/* ============================================================
   模块详情页样式 · 与 _subpage.css 配套
   ----------------------------------------------------
   每个模块根据 tone 切换 hero 背景色
============================================================ */

/* —— ★ 9 模块主色 · 引用 tokens-editorial.css 的锁定色板（长期不变） —— */
:root[data-theme="light"] {
  --n-coral:   var(--mod-coral);    /* 01 MO */
  --n-peach:   var(--mod-peach);    /* 02 UP */
  --n-butter:  var(--mod-butter);   /* 03 VP */
  --n-mint:    var(--mod-mint);     /* 04 DS */
  --n-sky:     var(--mod-sky);      /* 05 AI */
  --n-lilac:   var(--mod-lilac);    /* 06 MS */
  --n-blush:   var(--mod-blush);    /* 07 PF */
  --n-rose:    var(--mod-rose);     /* 08 FS */
  --n-sage:    var(--mod-sage);     /* 09 CS */
  /* 旧别名（兼容老引用） */
  --n-sand:    var(--mod-butter);
  --n-cream:   #FCFAF1;

  /* Accent · 鲜活珊瑚橙（覆盖 _subpage.css 的 token） */
  --accent: #FF6B3D;
  --accent-deep: #D14618;
  --accent-bg: #FFD7C2;
  --accent-soft: #FFEEE3;
}
:root[data-theme="dark"] {
  /* 暗色卡片 · 按 9 模块同序的深色版 */
  --n-coral:   #6B3526;
  --n-peach:   #5C3F1F;
  --n-butter:  #5C4D1A;
  --n-mint:    #2A4F30;
  --n-sky:     #1F3D54;
  --n-lilac:   #3A2F5C;
  --n-blush:   #592E40;
  --n-rose:    #5C2E2A;
  --n-sage:    #3D4525;
  --n-sand:    #5C4D1A;
  --n-cream:   #262626;

  --accent: #FF9269;
  --accent-deep: #FF6B3D;
  --accent-bg: #5C2A18;
  --accent-soft: #36180E;
}

/* ============================================================
   Module hero · 大色块顶栏（左对齐，跟下面 section 同左边线）
============================================================ */
.md-hero {
  padding: 72px 0 64px;
  background: var(--md-bg, var(--bg-2));
  transition: background 320ms ease;
  position: relative;
}
.md-hero__inner {
  max-width: 820px;
}
.md-hero[data-tone="coral"]   { --md-bg: var(--n-coral); }
.md-hero[data-tone="peach"]   { --md-bg: var(--n-peach); }
.md-hero[data-tone="butter"]  { --md-bg: var(--n-butter); }
.md-hero[data-tone="mint"]    { --md-bg: var(--n-mint); }
.md-hero[data-tone="sky"]     { --md-bg: var(--n-sky); }
.md-hero[data-tone="lilac"]   { --md-bg: var(--n-lilac); }
.md-hero[data-tone="blush"]   { --md-bg: var(--n-blush); }
.md-hero[data-tone="rose"]    { --md-bg: var(--n-rose); }
.md-hero[data-tone="sage"]    { --md-bg: var(--n-sage); }
.md-hero[data-tone="cream"]   { --md-bg: var(--n-cream); }

.md-hero .crumb {
  color: rgba(0,0,0,0.55);
  margin-bottom: 32px;
}
:root[data-theme="dark"] .md-hero .crumb { color: rgba(255,255,255,0.65); }
.md-hero .crumb a { color: inherit; }
.md-hero .crumb__current { color: rgba(0,0,0,0.85); font-weight: 600; }
:root[data-theme="dark"] .md-hero .crumb__current { color: rgba(255,255,255,0.95); }

.md-hero__meta {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(0,0,0,0.65);
}
:root[data-theme="dark"] .md-hero__meta { color: rgba(255,255,255,0.7); }

.md-hero__title {
  font-family: 'Noto Serif SC', 'Fraunces', serif;
  font-size: clamp(40px, 5.5vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.015em;
  color: rgba(0,0,0,0.95);
  margin: 0 0 24px;
}
:root[data-theme="dark"] .md-hero__title { color: rgba(255,255,255,0.98); }

.md-hero__question {
  font-family: 'Fraunces', 'Noto Serif SC', serif;
  font-style: italic;
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 500;
  line-height: 1.4;
  color: rgba(0,0,0,0.75);
  margin: 0;
  max-width: 720px;
}
:root[data-theme="dark"] .md-hero__question { color: rgba(255,255,255,0.85); }

/* ============================================================
   ★ Unified Section · 6 大分区统一规范
   ----------------------------------------------------
   每个 section 都是同一种骨架：
     <section class="md-section [md-section--alt]">
       <div class="container">
         <header class="md-section__head">
           <div class="md-section__eyebrow">
             <span class="md-section__num">02</span>
             <span class="md-section__sep">·</span>
             <span>Methods</span>
             <span class="md-section__sep">·</span>
             <span class="md-section__zh">关键方法论</span>
           </div>
           <h2 class="md-section__title">用什么<span class="emp">方法</span>分析？</h2>
           <p class="md-section__lede">(optional)</p>
         </header>
         <div class="md-section__body">…</div>
       </div>
     </section>
============================================================ */
.md-section { padding: 96px 0; position: relative; }
.md-section--alt { background: var(--bg-3); }
.md-section--first { padding-top: 72px; }

@media (max-width: 768px) {
  .md-section { padding: 64px 0; }
}

.md-section__head {
  max-width: 720px;
  margin-bottom: 56px;
}
.md-section__head--center {
  margin-left: auto; margin-right: auto;
  text-align: center;
}

.md-section__eyebrow {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--tx-3);
}
.md-section__num {
  font-family: 'Inter', sans-serif;
  font-feature-settings: 'tnum';
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-deep);
  letter-spacing: 0.04em;
}
.md-section__sep {
  color: var(--tx-4);
  opacity: 0.7;
}
.md-section__zh {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--tx-2);
  text-transform: none;
}

.md-section__title {
  font-family: 'Noto Serif SC', 'Fraunces', serif;
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.18;
  color: var(--tx-1);
  margin: 0;
  letter-spacing: -0.005em;
}
.md-section__title .emp {
  font-style: normal;
  color: var(--accent);
  font-weight: 700;
}

.md-section__lede {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 17px;
  line-height: 1.7;
  color: var(--tx-2);
  margin: 22px 0 0;
  max-width: 640px;
}

.md-section__body { /* container-aware, no extra constraint */ }
.md-section__body--prose { max-width: 820px; }

.md-section__foot {
  margin-top: 40px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ============================================================
   01 Definition · 长文本散文
============================================================ */
.md-definition__text {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 19px;
  line-height: 1.8;
  color: var(--tx-1);
  margin: 0;
}
.md-definition__text strong {
  color: var(--accent-deep);
  font-weight: 600;
}

/* ============================================================
   Grid cards (methods / AI)
============================================================ */
.md-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 900px) { .md-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .md-grid { grid-template-columns: 1fr; } }

.md-card {
  background: var(--bg-card);
  border: 1px solid var(--border-1);
  border-radius: 14px;
  padding: 24px 22px;
  transition: all 220ms ease;
}
.md-card:hover {
  border-color: var(--border-2);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px -8px rgba(0,0,0,0.10);
}
.md-card__title {
  font-family: 'Noto Serif SC', 'Fraunces', serif;
  font-size: 17px;
  font-weight: 700;
  color: var(--tx-1);
  margin: 0 0 10px;
}
.md-card__desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--tx-2);
  margin: 0;
}
.md-card--ai {
  border-left: 3px solid var(--accent);
}

/* ============================================================
   Cases
============================================================ */
.md-cases {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (max-width: 800px) { .md-cases { grid-template-columns: 1fr; } }

.md-case {
  background: var(--bg-card);
  border: 1px solid var(--border-1);
  border-radius: 14px;
  padding: 28px;
  transition: all 220ms ease;
}
.md-case:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.md-case__label {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--accent-deep);
  margin-bottom: 12px;
}
.md-case__title {
  font-family: 'Noto Serif SC', 'Fraunces', serif;
  font-size: 19px;
  font-weight: 700;
  color: var(--tx-1);
  margin: 0 0 10px;
}
.md-case__text {
  font-size: 15px;
  line-height: 1.65;
  color: var(--tx-1);
  margin: 0;
}
.md-case__text strong { color: var(--accent-deep); font-weight: 600; }

/* ============================================================
   Next modules · 链路
============================================================ */
.md-next-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (max-width: 700px) { .md-next-grid { grid-template-columns: 1fr; } }

.md-next {
  background: var(--md-next-bg, var(--bg-card));
  border: 1px solid var(--border-1);
  border-radius: 16px;
  padding: 28px;
  text-decoration: none;
  color: var(--tx-1);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all 280ms ease;
  position: relative;
  overflow: hidden;
}
.md-next[data-tone="coral"]   { --md-next-bg: var(--n-coral); }
.md-next[data-tone="peach"]   { --md-next-bg: var(--n-peach); }
.md-next[data-tone="butter"]  { --md-next-bg: var(--n-butter); }
.md-next[data-tone="mint"]    { --md-next-bg: var(--n-mint); }
.md-next[data-tone="sky"]     { --md-next-bg: var(--n-sky); }
.md-next[data-tone="lilac"]   { --md-next-bg: var(--n-lilac); }
.md-next[data-tone="blush"]   { --md-next-bg: var(--n-blush); }
.md-next[data-tone="rose"]    { --md-next-bg: var(--n-rose); }
.md-next[data-tone="sage"]    { --md-next-bg: var(--n-sage); }
.md-next[data-tone="cream"]   { --md-next-bg: var(--n-cream); }

.md-next:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px -12px rgba(0,0,0,0.20);
}

.md-next__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.md-next__code {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(0,0,0,0.62);
}
:root[data-theme="dark"] .md-next__code { color: rgba(255,255,255,0.72); }
.md-next__arrow {
  font-size: 18px;
  color: rgba(0,0,0,0.55);
  transition: transform 220ms ease;
}
.md-next:hover .md-next__arrow { transform: translateX(4px); }
:root[data-theme="dark"] .md-next__arrow { color: rgba(255,255,255,0.65); }

.md-next__title {
  font-family: 'Noto Serif SC', 'Fraunces', serif;
  font-size: 28px;
  font-weight: 700;
  color: rgba(0,0,0,0.92);
  margin: 0;
  line-height: 1.15;
}
:root[data-theme="dark"] .md-next__title { color: rgba(255,255,255,0.98); }

.md-next__layer {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 12px;
  font-weight: 500;
  color: rgba(0,0,0,0.55);
  margin: 0;
}
:root[data-theme="dark"] .md-next__layer { color: rgba(255,255,255,0.65); }

/* ============================================================
   Reflect section · 想一想（quiz + apply）
============================================================ */
.md-reflect-section {
  background: var(--bg-2);
  border-top: 1px solid var(--border-1);
}

.reflect-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 900px) {
  .reflect-grid { grid-template-columns: 1fr; }
}

.reflect-card {
  background: var(--bg-card);
  border: 1px solid var(--border-1);
  border-radius: 18px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 220ms ease;
}
.reflect-card:hover { border-color: var(--border-2); }
.reflect-card--quiz { border-top: 4px solid #4A90C2; }
.reflect-card--apply { border-top: 4px solid var(--accent); }

.reflect-card__head {
  display: flex; align-items: baseline; gap: 12px;
  padding-bottom: 4px;
}
.reflect-card__num {
  font-family: 'Inter', sans-serif;
  font-weight: 700; font-size: 24px;
  font-feature-settings: 'tnum', 'cv11';
  letter-spacing: -0.04em;
  color: var(--accent);
  line-height: 1;
}
.reflect-card__label {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--tx-3);
}
.reflect-card__question {
  font-family: 'Noto Serif SC', 'Fraunces', serif;
  font-size: 18px; font-weight: 600;
  line-height: 1.5; color: var(--tx-1);
  margin: 0;
}
.reflect-card__question strong { color: var(--accent-deep); }
.reflect-card__hint {
  font-size: 13px; line-height: 1.55;
  color: var(--tx-2); margin: 0;
  padding: 10px 14px;
  background: var(--bg-2);
  border-radius: 8px;
  border-left: 2px solid var(--accent);
}

/* —— Quiz —— */
.quiz-opts {
  display: flex; flex-direction: column; gap: 8px;
}
.quiz-opt {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 16px;
  background: var(--bg-2);
  border: 1px solid var(--border-1);
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: all 180ms ease;
}
.quiz-opt:hover:not([disabled]) {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.quiz-opt[disabled] { cursor: default; }
.quiz-opt__letter {
  font-family: 'Inter', sans-serif;
  font-weight: 700; font-size: 14px;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--tx-1);
  color: var(--bg-1);
  display: grid; place-items: center;
  flex-shrink: 0;
}
.quiz-opt__text {
  font-size: 14px; line-height: 1.5;
  color: var(--tx-1);
  flex: 1;
}
.quiz-opt[data-state="correct"] {
  border-color: #4CAF50;
  background: rgba(76,175,80,0.12);
}
.quiz-opt[data-state="correct"] .quiz-opt__letter {
  background: #4CAF50;
}
.quiz-opt[data-state="wrong"] {
  border-color: #E53935;
  background: rgba(229,57,53,0.10);
}
.quiz-opt[data-state="wrong"] .quiz-opt__letter {
  background: #E53935;
}

.quiz-feedback {
  margin-top: 4px;
  padding: 16px 18px;
  background: var(--bg-2);
  border-radius: 10px;
  border-left: 3px solid var(--accent);
}
.quiz-feedback__result {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  margin-bottom: 8px;
}
.quiz-feedback__result.is-correct { color: #4CAF50; }
.quiz-feedback__result.is-wrong { color: #E53935; }
.quiz-feedback__exp {
  font-size: 14px; line-height: 1.65;
  color: var(--tx-1); margin: 0;
}
.quiz-feedback__exp strong {
  color: var(--accent-deep); font-weight: 600;
}
.quiz-retry {
  margin-top: 12px;
  padding: 6px 14px;
  background: transparent;
  border: 1px solid var(--border-3);
  border-radius: 9999px;
  font-family: 'Inter', sans-serif;
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--tx-2);
  cursor: pointer;
  transition: all 200ms ease;
}
.quiz-retry:hover { background: var(--tx-1); color: var(--bg-1); border-color: var(--tx-1); }

/* —— Reflect input —— */
.reflect-input {
  width: 100%;
  min-height: 120px;
  padding: 14px 16px;
  background: var(--bg-2);
  border: 1px solid var(--border-1);
  border-radius: 10px;
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 15px;
  line-height: 1.65;
  color: var(--tx-1);
  resize: vertical;
  transition: border-color 200ms ease;
}
.reflect-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--bg-card);
}
.reflect-input::placeholder {
  color: var(--tx-3);
  font-style: italic;
}

.reflect-actions {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
}
.reflect-status {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 12px; font-weight: 500;
  color: var(--tx-2);
  letter-spacing: 0.04em;
}
.reflect-save {
  padding: 10px 22px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 9999px;
  font-family: 'Inter', sans-serif;
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.18em; text-transform: uppercase;
  cursor: pointer;
  transition: background 200ms ease;
}
.reflect-save:hover { background: var(--accent-deep); }

/* ============================================================
   Module nav · 上一节 / 下一节
============================================================ */
.md-nav {
  margin-top: 64px;
  padding-top: 36px;
  border-top: 1px solid var(--border-1);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
}
@media (max-width: 700px) {
  .md-nav { grid-template-columns: 1fr; gap: 16px; }
}

.md-nav__btn {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border-1);
  border-radius: 14px;
  text-decoration: none;
  transition: all 220ms ease;
}
.md-nav__btn:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px -8px rgba(0,0,0,0.12);
}
.md-nav__btn--prev { text-align: left; }
.md-nav__btn--next { text-align: right; }
.md-nav__dir {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent);
}
.md-nav__name {
  font-family: 'Noto Serif SC', 'Fraunces', serif;
  font-size: 18px; font-weight: 700;
  color: var(--tx-1);
}

.md-nav__progress {
  text-align: center;
  display: flex; flex-direction: column;
  gap: 2px;
}
.md-nav__progress span {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--tx-3);
}
.md-nav__progress strong {
  font-family: 'Inter', sans-serif;
  font-size: 24px; font-weight: 700;
  font-feature-settings: 'tnum';
  letter-spacing: -0.02em;
  color: var(--tx-1);
}
.md-nav__progress a {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  font-size: 11px; font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-decoration: none;
}
.md-nav__progress a:hover { color: var(--accent-deep); }

/* ============================================================
   In Patterns
============================================================ */
.md-patterns {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.md-pattern {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 14px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-1);
  border-radius: 9999px;
  transition: all 220ms ease;
}
.md-pattern:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.md-pattern__group {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--tx-3);
}
.md-pattern__name {
  font-family: 'Noto Serif SC', 'Fraunces', serif;
  font-size: 15px;
  font-weight: 600;
  color: var(--tx-1);
}