:root {
  --wine: #641322;
  --wine-deep: #4a0e18;
  --champagne: #b8965a;
  --ivory: #f7f2e8;
  --porcelain: #fbfaf6;
  --mist: #ede6da;
  --stone: #d8d1c5;
  --ink: #181614;
  --ink-soft: #5f5952;
  --olive: #5a6147;
  --rule: rgba(24, 22, 20, 0.16);
  --rule-gold: rgba(184, 150, 90, 0.42);
  --serif: "Cormorant Garamond", "Noto Serif TC", serif;
  --sans: "Manrope", "Noto Sans TC", sans-serif;
  --mono: "IBM Plex Mono", monospace;
  --frame: 1240px;
  color-scheme: light;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body {
  margin: 0;
  background: var(--ivory);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 300;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--porcelain);
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

.guide-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  padding: 14px max(28px, calc((100vw - var(--frame)) / 2));
  border-bottom: 1px solid var(--rule);
  background: rgba(247, 242, 232, 0.94);
  backdrop-filter: blur(20px);
}

.guide-wordmark {
  display: inline-flex;
  flex-direction: column;
  width: max-content;
  text-decoration: none;
}

.guide-wordmark span {
  color: var(--wine);
  font-family: var(--serif);
  font-size: 25px;
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1;
}

.guide-wordmark small {
  margin-top: 7px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.26em;
}

.guide-header-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
}

.guide-header-nav a {
  text-decoration: none;
  text-transform: uppercase;
}

.guide-header-nav a:not(.header-cta) { border-bottom: 1px solid transparent; }
.guide-header-nav a:not(.header-cta):hover { border-bottom-color: var(--wine); }

.guide-header-nav .header-cta {
  padding: 8px 15px;
  border: 1px solid var(--wine);
  color: var(--wine);
}

.guide-header-nav .header-cta:hover {
  background: var(--wine);
  color: var(--porcelain);
}

.guide-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  gap: clamp(54px, 7vw, 116px);
  align-items: center;
  width: min(calc(100% - 56px), var(--frame));
  min-height: 710px;
  margin: 0 auto;
  padding: 96px 0 104px;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--champagne);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.26em;
  line-height: 1.5;
  text-transform: uppercase;
}

.guide-hero h1 {
  max-width: 720px;
  margin: 0;
  color: var(--wine);
  font-family: var(--serif);
  font-size: clamp(58px, 7vw, 104px);
  font-weight: 300;
  letter-spacing: -0.052em;
  line-height: 0.92;
}

.guide-hero-lead {
  max-width: 660px;
  margin: 38px 0 0;
  color: var(--ink-soft);
  font-family: "Noto Serif TC", var(--serif);
  font-size: 17px;
  line-height: 2;
}

.guide-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 38px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 22px;
  border: 1px solid var(--wine);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-decoration: none;
  transition: background-color 180ms ease, color 180ms ease;
}

.button-primary { background: var(--wine); color: var(--porcelain); }
.button-primary:hover { background: var(--wine-deep); }
.button-ghost { background: transparent; color: var(--wine); }
.button-ghost:hover { background: var(--wine); color: var(--porcelain); }

.guide-access-note {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 28px 0 0;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--olive);
}

.guide-hero-specimen {
  border: 1px solid var(--wine);
  background: var(--porcelain);
  box-shadow: 0 30px 80px -60px rgba(24, 22, 20, 0.55);
}

.specimen-head {
  display: flex;
  justify-content: space-between;
  padding: 15px 18px;
  border-bottom: 1px solid var(--wine);
  color: var(--wine);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.2em;
}

.chat-turn { padding: 28px 28px 24px; }
.chat-turn + .chat-turn { border-top: 1px solid var(--rule); }

.chat-role {
  color: var(--champagne);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.22em;
}

.chat-turn p {
  margin: 10px 0 0;
  font-family: "Noto Serif TC", var(--serif);
  font-size: 15px;
  line-height: 1.9;
}

.chat-turn-user { margin: 18px 18px 0 54px; border-left: 2px solid var(--wine); background: var(--ivory); }
.chat-turn-bot { margin: 0 54px 18px 18px; border-left: 2px solid var(--champagne); }

.formula-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--wine);
}

.formula-strip span {
  padding: 15px 8px;
  color: var(--wine);
  font-family: var(--mono);
  font-size: 8px;
  text-align: center;
}

.formula-strip span + span { border-left: 1px solid var(--rule); }
.formula-strip b { display: block; margin-bottom: 4px; font-weight: 400; letter-spacing: 0.14em; }

.guide-section-nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  width: min(calc(100% - 56px), var(--frame));
  margin: 0 auto;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.guide-section-nav a {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 18px 20px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-decoration: none;
}

.guide-section-nav a + a { border-left: 1px solid var(--rule); }
.guide-section-nav a:hover { background: var(--mist); }
.guide-section-nav span { color: var(--champagne); }

.guide-section {
  width: min(calc(100% - 56px), 1040px);
  margin: 0 auto;
  padding: 128px 0;
}

.guide-section-wide { width: min(calc(100% - 56px), var(--frame)); }

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 1.1fr);
  column-gap: clamp(50px, 8vw, 130px);
  align-items: start;
  margin-bottom: 68px;
}

.section-heading .eyebrow { grid-column: 1 / -1; }

.section-heading h2 {
  margin: 0;
  color: var(--wine);
  font-family: var(--serif);
  font-size: clamp(43px, 5vw, 70px);
  font-weight: 300;
  letter-spacing: -0.04em;
  line-height: 1;
}

.section-heading > p:last-child {
  margin: 0;
  color: var(--ink-soft);
  font-family: "Noto Serif TC", var(--serif);
  font-size: 16px;
  line-height: 2;
}

.step-list { margin: 0; padding: 0; border-top: 1px solid var(--ink); list-style: none; }

.step-list li {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 30px;
  padding: 33px 0;
  border-bottom: 1px solid var(--rule);
}

.step-number { color: var(--champagne); font-family: var(--serif); font-size: 30px; font-style: italic; }
.step-list h3 { margin: 0 0 8px; font-family: "Noto Serif TC", var(--serif); font-size: 21px; font-weight: 400; }
.step-list p { max-width: 720px; margin: 0; color: var(--ink-soft); }

.atelier-note {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 32px;
  margin-top: 54px;
  padding: 26px 0;
  border-top: 1px solid var(--rule-gold);
  border-bottom: 1px solid var(--rule-gold);
}

.atelier-note .eyebrow { margin: 4px 0 0; }
.atelier-note > p:last-child { margin: 0; font-family: "Noto Serif TC", var(--serif); font-size: 15px; }

.type-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
  border-left: 1px solid var(--rule);
}

.type-grid article {
  min-height: 240px;
  padding: 26px 24px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.type-grid article > span { color: var(--champagne); font-family: var(--serif); font-size: 24px; font-style: italic; }
.type-grid h3 { margin: 36px 0 5px; font-family: "Noto Serif TC", var(--serif); font-size: 18px; font-weight: 400; }
.type-grid code { color: var(--wine); font-family: var(--mono); font-size: 9px; letter-spacing: 0.08em; }
.type-grid p { margin: 15px 0 0; color: var(--ink-soft); font-size: 12px; line-height: 1.7; }
.type-grid article:hover { background: var(--porcelain); }

.safety-note {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  gap: 64px;
  align-items: center;
  margin-top: 52px;
  padding: 38px 40px;
  border: 1px solid var(--wine);
}

.safety-note .eyebrow { margin-bottom: 12px; }
.safety-note h3 { margin: 0; color: var(--wine); font-family: "Noto Serif TC", var(--serif); font-size: 24px; font-weight: 400; }
.safety-note > p { margin: 0; color: var(--ink-soft); font-size: 14px; }

.prompt-framework {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.prompt-field { padding: 24px 18px; }
.prompt-field + .prompt-field { border-left: 1px solid var(--rule); }
.prompt-field span { display: block; margin-bottom: 34px; color: var(--champagne); font-family: var(--serif); font-size: 23px; font-style: italic; }
.prompt-field strong { display: block; font-family: "Noto Serif TC", var(--serif); font-size: 15px; font-weight: 500; }
.prompt-field p { margin: 8px 0 0; color: var(--ink-soft); font-size: 11px; line-height: 1.6; }

.prompt-template { margin: 54px 0 84px; border: 1px solid var(--wine); background: var(--porcelain); }
.prompt-template-head { display: flex; justify-content: space-between; padding: 13px 18px; border-bottom: 1px solid var(--wine); color: var(--wine); font-family: var(--mono); font-size: 8px; letter-spacing: 0.18em; }
.prompt-template blockquote { margin: 0; padding: 36px 42px; color: var(--wine); font-family: "Noto Serif TC", var(--serif); font-size: 21px; line-height: 2; }

.example-list { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--ink); border-left: 1px solid var(--rule); }
.example-list article { padding: 38px 36px 42px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.example-list .eyebrow { margin-bottom: 12px; }
.example-list h3 { margin: 0 0 25px; font-family: "Noto Serif TC", var(--serif); font-size: 24px; font-weight: 400; }
.example-message { margin: 0; padding: 22px 24px; border-left: 2px solid var(--wine); background: var(--porcelain); font-family: "Noto Serif TC", var(--serif); font-size: 14px; line-height: 1.9; }
.example-result { margin: 22px 0 0; color: var(--ink-soft); font-size: 12px; line-height: 1.8; }

.guide-section-dark {
  width: 100%;
  max-width: none;
  padding: 128px max(28px, calc((100vw - 1040px) / 2));
  background: var(--ink);
  color: var(--porcelain);
}

.guide-section-dark .section-heading h2 { color: var(--porcelain); }
.guide-section-dark .section-heading > p:last-child { color: rgba(251, 250, 246, 0.67); }

.workflow-list { margin: 0; padding: 0; border-top: 1px solid rgba(251, 250, 246, 0.45); list-style: none; }
.workflow-list li { display: grid; grid-template-columns: 80px 1fr; gap: 30px; padding: 30px 0; border-bottom: 1px solid rgba(251, 250, 246, 0.15); }
.workflow-list li > span { color: var(--champagne); font-family: var(--serif); font-size: 27px; font-style: italic; }
.workflow-list h3 { margin: 0 0 6px; font-family: "Noto Serif TC", var(--serif); font-size: 19px; font-weight: 400; }
.workflow-list p { margin: 0; color: rgba(251, 250, 246, 0.62); font-size: 13px; }

.save-rule {
  display: grid;
  grid-template-columns: 1fr 60px 1fr;
  align-items: center;
  margin-top: 58px;
  border: 1px solid var(--champagne);
}

.save-rule > div:not(.save-rule-arrow) { padding: 30px 34px; }
.save-rule span { color: var(--champagne); font-family: "Noto Serif TC", var(--serif); font-size: 22px; }
.save-rule p { margin: 7px 0 0; color: rgba(251, 250, 246, 0.65); font-size: 12px; }
.save-rule-arrow { color: var(--champagne); font-family: var(--serif); font-size: 26px; text-align: center; }
.dark-footnote { margin: 22px 0 0; color: rgba(251, 250, 246, 0.45); font-family: var(--mono); font-size: 8px; letter-spacing: 0.08em; }

.command-table-wrap { overflow-x: auto; border-top: 1px solid var(--ink); }
.command-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.command-table th, .command-table td { padding: 18px 16px; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.command-table th { color: var(--ink-soft); font-family: var(--mono); font-size: 8px; font-weight: 400; letter-spacing: 0.17em; text-transform: uppercase; }
.command-table th:last-child, .command-table td:last-child { width: 150px; }
.command-table code { color: var(--wine); font-family: "Noto Serif TC", var(--serif); font-size: 15px; font-weight: 500; }

.limits-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 72px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.limits-grid > div { padding: 30px 28px; }
.limits-grid > div + div { border-left: 1px solid var(--rule); }
.metric-value { display: block; color: var(--wine); font-family: var(--serif); font-size: 54px; font-weight: 300; line-height: 1; }
.metric-label { display: block; margin-top: 12px; font-family: var(--mono); font-size: 9px; letter-spacing: 0.12em; }
.limits-grid p { margin: 18px 0 0; color: var(--ink-soft); font-size: 11px; line-height: 1.7; }

.faq-list { border-top: 1px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--rule); }
.faq-list summary { position: relative; padding: 26px 52px 26px 0; cursor: pointer; font-family: "Noto Serif TC", var(--serif); font-size: 18px; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { position: absolute; top: 25px; right: 8px; color: var(--champagne); content: "+"; font-family: var(--serif); font-size: 25px; font-weight: 300; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { max-width: 790px; margin: -5px 0 28px; color: var(--ink-soft); font-size: 14px; }

.guide-cta { padding: 120px 28px; border-top: 1px solid var(--rule-gold); background: var(--porcelain); text-align: center; }
.guide-cta h2 { margin: 0; color: var(--wine); font-family: var(--serif); font-size: clamp(48px, 6vw, 80px); font-weight: 300; letter-spacing: -0.04em; line-height: 1; }
.guide-cta > p:not(.eyebrow) { max-width: 620px; margin: 28px auto 0; color: var(--ink-soft); font-family: "Noto Serif TC", var(--serif); font-size: 15px; }
.guide-actions-center { justify-content: center; }

.guide-footer {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 40px;
  align-items: center;
  padding: 38px max(28px, calc((100vw - var(--frame)) / 2));
  border-top: 1px solid var(--ink);
}

.guide-footer > p { margin: 0; color: var(--ink-soft); font-size: 10px; text-align: center; }
.guide-footer > div { display: flex; gap: 12px; align-items: center; font-family: var(--mono); font-size: 8px; letter-spacing: 0.08em; }
.guide-footer a { text-underline-offset: 4px; }

@media (max-width: 980px) {
  .guide-header-nav a:not(.header-cta) { display: none; }
  .guide-hero { grid-template-columns: 1fr; padding-top: 72px; }
  .guide-hero-specimen { width: min(100%, 600px); }
  .guide-section-nav { overflow-x: auto; grid-template-columns: repeat(5, minmax(160px, 1fr)); }
  .type-grid { grid-template-columns: repeat(3, 1fr); }
  .prompt-framework { grid-template-columns: repeat(5, minmax(150px, 1fr)); overflow-x: auto; }
  .guide-footer { grid-template-columns: 1fr; justify-items: center; }
  .guide-footer > div { flex-wrap: wrap; justify-content: center; }
}

@media (max-width: 720px) {
  html { scroll-padding-top: 76px; }
  body { font-size: 15px; }
  .guide-header { min-height: 64px; padding: 12px 18px; }
  .guide-wordmark span { font-size: 22px; }
  .guide-header-nav { gap: 0; }
  .guide-header-nav .header-cta { padding: 7px 10px; font-size: 8px; }
  .guide-hero { width: min(calc(100% - 36px), var(--frame)); min-height: auto; padding: 62px 0 72px; }
  .guide-hero h1 { font-size: clamp(40px, 12.2vw, 47px); }
  .guide-hero-lead { margin-top: 28px; font-size: 15px; line-height: 1.9; }
  .guide-actions { display: grid; grid-template-columns: 1fr; }
  .button { width: 100%; }
  .guide-access-note { align-items: flex-start; line-height: 1.6; }
  .guide-hero-specimen { width: 100%; }
  .chat-turn { padding: 20px 18px; }
  .chat-turn-user { margin: 12px 12px 0 32px; }
  .chat-turn-bot { margin: 0 32px 12px 12px; }
  .chat-turn p { font-size: 13px; }
  .formula-strip { grid-template-columns: 1fr; }
  .formula-strip span + span { border-top: 1px solid var(--rule); border-left: 0; }
  .guide-section-nav { width: 100%; border-left: 0; border-right: 0; }
  .guide-section { width: min(calc(100% - 36px), 1040px); padding: 88px 0; }
  .guide-section-wide { width: min(calc(100% - 36px), var(--frame)); }
  .section-heading { display: block; margin-bottom: 48px; }
  .section-heading h2 { font-size: 48px; }
  .section-heading > p:last-child { margin-top: 28px; font-size: 14px; }
  .step-list li { grid-template-columns: 56px 1fr; gap: 14px; padding: 26px 0; }
  .step-number { font-size: 23px; }
  .step-list h3 { font-size: 18px; }
  .step-list p { font-size: 13px; }
  .atelier-note { grid-template-columns: 1fr; gap: 8px; }
  .type-grid { grid-template-columns: repeat(2, 1fr); }
  .type-grid article { min-height: 210px; padding: 22px 18px; }
  .type-grid h3 { margin-top: 26px; font-size: 16px; }
  .safety-note { grid-template-columns: 1fr; gap: 20px; padding: 28px 24px; }
  .prompt-template { margin: 42px 0 58px; }
  .prompt-template-head { gap: 20px; }
  .prompt-template-head span:last-child { text-align: right; }
  .prompt-template blockquote { padding: 28px 24px; font-size: 17px; }
  .example-list { grid-template-columns: 1fr; }
  .example-list article { padding: 30px 24px; }
  .guide-section-dark { width: 100%; padding: 88px 18px; }
  .workflow-list li { grid-template-columns: 50px 1fr; gap: 15px; }
  .save-rule { grid-template-columns: 1fr; }
  .save-rule-arrow { padding: 0 0 4px; transform: rotate(90deg); }
  .command-table { min-width: 660px; }
  .limits-grid { grid-template-columns: 1fr; }
  .limits-grid > div + div { border-top: 1px solid var(--rule); border-left: 0; }
  .guide-cta { padding: 88px 18px; }
  .guide-footer { padding: 34px 18px 100px; }
}

@media (max-width: 410px) {
  .type-grid { grid-template-columns: 1fr; }
  .type-grid article { min-height: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}