/* ============================================================
   《AI 转型》 子站样式
   A 方向 · 执行内参 (HBR / Stratechery editorial)
   ============================================================ */

:root {
    /* Editorial palette — warmer than parent, gold accent */
    --ai-bg: #FAF7F2;
    --ai-bg-soft: #F2EDE3;
    --ai-bg-card: #FFFFFF;
    --ai-ink: #1A1816;
    --ai-ink-2: #3A352E;
    --ai-ink-3: #7A7268;
    --ai-line: #E0D8C8;
    --ai-line-soft: #ECE5D5;
    --ai-gold: #A37A2C;
    --ai-gold-soft: #C9A35F;
    --ai-red: #9A3B2F;

    --ai-font-cn: 'Noto Sans SC', 'PingFang SC', sans-serif;
    --ai-font-cn-serif: 'Noto Serif SC', 'Songti SC', 'Source Han Serif SC', serif;
    --ai-font-en-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --ai-font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;

    --ai-radius: 4px;
    --ai-radius-md: 8px;

    --ai-max-content: 720px;
    --ai-max-wide: 1180px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--ai-bg);
    color: var(--ai-ink);
    font-family: var(--ai-font-cn-serif);
    font-size: 17px;
    line-height: 1.78;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a {
    color: var(--ai-ink);
    text-decoration: none;
    transition: color 0.18s ease;
}

a:hover { color: var(--ai-gold); }

button {
    font-family: inherit;
    cursor: pointer;
}

/* ============================================================
   NAV
   ============================================================ */

.ai-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(250, 247, 242, 0.92);
    backdrop-filter: saturate(120%) blur(8px);
    -webkit-backdrop-filter: saturate(120%) blur(8px);
    border-bottom: 1px solid var(--ai-line-soft);
}

.ai-nav-inner {
    max-width: var(--ai-max-wide);
    margin: 0 auto;
    padding: 18px 36px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.ai-brand {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.ai-brand-zh {
    font-family: var(--ai-font-cn-serif);
    font-weight: 600;
    font-size: 16px;
    letter-spacing: 0.04em;
}

.ai-brand-en {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    margin-top: 3px;
}

.ai-nav-links {
    display: flex;
    gap: 28px;
    font-family: var(--ai-font-cn);
    font-size: 13px;
    letter-spacing: 0.04em;
}

.ai-nav-links a {
    color: var(--ai-ink-2);
    padding: 6px 0;
    border-bottom: 1px solid transparent;
}

.ai-nav-links a:hover,
.ai-nav-links a.active {
    color: var(--ai-ink);
    border-bottom-color: var(--ai-gold);
}

.ai-nav-back {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
}

.ai-nav-back:hover { color: var(--ai-gold); }

/* ============================================================
   COMMON LAYOUT
   ============================================================ */

.ai-wrap {
    max-width: var(--ai-max-wide);
    margin: 0 auto;
    padding: 0 36px;
}

.ai-reader {
    max-width: var(--ai-max-content);
    margin: 0 auto;
    padding: 0 24px;
}

.ai-eyebrow {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    gap: 14px;
}

.ai-eyebrow::before {
    content: '';
    display: inline-block;
    width: 28px;
    height: 1px;
    background: var(--ai-gold);
}

.ai-hr {
    border: 0;
    border-top: 1px solid var(--ai-line);
    margin: 64px auto;
    max-width: var(--ai-max-content);
}

.ai-hr-thin {
    border: 0;
    border-top: 1px solid var(--ai-line-soft);
    margin: 32px 0;
}

/* ============================================================
   HOME · HERO
   ============================================================ */

.ai-hero {
    padding: 120px 0 80px;
    position: relative;
}

.ai-hero-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 36px;
}

.ai-hero-tag {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.32em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin-bottom: 28px;
}

.ai-hero h1 {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: clamp(2.6rem, 5.6vw, 4.6rem);
    line-height: 1.14;
    letter-spacing: 0.01em;
    margin: 0 0 36px;
    color: var(--ai-ink);
}

.ai-hero h1 em {
    font-style: normal;
    color: var(--ai-gold);
}

.ai-hero-sub {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    font-size: 1.4rem;
    color: var(--ai-ink-3);
    margin: 0 0 56px;
    max-width: 680px;
    line-height: 1.45;
}

.ai-hero-meta {
    display: flex;
    gap: 48px;
    flex-wrap: wrap;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    padding-top: 32px;
    border-top: 1px solid var(--ai-line);
}

.ai-hero-meta strong {
    display: block;
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 24px;
    letter-spacing: 0.02em;
    color: var(--ai-ink);
    margin-bottom: 4px;
    text-transform: none;
}

/* ============================================================
   HOME · ROLE PATHS (CEO / CTO / CHO + 行业入口)
   ============================================================ */

.ai-roles {
    padding: 80px 0 40px;
}

.ai-roles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    margin-top: 48px;
    border-top: 1px solid var(--ai-line);
    border-bottom: 1px solid var(--ai-line);
}

.ai-role {
    padding: 40px 36px;
    border-right: 1px solid var(--ai-line);
    text-decoration: none;
    color: var(--ai-ink);
    display: flex;
    flex-direction: column;
    transition: background 0.2s ease;
    position: relative;
}

.ai-role:last-child { border-right: none; }

.ai-role:hover {
    background: var(--ai-bg-soft);
}

.ai-role-num {
    font-family: var(--ai-font-mono);
    font-size: 12px;
    letter-spacing: 0.2em;
    color: var(--ai-gold);
    margin-bottom: 16px;
}

.ai-role-zh {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 28px;
    margin-bottom: 6px;
}

.ai-role-en {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    color: var(--ai-ink-3);
    margin-bottom: 20px;
    font-size: 15px;
}

.ai-role-desc {
    font-family: var(--ai-font-cn);
    font-size: 14px;
    color: var(--ai-ink-2);
    line-height: 1.7;
    margin-bottom: 24px;
}

.ai-role-cta {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.ai-role:hover .ai-role-cta {
    color: var(--ai-gold);
}

/* ============================================================
   HOME · BOOK TOC (5 parts × chapters)
   ============================================================ */

.ai-toc {
    padding: 96px 0;
}

.ai-toc-title {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 36px;
    margin: 8px 0 56px;
}

.ai-toc-part {
    margin-bottom: 48px;
}

.ai-part-label {
    display: flex;
    align-items: baseline;
    gap: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--ai-line);
    margin-bottom: 24px;
}

.ai-part-num {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--ai-gold);
    text-transform: uppercase;
}

.ai-part-name {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 22px;
}

.ai-part-name-en {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    color: var(--ai-ink-3);
    font-size: 15px;
}

.ai-toc-chapters {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 56px;
}

.ai-toc-chapter {
    display: flex;
    align-items: baseline;
    gap: 20px;
    padding: 16px 0;
    border-bottom: 1px dotted var(--ai-line-soft);
}

.ai-toc-chapter:hover { color: var(--ai-gold); }

.ai-toc-num {
    font-family: var(--ai-font-mono);
    font-size: 12px;
    color: var(--ai-ink-3);
    min-width: 30px;
}

.ai-toc-chapter:hover .ai-toc-num { color: var(--ai-gold); }

.ai-toc-name {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 17px;
    flex: 1;
}

.ai-toc-name-en {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    font-size: 13px;
    color: var(--ai-ink-3);
}

/* ============================================================
   HOME · INDUSTRY GRID
   ============================================================ */

.ai-industries {
    padding: 64px 0 96px;
    background: var(--ai-bg-soft);
    border-top: 1px solid var(--ai-line);
    border-bottom: 1px solid var(--ai-line);
}

.ai-section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 40px;
    gap: 24px;
    flex-wrap: wrap;
}

.ai-section-header h2 {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 32px;
    margin: 8px 0 0;
}

.ai-section-header p {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    color: var(--ai-ink-3);
    margin: 0;
    max-width: 360px;
    font-size: 14px;
    line-height: 1.5;
}

.ai-industry-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--ai-line);
    border: 1px solid var(--ai-line);
}

.ai-industry-card {
    background: var(--ai-bg);
    padding: 28px 24px;
    text-decoration: none;
    color: var(--ai-ink);
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: background 0.18s ease;
    min-height: 120px;
}

.ai-industry-card:hover { background: #fff; }

.ai-industry-num {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--ai-gold);
}

.ai-industry-name {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 19px;
}

.ai-industry-cta {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    margin-top: auto;
}

/* ============================================================
   HOME · FOOTER NOTE
   ============================================================ */

.ai-foot {
    padding: 72px 0 96px;
    text-align: center;
}

.ai-foot p {
    font-family: var(--ai-font-cn-serif);
    color: var(--ai-ink-3);
    max-width: 520px;
    margin: 0 auto 24px;
    line-height: 1.8;
}

.ai-foot a {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--ai-gold);
    text-transform: uppercase;
}

/* ============================================================
   CHAPTER PAGE
   ============================================================ */

.ai-chapter {
    padding: 80px 0 120px;
}

.ai-chapter-header {
    max-width: var(--ai-max-content);
    margin: 0 auto 64px;
    padding: 0 24px;
}

.ai-chapter-eyebrow {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin-bottom: 32px;
}

.ai-chapter-num-big {
    font-family: var(--ai-font-en-serif);
    font-weight: 300;
    font-size: clamp(96px, 18vw, 168px);
    line-height: 0.85;
    color: var(--ai-line);
    margin: 0 0 24px;
    letter-spacing: -0.04em;
}

.ai-chapter-title-zh {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: clamp(2.2rem, 4.8vw, 3.4rem);
    line-height: 1.18;
    letter-spacing: 0.02em;
    margin: 0 0 18px;
    color: var(--ai-ink);
}

.ai-chapter-title-en {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    font-weight: 400;
    font-size: 22px;
    color: var(--ai-ink-3);
    margin: 0 0 48px;
    letter-spacing: 0.01em;
}

/* ============================================================
   CONTENT BLOCKS (shared by chapter / industry / appendix)
   ============================================================ */

.ai-content {
    max-width: var(--ai-max-content);
    margin: 0 auto;
    padding: 0 24px;
}

.ai-content p {
    margin: 0 0 1.4em;
    font-size: 17px;
    line-height: 1.85;
    color: var(--ai-ink-2);
    text-align: justify;
}

.ai-content .ai-subheading {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 20px;
    color: var(--ai-ink);
    margin: 36px 0 16px;
    line-height: 1.4;
}

.ai-content .ai-list-item {
    margin: 0 0 0.7em;
    padding-left: 1.8em;
    position: relative;
    line-height: 1.75;
    color: var(--ai-ink-2);
}

.ai-content .ai-list-item::before {
    content: '·';
    color: var(--ai-gold);
    position: absolute;
    left: 0.6em;
    font-weight: 700;
}

.ai-section-block {
    margin: 56px 0 0;
}

.ai-section-block h2 {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 28px;
    line-height: 1.32;
    margin: 0 0 6px;
    color: var(--ai-ink);
}

.ai-section-block .ai-section-en {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    font-size: 15px;
    color: var(--ai-ink-3);
    margin: 0 0 28px;
}

/* Callouts: 核心观点 / 本章导读 / 战略启示 / 本章小结 */
.ai-callout {
    background: var(--ai-bg-soft);
    border-left: 3px solid var(--ai-gold);
    padding: 28px 32px;
    margin: 36px 0;
    border-radius: 0 var(--ai-radius-md) var(--ai-radius-md) 0;
}

.ai-callout p {
    font-family: var(--ai-font-cn-serif);
    color: var(--ai-ink);
    font-size: 16.5px;
    line-height: 1.85;
    margin: 0 0 0.9em;
}

.ai-callout p:last-child { margin-bottom: 0; }

.ai-callout p strong {
    font-weight: 600;
    color: var(--ai-gold);
    letter-spacing: 0.02em;
}

/* Data tables */
.ai-table-wrap {
    margin: 36px 0;
    overflow-x: auto;
}

.ai-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--ai-font-cn-serif);
    font-size: 15px;
    line-height: 1.65;
}

.ai-table th,
.ai-table td {
    text-align: left;
    padding: 14px 18px;
    border-bottom: 1px solid var(--ai-line-soft);
    vertical-align: top;
    color: var(--ai-ink-2);
}

.ai-table th {
    font-family: var(--ai-font-mono);
    font-weight: 500;
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--ai-gold);
    text-transform: uppercase;
    border-bottom: 1px solid var(--ai-gold);
    padding: 12px 18px;
}

/* Chapter navigation prev/next */
.ai-chapter-nav {
    max-width: var(--ai-max-content);
    margin: 96px auto 0;
    padding: 32px 24px;
    display: flex;
    justify-content: space-between;
    gap: 24px;
    border-top: 1px solid var(--ai-line);
}

.ai-chapter-nav a {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-width: 45%;
}

.ai-chapter-nav .ai-nav-label {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
}

.ai-chapter-nav .ai-nav-name {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 18px;
    color: var(--ai-ink);
}

.ai-chapter-nav .next { text-align: right; align-items: flex-end; }

/* Related concepts / cases / industries panel */
.ai-related {
    max-width: var(--ai-max-content);
    margin: 64px auto 0;
    padding: 32px 24px;
    background: var(--ai-bg-soft);
    border-radius: var(--ai-radius-md);
}

.ai-related h3 {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    margin: 0 0 16px;
}

.ai-related-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ai-related-tag {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: var(--ai-bg);
    border: 1px solid var(--ai-line);
    border-radius: 999px;
    font-family: var(--ai-font-cn-serif);
    font-size: 13px;
    color: var(--ai-ink-2);
}

.ai-related-tag:hover {
    background: var(--ai-gold);
    border-color: var(--ai-gold);
    color: #fff;
}

/* ============================================================
   CONCEPT / GLOSSARY / CASE / INDUSTRY page shared bits
   ============================================================ */

.ai-entity {
    padding: 80px 0 120px;
}

.ai-entity-header {
    max-width: var(--ai-max-content);
    margin: 0 auto 56px;
    padding: 0 24px;
}

.ai-entity-cat {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin-bottom: 24px;
}

.ai-entity-title {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: clamp(2.2rem, 4.6vw, 3.2rem);
    line-height: 1.18;
    margin: 0 0 12px;
    color: var(--ai-ink);
}

.ai-entity-en {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    font-size: 20px;
    color: var(--ai-ink-3);
    margin: 0 0 36px;
}

.ai-entity-lede {
    font-family: var(--ai-font-cn-serif);
    font-size: 19px;
    line-height: 1.78;
    color: var(--ai-ink);
    margin: 0;
    padding: 24px 28px;
    border-left: 3px solid var(--ai-gold);
    background: var(--ai-bg-soft);
    border-radius: 0 var(--ai-radius-md) var(--ai-radius-md) 0;
}

/* Glossary list */
.ai-glossary {
    max-width: var(--ai-max-wide);
    margin: 0 auto;
    padding: 80px 36px 120px;
}

.ai-glossary-search {
    margin: 0 0 48px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--ai-line);
    padding-bottom: 16px;
}

.ai-glossary-search input {
    flex: 1;
    border: none;
    background: transparent;
    font-family: var(--ai-font-cn-serif);
    font-size: 20px;
    padding: 8px 0;
    color: var(--ai-ink);
    outline: none;
}

.ai-glossary-search input::placeholder {
    color: var(--ai-ink-3);
    font-style: italic;
    font-family: var(--ai-font-en-serif);
}

.ai-glossary-search-label {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    margin-right: 16px;
}

.ai-glossary-category {
    margin: 56px 0 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--ai-gold);
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 22px;
    color: var(--ai-ink);
}

.ai-glossary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px 48px;
}

.ai-glossary-item {
    padding-bottom: 24px;
    border-bottom: 1px solid var(--ai-line-soft);
}

.ai-glossary-term-zh {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 19px;
    color: var(--ai-ink);
    margin: 0 0 4px;
}

.ai-glossary-term-en {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    color: var(--ai-ink-3);
    font-size: 14px;
    margin: 0 0 12px;
}

.ai-glossary-def {
    font-family: var(--ai-font-cn-serif);
    font-size: 15px;
    line-height: 1.7;
    color: var(--ai-ink-2);
    margin: 0 0 8px;
}

.ai-glossary-meta {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.16em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
}

/* ============================================================
   CASES INDEX
   ============================================================ */

.ai-cases {
    max-width: var(--ai-max-wide);
    margin: 0 auto;
    padding: 80px 36px 120px;
}

.ai-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--ai-line);
    border: 1px solid var(--ai-line);
    margin-top: 32px;
}

.ai-case-card {
    background: var(--ai-bg);
    padding: 28px 24px;
    text-decoration: none;
    color: var(--ai-ink);
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: background 0.18s ease;
}

.ai-case-card:hover { background: #fff; }

.ai-case-name-zh {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 22px;
}

.ai-case-name-en {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    font-size: 14px;
    color: var(--ai-ink-3);
}

.ai-case-count {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin-top: 12px;
}

.ai-case-mentions {
    margin-top: 32px;
}

.ai-mention {
    padding: 24px 0;
    border-bottom: 1px solid var(--ai-line-soft);
}

.ai-mention-source {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin-bottom: 10px;
}

.ai-mention-excerpt {
    font-family: var(--ai-font-cn-serif);
    font-size: 16px;
    line-height: 1.78;
    color: var(--ai-ink-2);
}

/* ============================================================
   DIAGNOSTIC PAGE
   ============================================================ */

.ai-diagnostic {
    padding: 80px 0 120px;
}

.ai-diag-header {
    max-width: var(--ai-max-content);
    margin: 0 auto 56px;
    padding: 0 24px;
}

.ai-diag-progress {
    max-width: var(--ai-max-content);
    margin: 0 auto 24px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
}

.ai-diag-progress-bar {
    flex: 1;
    height: 2px;
    background: var(--ai-line);
    position: relative;
    overflow: hidden;
}

.ai-diag-progress-fill {
    position: absolute;
    inset: 0 auto 0 0;
    background: var(--ai-gold);
    transition: width 0.32s ease;
}

.ai-diag-card {
    max-width: var(--ai-max-content);
    margin: 0 auto;
    padding: 48px 32px;
    background: var(--ai-bg-card);
    border: 1px solid var(--ai-line);
    border-radius: var(--ai-radius-md);
}

.ai-diag-qnum {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin-bottom: 16px;
}

.ai-diag-q {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 22px;
    line-height: 1.45;
    margin: 0 0 32px;
}

.ai-diag-option {
    display: block;
    width: 100%;
    text-align: left;
    background: transparent;
    border: 1px solid var(--ai-line);
    padding: 18px 22px;
    margin-bottom: 12px;
    font-family: var(--ai-font-cn-serif);
    font-size: 16px;
    color: var(--ai-ink-2);
    border-radius: var(--ai-radius);
    transition: all 0.15s ease;
    line-height: 1.5;
}

.ai-diag-option:hover {
    border-color: var(--ai-gold);
    background: rgba(163, 122, 44, 0.06);
    color: var(--ai-ink);
}

.ai-diag-actions {
    max-width: var(--ai-max-content);
    margin: 24px auto 0;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
}

.ai-diag-actions button,
.ai-diag-actions a {
    background: transparent;
    border: none;
    font-family: inherit;
    font-size: inherit;
    letter-spacing: inherit;
    text-transform: inherit;
    color: var(--ai-ink-3);
    padding: 0;
}

.ai-diag-actions button:hover,
.ai-diag-actions a:hover { color: var(--ai-gold); }

.ai-diag-result {
    max-width: var(--ai-max-content);
    margin: 0 auto;
    padding: 0 24px;
}

.ai-diag-score {
    font-family: var(--ai-font-en-serif);
    font-weight: 300;
    font-size: 96px;
    line-height: 1;
    color: var(--ai-gold);
    margin: 0 0 12px;
    letter-spacing: -0.03em;
}

.ai-diag-result h2 {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 32px;
    margin: 0 0 24px;
}

.ai-diag-result-summary {
    font-family: var(--ai-font-cn-serif);
    font-size: 18px;
    line-height: 1.78;
    color: var(--ai-ink-2);
    margin-bottom: 32px;
}

.ai-diag-actions-list {
    background: var(--ai-bg-soft);
    padding: 28px 32px;
    border-left: 3px solid var(--ai-gold);
    border-radius: 0 var(--ai-radius-md) var(--ai-radius-md) 0;
    margin: 0 0 32px;
}

.ai-diag-actions-list h3 {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin: 0 0 14px;
}

.ai-diag-actions-list ol {
    margin: 0;
    padding-left: 1.4em;
}

.ai-diag-actions-list li {
    font-family: var(--ai-font-cn-serif);
    font-size: 16px;
    line-height: 1.7;
    color: var(--ai-ink);
    margin-bottom: 8px;
}

/* ============================================================
   TOOLKIT INDEX & TOOL PAGES
   ============================================================ */

.ai-toolkit-index {
    max-width: var(--ai-max-wide);
    margin: 0 auto;
    padding: 80px 36px 120px;
}

.ai-tool-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--ai-line);
    border: 1px solid var(--ai-line);
    margin-top: 40px;
}

.ai-tool-card {
    background: var(--ai-bg);
    padding: 32px 28px;
    text-decoration: none;
    color: var(--ai-ink);
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: background 0.18s ease;
    min-height: 200px;
}

.ai-tool-card:hover { background: #fff; }

.ai-tool-tag {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--ai-gold);
    text-transform: uppercase;
}

.ai-tool-name {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 22px;
    line-height: 1.3;
}

.ai-tool-name-en {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    font-size: 14px;
    color: var(--ai-ink-3);
}

.ai-tool-purpose {
    font-family: var(--ai-font-cn-serif);
    font-size: 15px;
    line-height: 1.65;
    color: var(--ai-ink-2);
    margin-top: 8px;
}

.ai-tool-cta {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    margin-top: auto;
}

.ai-tool-card:hover .ai-tool-cta { color: var(--ai-gold); }

/* Tool detail page */
.ai-tool-page {
    max-width: var(--ai-max-wide);
    margin: 0 auto;
    padding: 80px 36px 120px;
}

.ai-tool-header {
    max-width: var(--ai-max-content);
    margin-bottom: 48px;
}

.ai-tool-meta {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    padding-top: 20px;
    border-top: 1px solid var(--ai-line);
    margin-top: 32px;
}

.ai-tool-meta strong {
    color: var(--ai-ink);
    margin-right: 6px;
    font-weight: 500;
}

.ai-tool-canvas {
    background: var(--ai-bg-card);
    border: 1px solid var(--ai-line);
    border-radius: var(--ai-radius-md);
    padding: 40px;
    margin-top: 24px;
}

.ai-canvas-title {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 20px;
    margin: 0 0 8px;
    color: var(--ai-ink);
}

.ai-canvas-instruction {
    font-family: var(--ai-font-cn);
    font-size: 14px;
    color: var(--ai-ink-3);
    margin: 0 0 28px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--ai-line-soft);
    line-height: 1.6;
}

/* Compare-table canvas */
.ai-compare-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
}

.ai-compare-table th {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--ai-gold);
    text-transform: uppercase;
    padding: 10px 16px;
    text-align: left;
    border-bottom: 1px solid var(--ai-gold);
}

.ai-compare-table td {
    padding: 18px 16px;
    border-bottom: 1px solid var(--ai-line-soft);
    vertical-align: top;
    font-family: var(--ai-font-cn-serif);
    font-size: 15px;
    line-height: 1.55;
}

.ai-compare-dim {
    font-weight: 500;
    color: var(--ai-ink);
    width: 18%;
}

.ai-compare-side {
    color: var(--ai-ink-2);
    cursor: pointer;
    border: 2px solid transparent;
    border-radius: var(--ai-radius);
    transition: all 0.15s ease;
}

.ai-compare-side.selected {
    border-color: var(--ai-gold);
    background: rgba(163, 122, 44, 0.07);
}

.ai-compare-evidence {
    margin-top: 24px;
    border-top: 1px dotted var(--ai-line);
    padding-top: 20px;
}

.ai-compare-evidence textarea {
    width: 100%;
    min-height: 80px;
    border: 1px solid var(--ai-line);
    border-radius: var(--ai-radius);
    padding: 12px 14px;
    font-family: var(--ai-font-cn-serif);
    font-size: 14px;
    color: var(--ai-ink);
    background: var(--ai-bg);
    outline: none;
    resize: vertical;
}

.ai-compare-evidence textarea:focus {
    border-color: var(--ai-gold);
}

/* 2x2 matrix */
.ai-2x2 {
    display: grid;
    grid-template-columns: 80px 1fr 1fr;
    grid-template-rows: 60px 1fr 1fr 40px;
    gap: 8px;
    margin-top: 16px;
}

.ai-2x2-axis-y {
    grid-row: 2 / span 2;
    grid-column: 1;
    writing-mode: vertical-rl;
    text-align: center;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--ai-gold);
    text-transform: uppercase;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(180deg);
}

.ai-2x2-axis-x {
    grid-column: 2 / span 2;
    grid-row: 4;
    text-align: center;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--ai-gold);
    text-transform: uppercase;
    padding-top: 12px;
}

.ai-2x2-label {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    grid-row: 1;
    display: flex;
    align-items: end;
    justify-content: center;
    padding-bottom: 4px;
}

.ai-quadrant {
    background: var(--ai-bg);
    border: 1px solid var(--ai-line);
    padding: 24px;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    border-radius: var(--ai-radius);
}

.ai-quadrant h4 {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 17px;
    margin: 0 0 4px;
    color: var(--ai-ink);
}

.ai-quadrant-guidance {
    font-family: var(--ai-font-cn);
    font-size: 13px;
    line-height: 1.6;
    color: var(--ai-ink-3);
    margin: 0 0 12px;
    padding-bottom: 12px;
    border-bottom: 1px dotted var(--ai-line);
}

.ai-quadrant-input textarea {
    width: 100%;
    min-height: 80px;
    border: 1px dashed var(--ai-line);
    background: transparent;
    border-radius: var(--ai-radius);
    padding: 10px 12px;
    font-family: var(--ai-font-cn-serif);
    font-size: 14px;
    color: var(--ai-ink);
    outline: none;
    resize: vertical;
}

.ai-quadrant-input textarea:focus { border-color: var(--ai-gold); }

/* Stage recommendation */
.ai-stage-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.ai-stage-card {
    border: 1px solid var(--ai-line);
    padding: 24px;
    border-radius: var(--ai-radius);
    cursor: pointer;
    transition: all 0.15s ease;
    background: var(--ai-bg);
}

.ai-stage-card:hover { border-color: var(--ai-gold); background: rgba(163, 122, 44, 0.04); }

.ai-stage-card.selected { border-color: var(--ai-gold); background: rgba(163, 122, 44, 0.09); }

.ai-stage-name {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 20px;
    margin-bottom: 6px;
}

.ai-stage-goal {
    font-family: var(--ai-font-cn);
    font-size: 13px;
    color: var(--ai-ink-3);
    margin-bottom: 12px;
}

.ai-stage-ratio {
    font-family: var(--ai-font-mono);
    font-size: 18px;
    color: var(--ai-gold);
    margin: 12px 0 8px;
    letter-spacing: 0.06em;
}

.ai-stage-guidance {
    font-family: var(--ai-font-cn-serif);
    font-size: 14px;
    line-height: 1.6;
    color: var(--ai-ink-2);
}

/* Timeline template */
.ai-timeline {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.ai-timeline-phase {
    border: 1px solid var(--ai-line);
    padding: 28px 32px;
    border-radius: var(--ai-radius-md);
    background: var(--ai-bg);
}

.ai-phase-title {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 22px;
    margin: 0 0 4px;
    color: var(--ai-ink);
}

.ai-phase-goal {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    color: var(--ai-ink-3);
    margin: 0 0 20px;
    font-size: 15px;
}

.ai-phase-tasks {
    margin: 0 0 16px;
    padding: 0;
    list-style: none;
}

.ai-phase-tasks li {
    padding: 8px 0 8px 28px;
    position: relative;
    font-family: var(--ai-font-cn-serif);
    font-size: 15px;
    color: var(--ai-ink-2);
    line-height: 1.65;
}

.ai-phase-tasks li::before {
    content: '☐';
    position: absolute;
    left: 0;
    color: var(--ai-gold);
    font-size: 16px;
    cursor: pointer;
}

.ai-phase-tasks li.done::before { content: '☑'; }
.ai-phase-tasks li.done { color: var(--ai-ink-3); text-decoration: line-through; }

.ai-phase-success {
    margin-top: 16px;
    padding: 14px 18px;
    background: var(--ai-bg-soft);
    border-left: 3px solid var(--ai-gold);
    border-radius: 0 var(--ai-radius) var(--ai-radius) 0;
    font-family: var(--ai-font-cn-serif);
    font-size: 14px;
    color: var(--ai-ink-2);
}

.ai-phase-success strong { color: var(--ai-gold); }

/* Checklist */
.ai-checklist {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.ai-checklist-cat {
    border: 1px solid var(--ai-line);
    border-radius: var(--ai-radius);
    padding: 24px 22px;
    background: var(--ai-bg);
}

.ai-checklist-name {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 18px;
    margin: 0 0 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--ai-gold);
    color: var(--ai-ink);
}

.ai-checklist-item {
    padding: 10px 0 10px 26px;
    position: relative;
    font-family: var(--ai-font-cn-serif);
    font-size: 14px;
    line-height: 1.6;
    color: var(--ai-ink-2);
    cursor: pointer;
    border-bottom: 1px dotted var(--ai-line-soft);
}

.ai-checklist-item:last-child { border-bottom: none; }

.ai-checklist-item::before {
    content: '☐';
    position: absolute;
    left: 0;
    top: 10px;
    color: var(--ai-gold);
    font-size: 15px;
}

.ai-checklist-item.checked::before { content: '☑'; }
.ai-checklist-item.checked { color: var(--ai-ink-3); }

/* Tracker grid */
.ai-tracker {
    overflow-x: auto;
}

.ai-tracker-grid {
    width: 100%;
    border-collapse: collapse;
}

.ai-tracker-grid th {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--ai-gold);
    text-transform: uppercase;
    padding: 14px 12px;
    text-align: left;
    border-bottom: 1px solid var(--ai-gold);
}

.ai-tracker-grid td {
    padding: 12px;
    border-bottom: 1px solid var(--ai-line-soft);
    font-family: var(--ai-font-cn-serif);
    font-size: 14px;
    color: var(--ai-ink-2);
    vertical-align: top;
}

.ai-tracker-indicator-name {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    color: var(--ai-ink);
}

.ai-tracker-hint {
    font-family: var(--ai-font-cn);
    font-size: 12px;
    color: var(--ai-ink-3);
    margin-top: 4px;
}

.ai-tracker-grid input {
    width: 100%;
    border: 1px dashed var(--ai-line);
    background: transparent;
    padding: 6px 10px;
    font-family: var(--ai-font-cn-serif);
    font-size: 14px;
    color: var(--ai-ink);
    border-radius: var(--ai-radius);
}

.ai-tracker-grid input:focus { outline: none; border-color: var(--ai-gold); }

/* Tool action bar */
.ai-tool-actionbar {
    display: flex;
    gap: 16px;
    margin: 32px 0;
    flex-wrap: wrap;
}

.ai-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 22px;
    background: var(--ai-ink);
    color: var(--ai-bg);
    border: none;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    cursor: pointer;
    border-radius: var(--ai-radius);
    text-decoration: none;
    transition: background 0.15s ease;
}

.ai-btn:hover { background: var(--ai-gold); color: #fff; }

.ai-btn.secondary {
    background: transparent;
    color: var(--ai-ink-2);
    border: 1px solid var(--ai-line);
}

.ai-btn.secondary:hover {
    border-color: var(--ai-gold);
    color: var(--ai-gold);
    background: transparent;
}

/* ============================================================
   REFLECTION CARD (chapter end)
   ============================================================ */

.ai-reflection {
    max-width: var(--ai-max-content);
    margin: 64px auto 0;
    padding: 36px 32px;
    background: linear-gradient(180deg, var(--ai-bg-soft) 0%, var(--ai-bg) 100%);
    border: 1px solid var(--ai-line);
    border-radius: var(--ai-radius-md);
}

.ai-reflection-eyebrow {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin-bottom: 14px;
}

.ai-reflection h3 {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 22px;
    margin: 0 0 20px;
    color: var(--ai-ink);
}

.ai-reflection-q {
    font-family: var(--ai-font-cn-serif);
    font-size: 16px;
    color: var(--ai-ink);
    margin-bottom: 8px;
    line-height: 1.65;
}

.ai-reflection-input {
    width: 100%;
    min-height: 72px;
    border: 1px dashed var(--ai-line);
    background: rgba(255,255,255,0.5);
    border-radius: var(--ai-radius);
    padding: 12px 14px;
    font-family: var(--ai-font-cn-serif);
    font-size: 15px;
    line-height: 1.65;
    color: var(--ai-ink);
    margin-bottom: 24px;
    outline: none;
    resize: vertical;
}

.ai-reflection-input:focus {
    border-style: solid;
    border-color: var(--ai-gold);
    background: #fff;
}

.ai-reflection-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    margin-top: 8px;
    padding-top: 16px;
    border-top: 1px solid var(--ai-line-soft);
}

.ai-reflection-meta a:hover { color: var(--ai-gold); }

/* ============================================================
   AUDIO PLAYER (TTS)
   ============================================================ */

.ai-tts-bar {
    position: sticky;
    top: 80px;
    z-index: 30;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    border: 1px solid var(--ai-line);
    border-radius: 999px;
    padding: 10px 20px;
    margin: 24px auto;
    max-width: var(--ai-max-content);
    display: flex;
    align-items: center;
    gap: 16px;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
}

.ai-tts-btn {
    background: var(--ai-ink);
    color: var(--ai-bg);
    border: none;
    border-radius: 999px;
    padding: 8px 18px;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.15s;
}

.ai-tts-btn:hover { background: var(--ai-gold); }

.ai-tts-state { flex: 1; }

.ai-tts-rate {
    background: transparent;
    border: 1px solid var(--ai-line);
    border-radius: var(--ai-radius);
    padding: 4px 10px;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    color: var(--ai-ink-2);
    cursor: pointer;
}

/* ── Premium audio player (MIMO TTS m4a) ── */
.ai-audio-bar {
    position: sticky;
    top: 80px;
    z-index: 30;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid var(--ai-line);
    border-radius: 999px;
    padding: 10px 20px;
    margin: 24px auto;
    max-width: var(--ai-max-content);
    display: flex;
    align-items: center;
    gap: 14px;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--ai-ink-3);
}
.ai-audio-btn {
    background: var(--ai-ink);
    color: var(--ai-bg);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.15s;
}
.ai-audio-btn:hover { background: var(--ai-gold); }
.ai-audio-track {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}
.ai-audio-progress-wrap {
    width: 100%;
    height: 4px;
    background: var(--ai-line);
    border-radius: 2px;
    cursor: pointer;
    position: relative;
}
.ai-audio-progress-fill {
    height: 100%;
    background: var(--ai-gold);
    border-radius: 2px;
    width: 0%;
    transition: width 0.3s linear;
    pointer-events: none;
}
.ai-audio-times {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    color: var(--ai-ink-3);
    letter-spacing: 0.08em;
}
.ai-audio-badge {
    background: var(--ai-gold);
    color: #fff;
    border-radius: 999px;
    padding: 3px 10px;
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    white-space: nowrap;
    flex-shrink: 0;
}

/* ============================================================
   SKILLS PAGE
   ============================================================ */

.ai-skills {
    max-width: var(--ai-max-wide);
    margin: 0 auto;
    padding: 80px 36px 120px;
}

.ai-skill-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-top: 48px;
}

.ai-skill-card {
    border: 1px solid var(--ai-line);
    border-radius: var(--ai-radius-md);
    padding: 36px;
    background: var(--ai-bg-card);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 28px;
    align-items: start;
}

.ai-skill-name {
    font-family: var(--ai-font-mono);
    font-size: 13px;
    letter-spacing: 0.1em;
    color: var(--ai-gold);
    margin: 0 0 8px;
}

.ai-skill-title {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 22px;
    margin: 0 0 12px;
    color: var(--ai-ink);
}

.ai-skill-desc {
    font-family: var(--ai-font-cn-serif);
    font-size: 15px;
    line-height: 1.7;
    color: var(--ai-ink-2);
    margin: 0 0 16px;
}

.ai-skill-trigger {
    background: var(--ai-bg-soft);
    border-left: 3px solid var(--ai-gold);
    padding: 12px 16px;
    border-radius: 0 var(--ai-radius) var(--ai-radius) 0;
    font-family: var(--ai-font-mono);
    font-size: 13px;
    color: var(--ai-ink);
    margin-bottom: 0;
}

.ai-skill-trigger strong {
    color: var(--ai-gold);
    margin-right: 8px;
    font-weight: 500;
}

.ai-skill-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ai-skill-instructions {
    background: var(--ai-bg-soft);
    padding: 28px 32px;
    border-radius: var(--ai-radius-md);
    margin-top: 48px;
}

.ai-skill-instructions h3 {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin: 0 0 16px;
}

.ai-skill-instructions code {
    font-family: var(--ai-font-mono);
    background: var(--ai-bg);
    padding: 3px 8px;
    border-radius: var(--ai-radius);
    border: 1px solid var(--ai-line);
    font-size: 13px;
    color: var(--ai-ink);
}

.ai-skill-instructions pre {
    font-family: var(--ai-font-mono);
    background: var(--ai-bg);
    padding: 16px 20px;
    border-radius: var(--ai-radius);
    border: 1px solid var(--ai-line);
    font-size: 13px;
    color: var(--ai-ink);
    overflow-x: auto;
    margin: 12px 0;
}

/* ============================================================
   JOURNEY PAGE (custom reading path)
   ============================================================ */

.ai-journey {
    max-width: var(--ai-max-content);
    margin: 0 auto;
    padding: 80px 24px 120px;
}

.ai-journey-step {
    border: 1px solid var(--ai-line);
    border-radius: var(--ai-radius-md);
    padding: 36px;
    background: var(--ai-bg-card);
    margin-bottom: 24px;
}

.ai-journey-step h3 {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 20px;
    margin: 0 0 20px;
    color: var(--ai-ink);
}

.ai-journey-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.ai-journey-option {
    background: transparent;
    border: 1px solid var(--ai-line);
    padding: 16px 18px;
    border-radius: var(--ai-radius);
    font-family: var(--ai-font-cn-serif);
    font-size: 15px;
    color: var(--ai-ink-2);
    text-align: left;
    cursor: pointer;
    transition: all 0.15s ease;
}

.ai-journey-option:hover {
    border-color: var(--ai-gold);
    background: rgba(163, 122, 44, 0.06);
}

.ai-journey-option.selected {
    border-color: var(--ai-gold);
    background: rgba(163, 122, 44, 0.1);
    color: var(--ai-ink);
}

.ai-journey-result {
    margin-top: 32px;
    padding: 36px;
    background: var(--ai-bg-soft);
    border-radius: var(--ai-radius-md);
    border-left: 3px solid var(--ai-gold);
}

.ai-journey-path {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ai-journey-path a {
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding: 16px 20px;
    background: var(--ai-bg);
    border: 1px solid var(--ai-line);
    border-radius: var(--ai-radius);
    text-decoration: none;
    color: var(--ai-ink);
}

.ai-journey-path a:hover { border-color: var(--ai-gold); }

.ai-journey-path .num {
    font-family: var(--ai-font-mono);
    font-size: 12px;
    color: var(--ai-gold);
    letter-spacing: 0.1em;
}

.ai-journey-path .name {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    flex: 1;
}

.ai-journey-path .why {
    font-family: var(--ai-font-cn);
    font-size: 13px;
    color: var(--ai-ink-3);
    line-height: 1.5;
    margin-top: 6px;
}

/* ============================================================
   SEARCH PAGE
   ============================================================ */

.ai-search {
    max-width: var(--ai-max-wide);
    margin: 0 auto;
    padding: 80px 36px 120px;
}

.ai-search-input-wrap {
    position: sticky;
    top: 70px;
    z-index: 20;
    background: var(--ai-bg);
    padding: 24px 0 16px;
    margin: 24px 0 0;
    border-bottom: 1px solid var(--ai-line);
}

.ai-search-input {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--ai-gold);
    padding: 14px 0;
    font-family: var(--ai-font-cn-serif);
    font-size: 28px;
    color: var(--ai-ink);
    outline: none;
}

.ai-search-input::placeholder {
    color: var(--ai-ink-3);
    font-style: italic;
    font-family: var(--ai-font-en-serif);
}

.ai-search-filters {
    display: flex;
    gap: 6px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.ai-search-filter {
    background: transparent;
    border: 1px solid var(--ai-line);
    padding: 6px 14px;
    border-radius: 999px;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.15s;
}

.ai-search-filter:hover { border-color: var(--ai-gold); color: var(--ai-gold); }
.ai-search-filter.active { background: var(--ai-ink); border-color: var(--ai-ink); color: var(--ai-bg); }

.ai-search-stats {
    margin: 20px 0;
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
}

.ai-search-hit {
    padding: 22px 0;
    border-bottom: 1px solid var(--ai-line-soft);
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 24px;
    text-decoration: none;
    color: inherit;
}

.ai-search-hit:hover { background: var(--ai-bg-soft); }
.ai-search-hit:hover .ai-search-hit-title { color: var(--ai-gold); }

.ai-search-hit-type {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--ai-gold);
    text-transform: uppercase;
    padding-top: 6px;
}

.ai-search-hit-title {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 18px;
    color: var(--ai-ink);
    margin: 0 0 4px;
    transition: color 0.15s;
}

.ai-search-hit-sub {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    color: var(--ai-ink-3);
    font-size: 13px;
    margin: 0 0 8px;
}

.ai-search-hit-text {
    font-family: var(--ai-font-cn-serif);
    font-size: 15px;
    line-height: 1.65;
    color: var(--ai-ink-2);
    margin: 0;
}

.ai-search-hit-text mark {
    background: rgba(163, 122, 44, 0.2);
    color: var(--ai-gold);
    font-weight: 500;
    padding: 0 2px;
}

.ai-search-hit-meta {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    margin-top: 8px;
}

.ai-search-empty {
    padding: 80px 0;
    text-align: center;
    color: var(--ai-ink-3);
    font-family: var(--ai-font-cn-serif);
    font-size: 17px;
}

/* Reading time badge */
.ai-rt {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    margin-left: 12px;
}

.ai-toc-rt {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    color: var(--ai-ink-3);
    letter-spacing: 0.12em;
    margin-left: 8px;
}

/* In-chapter section nav (sticky right sidebar on wide screens) */
.ai-chapter-toc {
    position: fixed;
    top: 120px;
    right: 24px;
    width: 220px;
    max-height: 72vh;
    overflow-y: auto;
    z-index: 15;
    padding: 18px 18px;
    background: rgba(250, 247, 242, 0.88);
    backdrop-filter: blur(8px);
    border-left: 2px solid var(--ai-line);
    font-family: var(--ai-font-cn-serif);
    font-size: 13px;
    line-height: 1.55;
}

.ai-chapter-toc-label {
    font-family: var(--ai-font-mono);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--ai-gold);
    text-transform: uppercase;
    margin-bottom: 12px;
}

.ai-chapter-toc a {
    display: block;
    padding: 5px 0;
    color: var(--ai-ink-2);
    text-decoration: none;
    border-left: 2px solid transparent;
    padding-left: 10px;
    margin-left: -12px;
    transition: all 0.15s;
}

.ai-chapter-toc a:hover { color: var(--ai-gold); border-left-color: var(--ai-gold); }
.ai-chapter-toc a.active { color: var(--ai-ink); border-left-color: var(--ai-gold); font-weight: 500; }

@media (max-width: 1280px) { .ai-chapter-toc { display: none; } }

/* ============================================================
   404
   ============================================================ */

.ai-404 {
    max-width: 720px;
    margin: 0 auto;
    padding: 160px 36px 120px;
    text-align: center;
}

.ai-404 .num {
    font-family: var(--ai-font-en-serif);
    font-weight: 300;
    font-size: 220px;
    line-height: 0.85;
    color: var(--ai-line);
    margin: 0;
    letter-spacing: -0.04em;
}

.ai-404 h1 {
    font-family: var(--ai-font-cn-serif);
    font-weight: 500;
    font-size: 32px;
    margin: 24px 0 18px;
}

.ai-404 p {
    font-family: var(--ai-font-en-serif);
    font-style: italic;
    color: var(--ai-ink-3);
    font-size: 18px;
    margin: 0 0 32px;
}

/* ============================================================
   PRINT STYLES (toolkit downloads)
   ============================================================ */

@media print {
    body { background: white; color: #000; font-size: 12pt; }
    .ai-nav, .ai-nav-back, .ai-tool-actionbar, .ai-chapter-nav,
    .ai-tts-bar, .ai-reflection-meta, #ai-nav-slot { display: none !important; }

    .ai-tool-canvas, .ai-quadrant, .ai-stage-card, .ai-timeline-phase,
    .ai-checklist-cat, .ai-tracker-grid {
        page-break-inside: avoid;
        box-shadow: none;
        border-color: #333 !important;
    }

    .ai-tool-page, .ai-toolkit-index, .ai-chapter, .ai-content { padding: 0; max-width: 100%; }
    .ai-tool-canvas { border: 1px solid #333; padding: 20px; margin-top: 12px; }
    .ai-canvas-instruction { color: #444; }
    .ai-2x2 { grid-template-rows: 40px 1fr 1fr 24px; }
    .ai-quadrant { min-height: 140px; }
    .ai-quadrant-input textarea { min-height: 60px; }

    a { color: #000; text-decoration: none; }
    .ai-gold, .ai-compare-table th { color: #5a4318 !important; }

    @page { margin: 1.5cm; }
}

/* ============================================================
   READING PROGRESS BAR
   ============================================================ */

.ai-reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--ai-gold);
    z-index: 200;
    transition: width 0.08s linear;
    pointer-events: none;
}

/* ============================================================
   MOBILE NAV · Hamburger + Overlay
   ============================================================ */

.ai-nav-hamburger {
    display: none;
    background: none;
    border: none;
    padding: 6px 4px;
    cursor: pointer;
    color: var(--ai-ink);
    line-height: 1;
    flex-direction: column;
    gap: 5px;
    align-items: center;
    justify-content: center;
}

.ai-nav-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--ai-ink);
    border-radius: 1px;
    transition: opacity 0.15s, transform 0.15s;
}

/* Mobile nav overlay */
.ai-nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--ai-bg);
    z-index: 100;
    flex-direction: column;
    padding: 0;
    overflow-y: auto;
}

.ai-nav-overlay.open {
    display: flex;
}

.ai-nav-overlay-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--ai-line);
}

.ai-nav-overlay-brand {
    font-family: var(--ai-font-cn-serif);
    font-weight: 600;
    font-size: 16px;
    letter-spacing: 0.04em;
    color: var(--ai-ink);
    text-decoration: none;
}

.ai-nav-overlay-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--ai-ink-3);
    cursor: pointer;
    padding: 4px 8px;
    line-height: 1;
}

.ai-nav-overlay-links {
    display: flex;
    flex-direction: column;
    padding: 24px 24px 40px;
    gap: 0;
}

.ai-nav-overlay-links a {
    font-family: var(--ai-font-cn-serif);
    font-size: 22px;
    font-weight: 500;
    color: var(--ai-ink);
    padding: 16px 0;
    border-bottom: 1px solid var(--ai-line-soft);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    letter-spacing: 0.02em;
}

.ai-nav-overlay-links a:last-child { border-bottom: none; }

.ai-nav-overlay-links a.active { color: var(--ai-gold); }

.ai-nav-overlay-links a::after {
    content: '→';
    font-family: var(--ai-font-mono);
    font-size: 14px;
    color: var(--ai-ink-3);
}

.ai-nav-overlay-footer {
    padding: 24px;
    border-top: 1px solid var(--ai-line);
    margin-top: auto;
}

.ai-nav-overlay-footer a {
    font-family: var(--ai-font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--ai-ink-3);
    text-transform: uppercase;
    text-decoration: none;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 900px) {
    .ai-nav-inner { padding: 14px 22px; }
    .ai-wrap { padding: 0 22px; }
    .ai-reader, .ai-content, .ai-chapter-header, .ai-chapter-nav, .ai-related { padding-left: 22px; padding-right: 22px; }
    .ai-hero-inner { padding: 0 22px; }
    .ai-roles-grid { grid-template-columns: 1fr; }
    .ai-role { border-right: none; border-bottom: 1px solid var(--ai-line); }
    .ai-role:last-child { border-bottom: none; }
    .ai-toc-chapters { grid-template-columns: 1fr; gap: 0; }
    .ai-industry-grid { grid-template-columns: repeat(2, 1fr); }
    .ai-cases-grid { grid-template-columns: repeat(2, 1fr); }
    .ai-glossary-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .ai-nav-links { display: none; }
    .ai-nav-back { display: none; }
    .ai-nav-hamburger { display: flex; }
}

@media (max-width: 560px) {
    body { font-size: 16px; }
    .ai-hero { padding: 80px 0 56px; }
    .ai-hero h1 { font-size: 2.2rem; }
    .ai-hero-sub { font-size: 1.1rem; }
    .ai-industry-grid, .ai-cases-grid { grid-template-columns: 1fr; }
    .ai-content p { font-size: 16px; }
    .ai-callout { padding: 22px 22px; }
    .ai-chapter-num-big { font-size: 96px; }
}

/* ── Industry Skill CTA ── */
.ai-skill-cta {
    display: flex; gap: 20px; align-items: flex-start;
    margin: 56px 0 0;
    padding: 28px 32px;
    background: color-mix(in srgb, var(--ai-gold) 6%, var(--ai-surface));
    border: 1px solid color-mix(in srgb, var(--ai-gold) 30%, transparent);
    border-radius: 14px;
}
.ai-skill-cta-icon { font-size: 2rem; line-height: 1; flex-shrink: 0; margin-top: 2px; }
.ai-skill-cta-title { font-size: 1.05rem; font-weight: 600; color: var(--ai-ink); margin-bottom: 6px; }
.ai-skill-cta-desc { font-size: 0.92rem; color: var(--ai-ink-2); line-height: 1.6; margin-bottom: 16px; }
.ai-skill-cta-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.ai-btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 18px;
    border-radius: 8px; font-size: 0.88rem; font-weight: 500; text-decoration: none;
    transition: opacity .15s, transform .15s; }
.ai-btn:hover { opacity: .85; transform: translateY(-1px); }
.ai-btn-primary { background: var(--ai-gold); color: #fff; }
.ai-btn-ghost { background: transparent; color: var(--ai-ink-2);
    border: 1px solid var(--ai-line); }
@media (max-width: 600px) {
    .ai-skill-cta { flex-direction: column; padding: 22px; }
}