: var(--fg-dim);
}
.op-step .op-text strong { color: var(--fg); font-weight: 500; }

/* Side-card insight (highlighted block) */
.side-insight {
  font-size: .95rem; line-height: 1.65;
  color: var(--fg);
  font-style: italic;
}

/* Pros/Cons list */
.pros-cons { display:flex; flex-direction: column; gap: .55rem; }
.pc-item {
  display:flex; gap: .55rem;
  font-size: .85rem; line-height: 1.55;
  color: var(--fg-dim);
}
.pc-item .pc-mark {
  flex-shrink: 0;
  font-family:'JetBrains Mono', monospace;
  font-weight: 600;
}
.pc-item.pro .pc-mark { color: var(--mod-c, var(--accent)); }
.pc-item.con .pc-mark { color: var(--fg-dim3); }

/* Resource links */
.res-link {
  display:flex; align-items:center; justify-content:space-between;
  padding: .65rem .85rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(var(--surface-rgb), 0.02);
  font-family:'JetBrains Mono', monospace;
  font-size: .8rem;
  color: var(--fg-dim);
  text-decoration: none;
  transition: all .18s ease;
  margin-bottom: .5rem;
}
.res-link:not(.disabled):hover {
  border-color: var(--mod-c, var(--accent));
  color: var(--mod-c, var(--accent));
}
.res-link.disabled {
  opacity: .6;
  cursor: not-allowed;
}
.res-link .soon {
  font-size: .65rem;
  color: var(--fg-dim3);
  letter-spacing: .08em;
}

/* Related frameworks list */
.rel-list { display: flex; flex-direction: column; gap: .55rem; }
.rel-item {
  display:flex; align-items:baseline; gap: .65rem;
  padding: .55rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: padding-left .18s ease;
}
.rel-item:last-child { border-bottom: 0; }
.rel-item:hover { padding-left: .35rem; }
.rel-item .rel-num {
  font-family:'JetBrains Mono', monospace;
  font-size: .75rem; color: var(--mod-c, var(--accent));
  flex-shrink: 0;
}
.rel-item .rel-name {
  font-size: .85rem; color: var(--fg);
  transition: color .18s ease;
}
.rel-item:hover .rel-name { color: var(--mod-c, var(--accent)); }

/* Footer prev / next nav */
.fw-nav {
  display:grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  padding: 2rem 0 4rem;
  border-top: 1px solid var(--line);
}
.fw-nav a {
  display:block;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(var(--surface-rgb), 0.02);
  text-decoration: none;
  transition: all .2s ease;
}
.fw-nav a:hover {
  border-color: var(--accent);
  background: rgba(var(--surface-rgb), 0.06);
}
.fw-nav .dir {
  font-family:'JetBrains Mono', monospace;
  font-size: .7rem; color: var(--fg-dim2);
  text-transform: uppercase; letter-spacing: .12em;
  margin-bottom: .35rem;
}
.fw-nav .nav-num {
  font-family:'JetBrains Mono', monospace;
  font-size: .8rem; color: var(--accent);
  margin-right: .55rem;
}
.fw-nav .nav-title {
  font-size: .98rem; color: var(--fg);
}
.fw-nav .right { text-align: right; }
@media (max-width: 640px) {
  .fw-nav { grid-template-columns: 1fr; }
  .fw-nav .right { text-align: left; }
}

/* ---- SYSTEM MAP (homepage hero diagram, simple) ---- */
.sysmap {
  display:grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  grid-template-columns: repeat(7, 1fr);
}
@media (max-width: 900px) {
  .sysmap { grid-template-columns: repeat(2, 1fr); }
}
.sysmap-cell {
  background: var(--bg-1);
  padding: 1rem .9rem;
  display:flex; flex-direction:column; gap:.35rem;
  text-decoration: none;
  transition: all .2s ease;
  position: relative;
}
.sysmap-cell:hover {
  background: var(--bg-2);
}
.sysmap-cell::after {
  content:""; position:absolute; bottom:0; left:0; right:0; height: 2px;
  background: var(--mod-c, var(--accent));
  transform: scaleX(.5); transform-origin: left;
  opacity: .5; transition: all .2s ease;
}
.sysmap-cell:hover::after { transform: scaleX(1); opacity: 1; }
.sysmap-cell .sm-num {
  font-family:'JetBrains Mono', monospace;
  font-size: .65rem;
  color: var(--mod-c, var(--accent));
  letter-spacing: .08em;
}
.sysmap-cell .sm-name {
  font-size: .85rem; font-weight: 500; color: var(--fg);
  line-height: 1.2;
}
.sysmap-cell .sm-meta {
  font-family:'JetBrains Mono', monospace;
  font-size: .62rem; color: var(--fg-dim2);
  margin-top: auto; padding-top: .35rem;
}

/* ---- KICKER (used in headers and section labels) ---- */
.kicker {
  font-family:'JetBrains Mono', monospace;
  font-size: .72rem; color: var(--fg-dim2);
  letter-spacing: .15em; text-transform: uppercase;
}
.kicker .accent { color: var(--accent); }

/* ---- TYPE TAG (类型: 方法级 / 模型级 / 工程级 / ...) ---- */
.type-tag {
  display: inline-flex; align-items: center;
  padding: .22rem .6rem;
  font-family:'JetBrains Mono', monospace;
  font-size: .65rem;
  color: var(--fg-dim);
  background: color-mix(in srgb, var(--mod-c, var(--accent)) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--mod-c, var(--accent)) 40%, var(--line));
  border-radius: 3px;
  letter-spacing: .08em;
  white-space: nowrap;
}
.type-tag::before {
  content:""; display:inline-block;
  width: 5px; height: 5px;
  background: var(--mod-c, var(--accent));
  border-radius: 50%;
  margin-right: .5rem;
}

/* ---- CORE DEFINITION (核心定义, used in glance + fw page) ---- */
.core-def-block {
  padding: 1.5rem 1.75rem;
  background: rgba(var(--surface-rgb), 0.03);
  border: 1px solid var(--line);
  border-left: 3px solid var(--mod-c, var(--accent));
  border-radius: 4px;
  margin-top: 2rem;
}
.core-def-block .label {
  font-family:'JetBrains Mono', monospace;
  font-size: .68rem; color: var(--mod-c, var(--accent));
  text-transform: uppercase; letter-spacing: .14em;
  margin-bottom: .65rem;
  display: block;
}
.core-def-block .text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--fg);
}

/* abbreviation small text within hero h1 */
.fw-hero h1 .abbr {
  display: block;
  font-family:'JetBrains Mono', monospace;
  font-weight: 400;
  font-size: .42em;
  color: var(--mod-c, var(--accent));
  letter-spacing: .04em;
  margin-top: .8rem;
  line-height: 1.4;
  opacity: .95;
}

/* =================================================================
   AMS · Visualization Components (可视化模型组件)
   ================================================================= */

/* container for any visualization */
.fw-viz {
  margin: 3rem 0 2.5rem;
  padding: 2rem 1.75rem 1.75rem;
  background: rgba(var(--surface-rgb), 0.025);
  border: 1px solid var(--line);
  border-radius: 6px;
  position: relative;
  overflow: hidden;
}
.fw-viz::before {
  content:""; position:absolute; top:0; left:0; right:0; height:2px;
  background: linear-gradient(to right, transparent, var(--mod-c), transparent);
  opacity: .6;
}

.viz-header {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem; margin-bottom: 1.5rem; flex-wrap: wrap;
}
.viz-header .left { display:flex; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.viz-label {
  font-family:'JetBrains Mono', monospace;
  font-size: .68rem;
  color: var(--mod-c);
  text-transform: uppercase;
  letter-spacing: .14em;
}
.viz-header h3 {
  font-family:'Space Grotesk', 'Inter', sans-serif;
  font-weight: 500;
  font-size: 1.1rem;
  color: var(--fg);
  margin: 0;
  letter-spacing: -.01em;
}
.viz-pattern {
  font-family:'JetBrains Mono', monospace;
  font-size: .65rem;
  color: var(--fg-dim2);
  padding: .2rem .55rem;
  border: 1px solid var(--line);
  border-radius: 3px;
}

.viz-canvas {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.viz-svg {
  width: 100%;
  height: auto;
  max-width: 720px;
  margin: 0 auto;
  display: block;
}

/* SVG text styling (themed via CSS vars) */
.viz-svg text { font-family: 'Inter', 'PingFang SC', sans-serif; }
.viz-svg .v-ring-label {
  font-family:'JetBrains Mono', monospace;
  font-size: 11px; fill: var(--mod-c);
  letter-spacing: 2px;
}
.viz-svg .v-ring-sub {
  font-size: 10.5px; fill: var(--fg-dim2);
  letter-spacing: .5px;
}
.viz-svg .v-node-title {
  font-family:'Space Grotesk', 'Inter', sans-serif;
  font-weight: 600;
  font-size: 15px;
  fill: var(--fg);
}
.viz-svg .v-node-sub {
  font-size: 11.5px;
  fill: var(--fg-dim);
}
.viz-svg .v-node-mono {
  font-family:'JetBrains Mono', monospace;
  font-size: 10px;
  fill: var(--mod-c);
  letter-spacing: .08em;
}
.viz-svg .v-node-rect {
  fill: rgba(var(--surface-rgb), 0.04);
  stroke: var(--line-2);
  stroke-width: 1;
  transition: all .25s ease;
}
.viz-svg .v-node:hover .v-node-rect {
  fill: rgba(var(--surface-rgb), 0.08);
  stroke: var(--mod-c);
}
.viz-svg .v-center {
  fill: rgba(var(--surface-rgb), 0.06);
  stroke: var(--mod-c);
  stroke-width: 2;
}
.viz-svg .v-ring {
  fill: none;
  stroke: var(--mod-c);
  stroke-width: 1.5;
  stroke-dasharray: 4 5;
  opacity: .5;
}
.viz-svg .v-connector {
  stroke: var(--mod-c);
  stroke-width: 1.5;
  opacity: .55;
}
.viz-svg .v-arrow-head {
  fill: var(--mod-c);
  opacity: .7;
}

.viz-legend {
  display: flex; gap: 1.5rem; flex-wrap: wrap;
  margin-top: 1.25rem; padding-top: 1rem;
  border-top: 1px dashed var(--line);
}
.viz-legend span {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family:'JetBrains Mono', monospace;
  font-size: .72rem; color: var(--fg-dim);
}
.viz-legend i.dot {
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--mod-c);
}
.viz-legend i.dot.ring {
  background: transparent;
  border: 1.5px dashed var(--mod-c);
}
.viz-legend i.dot.hub {
  background: var(--mod-c);
  outline: 2px solid color-mix(in srgb, var(--mod-c) 30%, transparent);
  outline-offset: 2px;
}

/* =================================================================
   AMS · Visualization Patterns (P2–P8)
   ================================================================= */

/* ----- P3 · 双轴矩阵 (HTML/CSS) ----- */
.viz-matrix {
  display: grid;
  grid-template-columns: 60px 1fr 1fr;
  grid-template-rows: 1fr 1fr 56px;
  gap: 1px;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  min-height: 420px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.viz-matrix .axis-y {
  grid-column: 1; grid-row: 1 / span 2;
  background: var(--bg-1);
  display: flex; align-items: center; justify-content: center;
  font-family:'JetBrains Mono', monospace;
  font-size: .7rem; color: var(--fg-dim2);
  writing-mode: vertical-rl; transform: rotate(180deg);
  letter-spacing: .15em; text-transform: uppercase;
  padding: 1rem 0;
  position: relative;
}
.viz-matrix .axis-y::before { content:"↑"; position:absolute; top: .8rem; color: var(--mod-c); transform: rotate(180deg); }
.viz-matrix .axis-x {
  grid-column: 2 / span 2; grid-row: 3;
  background: var(--bg-1);
  display: flex; align-items: center; justify-content: center;
  font-family:'JetBrains Mono', monospace;
  font-size: .7rem; color: var(--fg-dim2);
  letter-spacing: .15em; text-transform: uppercase;
  padding: 0 1.25rem; gap: .85rem;
  position: relative;
}
.viz-matrix .axis-x::after { content:"→"; color: var(--mod-c); }
.viz-matrix .corner {
  grid-column: 1; grid-row: 3; background: var(--bg-1);
}
.viz-matrix .quad {
  background: var(--bg-1);
  padding: 1.25rem 1.4rem;
  display: flex; flex-direction: column;
  transition: all .22s ease;
}
.viz-matrix .quad:hover {
  background: color-mix(in srgb, var(--mod-c) 6%, var(--bg-1));
}
.viz-matrix .quad-tag {
  font-family:'JetBrains Mono', monospace;
  font-size: .62rem; color: var(--mod-c);
  letter-spacing: .14em; text-transform: uppercase;
}
.viz-matrix .quad-title {
  font-family:'Space Grotesk', 'Inter', sans-serif;
  font-weight: 600; font-size: 1.2rem;
  color: var(--fg); margin: .35rem 0 .5rem; letter-spacing: -.01em;
}
.viz-matrix .quad-desc {
  font-size: .82rem; color: var(--fg-dim); line-height: 1.55;
}
.viz-matrix .quad-action {
  margin-top: auto; padding-top: .85rem;
  font-family:'JetBrains Mono', monospace;
  font-size: .68rem; color: var(--mod-c);
  letter-spacing: .05em;
  border-top: 1px dashed var(--line);
  margin-top: 1rem; padding-top: .7rem;
}

/* ----- P4 · 层级栈 (HTML/CSS) ----- */
.viz-stack {
  display: flex; flex-direction: column;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  max-width: 720px;
  margin: 0 auto;
}
.viz-stack .layer {
  background: var(--bg-1);
  padding: 1.05rem 1.4rem;
  display: grid;
  grid-template-columns: 110px 1.1fr 2fr;
  gap: 1.25rem;
  align-items: center;
  transition: all .2s ease;
  border-left: 3px solid transparent;
}
.viz-stack .layer:hover {
  background: var(--bg-2);
  border-left-color: var(--mod-c);
}
.viz-stack .layer.is-key {
  border-left-color: var(--mod-c);
  background: color-mix(in srgb, var(--mod-c) 5%, var(--bg-1));
}
.viz-stack .layer-num {
  font-family:'JetBrains Mono', monospace;
  font-size: .7rem; color: var(--mod-c);
  letter-spacing: .12em; text-transform: uppercase;
}
.viz-stack .layer-name {
  font-family:'Space Grotesk', sans-serif;
  font-weight: 500; font-size: 1.02rem; color: var(--fg);
}
.viz-stack .layer-name .en {
  font-family:'JetBrains Mono', monospace;
  font-weight: 400; font-size: .65rem;
  color: var(--fg-dim2); display: block;
  margin-top: .2rem; letter-spacing: .03em;
}
.viz-stack .layer-desc {
  font-size: .82rem; color: var(--fg-dim); line-height: 1.55;
}
@media (max-width: 640px) {
  .viz-stack .layer { grid-template-columns: 1fr; gap: .35rem; padding: .9rem 1rem; }
}

/* ----- P5 · 成熟度阶梯 (HTML/CSS) ----- */
.viz-ladder {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  max-width: 720px;
  margin: 0 auto;
  align-items: stretch;
}
.viz-ladder .step {
  background: var(--bg-1);
  padding: 1.1rem 1rem 1.4rem;
  display: flex; flex-direction: column;
  position: relative;
  transition: all .25s ease;
  min-height: 200px;
}
.viz-ladder .step:nth-child(1) { align-self: end; min-height: 130px; }
.viz-ladder .step:nth-child(2) { align-self: end; min-height: 160px; }
.viz-ladder .step:nth-child(3) { align-self: end; min-height: 190px; }
.viz-ladder .step:nth-child(4) { align-self: end; min-height: 220px; }
.viz-ladder .step:nth-child(5) { align-self: end; min-height: 250px; }
.viz-ladder .step::before {
  content:""; position: absolute; bottom: 0; left: 0; right: 0;
  height: 3px; background: var(--mod-c);
  opacity: .35;
}
.viz-ladder .step.is-critical {
  background: color-mix(in srgb, var(--mod-c) 7%, var(--bg-1));
}
.viz-ladder .step.is-critical::before { opacity: 1; height: 4px; }
.viz-ladder .step-num {
  font-family:'JetBrains Mono', monospace;
  font-size: .72rem; color: var(--mod-c);
  letter-spacing: .08em;
}
.viz-ladder .step-name {
  font-family:'Space Grotesk', sans-serif;
  font-weight: 600; font-size: .98rem;
  color: var(--fg); margin-top: .4rem;
  letter-spacing: -.01em;
}
.viz-ladder .step-desc {
  font-size: .76rem; color: var(--fg-dim);
  line-height: 1.5; margin-top: .55rem;
}
.viz-ladder .step-flag {
  margin-top: auto; padding-top: .65rem;
  font-family:'JetBrains Mono', monospace;
  font-size: .62rem; color: var(--mod-c);
  letter-spacing: .08em;
}
@media (max-width: 760px) {
  .viz-ladder { grid-template-columns: 1fr; }
  .viz-ladder .step:nth-child(n) { min-height: auto; padding-bottom: 1rem; }
  .viz-ladder .step::before { display: none; }
}

/* ----- P7 · 链路流程 (HTML/CSS) ----- */
.viz-flow {
  display: flex;
  align-items: stretch;
  gap: 1.4rem;
  max-width: 720px;
  margin: 0 auto;
  flex-wrap: wrap;
}
.viz-flow .step {
  flex: 1 1 130px;
  background: rgba(var(--surface-rgb), 0.03);
  border: 1px solid var(--line);
  border-top: 3px solid var(--mod-c);
  border-radius: 4px;
  padding: 1rem 1rem 1.2rem;
  position: relative;
  transition: all .2s ease;
}
.viz-flow .step:hover {
  background: rgba(var(--surface-rgb), 0.07);
  border-color: var(--mod-c);
}
.viz-flow .step:not(:last-child)::after {
  content:"→"; position: absolute;
  right: -1.2rem; top: 50%;
  transform: translateY(-50%);
  font-family:'JetBrains Mono', monospace;
  color: var(--mod-c);
  font-size: 1rem;
  z-index: 2;
  width: 1rem; text-align: center;
}
.viz-flow .step-num {
  font-family:'JetBrains Mono', monospace;
  font-size: .65rem; color: var(--mod-c);
  letter-spacing: .14em; text-transform: uppercase;
}
.viz-flow .step-name {
  font-family:'Space Grotesk', sans-serif;
  font-weight: 600; font-size: .98rem;
  color: var(--fg); margin: .45rem 0 .35rem;
  letter-spacing: -.01em;
}
.viz-flow .step-en {
  font-family:'JetBrains Mono', monospace;
  font-size: .62rem; color: var(--fg-dim2);
  letter-spacing: .02em; margin-bottom: .65rem;
}
.viz-flow .step-fail {
  font-size: .75rem; color: var(--fg-dim);
  line-height: 1.55;
}
@media (max-width: 720px) {
  .viz-flow { flex-direction: column; gap: 2.2rem; }
  .viz-flow .step:not(:last-child)::after {
    content:"↓"; right: 50%; top: auto; bottom: -1.6rem;
    transform: translateX(50%);
  }
}

/* ----- SVG helpers for P2 radar, P6 loop, P8 concentric ----- */
.viz-svg .v-axis        { stroke: var(--line-2); stroke-width: 1; opacity: .7; }
.viz-svg .v-axis-grid   { stroke: var(--line); stroke-width: 1; fill: none; opacity: .55; }
.viz-svg .v-polygon     {
  fill: color-mix(in srgb, var(--mod-c) 18%, transparent);
  stroke: var(--mod-c);
  stroke-width: 2;
}
.viz-svg .v-dot         { fill: var(--mod-c); }
.viz-svg .v-dot.special { fill: var(--bg); stroke: var(--mod-c); stroke-width: 2.5; }
.viz-svg .v-axis-label  {
  font-family:'JetBrains Mono', monospace;
  font-size: 11px;
  fill: var(--mod-c);
  letter-spacing: .08em;
}
.viz-svg .v-axis-name   {
  font-family:'Inter', 'PingFang SC', sans-serif;
  font-size: 11.5px;
  fill: var(--fg);
}
.viz-svg .v-loop-node circle.bg {
  fill: rgba(var(--surface-rgb), 0.04);
  stroke: var(--line-2);
  stroke-width: 1.5;
  transition: all .2s ease;
}
.viz-svg .v-loop-node:hover circle.bg {
  fill: rgba(var(--surface-rgb), 0.08);
  stroke: var(--mod-c);
}
.viz-svg .v-loop-arc {
  fill: none;
  stroke: var(--mod-c);
  stroke-width: 1.5;
  opacity: .55;
}
.viz-svg .v-concentric {
  fill: rgba(var(--surface-rgb), 0.025);
  stroke: var(--mod-c);
  stroke-width: 1.5;
}
.viz-svg .v-concentric-inner { fill: color-mix(in srgb, var(--mod-c) 10%, transparent); }

/* ----- P1.b · 五力放射图 (HTML/CSS 版本) ----- */
.vh-radial {
  position: relative;
  width: 100%;
  max-width: 620px;
  aspect-ratio: 1.1 / 1;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 200px 1fr;
  grid-template-rows: 90px 200px 90px;
  align-items: center;
  justify-items: center;
  padding: 30px 0;
}
.vh-radial::before {
  content:""; position:absolute;
  inset: 8% 13%;
  border: 1.5px dashed var(--mod-c);
  border-radius: 50%;
  opacity: 0.5;
  pointer-events: none;
}
.vh-ring-label {
  position: absolute; top: 0; left: 50%;
  transform: translateX(-50%);
  background: var(--bg-1);
  padding: 0 1rem;
  text-align: center; z-index: 3;
}
.vh-ring-label .top {
  display: block;
  font-family:'JetBrains Mono', monospace;
  font-size: 11px; color: var(--mod-c);
  letter-spacing: 2px; text-transform: uppercase;
}
.vh-ring-label .sub {
  display: block;
  font-size: 10.5px; color: var(--fg-dim2);
  margin-top: 3px; letter-spacing: .5px;
}
.vh-radial .vh-force {
  width: 180px; padding: .6rem .85rem;
  background: rgba(var(--surface-rgb), 0.04);
  border: 1px solid var(--line-2);
  border-radius: 4px; text-align: center;
  z-index: 2; transition: all .2s ease;
}
.vh-radial .vh-force:hover {
  border-color: var(--mod-c);
  background: rgba(var(--surface-rgb), 0.08);
}
.vh-radial .vh-tag {
  font-family:'JetBrains Mono', monospace;
  font-size: 10px; color: var(--mod-c);
  letter-spacing: .08em;
}
.vh-radial .vh-title {
  font-family:'Space Grotesk', sans-serif;
  font-weight: 600; font-size: 15px;
  margin: .3rem 0 .15rem; color: var(--fg);
}
.vh-radial .vh-sub {
  font-size: 11px; color: var(--fg-dim);
}
.vh-radial .vh-top    { grid-column: 2; grid-row: 1; }
.vh-radial .vh-bottom { grid-column: 2; grid-row: 3; }
.vh-radial .vh-left   { grid-column: 1; grid-row: 2; }
.vh-radial .vh-right  { grid-column: 3; grid-row: 2; }

.vh-radial .vh-center {
  grid-column: 2; grid-row: 2;
  width: 160px; height: 160px;
  border-radius: 50%;
  background: rgba(var(--surface-rgb), 0.06);
  border: 2px solid var(--mod-c);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center;
  z-index: 3;
  padding: 0 .5rem;
}

/* arrows from forces toward center */
.vh-radial .vh-arrow {
  position: absolute;
  background: var(--mod-c);
  opacity: .55;
  z-index: 1;
}
.vh-radial .vh-arrow-top {
  width: 1.5px; height: 38px;
  left: 50%; top: 30%;
  transform: translateX(-50%);
}
.vh-radial .vh-arrow-top::after {
  content:""; position: absolute;
  bottom: -1px; left: 50%; transform: translateX(-50%);
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 6px solid var(--mod-c);
}
.vh-radial .vh-arrow-bottom {
  width: 1.5px; height: 38px;
  left: 50%; bottom: 30%;
  transform: translateX(-50%);
}
.vh-radial .vh-arrow-bottom::after {
  content:""; position: absolute;
  top: -1px; left: 50%; transform: translateX(-50%);
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 6px solid var(--mod-c);
}
.vh-radial .vh-arrow-left {
  width: 38px; height: 1.5px;
  top: 50%; left: 30%;
  transform: translateY(-50%);
}
.vh-radial .vh-arrow-left::after {
  content:""; position: absolute;
  right: -1px; top: 50%; transform: translateY(-50%);
  width: 0; height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid var(--mod-c);
}
.vh-radial .vh-arrow-right {
  width: 38px; height: 1.5px;
  top: 50%; right: 30%;
  transform: translateY(-50%);
}
.vh-radial .vh-arrow-right::after {
  content:""; position: absolute;
  left: -1px; top: 50%; transform: translateY(-50%);
  width: 0; height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-right: 6px solid var(--mod-c);
}

/* ---------- 回到顶部按钮 ---------- */
.back-to-top {
  position: fixed;
  right: 1.75rem;
  bottom: 1.75rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-1);
  border: 1px solid var(--line);
  color: var(--fg-dim);
  border-radius: 999px;
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease, background .15s ease, color .15s ease, border-color .15s ease;
  z-index: 60;
  backdrop-filter: blur(8px);
}
.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}
.back-to-top svg {
  width: 18px;
  height: 18px;
}
@media (max-width: 640px) {
  .back-to-top { right: 1rem; bottom: 1rem; width: 40px; height: 40px; }
}

/* ================================================================
   FRAMEWORK PAGE TABS  ·  long-form / method / theory  three views
   ================================================================ */
.fw-tabs {
  display: flex;
  gap: 4px;
  margin: 0 0 36px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--bg-1) 92%, transparent);
  position: sticky;
  top: 76px;
  z-index: 20;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.fw-tab {
  flex: 1;
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  font-size: 14.5px;
  font-weight: 500;
  background: transparent;
  border: none;
  color: var(--fg-dim);
  cursor: pointer;
  transition: color .18s ease, background .18s ease, transform .18s ease;
  border-radius: 8px;
  letter-spacing: 0.01em;
  font-family: inherit;
}
.fw-tab:hover { color: var(--fg); background: var(--bg-2); }
.fw-tab .tab-icon { font-size: 16px; line-height: 1; transform: translateY(1px); }
.fw-tab .tab-label { font-weight: 500; }
.fw-tab .tab-sub {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10.5px;
  color: var(--fg-dim2);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.fw-tab.is-active {
  background: var(--accent);
  color: var(--accent-fg);
}
.fw-tab.is-active .tab-sub { color: rgba(255,255,255,0.65); }
.fw-tab:focus-visible {
  outline: 2px solid var(--accent-hi);
  outline-offset: 2px;
}

.tab-panel { animation: tab-fade-in .35s ease both; }
.tab-panel[hidden] { display: none !important; }
@keyframes tab-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.tab-intro {
  margin: 0 0 26px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: color-mix(in srgb, var(--bg-1) 60%, transparent);
}
.tab-intro-label {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.tab-intro p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--fg-dim);
}
.tab-intro strong { color: var(--fg); font-weight: 500; }

/* method panel ---------------------------------------------------- */
.method-steps,
.method-caveats,
.method-checks {
  list-style: none;
  padding: 0;
  margin: 1.2rem 0 1.6rem;
}
.method-steps li {
  padding: 14px 0;
  border-top: 1px dashed var(--line);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--fg-dim);
}
.method-steps li:first-child { border-top: 0; padding-top: 4px; }
.method-steps li strong {
  color: var(--accent);
  font-weight: 600;
  margin-right: 6px;
}
.method-caveats li {
  padding: 14px 18px;
  background: color-mix(in srgb, var(--bg-1) 75%, transparent);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--fg-dim);
}
.method-caveats li strong {
  color: var(--accent-hi);
  font-weight: 500;
}
.method-checks li {
  padding: 10px 0;
  font-size: 15px;
  color: var(--fg-dim);
  line-height: 1.7;
}

/* theory panel ---------------------------------------------------- */
.theory-citations {
  display: grid;
  gap: 14px;
  margin: 1.4rem 0 1.8rem;
}
.cit-item {
  padding: 20px 22px;
  background: color-mix(in srgb, var(--bg-1) 80%, transparent);
  border: 1px solid var(--line);
  border-radius: 10px;
  transition: border-color .18s ease;
}
.cit-item:hover { border-color: var(--line-2); }
.cit-item .cit-author {
  font-size: 17px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}
.cit-item .cit-work {
  font-size: 12.5px;
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  color: var(--fg-dim2);
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}
.cit-item .cit-work em { font-style: italic; color: var(--fg-dim); }
.cit-item .cit-concept {
  font-size: 14px;
  color: var(--fg-dim);
  margin-bottom: 10px;
}
.cit-item .cit-concept strong {
  color: var(--accent-hi);
  font-weight: 500;
}
.cit-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--fg-dim);
}

.theory-shifts,
.theory-rels,
.theory-reading {
  list-style: none;
  padding: 0;
  margin: 1.2rem 0 1.6rem;
}
.theory-shifts li,
.theory-rels li,
.theory-reading li {
  padding: 13px 0;
  border-top: 1px dashed var(--line);
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-dim);
}
.theory-shifts li:first-child,
.theory-rels li:first-child,
.theory-reading li:first-child { border-top: 0; padding-top: 4px; }
.theory-shifts li strong,
.theory-rels li strong { color: var(--fg); font-weight: 500; margin-right: 6px; }
.theory-reading li em { color: var(--fg-dim); font-style: italic; }

/* responsive: tighter tabs on mobile */
@media (max-width: 640px) {
  .fw-tabs { gap: 2px; padding: 4px; }
  .fw-tab { padding: 9px 8px; font-size: 13px; gap: 5px; }
  .fw-tab .tab-sub { display: none; }
  .tab-intro { padding: 14px 16px; }
  .cit-item { padding: 16px 18px; }
}

/* ================================================================
   HOMEPAGE HERO  ·  BLUEPRINT PREVIEW   6×5 + Governance
   ================================================================ */
.blueprint-preview {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px;
  background: color-mix(in srgb, var(--bg-1) 70%, transparent);
}
.bp-header {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 22px;
}
.bp-eyebrow {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-dim2);
  margin-bottom: 6px;
}
.bp-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--fg);
  font-family: var(--font-display, "Space Grotesk", sans-serif);
  letter-spacing: 0.005em;
}
.bp-subtitle {
  margin-top: 4px;
  font-size: 13px;
  color: var(--fg-dim);
}
.bp-cta {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  padding: 7px 14px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  transition: all .18s ease;
  white-space: nowrap;
}
.bp-cta:hover {
  background: var(--accent);
  color: var(--accent-fg);
}
.bp-cta .arr { margin-left: 4px; }

.bp-grid {
  display: grid;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg);
}
.bp-row {
  display: grid;
  grid-template-columns: 180px repeat(5, 1fr);
  border-top: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background .18s ease;
}
.bp-row:first-child { border-top: 0; }
.bp-row-head {
  background: color-mix(in srgb, var(--bg-1) 80%, transparent);
}
.bp-row-link:hover {
  background: color-mix(in srgb, var(--accent) 6%, var(--bg));
}
.bp-row-link:hover .bp-mod-name { color: var(--accent); }
.bp-row-link:hover .bp-cell { color: var(--fg); }

.bp-rowlabel {
  padding: 16px 16px;
  font-size: 14.5px;
  color: var(--fg);
  background: color-mix(in srgb, var(--bg-1) 60%, transparent);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
}
.bp-rowlabel.bp-corner {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  color: var(--fg-dim2);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.bp-mod-num {
  color: var(--accent);
  font-weight: 600;
  font-size: 15px;
  margin-right: 2px;
}
.bp-mod-name {
  font-weight: 500;
  font-size: 15px;
  color: var(--fg);
  transition: color .18s ease;
}
.bp-mod-range {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10px;
  color: var(--fg-dim2);
  letter-spacing: 0.12em;
}

.bp-cell {
  padding: 14px 8px;
  font-size: 12.5px;
  color: var(--fg-dim);
  text-align: center;
  border-left: 1px solid var(--line);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.35;
  letter-spacing: 0.01em;
  transition: color .18s ease, background .18s ease;
  gap: 3px;
}
.bp-cell .bp-cell-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg);
  line-height: 1.25;
}
.bp-cell .bp-cell-sub {
  font-size: 10.5px;
  color: var(--fg-dim2);
  line-height: 1.3;
  letter-spacing: 0.005em;
}
.bp-cell-head {
  padding: 12px 8px;
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  text-align: center;
  color: var(--fg-dim);
  background: color-mix(in srgb, var(--bg-1) 40%, transparent);
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.bp-cell-head .stage-tag {
  color: var(--accent);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.06em;
}
.bp-cell-head .stage-name {
  font-family: var(--font-sans, Inter, sans-serif);
  font-size: 11.5px;
  color: var(--fg-dim2);
  letter-spacing: 0.05em;
}
/* multi-color stage tinting (matches blueprint.html palette) */
.bp-cell.bp-st-1 { background: color-mix(in srgb, var(--bp-c1) 9%,  var(--bg)); }
.bp-cell.bp-st-2 { background: color-mix(in srgb, var(--bp-c2) 9%,  var(--bg)); }
.bp-cell.bp-st-3 { background: color-mix(in srgb, var(--bp-c3) 10%, var(--bg)); }
.bp-cell.bp-st-4 { background: color-mix(in srgb, var(--bp-c4) 12%, var(--bg)); }
.bp-cell.bp-st-5 { background: color-mix(in srgb, var(--bp-c5) 16%, var(--bg)); }
.bp-row-link:hover .bp-cell.bp-st-1 { background: color-mix(in srgb, var(--bp-c1) 18%, var(--bg)); }
.bp-row-link:hover .bp-cell.bp-st-2 { background: color-mix(in srgb, var(--bp-c2) 18%, var(--bg)); }
.bp-row-link:hover .bp-cell.bp-st-3 { background: color-mix(in srgb, var(--bp-c3) 20%, var(--bg)); }
.bp-row-link:hover .bp-cell.bp-st-4 { background: color-mix(in srgb, var(--bp-c4) 22%, var(--bg)); }
.bp-row-link:hover .bp-cell.bp-st-5 { background: color-mix(in srgb, var(--bp-c5) 26%, var(--bg)); }
/* small stage-color hint on column headers */
.bp-cell-head .stage-tag { color: var(--accent); }

.bp-governance {
  margin-top: 18px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: color-mix(in srgb, var(--bg-1) 50%, transparent);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}
.bp-gov-label {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11.5px;
  color: var(--fg-dim2);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.bp-gov-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  flex: 1;
}
.bp-gov-item {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  font-size: 13px;
  color: var(--fg-dim);
  text-decoration: none;
  transition: all .18s ease;
}
.bp-gov-item:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 5%, var(--bg));
}
.bp-gov-icon {
  color: var(--accent);
  font-size: 14px;
}
.bp-gov-name { color: var(--fg); font-weight: 500; }
.bp-gov-en {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10.5px;
  color: var(--fg-dim2);
  letter-spacing: 0.08em;
}

/* ---- blueprint responsive ---- */
@media (max-width: 900px) {
  .blueprint-preview { padding: 18px; }
  .bp-row { grid-template-columns: 140px repeat(5, 1fr); }
  .bp-rowlabel { padding: 12px 10px; font-size: 13px; }
  .bp-cell { padding: 12px 4px; font-size: 11.5px; }
  .bp-cell-head { padding: 9px 4px; }
  .bp-cell-head .stage-name { font-size: 10px; }
}
@media (max-width: 640px) {
  .bp-header { flex-direction: column; align-items: flex-start; }
  .bp-cta { align-self: stretch; text-align: center; }
  .bp-row { grid-template-columns: 110px repeat(5, 1fr); }
  .bp-rowlabel { padding: 10px 8px; font-size: 12px; }
  .bp-mod-name { font-size: 13px; }
  .bp-mod-range { font-size: 9px; }
  .bp-cell { padding: 10px 2px; font-size: 10.5px; }
  .bp-governance { flex-direction: column; align-items: stretch; padding: 14px; }
  .bp-gov-list { flex-direction: column; }
  .bp-gov-item { justify-content: center; }
}

/* ================================================================
   SKILL LIBRARY  ·  /skills/index.html
   ================================================================ */
.inline-code {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.88em;
  padding: 1px 6px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--accent);
}

.usage-card {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: color-mix(in srgb, var(--bg-1) 70%, transparent);
}
.usage-num {
  display: inline-block;
  font-family: var(--font-display, "Space Grotesk", sans-serif);
  font-size: 22px;
  color: var(--accent);
  font-weight: 600;
  line-height: 1;
}
.usage-title {
  margin-top: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--fg);
}
.usage-text {
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--fg-dim);
  line-height: 1.55;
}

/* Filter bar */
.sk-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.filter-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg);
  color: var(--fg-dim);
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: all .18s ease;
}
.filter-pill:hover { color: var(--fg); border-color: var(--line-2); }
.filter-pill.is-active {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
}
.filter-pill .dot {
  width: 8px; height: 8px; border-radius: 50%;
  display: inline-block;
}
.filter-pill .cnt {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  opacity: 0.75;
  margin-left: 4px;
}

/* Skill card grid */
.sk-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.sk-card {
  display: flex;
  flex-direction: column;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--bg-1) 60%, transparent);
  transition: border-color .18s ease, transform .18s ease;
}
.sk-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.sk-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}
.sk-id {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.1em;
  font-weight: 600;
}
.sk-type {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10.5px;
  color: var(--fg-dim2);
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
}
.sk-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--fg);
  margin: 0 0 4px;
  font-family: var(--font-display, "Space Grotesk", sans-serif);
  letter-spacing: 0.005em;
}
.sk-subtitle {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  color: var(--fg-dim2);
  letter-spacing: 0.03em;
  line-height: 1.45;
  margin-bottom: 10px;
}
.sk-abbr {
  color: var(--accent);
  font-weight: 600;
}
.sk-mod {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  color: var(--fg-dim2);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}
.sk-mod-dot {
  width: 8px; height: 8px; border-radius: 50%;
}
.sk-desc {
  font-size: 13.5px;
  color: var(--fg-dim);
  line-height: 1.65;
  margin: 0 0 12px;
  flex: 1;
}
.sk-triggers {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 14px;
}
.trig-chip {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10.5px;
  color: var(--fg-dim);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 2px 7px;
  letter-spacing: 0.02em;
}
.sk-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}
.sk-link, .sk-download {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 5px;
  transition: all .18s ease;
}
.sk-link {
  color: var(--fg-dim);
}
.sk-link:hover { color: var(--accent); }
.sk-download {
  color: var(--accent);
  border: 1px solid var(--accent);
}
.sk-download:hover {
  background: var(--accent);
  color: var(--accent-fg);
}

@media (max-width: 640px) {
  .sk-grid { grid-template-columns: 1fr; gap: 12px; }
  .sk-card { padding: 16px 18px; }
}

/* Preview button + 3-button action row */
.sk-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  flex-wrap: wrap;
}
.sk-preview {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  font-weight: 500;
  padding: 6px 12px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-fg);
  border-radius: 5px;
  cursor: pointer;
  transition: all .18s ease;
}
.sk-preview:hover {
  background: var(--accent-hi);
  border-color: var(--accent-hi);
}
.sk-preview:focus-visible {
  outline: 2px solid var(--accent-hi);
  outline-offset: 2px;
}

/* ================================================================
   MD PREVIEW MODAL
   ================================================================ */
.md-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.md-modal[hidden] { display: none; }
.md-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  cursor: pointer;
}
.md-modal-card {
  position: relative;
  width: 100%;
  max-width: 920px;
  max-height: 88vh;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.md-modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-1) 70%, transparent);
}
.md-modal-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.md-modal-id {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border: 1px solid var(--accent);
  border-radius: 5px;
}
.md-modal-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--fg);
  font-family: var(--font-display, "Space Grotesk", sans-serif);
}
.md-modal-close {
  width: 32px;
  height: 32px;
  font-size: 20px;
  line-height: 1;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--fg-dim);
  border-radius: 6px;
  cursor: pointer;
  transition: all .18s ease;
}
.md-modal-close:hover {
  color: var(--fg);
  border-color: var(--line-2);
  background: var(--bg-2);
}
.md-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 28px 32px;
  color: var(--fg-dim);
  scroll-behavior: smooth;
}
.md-modal-body::-webkit-scrollbar { width: 8px; }
.md-modal-body::-webkit-scrollbar-thumb { background: var(--line-2); border-radius: 4px; }
.md-modal-loading {
  padding: 60px 0;
  text-align: center;
  color: var(--fg-dim2);
  font-family: var(--font-mono, "JetBrains Mono", monospace);
}
.md-modal-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-1) 70%, transparent);
  font-size: 13px;
}
.md-modal-info {
  color: var(--fg-dim);
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* Markdown body typography */
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  color: var(--fg);
  font-family: var(--font-display, "Space Grotesk", sans-serif);
  font-weight: 600;
  line-height: 1.3;
  margin-top: 1.6em;
  margin-bottom: 0.6em;
}
.markdown-body h1 { font-size: 26px; }
.markdown-body h2 {
  font-size: 21px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.markdown-body h3 { font-size: 17px; color: var(--accent); }
.markdown-body h4 { font-size: 15px; }
.markdown-body p {
  margin: 0.9em 0;
  line-height: 1.75;
  font-size: 14.5px;
}
.markdown-body strong { color: var(--fg); font-weight: 500; }
.markdown-body em { color: var(--fg-dim2); font-style: normal; }
.markdown-body code {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.88em;
  padding: 1px 6px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--accent);
}
.markdown-body pre {
  background: var(--bg-1);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 1.2em 0;
  font-size: 13px;
  line-height: 1.6;
}
.markdown-body pre code {
  padding: 0;
  background: none;
  border: 0;
  color: var(--fg);
}
.markdown-body ul, .markdown-body ol {
  padding-left: 1.6em;
  margin: 0.9em 0;
}
.markdown-body li {
  margin: 0.3em 0;
  line-height: 1.75;
  font-size: 14.5px;
}
.markdown-body blockquote {
  margin: 1.2em 0;
  padding: 12px 18px;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 5%, transparent);
  color: var(--fg-dim);
  border-radius: 0 6px 6px 0;
}
.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2em 0;
}
.markdown-body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
}
.markdown-body a:hover { text-decoration-color: var(--accent); }
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2em 0;
  font-size: 13.5px;
}
.markdown-body th, .markdown-body td {
  padding: 8px 12px;
  border: 1px solid var(--line);
  text-align: left;
}
.markdown-body th {
  background: var(--bg-1);
  color: var(--fg);
  font-weight: 600;
}

@media (max-width: 640px) {
  .md-modal { padding: 12px; }
  .md-modal-card { max-height: 92vh; }
  .md-modal-head, .md-modal-foot { padding: 12px 16px; }
  .md-modal-body { padding: 20px; }
  .md-modal-title { font-size: 14px; }
  .md-modal-info { display: none; }
}

/* ================================================================
   KNOWLEDGE-GRAPH MODULES  ·  shared by /knowledge-map.html and #system
   ================================================================ */
/* km-stream: one-line module summary with progression "看世界 → 看优势 → …" */
.km-stream {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.km-stream-row {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 0.9rem;
  align-items: center;
  padding: 0.4rem 0;
}
.km-stream-tag {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.7rem;
  color: var(--mod-c, var(--accent));
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.km-stream-text {
  font-size: 0.9rem;
  color: var(--fg);
  line-height: 1.6;
}
.km-stream-text strong { color: var(--mod-c, var(--accent)); font-weight: 600; }

/* km-grid: 6 module columns with framework nodes */
.km-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
@media (max-width: 1100px) { .km-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 720px)  { .km-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px)  { .km-grid { grid-template-columns: 1fr; } }

.km-col {
  background: var(--bg-1);
  padding: 1rem 0.85rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  border-top: 3px solid var(--mod-c, var(--accent));
}
.km-col-head { margin-bottom: 0.35rem; }
.km-col-num {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.66rem;
  color: var(--mod-c, var(--accent));
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.km-col-name {
  font-family: var(--font-display, "Space Grotesk", sans-serif);
  font-weight: 500;
  font-size: 1rem;
  color: var(--fg);
  margin-top: 0.25rem;
  letter-spacing: -0.01em;
}
.km-col-count {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.64rem;
  color: var(--fg-dim2);
  margin-top: 0.15rem;
}
.km-node {
  display: block;
  padding: 0.55rem 0.65rem;
  background: color-mix(in srgb, var(--mod-c, var(--accent)) 3%, transparent);
  border: 1px solid var(--line);
  border-left: 2px solid var(--mod-c, var(--accent));
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.18s ease;
}
.km-node:hover {
  background: color-mix(in srgb, var(--mod-c, var(--accent)) 8%, var(--bg-1));
  border-color: var(--mod-c, var(--accent));
  transform: translateX(2px);
}
.km-node-num {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.7rem;
  color: var(--mod-c, var(--accent));
  letter-spacing: 0.04em;
}
.km-node-name {
  font-size: 0.82rem;
  color: var(--fg);
  margin-top: 0.18rem;
  line-height: 1.35;
  font-weight: 500;
}
.km-node-abbr {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.6rem;
  color: var(--fg-dim2);
  margin-top: 0.15rem;
}

/* km-governance-wrap: 治理神经 横切层 */
.km-governance-wrap {
  margin-top: 1.25rem;
  border: 1px dashed var(--accent);
  background: color-mix(in srgb, var(--accent) 3%, transparent);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
}
.km-governance-wrap::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
  opacity: 0.65;
}
.km-cross-label {
  text-align: center;
  padding: 0.95rem 1rem 0.6rem;
  border-bottom: 1px dashed var(--line);
  background: color-mix(in srgb, var(--accent) 2%, transparent);
}
.km-cross-label .tag {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 0.65rem;
  color: var(--accent);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.km-cross-label .name {
  font-family: var(--font-display, "Space Grotesk", sans-serif);
  font-weight: 500;
  font-size: 1.08rem;
  color: var(--fg);
  margin-top: 0.3rem;
  letter-spacing: -0.01em;
}
.km-cross-label .desc {
  font-size: 0.82rem;
  color: var(--fg-dim);
  margin-top: 0.4rem;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}
.km-cross-nodes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
}
@media (max-width: 720px) { .km-cross-nodes { grid-template-columns: 1fr; } }
.km-cross-nodes .km-node {
  border-radius: 0;
  border: none;
  border-left: 3px solid #B5B5B5;
  background: var(--bg-1);
  padding: 1rem 1.1rem;
}
.km-cross-nodes .km-node:hover {
  background: color-mix(in srgb, var(--accent) 5%, var(--bg-1));
  border-left-color: var(--accent);
  transform: none;
}

/* ================================================================
   FULL BLUEPRINT PAGE  ·  blueprint.html
   ================================================================ */
/* Stage color tokens (used by both hero preview & full blueprint)
   harmonized with module palette: softer, more pastel — matches the rest of the site */
:root {
  --bp-c1: #94A3B8;  /* L1 slate-gray · Tool · 中性起点 */
  --bp-c2: #FFB85B;  /* L2 warm orange · Workflow · 同模块三 */
  --bp-c3: #5BB5FF;  /* L3 sky blue · System · 同模块四 */
  --bp-c4: #5BE5A0;  /* L4 mint green · Network · 同模块二 */
  --bp-c5: #8B5CFF;  /* L5 purple · Self-evolving · 站点 accent */
}

/* 5-stage legend cards (top of blueprint.html) */
.bp-stage-legend {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px;
  background: color-mix(in srgb, var(--bg-1) 60%, transparent);
}
.bp-legend-label {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-dim2);
  margin-bottom: 14px;
}
.bp-stage-cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.bp-stage-card {
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg);
  border-left: 4px solid currentColor;
}
.bp-stage-card.bp-st-1 { color: var(--bp-c1); }
.bp-stage-card.bp-st-2 { color: var(--bp-c2); }
.bp-stage-card.bp-st-3 { color: var(--bp-c3); }
.bp-stage-card.bp-st-4 { color: var(--bp-c4); }
.bp-stage-card.bp-st-5 { color: var(--bp-c5); }
.bp-st-num {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}
.bp-st-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 2px;
}
.bp-st-en {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10.5px;
  color: var(--fg-dim2);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.bp-st-desc {
  font-size: 12.5px;
  color: var(--fg-dim);
  line-height: 1.55;
}

/* Full matrix */
.bp-full-matrix {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg);
}
.bpf-row {
  display: grid;
  grid-template-columns: 200px repeat(5, 1fr);
  border-top: 1px solid var(--line);
}
.bpf-row:first-child { border-top: 0; }
.bpf-row-head { background: color-mix(in srgb, var(--bg-1) 80%, transparent); }
.bpf-row-feature { background: color-mix(in srgb, var(--bg-1) 50%, transparent); }

.bpf-cell-side {
  padding: 18px 18px;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg-1) 70%, transparent);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  transition: background .18s ease;
}
.bpf-cell-side:hover {
  background: color-mix(in srgb, var(--accent) 8%, var(--bg-1));
}
.bpf-cell-side:hover .bpf-mod-name { color: var(--accent); }
.bpf-mod-num {
  color: var(--accent);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 2px;
}
.bpf-mod-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  transition: color .18s ease;
}
.bpf-mod-q {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
  margin-top: 2px;
}
.bpf-mod-range {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10px;
  color: var(--fg-dim2);
  letter-spacing: 0.12em;
  margin-top: 4px;
}
.bpf-side-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 2px;
}
.bpf-side-sub {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10.5px;
  color: var(--fg-dim2);
  letter-spacing: 0.06em;
}
.bpf-side-feature .bpf-side-title { color: var(--accent); }

.bpf-cell-head {
  padding: 14px 12px;
  border-left: 1px solid var(--line);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.bpf-head-tag {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 2px 10px;
  border-radius: 4px;
  background: rgba(0,0,0,0.25);
  color: var(--fg);
}
.bpf-head-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
}
.bpf-head-en {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10px;
  color: var(--fg-dim2);
  letter-spacing: 0.05em;
}

.bpf-cell {
  position: relative;
  padding: 18px 12px 28px;
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  transition: background .18s ease;
}
.bpf-cell:hover .bpf-cell-title { color: var(--accent); }
.bpf-cell:hover .bpf-cell-fw {
  opacity: 1;
  color: var(--accent);
  border-color: var(--accent);
}
.bpf-cell-fw {
  position: absolute;
  right: 8px;
  bottom: 7px;
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 9.5px;
  font-weight: 600;
  color: var(--fg-dim2);
  letter-spacing: 0.1em;
  padding: 2px 6px;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  opacity: 0.6;
  transition: all .18s ease;
}
.bpf-cell-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 4px;
  line-height: 1.3;
  transition: color .18s ease;
}
.bpf-cell-line {
  font-size: 11.5px;
  color: var(--fg-dim);
  line-height: 1.45;
  letter-spacing: 0.01em;
}

/* Stage color tinting (cells, column heads, etc.) */
.bp-st-1 { --st: var(--bp-c1); }
.bp-st-2 { --st: var(--bp-c2); }
.bp-st-3 { --st: var(--bp-c3); }
.bp-st-4 { --st: var(--bp-c4); }
.bp-st-5 { --st: var(--bp-c5); }
.bpf-cell-head.bp-st-1, .bpf-cell-head.bp-st-2, .bpf-cell-head.bp-st-3,
.bpf-cell-head.bp-st-4, .bpf-cell-head.bp-st-5 {
  background: color-mix(in srgb, var(--st) 12%, var(--bg-1));
  border-top: 2px solid var(--st);
}
.bpf-cell.bp-st-1, .bpf-cell.bp-st-2, .bpf-cell.bp-st-3,
.bpf-cell.bp-st-4, .bpf-cell.bp-st-5 {
  background: color-mix(in srgb, var(--st) 3%, var(--bg));
}
.bpf-cell.bp-st-1:hover, .bpf-cell.bp-st-2:hover, .bpf-cell.bp-st-3:hover,
.bpf-cell.bp-st-4:hover, .bpf-cell.bp-st-5:hover {
  background: color-mix(in srgb, var(--st) 8%, var(--bg));
}

.bpf-feature {
  padding: 14px 12px;
  border-left: 1px solid var(--line);
  border-top: 2px dashed var(--line);
  text-align: center;
  background: color-mix(in srgb, var(--st) 4%, var(--bg-1));
}
.bpf-feature-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--st);
  margin-bottom: 3px;
}
.bpf-feature-line {
  font-size: 11.5px;
  color: var(--fg-dim);
  line-height: 1.4;
}

/* Governance block */
.bpf-gov-block {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--bg-1) 60%, transparent);
  overflow: hidden;
}
.bpf-gov-header {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0;
}
.bpf-gov-side {
  padding: 22px 18px;
  background: color-mix(in srgb, var(--accent) 12%, var(--bg-1));
  border-right: 1px solid var(--line);
}
.bpf-gov-corner-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}
.bpf-gov-corner-sub {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10.5px;
  color: var(--fg-dim2);
  letter-spacing: 0.08em;
}
.bpf-gov-intro {
  padding: 22px 24px;
  font-size: 15px;
  color: var(--fg-dim);
  line-height: 1.75;
  display: flex;
  align-items: center;
}
.bpf-gov-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
}
.bpf-gov-card {
  padding: 22px 20px;
  border-left: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background .18s ease;
}
.bpf-gov-card:first-child { border-left: 0; }
.bpf-gov-card:hover {
  background: color-mix(in srgb, var(--accent) 6%, var(--bg));
}
.bpf-gov-icon {
  font-size: 26px;
  color: var(--accent);
  margin-bottom: 6px;
  line-height: 1;
}
.bpf-gov-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 3px;
}
.bpf-gov-en {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  color: var(--fg-dim2);
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}
.bpf-gov-sub {
  font-size: 13.5px;
  color: var(--fg-dim);
  margin-bottom: 10px;
  font-style: italic;
}
.bpf-gov-points {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.bpf-gov-points li {
  font-size: 12px;
  color: var(--fg);
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
}

/* Goal statement */
.bpf-goal {
  display: flex;
  gap: 18px;
  padding: 24px 26px;
  border: 1px solid var(--accent);
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-1));
}
.bpf-goal-icon {
  font-size: 30px;
  color: var(--accent);
  line-height: 1;
}
.bpf-goal-label {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}
.bpf-goal-text {
  font-size: 18px;
  color: var(--fg-dim);
  line-height: 1.7;
}

/* ── AMS 核心公式 ── */
.ams-formula {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 6%, var(--bg-1));
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
}
.ams-formula .f-lhs {
  color: var(--accent);
  font-weight: 700;
  font-size: 17px;
  white-space: nowrap;
}
.ams-formula .f-eq { color: var(--fg-dim2); }
.ams-formula .f-term { color: var(--fg); font-weight: 500; white-space: nowrap; }
.ams-formula .f-x  { color: var(--fg-dim2); }

/* ── 治理轨道（横贯三条线）── */
.gov-rails {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: color-mix(in srgb, var(--bg-1) 60%, transparent);
}
.gov-rail {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 0;
  padding: 18px 22px;
  border-top: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: background .18s;
  position: relative;
}
.gov-rail:first-child { border-top: 0; }
.gov-rail:hover { background: color-mix(in srgb, var(--accent) 7%, var(--bg)); }
.gov-rail::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--accent);
  opacity: 0.5;
  transition: opacity .18s;
}
.gov-rail:hover::before { opacity: 1; }
.gov-rail-icon {
  font-size: 22px;
  color: var(--accent);
  line-height: 1;
  width: 28px;
  text-align: center;
}
.gov-rail-body {
  padding: 0 20px;
}
.gov-rail-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 2px;
}
.gov-rail-sub {
  font-size: 13.5px;
  color: var(--fg-dim);
}
.gov-rail-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
  flex-shrink: 0;
}
.gov-rail-id {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 4px;
}
.gov-rail-span {
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 10px;
  color: var(--fg-dim2);
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.gov-rails-label {
  padding: 14px 22px 12px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--accent) 8%, var(--bg-1));
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.gov-rails-tagline {
  font-size: 12px;
  color: var(--fg-dim2);
  letter-spacing: 0.04em;
  text-transform: none;
}

/* ── L4 分水岭高亮 ── */
.bpf-head-key {
  position: relative;
}
.bpf-head-key::after {
  content: '分水岭';
  position: absolute;
  bottom: -1px; left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 9px;
  letter-spacing: 0.08em;
  color: var(--accent);
  white-space: nowrap;
  opacity: 0.85;
}
.bpf-cell-head.bpf-head-key {
  border-bottom: 2px solid var(--accent) !important;
  padding-bottom: 18px;
}

/* responsive: stack matrix on small screens */
@media (max-width: 1080px) {
  .bpf-row { grid-template-columns: 160px repeat(5, 1fr); }
  .bpf-cell-side { padding: 14px 12px; }
  .bpf-mod-name, .bpf-side-title { font-size: 14px; }
  .bpf-cell { padding: 12px 8px; }
  .bpf-cell-title { font-size: 12.5px; }
  .bpf-cell-line { font-size: 10.5px; }
  .bp-stage-cards { grid-template-columns: repeat(5, 1fr); gap: 8px; }
  .bp-stage-card { padding: 10px 12px; }
  .bp-st-name { font-size: 14px; }
  .bp-st-desc { font-size: 11px; }
}
@media (max-width: 768px) {
  .bp-stage-cards { grid-template-columns: repeat(2, 1fr); }
  .bpf-gov-header { grid-template-columns: 1fr; }
  .bpf-gov-side { border-right: 0; border-bottom: 1px solid var(--line); }
  .bpf-gov-cards { grid-template-columns: 1fr; }
  .bpf-gov-card { border-left: 0; border-top: 1px solid var(--line); }
  .bpf-gov-card:first-child { border-top: 0; }
}
@media (max-width: 640px) {
  .bp-full-matrix { font-size: 10px; }
  .bpf-row { grid-template-columns: 110px repeat(5, 1fr); }
  .bpf-cell-side { padding: 10px 6px; }
  .bpf-mod-name { font-size: 12px; }
  .bpf-mod-q, .bpf-mod-range, .bpf-side-sub { font-size: 9px; }
  .bpf-cell { padding: 8px 4px; }
  .bpf-cell-title { font-size: 10.5px; }
  .bpf-cell-line { font-size: 9px; }
  .bpf-cell-head { padding: 8px 4px; }
  .bpf-head-name { font-size: 11px; }
  .bpf-head-tag { font-size: 11px; padding: 1px 6px; }
  .bp-stage-cards { grid-template-columns: 1fr; }
}

/* =============================================================
   AVENIA DESIGN LANGUAGE EXTENSIONS — v2.0
   规范类来自 avenia.io 设计 DNA，适配 AMS 紫色主题。
   这些是全站的 canonical 类，design-guide.html 展示它们。
   ============================================================= */

/* ── Type Scale ── */
.h-display {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(48px, 9vw, 120px);
  letter-spacing: -0.025em;
  line-height: 0.97;
  text-transform: lowercase;
}
.h-display .acc { color: var(--accent); }
.h-1 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(36px, 5.5vw, 88px);
  letter-spacing: -0.025em;
  line-height: 1.05;
  text-transform: lowercase;
}
.h-2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(28px, 3.6vw, 56px);
  letter-spacing: -0.02em;
  line-height: 1.08;
  text-transform: lowercase;
}
.h-3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-weight: 500;
  font-size: clamp(20px, 1.8vw, 28px);
  letter-spacing: -0.01em;
  line-height: 1.15;
  text-transform: lowercase;
}
/* Chinese doesn't have case — safe to apply text-transform:lowercase */

/* ── Section Label (avenia style, different from .sec-label) ── */
.section-lbl-a {
  display: flex;
  gap: 12px;
  align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-dim2);
  margin-bottom: clamp(20px, 3vw, 36px);
}
.section-lbl-a .sl-line {
  flex: 0 0 60px;
  height: 1px;
  background: var(--line);
}

/* ── Pill Buttons (avenia style) ── */
.pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 13px 22px;
  border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.02em;
  line-height: 1;
  transition: all .2s ease;
  cursor: pointer;
  text-decoration: none;
}
.pill-btn .arr { display: inline-block; transition: transform .2s ease; }
.pill-btn:hover .arr { transform: translateX(4px); }

.pill-btn.pill-primary {
  border: 1px solid var(--fg);
  color: var(--fg);
  background: transparent;
}
.pill-btn.pill-primary:hover { background: var(--fg); color: var(--bg); }

.pill-btn.pill-secondary {
  border: 1px solid var(--line-2);
  color: var(--fg-dim);
  background: transparent;
}
.pill-btn.pill-secondary:hover { border-color: var(--fg-dim2); color: var(--fg); }

.pill-btn.pill-accent {
  background: var(--accent);
  color: #fff;
  border: 0;
}
.pill-btn.pill-accent:hover { background: var(--accent-hi); }

.pill-btn.pill-sm { padding: 8px 14px; font-size: 11px; }

/* ── Text Link (avenia style) ── */
.text-link-a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 2px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: max-content;
  transition: gap .2s ease;
}
.text-link-a:hover { gap: 12px; }

/* ── Why-Grid (avenia 4-col, 1px gap) ── */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
@media (max-width: 980px) { .why-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 540px) { .why-grid { grid-template-columns: 1fr; } }
.why-card-a {
  background: var(--bg-1);
  padding: 28px 24px;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  overflow: hidden;
  transition: background .22s ease;
}
.why-card-a:hover { background: var(--bg-2); }
.why-card-a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hi));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .35s cubic-bezier(.2,.7,0,1);
}
.why-card-a:hover::after { transform: scaleX(1); }
.why-card-num { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--accent); letter-spacing: 0.1em; }
.why-card-title {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: clamp(17px, 1.5vw, 22px);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--fg);
  margin-top: auto;
}
.why-card-desc { font-size: 13.5px; line-height: 1.6; color: var(--fg-dim); }

/* ── Design Guide FAB ── */
.design-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 100;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  background: color-mix(in srgb, var(--bg-2) 90%, transparent);
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--fg-dim2);
  text-decoration: none;
  transition: all .2s ease;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
}
.design-fab:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.design-fab .fab-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* ================================================================
   ACCESSIBILITY — FOCUS VISIBLE & SKIP LINK
   ================================================================ */

/* Skip-to-main link (hidden until focused) */
.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.5rem 1.25rem;
  background: var(--accent);
  color: var(--accent-fg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  border-radius: 0 0 8px 8px;
  text-decoration: none;
  transition: top 0.15s ease;
}
.skip-link:focus {
  top: 0;
  outline: 2px solid var(--accent-hi);
  outline-offset: 2px;
}

/* Enhanced focus-visible for all interactive elements */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* Nav links */
header nav a:focus-visible,
header .flex a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 4px;
}

/* Buttons */
button:focus-visible,
.pill-btn:focus-visible,
.toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

/* (toggle size already set to 44×44px in the base rule above) */

/* ================================================================
   MOBILE NAVIGATION MENU
   ================================================================ */

/* Hamburger / Close icon swap */
#mobile-menu-btn .icon-close { display: none; }
#mobile-menu-btn.menu-is-open .icon-menu  { display: none; }
#mobile-menu-btn.menu-is-open .icon-close { display: flex; }

/* Mobile menu drawer */
.mobile-menu {
  position: fixed;
  top: 64px;            /* matches h-16 nav bar */
  inset-x: 0;
  z-index: 48;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.28s ease, border-color 0.2s;
}
.mobile-menu.is-open {
  max-height: 480px;
}

/* Always hidden on desktop */
@media (min-width: 1024px) {
  .mobile-menu       { display: none !important; }
  #mobile-menu-btn   { display: none !important; }
}

/* Mobile menu link rows */
.mm-link {
  display: block;
  padding: 0.875rem 0.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: color 0.15s ease, padding-left 0.15s ease;
}
.mm-link:last-child {
  border-bottom: none;
}
.mm-link:hover, .mm-link:focus-visible {
  color: var(--fg);
  padding-left: 0.875rem;
}

/* ============================================================
   V2 · VISUAL ENHANCEMENTS  (glassmorphism · gradient · TTS)
   ============================================================ */

/* ── Glassmorphism card ── */
.glass-card {
  background: rgba(255,255,255,0.035);
  backdrop-filter: blur(18px) saturate(1.15);
  -webkit-backdrop-filter: blur(18px) saturate(1.15);
  border: 1px solid rgba(255,255,255,0.07);
}
[data-theme="light"] .glass-card {
  background: rgba(255,255,255,0.7);
  border: 1px solid rgba(0,0,0,0.07);
}

/* ── Animated gradient drift for hero backgrounds ── */
@keyframes gradientDrift {
  0%   { background-position: 0%   50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0%   50%; }
}
.grad-drift {
  background: linear-gradient(-45deg,
    var(--bg) 0%,
    color-mix(in srgb, var(--accent) 9%, var(--bg)) 30%,
    var(--bg-1) 60%,
    color-mix(in srgb, var(--accent) 5%, var(--bg)) 85%,
    var(--bg) 100%
  );
  background-size: 320% 320%;
  animation: gradientDrift 18s ease infinite;
}
@media (prefers-reduced-motion: reduce) { .grad-drift { animation: none; } }

/* ── Subtle particle / orb pulse ── */
@keyframes orbPulse {
  0%,100% { transform: scale(1) translate(0,0); opacity: .12; }
  33%     { transform: scale(1.08) translate(12px,-8px); opacity: .18; }
  66%     { transform: scale(0.95) translate(-8px,10px); opacity: .10; }
}
.orb-pulse { animation: orbPulse 14s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) { .orb-pulse { animation: none; } }

/* ── Nav frosted glass ── */
.nav-bar {
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
}

/* ── TTS audio tour button ── */
.tts-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px 4px 8px;
  background: color-mix(in srgb, var(--accent) 10%, var(--bg-1));
  border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line));
  border-radius: 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--fg-dim);
  cursor: pointer;
  transition: all .15s ease;
  user-select: none;
  vertical-align: middle;
  margin-left: 10px;
}
.tts-btn:hover { background: color-mix(in srgb, var(--accent) 18%, var(--bg-1)); color: var(--fg); border-color: var(--accent); }
.tts-btn.is-playing,
.tts-btn.is-speaking {
  color: var(--accent);
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 15%, var(--bg-1));
  animation: ttsPulse 1.4s ease-in-out infinite;
}
@keyframes ttsPulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 35%, transparent); }
  50%       { box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 0%, transparent); }
}
.tts-btn svg { flex-shrink:0; }

/* ── Chain flow (关键引用链路) ── */
.km-chains { display: flex; flex-direction: column; gap: 12px; }
.km-chain {
  padding: 18px 22px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--chain-c, var(--accent));
  border-radius: 8px;
  background: color-mix(in srgb, var(--chain-c, var(--accent)) 3.5%, var(--bg-1));
  transition: background .18s ease, border-color .18s ease;
}
.km-chain:hover { background: color-mix(in srgb, var(--chain-c, var(--accent)) 6%, var(--bg-1)); }
.km-chain-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.chain-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--chain-c, var(--accent));
}
.chain-desc {
  font-size: 11.5px;
  color: var(--fg-dim2);
  margin-left: auto;
}
.chain-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
}
.chain-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px 4px 8px;
  background: color-mix(in srgb, var(--chain-c, var(--accent)) 7%, var(--bg));
  border: 1px solid color-mix(in srgb, var(--chain-c, var(--accent)) 22%, var(--line-2));
  border-radius: 20px;
  text-decoration: none;
  color: var(--fg);
  transition: all .14s ease;
  white-space: nowrap;
}
.chain-pill:hover {
  background: color-mix(in srgb, var(--chain-c, var(--accent)) 16%, var(--bg));
  border-color: var(--chain-c, var(--accent));
  transform: translateY(-1px);
  box-shadow: 0 4px 12px color-mix(in srgb, var(--chain-c, var(--accent)) 20%, transparent);
}
.chain-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px;
  font-weight: 700;
  color: var(--chain-c, var(--accent));
  letter-spacing: 0.04em;
}
.chain-name {
  font-size: 11.5px;
  color: var(--fg-dim);
  transition: color .14s ease;
}
.chain-pill:hover .chain-name { color: var(--fg); }
.chain-abbr {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  color: var(--fg-dim3);
}
.chain-arrow {
  color: var(--fg-dim3);
  font-size: 11px;
  font-family: 'JetBrains Mono', monospace;
  flex-shrink: 0;
  user-select: none;
}
.chain-split {
  width: 100%;
  height: 1px;
  background: color-mix(in srgb, var(--chain-c, var(--accent)) 15%, transparent);
  margin: 10px 0 6px;
}

/* ── Visual pattern cards (知识图谱 pattern section) ── */
.pattern-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; }
.pattern-card {
  padding: 14px 16px 12px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--pat-c, var(--accent));
  border-radius: 7px;
  background: var(--bg-1);
  transition: border-color .15s ease, background .15s ease;
}
.pattern-card:hover { border-color: var(--pat-c, var(--accent)); background: var(--bg-2); }
.pattern-card.full { grid-column: 1/-1; }
.pat-id { font-family: 'JetBrains Mono', monospace; font-size: 9px; font-weight: 700; letter-spacing: 0.08em; color: var(--pat-c, var(--accent)); text-transform: uppercase; margin-bottom: 4px; }
.pat-name { font-size: 13.5px; font-weight: 600; color: var(--fg); margin-bottom: 8px; }
.pat-count { font-family: 'JetBrains Mono', monospace; font-size: 9px; color: var(--fg-dim3); margin-bottom: 8px; }
.pat-tags { display: flex; flex-wrap: wrap; gap: 4px; }
.pat-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 7px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px;
  font-weight: 600;
  color: var(--pat-c, var(--accent));
  border: 1px solid color-mix(in srgb, var(--pat-c, var(--accent)) 25%, var(--line-2));
  border-radius: 3px;
  background: color-mix(in srgb, var(--pat-c, var(--accent)) 8%, var(--bg));
  text-decoration: none;
  transition: background .12s ease, border-color .12s ease;
}
.pat-tag:hover { background: color-mix(in srgb, var(--pat-c, var(--accent)) 18%, var(--bg)); border-color: var(--pat-c, var(--accent)); }

/* ── Enhanced bpf-cell-fw badge ── */
.bpf-cell-fw {
  opacity: 0.85 !important;
  font-size: 10px !important;
  letter-spacing: 0.08em !important;
}
.bpf-cell:hover .bpf-cell-fw {
  opacity: 1 !important;
  background: color-mix(in srgb, var(--accent) 15%, var(--bg)) !important;
}

/* ── Agent-readable section (Skill pages) ── */
.agent-manifest {
  border: 1px dashed var(--accent);
  border-radius: 8px;
  padding: 20px 24px;
  background: color-mix(in srgb, var(--accent) 4%, var(--bg-1));
  margin-top: 2rem;
}
.agent-manifest-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.agent-manifest-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--bg));
  padding: 3px 8px;
  border-radius: 3px;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.agent-manifest pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  line-height: 1.7;
  color: var(--fg-dim);
  overflow-x: auto;
  margin: 0;
}
.agent-manifest pre .key { color: var(--accent); }
.agent-manifest pre .val { color: var(--fg); }
.agent-manifest pre .comment { color: var(--fg-dim3); }