@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;600;700;800&family=Noto+Serif+TC:wght@500;600&display=swap");

:root {
  --paper: #fafaf6;
  --paper-light: #efefe8;
  --ink: #171814;
  --ink-soft: #51564b;
  --muted: #64685e;
  --line: rgba(23,24,20,.22);
  --line-light: rgba(23,24,20,.14);
  --accent: #caff9f;
  --accent-strong: #b5ed87;
  --moss: #526547;
  --dark: #263524;
  --content: min(1240px, calc(100vw - 64px));
  --reading: min(980px, calc(100vw - 64px));
  --shadow: 0 18px 45px rgba(49, 54, 43, .09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: radial-gradient(circle at 20% 10%, rgba(80,84,71,.035) 0 1px, transparent 1.4px) 0 0 / 13px 13px, var(--paper);
  font-family: "Noto Sans TC", "PingFang TC", sans-serif;
  line-height: 1.75;
}
a { color: inherit; }
button { font: inherit; color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; }
:focus-visible { outline: 3px solid var(--moss); outline-offset: 3px; }

.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; padding: 10px 14px; background: var(--dark); color: #fff; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.reading-rail { position: fixed; z-index: 80; inset: 0 0 auto; height: 4px; background: rgba(185,189,180,.45); }
.reading-rail span { display: block; width: 0; height: 100%; background: var(--moss); }

.site-header {
  min-height: 90px;
  padding: 0 max(32px, calc((100vw - 1240px) / 2));
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--line-light);
  background: rgba(247,245,238,.94);
}
.brand { width: fit-content; font-size: 25px; font-weight: 800; letter-spacing: -.06em; text-decoration: none; }
.desktop-nav { display: flex; gap: 48px; }
.desktop-nav a { text-decoration: none; font-size: 15px; font-weight: 500; }
.header-action { justify-self: end; padding: 10px 20px; border: 1px solid var(--ink); background: var(--accent); text-decoration: none; font-size: 14px; }

.article-hero {
  width: var(--content);
  min-height: 650px;
  margin: 0 auto;
  padding: 70px 0 68px;
  display: grid;
  grid-template-columns: .95fr 1.05fr;
  align-items: center;
  gap: 64px;
  border-bottom: 1px solid var(--line);
}
.hero-copy, .hero-art { min-width: 0; }
.hero-art { margin: 0; }
.back-link { display: inline-block; margin-bottom: 42px; color: var(--ink-soft); font-size: 14px; text-decoration: none; }
.hero-copy h1 { max-width: 680px; margin: 0; font-size: clamp(44px, 4.2vw, 68px); line-height: 1.15; letter-spacing: -.055em; }
.standfirst { max-width: 650px; margin: 30px 0 0; color: var(--ink-soft); font-size: 20px; line-height: 1.8; }
.article-meta { margin-top: 36px; display: flex; flex-wrap: wrap; gap: 0; color: var(--muted); font-size: 13px; }
.article-meta span { padding: 0 16px; border-right: 1px solid var(--line); }
.article-meta span:first-child { padding-left: 0; }
.article-meta span:last-child { border-right: 0; }
.hero-art img { width: 100%; aspect-ratio: 4/3; object-fit: cover; mix-blend-mode: multiply; }
.hero-art figcaption { margin-top: 10px; color: var(--muted); font-size: 12px; text-align: right; }

.lesson { width: var(--reading); margin: 0 auto; padding: 120px 0; border-bottom: 1px solid var(--line); }
.lesson-number, .lesson-index { color: var(--moss); font: 600 15px/1 "Noto Serif TC", serif; }
.lesson-index { margin-bottom: 24px; }
.lesson-heading { display: flex; justify-content: space-between; align-items: end; gap: 40px; }
.lesson-heading > div:first-child { max-width: 720px; }
.lesson-heading h2, .prose h2, .recap h2 { margin: 16px 0 0; font-size: clamp(34px, 4vw, 52px); line-height: 1.22; letter-spacing: -.045em; }
.lesson-heading p, .prose p { color: var(--ink-soft); font-size: 18px; }
.completion { flex: 0 0 auto; color: var(--muted); font-size: 18px; }
.completion-dots { display: inline-flex; gap: 7px; margin-left: 12px; }
.completion-dots i { width: 10px; height: 10px; border: 1px solid var(--line); border-radius: 50%; }
.completion-dots i.is-done { border-color: var(--moss); background: var(--accent-strong); }

.concept-tabs { margin-top: 44px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.concept-tabs button, .comparison-switch button { min-height: 54px; border: 1px solid var(--line); background: transparent; cursor: pointer; font-weight: 600; }
.concept-tabs button[aria-selected="true"], .comparison-switch button[aria-selected="true"] { border-color: var(--ink); background: var(--accent); }
.concept-panel { min-height: 450px; margin-top: 16px; padding: 46px; display: grid; grid-template-columns: .9fr 1.1fr; gap: 54px; align-items: center; border: 1px solid var(--line-light); background: var(--paper-light); box-shadow: var(--shadow); }
.concept-copy h3 { margin: 8px 0 14px; font-size: 30px; line-height: 1.25; }
.concept-copy > p:not(.micro-label) { color: var(--ink-soft); }
.micro-label { margin: 0; color: var(--moss) !important; font-size: 12px !important; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.plain-example { margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--line-light); font-size: 15px; }
.nest-map { min-height: 340px; position: relative; }
.nest, .agent-node { position: absolute; border: 1px solid var(--line); border-radius: 50%; background: #e7e8df; cursor: pointer; transition: transform 180ms ease, border-color 180ms ease, background 180ms ease; }
.nest:hover, .agent-node:hover { transform: scale(1.02); }
.nest.is-active, .agent-node.is-active { border: 2px solid var(--ink); background: var(--accent); box-shadow: 0 0 0 8px rgba(223,246,170,.35); }
.nest span { position: absolute; top: 14px; left: 18px; font-size: 13px; font-weight: 700; }
.nest-ai { width: 320px; height: 320px; inset: 10px auto auto 10px; background: #aab793; }
.nest-model { width: 230px; height: 230px; inset: 55px auto auto 55px; background: #d9d8cf; }
.nest-llm { width: 140px; height: 140px; inset: 100px auto auto 100px; background: #f1eee6; }
.agent-node { width: 142px; height: 142px; right: 0; top: 97px; display: grid; place-content: center; border-radius: 0; background: white; text-align: center; }
.agent-node::before { content: ""; position: absolute; right: 100%; top: 50%; width: 64px; border-top: 1px solid var(--ink); }
.agent-node span { display: block; font-weight: 800; }
.agent-node small { display: block; margin-top: 5px; font-size: 10px; }
.reset-button { margin-top: 16px; padding: 7px 0; border: 0; border-bottom: 1px solid currentColor; background: transparent; color: var(--muted); cursor: pointer; font-size: 13px; }

.prose { max-width: 800px; }
.prose-narrow { max-width: 760px; }
.input-demo { margin-top: 48px; padding: 42px; display: grid; grid-template-columns: 1fr auto 1.2fr; align-items: center; gap: 32px; background: #e7e9df; }
.demo-column { display: grid; gap: 8px; }
.demo-column button { padding: 13px 15px; border: 1px solid transparent; background: rgba(255,255,255,.55); text-align: left; cursor: pointer; }
.demo-column button.is-selected { border-color: var(--ink); background: var(--accent); }
.demo-arrow { font-size: 32px; }
.demo-result { min-height: 180px; padding: 26px; display: flex; flex-direction: column; justify-content: center; background: var(--paper-light); border-left: 4px solid var(--moss); }
.demo-result strong { margin-top: 14px; font-size: 22px; line-height: 1.5; }
.demo-result small { margin-top: 18px; color: var(--muted); }
.note { margin-top: 24px; padding: 22px 26px; border-left: 3px solid var(--accent-strong); background: rgba(223,246,170,.22); color: var(--ink-soft); }

.two-column-copy { display: grid; grid-template-columns: 1fr 310px; gap: 60px; align-items: end; }
.quote-card { padding: 30px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); font: 600 25px/1.55 "Noto Serif TC", serif; transform: rotate(-1.5deg); }
.token-lab { margin-top: 56px; padding: 42px; border: 1px solid var(--line); background: var(--paper-light); }
.lab-header { display: flex; justify-content: space-between; gap: 24px; }
.lab-header h3 { margin: 8px 0 0; font-size: 25px; }
.lab-header button { align-self: start; border: 0; border-bottom: 1px solid currentColor; background: transparent; cursor: pointer; }
.sentence { margin: 40px 0 24px; font: 600 clamp(23px, 3vw, 34px)/1.7 "Noto Serif TC", serif; }
.sentence mark { padding: 0 .25em; background: var(--accent); color: inherit; }
.token-options { display: flex; flex-wrap: wrap; gap: 10px; }
.token-options button { padding: 11px 17px; border: 1px solid var(--line); background: white; cursor: pointer; }
.token-options button.is-selected { border-color: var(--ink); background: var(--accent); }
.probability { margin-top: 34px; padding-top: 28px; border-top: 1px solid var(--line-light); }
.probability > div { display: grid; grid-template-columns: 110px 1fr 120px; gap: 14px; align-items: center; margin: 12px 0; font-size: 13px; }
.probability i { height: 8px; background: linear-gradient(to right, var(--moss) var(--score), var(--line-light) var(--score)); }
.probability b { color: var(--muted); font-weight: 500; }
.probability p { margin-bottom: 0; color: var(--ink-soft); }

.agent-player { margin-top: 52px; }
.agent-steps { display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.agent-steps button { min-height: 90px; padding: 12px; border: 0; border-right: 1px solid var(--line); background: transparent; cursor: pointer; font-size: 13px; }
.agent-steps button:last-child { border-right: 0; }
.agent-steps button[aria-selected="true"] { background: var(--accent); }
.agent-steps span { display: block; color: var(--moss); font-family: "Noto Serif TC", serif; }
.step-stage { min-height: 360px; display: grid; grid-template-columns: 310px 1fr; align-items: center; gap: 62px; padding: 46px; background: #e5e8dd; }
.stage-visual { width: 250px; height: 250px; position: relative; display: grid; place-items: center; border: 1px solid var(--ink); border-radius: 50%; background: var(--paper); }
.stage-visual span { font: 600 76px/1 "Noto Serif TC", serif; }
.stage-visual i { position: absolute; inset: 30px; border: 1px dashed var(--moss); border-radius: 50%; }
.step-stage h3 { margin: 8px 0 10px; font-size: 31px; line-height: 1.3; }
.step-stage p { color: var(--ink-soft); }
.permission { margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 13px; }
.player-controls { padding: 16px 0; display: flex; justify-content: space-between; align-items: center; }
.player-controls button { padding: 8px 0; border: 0; border-bottom: 1px solid currentColor; background: transparent; cursor: pointer; }

.comparison { margin-top: 50px; }
.comparison-switch { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.comparison-body { margin-top: 14px; display: grid; grid-template-columns: .8fr 1.2fr; border: 1px solid var(--line); }
.request-card, .response-card { min-height: 330px; padding: 38px; }
.request-card { display: flex; flex-direction: column; justify-content: center; background: var(--dark); color: #fff; }
.request-card span { color: #c5c9bd; font-size: 12px; }
.request-card p { font: 600 28px/1.55 "Noto Serif TC", serif; }
.response-card { background: var(--paper-light); }
.response-card h3 { margin: 9px 0 22px; font-size: 27px; }
.response-card li { margin: 10px 0; color: var(--ink-soft); }
.boundary { margin: 25px 0 0; padding-top: 20px; border-top: 1px solid var(--line-light); color: var(--moss); font-size: 14px; }

.recap-layout { display: grid; grid-template-columns: 1.05fr .95fr; gap: 70px; }
.recap ol { margin: 42px 0 0; padding: 0; list-style: none; }
.recap li { padding: 16px 0; display: grid; grid-template-columns: 90px 1fr; border-bottom: 1px solid var(--line-light); }
.recap li b { font-size: 18px; }
.recap li span { color: var(--ink-soft); }
.quiz { align-self: start; padding: 34px; background: #e4e7db; }
.quiz h3 { margin: 8px 0 22px; font-size: 25px; }
.quiz button { width: 100%; margin: 6px 0; padding: 14px; border: 1px solid var(--line); background: var(--paper-light); text-align: left; cursor: pointer; }
.quiz button.is-correct { border-color: var(--moss); background: var(--accent); }
.quiz button.is-wrong { border-color: #9f685c; background: #f4e4df; }
.quiz-feedback { min-height: 52px; margin: 18px 0 0; font-size: 14px; }

.sources { width: var(--reading); margin: 0 auto; padding: 70px 0; }
.sources h2 { font-size: 19px; }
.sources ul { padding-left: 20px; color: var(--ink-soft); }
.sources a { text-underline-offset: 4px; }
.article-next { width: var(--content); margin: 30px auto 0; padding: 60px; display: flex; justify-content: space-between; align-items: center; gap: 40px; background: var(--accent); }
.article-next span { display: block; color: var(--moss); font-size: 12px; }
.article-next strong { display: block; margin-top: 8px; font-size: 28px; }
.article-next a { font-weight: 700; text-decoration: none; }
.site-footer { width: var(--content); margin: 0 auto; padding: 80px 0; display: flex; justify-content: space-between; color: var(--ink-soft); }

@media (max-width: 980px) {
  .article-hero { grid-template-columns: 1fr; gap: 30px; }
  .hero-copy { padding-top: 10px; }
  .hero-art { max-width: 720px; }
  .concept-panel, .step-stage { grid-template-columns: 1fr; }
  .nest-map { width: min(520px, 100%); margin: 0 auto; }
  .recap-layout { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  :root { --content: calc(100vw - 36px); --reading: calc(100vw - 36px); }
  .site-header { min-height: 70px; padding: 0 18px; grid-template-columns: 1fr auto; }
  .desktop-nav { display: none; }
  .header-action { padding: 8px 12px; font-size: 12px; }
  .article-hero { min-height: 0; padding: 38px 0 46px; gap: 28px; }
  .back-link { margin-bottom: 26px; }
  .hero-copy h1 { font-size: clamp(33px, 9.5vw, 44px); overflow-wrap: anywhere; }
  .standfirst { margin-top: 22px; font-size: 17px; }
  .article-meta { margin-top: 25px; }
  .article-meta span { padding: 0 8px; font-size: 11px; }
  .hero-art { width: 100%; }
  .hero-art figcaption { text-align: left; }
  .lesson { padding: 78px 0; }
  .lesson-heading { display: block; }
  .completion { margin-top: 28px; }
  .concept-tabs { grid-template-columns: 1fr 1fr; }
  .concept-panel { min-height: 0; padding: 26px 20px; gap: 34px; }
  .nest-map { min-height: 300px; transform: scale(.84); transform-origin: left top; width: 118%; margin-bottom: -45px; }
  .nest-ai { width: 280px; height: 280px; }
  .nest-model { width: 200px; height: 200px; top: 50px; left: 50px; }
  .nest-llm { width: 120px; height: 120px; top: 90px; left: 90px; }
  .agent-node { width: 110px; height: 110px; top: 92px; }
  .agent-node::before { width: 35px; }
  .input-demo { padding: 24px 20px; grid-template-columns: 1fr; gap: 16px; }
  .demo-arrow { transform: rotate(90deg); text-align: center; }
  .two-column-copy { grid-template-columns: 1fr; gap: 25px; }
  .quote-card { width: 90%; }
  .token-lab { padding: 26px 20px; }
  .probability > div { grid-template-columns: 90px 1fr; }
  .probability b { grid-column: 2; }
  .agent-steps { overflow-x: auto; grid-template-columns: repeat(5, 130px); }
  .step-stage { min-height: 0; padding: 32px 22px; gap: 28px; }
  .stage-visual { width: 190px; height: 190px; margin: auto; }
  .comparison-switch { grid-template-columns: 1fr; }
  .comparison-body { grid-template-columns: 1fr; }
  .request-card, .response-card { min-height: 0; padding: 28px 22px; }
  .recap li { grid-template-columns: 75px 1fr; }
  .quiz { padding: 26px 20px; }
  .article-next { padding: 36px 24px; display: block; }
  .article-next strong { font-size: 22px; }
  .article-next a { display: inline-block; margin-top: 30px; }
  .site-footer { padding: 55px 0; display: block; }
  .site-footer p { font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* Quiet reading companion to the editorial homepage. */
body { background: var(--paper); font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif; font-size: 18px; line-height: 1.8; }
h1, h2, h3 { text-wrap: balance; word-break: normal; overflow-wrap: normal; }
.site-header { background: var(--paper); min-height: 96px; }
.brand { letter-spacing: .025em; }
.desktop-nav a, .back-link, .article-next a, .site-footer .brand { display: inline-flex; align-items: center; min-height: 44px; }
.header-action { border: 0; border-radius: 8px; min-height: 48px; padding: 12px 22px; color: var(--dark); font-size: 15px; }
.article-hero { min-height: 640px; grid-template-columns: 1.35fr .8fr; gap: 56px; padding-block: 76px 88px; }
.hero-copy h1 { font-size: clamp(36px, 3.6vw, 56px); line-height: 1.2; font-weight: 600; letter-spacing: .01em; overflow-wrap: normal; }
.standfirst { font-size: 19px; max-width: 34em; }
.article-meta { font-size: 14px; row-gap: 10px; }
.hero-art { align-self: end; }
.hero-art img { border-radius: 45% 45% 2px 2px; mix-blend-mode: normal; }
.hero-art figcaption { font-size: 13px; text-align: left; }
.lesson { padding-block: 88px; }
.lesson-heading h2, .prose h2, .recap h2 { font-size: clamp(30px, 3vw, 44px); line-height: 1.3; font-weight: 500; letter-spacing: .01em; }
.prose, .prose-narrow { max-width: min(70ch, 740px); margin-inline: auto; }
.prose p { line-height: 1.85; margin: 24px 0 0; }
.lesson-index { max-width: 740px; margin-inline: auto; }
.two-column-copy { display: block; }
.quote-card { max-width: 740px; margin: 34px auto 0; padding: 22px 0 22px 26px; border: 0; border-left: 2px solid var(--moss); transform: none; font-size: 25px; }
.concept-panel { padding: 32px; gap: 32px; border: 0; box-shadow: none; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); }
.concept-copy h3, .step-stage h3 { font-size: 28px; font-weight: 500; }
.micro-label { font-size: 13px !important; letter-spacing: .025em; text-transform: none; }
.concept-tabs button, .comparison-switch button, .token-options button, .quiz button, .demo-column button { border-radius: 8px; min-height: 48px; font-size: 16px; transition: background-color 180ms ease, border-color 180ms ease; }
.concept-tabs button[aria-selected="true"], .comparison-switch button[aria-selected="true"] { color: var(--dark); }
.nest-map { width: 100%; min-height: 350px; margin: 0; transform: none; }
.nest-ai { width: 260px; height: 260px; top: 12px; left: 0; background: #dce3d4; }
.nest-model { width: 180px; height: 180px; top: 52px; left: 40px; background: #e5e7de; }
.nest-llm { width: 100px; height: 100px; top: 92px; left: 80px; background: var(--paper); }
.nest span { left: 50%; top: 8px; transform: translateX(-50%); font-size: 14px; white-space: nowrap; }
.nest.is-active, .agent-node.is-active { background: #e5f3d9; box-shadow: none; border-color: var(--moss); }
.agent-node { width: 150px; height: 72px; top: 278px; right: 0; border-radius: 8px; }
.agent-node small { font-size: 12px; }
.agent-node::before { width: 36px; right: 100%; }
.input-demo, .step-stage, .quiz { background: var(--paper-light); }
.demo-arrow { width: 44px; height: 44px; display: grid; place-items: center; justify-self: center; line-height: 1; pointer-events: none; }
.demo-result, .response-card { background: var(--paper); }
.note { background: transparent; border-left-color: var(--moss); }
.token-lab { border-inline: 0; background: transparent; padding-inline: 0; }
.sentence { font-size: clamp(23px, 2.4vw, 31px); }
.agent-steps button { font-size: 15px; }
.step-stage { grid-template-columns: 220px minmax(0, 1fr); gap: 40px; padding: 36px; }
.stage-visual { width: 200px; height: 200px; }
.permission, .plain-example, .boundary { font-size: 15px; }
.comparison-body { border: 0; }
.request-card { background: #e4e8dd; color: var(--ink); }
.request-card span { color: var(--muted); font-size: 14px; }
.response-card h3 { font-size: 26px; font-weight: 500; line-height: 1.4; }
.recap-layout { grid-template-columns: 1fr; gap: 50px; max-width: 740px; margin-inline: auto; }
.quiz { padding: 32px; }
.quiz-feedback { font-size: 16px; }
.article-next { background: transparent; border-block: 1px solid var(--line); padding: 46px 0; }
.article-next span { font-size: 14px; }
.article-next strong { font-weight: 500; }
.article-next a { flex-shrink: 0; }
.reset-button, .lab-header button, .player-controls button { min-width: 44px; min-height: 44px; font-size: 15px; }
.sources a { display: inline-block; padding-block: 7px; }
.site-footer { align-items: center; gap: 30px; font-size: 15px; }
:focus-visible { outline: 3px solid var(--dark); outline-offset: 5px; }
.skip-link:focus-visible { outline-color: var(--accent); }
@media (hover: hover) {
  .concept-tabs button:hover, .comparison-switch button:hover, .token-options button:hover, .quiz button:hover, .demo-column button:hover { border-color: var(--moss); }
  .header-action:hover { background: var(--accent-strong); }
}
@media (max-width: 980px) {
  .article-hero { grid-template-columns: 1fr; gap: 40px; }
  .hero-copy h1 { font-size: clamp(34px, 5.4vw, 52px); }
  .hero-art { width: min(460px, 75%); justify-self: end; }
  .concept-panel { grid-template-columns: 1fr; }
  .nest-map { max-width: 420px; margin-inline: auto; }
  .step-stage { grid-template-columns: 180px minmax(0,1fr); gap: 24px; }
  .stage-visual { width: 160px; height: 160px; }
}
@media (max-width: 760px) {
  :root { --content: calc(100% - 40px); --reading: calc(100% - 40px); }
  body { font-size: 17px; }
  .site-header { min-height: 78px; padding-inline: 20px; }
  .article-hero { padding: 34px 0 56px; min-height: 0; }
  .hero-copy h1 { font-size: clamp(26px, 7.15vw, 42px); line-height: 1.3; }
  .standfirst { font-size: 17px; }
  .article-meta span { font-size: 13px; padding-inline: 8px; }
  .hero-art { width: 86%; }
  .lesson { padding-block: 64px; }
  .lesson-heading h2, .prose h2, .recap h2 { font-size: 30px; }
  .lesson-heading p, .prose p { font-size: 17px; }
  .concept-panel { padding: 22px 16px; }
  .nest-map { min-height: 350px; margin-bottom: 0; }
  .input-demo { padding: 22px 16px; }
  .quote-card { width: 100%; font-size: 23px; padding-left: 20px; }
  .lab-header { gap: 14px; }
  .lab-header button { flex-shrink: 0; }
  .agent-steps { grid-template-columns: repeat(2,minmax(0,1fr)); overflow: visible; gap: 6px; border: 0; }
  .agent-steps button { min-height: 64px; border: 1px solid var(--line); border-radius: 8px; }
  .agent-steps button:last-child { grid-column: 1 / -1; border: 1px solid var(--line); }
  .step-stage { grid-template-columns: 1fr; margin-top: 16px; padding: 26px 20px; }
  .stage-visual { width: 150px; height: 150px; }
  .stage-visual span { font-size: 52px; }
  .recap-layout { gap: 34px; }
  .quiz { padding: 24px 16px; }
  .article-next { padding: 34px 0; }
  .site-footer { display: block; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .nest:hover, .agent-node:hover { transform: none; }
}