.ai-current-page { padding-bottom: 64px; }
.ai-current-hero { padding: 68px 0 52px; border-bottom: 1px solid var(--line); }
.ai-current-hero-grid { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(250px, 1fr); align-items: center; gap: 64px; }
.ai-current-hero h1 { margin: 24px 0; font-size: clamp(36px, 4.6vw, 64px); line-height: 1.16; letter-spacing: -2px; }
.ai-current-hero p { max-width: 640px; color: var(--ink-soft); line-height: 1.9; font-size: 17px; }
.ai-issue-card { background: #203b30; color: #f6f7e9; border-radius: 24px; padding: 32px; box-shadow: 9px 9px 0 #d5dfc0; }
.ai-issue-card > span { font-size: 11px; letter-spacing: 2px; color: #c8ddb6; }
.ai-issue-card > strong { display: flex; align-items: baseline; gap: 16px; font-size: 78px; line-height: 1.5; font-weight: 600; }
.ai-issue-card small { font-size: 16px; font-weight: 400; }
.ai-issue-card h2 { line-height: 1.9; font-size: 23px; }
.ai-issue-card a { margin-top: 24px; padding-top: 20px; border-top: 1px solid #ffffff30; display: flex; align-items: center; justify-content: space-between; gap: 16px; font-size: 14px; color: var(--lime); }
.ai-current-section { padding: 42px 0; }
.ai-section-title { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; margin-bottom: 20px; }
.ai-section-title h2 { margin: 0; font-size: 28px; line-height: 1.4; }
.ai-section-title > span { font-size: 12px; color: var(--ink-soft); }
.ai-section-title a, .ai-source { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; text-underline-offset: 4px; }
.ai-source:hover, .ai-section-title a:hover { text-decoration: underline; }
.ai-source svg { width: 16px; height: 16px; flex-shrink: 0; }
.ai-current-page a:focus-visible, .ai-current-page summary:focus-visible, .ai-comparison-scroll:focus-visible { outline: 3px solid var(--blue); outline-offset: 5px; }
.ai-section-note { color: var(--ink-soft); font-size: 13px; line-height: 1.9; margin: 14px 0 24px; }
.ai-change-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.ai-change-card { background: var(--white); border: 1px solid var(--line); border-radius: 18px; padding: 26px; transition: transform 150ms ease, border-color 150ms ease; }
.ai-change-card:hover { transform: translateY(-3px); border-color: var(--ink); }
.ai-change-card > span { display: block; color: #577557; font-family: monospace; font-size: 14px; }
.ai-change-card h3 { font-size: 20px; margin: 20px 0 12px; line-height: 1.5; }
.ai-change-card p { font-size: 14px; color: var(--ink-soft); line-height: 1.9; margin-bottom: 20px; }
.ai-release-list { border-top: 1px solid var(--line-strong); }
.ai-release-row { display: grid; grid-template-columns: 114px minmax(0, 1fr) 170px; gap: 28px; align-items: start; padding: 26px 0; border-bottom: 1px solid var(--line); }
.ai-release-row time { display: block; font-size: 13px; font-variant-numeric: tabular-nums; }
.ai-release-row small { display: block; color: var(--ink-soft); font-size: 11px; margin-top: 6px; }
.ai-provider { font-size: 11px; letter-spacing: 1px; color: var(--ink-soft); }
.ai-release-row h3 { font-size: 21px; margin: 6px 0 12px; }
.ai-release-row p { font-size: 14px; line-height: 1.85; margin: 0; color: var(--ink-soft); max-width: 680px; }
.ai-release-row > div:last-child { display: flex; flex-direction: column; align-items: flex-start; gap: 16px; padding-top: 20px; }
.ai-spotlight-section { padding: 32px 0; }
.ai-spotlight { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 32px; background: #e8eedc; border: 1px solid #cdd7bb; padding: 28px 32px; border-radius: 20px; }
.ai-spotlight h2 { font-size: 24px; margin: 10px 0; line-height: 1.45; }
.ai-spotlight p { margin: 0; font-size: 14px; color: var(--ink-soft); line-height: 1.85; max-width: 700px; }
.ai-spotlight-links { display: flex; flex-direction: column; gap: 14px; align-items: flex-start; }
.ai-spotlight-links > a { display: inline-flex; align-items: center; gap: 10px; font-size: 13px; }
.ai-filter-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 32px; }
.ai-filter-tabs a { border: 1px solid var(--line); background: var(--white); border-radius: 999px; font-size: 13px; padding: 12px 18px; }
.ai-filter-tabs a.is-active { background: var(--ink); color: white; border-color: var(--ink); }
.ai-comparison-scroll { overflow-x: auto; border: 1px solid var(--line-strong); border-radius: 16px; background: var(--white); }
.ai-comparison { border-collapse: separate; border-spacing: 0; width: 100%; font-size: 13px; }
.ai-comparison caption { text-align: left; padding: 16px 20px; color: var(--ink-soft); background: #edf0e4; font-size: 12px; }
.ai-comparison th, .ai-comparison td { min-width: 216px; max-width: 300px; padding: 20px; text-align: left; vertical-align: top; line-height: 1.85; border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); }
.ai-comparison th:first-child { min-width: 142px; width: 142px; position: sticky; left: 0; background: #f3f2eb; z-index: 1; font-size: 12px; }
.ai-comparison thead th:not(:first-child) { border-top: 4px solid var(--model-color); background: #fafbf5; }
.ai-comparison thead small, .ai-comparison thead strong { display: block; }
.ai-comparison thead small { font-size: 11px; color: var(--ink-soft); font-weight: 400; }
.ai-comparison thead strong { font-size: 18px; margin: 6px 0 14px; }
.ai-comparison tr:last-child td, .ai-comparison tr:last-child th { border-bottom: 0; }
.ai-comparison td:last-child, .ai-comparison th:last-child { border-right: 0; }
.ai-model-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; margin-top: 32px; }
.ai-model-card { padding: 28px; border: 1px solid var(--line); border-top: 5px solid var(--model-color); border-radius: 16px; background: var(--white); }
.ai-model-card h3 { font-size: 24px; margin: 10px 0 16px; }
.ai-model-card p, .ai-media-card p { font-size: 14px; line-height: 1.9; color: var(--ink-soft); }
.ai-model-boundary { border-left: 3px solid #b8c99c; background: #f0f3e8; padding: 16px 20px; margin: 22px 0; }
.ai-model-boundary strong { font-size: 13px; }
.ai-model-boundary p { margin: 8px 0 0; }
.ai-card-links { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; margin-top: 20px; }
.ai-media-section { background: #e9e6de; border-block: 1px solid var(--line); }
.ai-media-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.ai-media-card { background: var(--white); border: 1px solid var(--line); border-radius: 18px; padding: 26px; display: flex; flex-direction: column; align-items: flex-start; }
.ai-type-pill { font-size: 11px; padding: 6px 10px; background: var(--model-color); border-radius: 6px; }
.ai-media-card h3 { font-size: 22px; margin: 20px 0 6px; }
.ai-media-card p { flex: 1; }
.ai-media-card > small { font-size: 11px; color: var(--ink-soft); margin: 10px 0 6px; }
.ai-media-card > strong { font-size: 13px; line-height: 1.6; }
.ai-practice-panel { background: var(--white); border: 1px solid var(--line); border-radius: 20px; padding: 32px; }
.ai-practice-panel h2 { font-size: 24px; line-height: 1.5; }
.ai-practice-panel p { font-size: 14px; line-height: 1.9; color: var(--ink-soft); }
.ai-practice-panel .button { margin-top: 20px; }
.ai-concept-mark { font-size: clamp(38px, 5vw, 72px); font-weight: 700; color: #466d4d; border-left: 1px solid var(--line-strong); padding-left: 40px; overflow-wrap: anywhere; }
.ai-concept-mark small { display: block; font-size: 14px; margin-top: 14px; letter-spacing: 4px; }
.ai-frontier-layout { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 56px; padding-top: 40px; }
.ai-frontier-nav { align-self: start; position: sticky; top: 110px; display: flex; flex-direction: column; gap: 10px; }
.ai-frontier-nav a { display: flex; align-items: center; gap: 12px; font-size: 13px; padding: 12px 14px; border-radius: 8px; }
.ai-frontier-nav a span { color: #788173; font-size: 11px; }
.ai-frontier-nav a.is-active { background: #dce9c6; font-weight: 700; }
.ai-frontier-nav p { font-size: 12px; line-height: 1.9; color: var(--ink-soft); padding: 0 12px; }
.ai-frontier-article { min-width: 0; }
.ai-frontier-article > section { margin-bottom: 40px; }
.ai-frontier-article h2 { font-size: 25px; line-height: 1.5; }
.ai-frontier-article p { line-height: 1.95; }
.ai-definition-panel { padding: 28px; background: var(--white); border: 1px solid var(--line); border-radius: 16px; }
.ai-definition-panel blockquote { font-size: 21px; line-height: 1.6; margin: 20px 0; color: #456849; }
.ai-definition-panel small { font-size: 12px; color: var(--ink-soft); display: block; margin: 14px 0; }
.ai-concept-visual { border: 1px solid #cbd6c3; border-radius: 18px; padding: 28px; background: #e9f0e0; }
.ai-breadth-diagram { margin-top: 24px; }
.ai-axis-label, .ai-axis-bottom { font-size: 12px; color: #456849; }
.ai-axis-label { margin-bottom: 10px; }
.ai-axis-bottom { text-align: right; margin-top: 12px; }
.ai-breadth-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; border-left: 2px solid #58734c; border-bottom: 2px solid #58734c; padding: 0 0 12px 12px; }
.ai-breadth-grid > div { padding: 24px; min-height: 120px; background: #ffffffc4; border-radius: 8px; }
.ai-breadth-grid strong { display: block; margin-bottom: 12px; font-size: 17px; }
.ai-breadth-grid span { font-size: 13px; line-height: 1.8; }
.ai-breadth-grid .is-target, .ai-diagram-node.is-target { background: #294e39; color: white; border: 1px dashed #bfe390; }
.ai-path-diagram { display: grid; grid-template-columns: 1fr 1.6fr 1fr; align-items: center; gap: 16px; margin: 28px 0; }
.ai-diagram-node { background: var(--white); border: 1px solid #bccbb0; border-radius: 12px; padding: 24px 16px; text-align: center; font-size: 22px; font-weight: 700; }
.ai-diagram-node small { display: block; font-size: 12px; font-weight: 400; margin-top: 10px; line-height: 1.7; }
.ai-path-branches { display: grid; gap: 12px; }
.ai-path-branches div { font-size: 13px; padding: 14px; border: 1px solid #b9cba7; background: #f5f9ee; border-radius: 8px; display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.ai-world-diagram { margin: 24px 0; }
.ai-world-diagram > .ai-diagram-node { max-width: 320px; margin: auto; }
.ai-world-branches { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 28px; }
.ai-world-branches > div { text-align: center; }
.ai-world-branches strong { font-size: 13px; }
.ai-world-branches span { display: block; padding: 8px; }
.ai-world-window { position: relative; height: 150px; border: 1px solid #b9cba7; border-radius: 10px; background: linear-gradient(20deg, #d5c9b3 0 30%, #f9f5e8 31% 100%); display: grid; place-items: center; }
.ai-world-window i { display: block; width: 74px; height: 62px; border: 5px solid #708271; background: linear-gradient(90deg, transparent 46%, #708271 46% 54%, transparent 54%), linear-gradient(0deg, #c2e1e7 46%, #708271 46% 54%, #c2e1e7 54%); }
.ai-world-window.is-left i { width: 100px; border-color: #8f7857; background: repeating-linear-gradient(0deg, #ecd29a 0 12px, #8f7857 12px 17px); }
.ai-world-window b { font-size: 12px; padding: 4px 10px; background: #fffdf6dd; font-weight: 400; }
.ai-world-diagram > p { font-size: 12px; text-align: center; }
.ai-evidence-ladder { display: grid; gap: 12px; }
.ai-evidence-ladder > div { padding: 20px; border: 1px solid var(--line); border-left: 4px solid #9bbc7c; background: var(--white); border-radius: 10px; }
.ai-evidence-ladder > div:nth-child(2) { border-left-color: #87a3d8; }
.ai-evidence-ladder > div:nth-child(3) { border-left-color: #e0b579; }
.ai-evidence-ladder p { margin: 8px 0 0; font-size: 14px; color: var(--ink-soft); }
.ai-practice-panel summary { cursor: pointer; padding: 16px 0; font-size: 14px; font-weight: 600; }
.ai-related-links { display: flex; flex-wrap: wrap; gap: 12px; }
.ai-related-links a { border: 1px solid var(--line); border-radius: 8px; padding: 12px 18px; display: flex; gap: 12px; align-items: center; font-size: 13px; }
.ai-next-lesson { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding-block: 24px; border-top: 1px solid var(--line); }
.ai-next-lesson > a:first-child { font-size: 14px; }
.ai-course-update { border: 1px solid #cdd7bb; border-radius: 14px; background: #e8eedc; margin-block: 24px; padding: 22px 28px; display: flex; align-items: center; gap: 24px; }
.ai-course-update p { font-size: 13px; line-height: 1.85; color: var(--ink-soft); margin: 10px 0 0; }
.ai-course-update a { flex-shrink: 0; display: flex; align-items: center; gap: 10px; font-size: 13px; }
@media (max-width: 1180px) {
  .desktop-nav { gap: 16px; }
  .ai-current-hero-grid { gap: 32px; }
}
@media (max-width: 980px) {
  .ai-current-hero-grid { grid-template-columns: 1fr; }
  .ai-issue-card { max-width: 640px; }
  .ai-issue-card > strong { font-size: 58px; }
  .ai-frontier-layout { grid-template-columns: 1fr; gap: 24px; }
  .ai-frontier-nav { position: static; flex-direction: row; flex-wrap: wrap; }
  .ai-frontier-nav p { flex-basis: 100%; margin: 0; }
  .ai-concept-mark { border-left: 0; padding-left: 0; }
  .ai-media-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ai-change-grid { gap: 12px; }
  .ai-change-card { padding: 20px; }
}
@media (max-width: 680px) {
  .ai-current-hero { padding: 36px 0; }
  .ai-current-hero h1 { letter-spacing: -1px; }
  .ai-current-hero p { font-size: 15px; }
  .ai-current-section { padding: 28px 0; }
  .ai-section-title { flex-wrap: wrap; gap: 10px; }
  .ai-section-title h2 { font-size: 23px; }
  .ai-change-grid, .ai-media-grid, .ai-model-grid { grid-template-columns: 1fr; }
  .ai-spotlight { grid-template-columns: 1fr; gap: 20px; padding: 24px; }
  .ai-spotlight h2 { font-size: 21px; }
  .ai-spotlight-links { flex-direction: row; flex-wrap: wrap; }
  .ai-release-row { grid-template-columns: 1fr; gap: 12px; }
  .ai-release-row > div:first-child { display: flex; gap: 10px; align-items: center; }
  .ai-release-row small { margin-top: 0; }
  .ai-release-row > div:last-child { flex-direction: row; padding-top: 0; gap: 22px; }
  .ai-comparison th, .ai-comparison td { padding: 14px; min-width: 190px; }
  .ai-comparison th:first-child { min-width: 98px; width: 98px; }
  .ai-comparison thead strong { font-size: 16px; }
  .ai-filter-tabs a { padding: 10px 13px; font-size: 12px; }
  .ai-practice-panel, .ai-definition-panel, .ai-concept-visual { padding: 22px; }
  .ai-breadth-grid > div { padding: 14px 10px; min-height: 135px; }
  .ai-breadth-grid strong { font-size: 14px; }
  .ai-breadth-grid span { font-size: 12px; }
  .ai-path-diagram { grid-template-columns: 1fr; }
  .ai-path-branches { grid-template-columns: 1fr 1fr; }
  .ai-world-branches { gap: 12px; }
  .ai-world-window { height: 160px; }
  .ai-world-window.is-left i { width: 70px; }
  .ai-course-update { flex-direction: column; align-items: flex-start; padding: 20px; }
  .ai-next-lesson .button { padding-inline: 15px; font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  .ai-change-card { transition: none; }
  .ai-change-card:hover { transform: none; }
}