:root {
  --ink: #1d2a27;
  --ink-soft: #52645f;
  --paper: #f6f1e7;
  --paper-2: #fffaf0;
  --sage: #dfe8df;
  --line: rgba(29, 42, 39, 0.14);
  --line-strong: rgba(29, 42, 39, 0.24);
  --atlas: #295f57;
  --atlas-dark: #123b36;
  --clay: #a96843;
  --gold: #c49448;
  --shadow: 0 18px 50px rgba(29, 42, 39, 0.10);
  --display: "Yu Mincho", "Noto Serif TC", "PMingLiU", serif;
  --body: "Microsoft JhengHei", "PingFang TC", "Noto Sans TC", sans-serif;
  --mono: "Cascadia Code", "SFMono-Regular", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(29,42,39,.045) 1px, transparent 1px),
    linear-gradient(0deg, rgba(29,42,39,.035) 1px, transparent 1px),
    radial-gradient(circle at 8% 0%, rgba(196,148,72,.16), transparent 34rem),
    var(--paper);
  background-size: 44px 44px, 44px 44px, auto, auto;
  font-family: var(--body);
  line-height: 1.75;
}

a { color: inherit; }
.site-header {
  position: sticky; top: 0; z-index: 20;
  display: flex; justify-content: space-between; align-items: center; gap: 24px;
  padding: 14px clamp(18px, 4vw, 58px);
  background: rgba(246, 241, 231, .88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 900; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: #fffaf0; background: var(--atlas); border-radius: 10px; font-family: var(--display); }
.top-nav { display: flex; flex-wrap: wrap; gap: 16px; color: var(--ink-soft); font-size: .94rem; }
.top-nav a { text-decoration: none; border-bottom: 1px solid transparent; }
.top-nav a:hover, .top-nav a:focus-visible { color: var(--atlas-dark); border-color: var(--gold); outline: none; }

.hero {
  display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(320px, .82fr); gap: clamp(26px, 5vw, 72px);
  align-items: center; min-height: 78vh;
  padding: clamp(58px, 8vw, 112px) clamp(18px, 5vw, 76px) clamp(42px, 7vw, 82px);
}
.eyebrow { margin: 0 0 12px; color: var(--clay); font-size: .78rem; font-weight: 900; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3 { margin: 0; font-family: var(--display); line-height: 1.12; }
h1 { max-width: 930px; font-size: clamp(3rem, 7.6vw, 7rem); letter-spacing: -.05em; text-wrap: balance; }
h2 { font-size: clamp(2rem, 4vw, 4rem); letter-spacing: -.035em; }
h3 { font-size: clamp(1.2rem, 2vw, 1.55rem); }
.hero-description { max-width: 760px; margin: 28px 0 0; color: var(--ink-soft); font-size: clamp(1.06rem, 1.7vw, 1.24rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 10px 18px; border: 1px solid var(--atlas); border-radius: 999px; text-decoration: none; font-weight: 900; transition: transform .16s ease, box-shadow .16s ease; }
.button.primary { color: #fffaf0; background: var(--atlas); box-shadow: 0 16px 36px rgba(41,95,87,.18); }
.button.secondary { color: var(--atlas-dark); background: rgba(255,255,255,.42); }
.button:hover, .button:focus-visible { transform: translateY(-2px); box-shadow: var(--shadow); outline: none; }

.brief-card, .quote-card, .route-card, .key-card, .concept-card, .method-card, .role-card, .faq-list details, .source-card {
  background: rgba(255,250,240,.70); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow);
}
.brief-card { padding: 28px; }
.card-kicker { display: inline-flex; margin-bottom: 14px; color: var(--clay); font-size: .78rem; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
.brief-card p { margin: 0; color: var(--ink); font-size: 1.08rem; }
.brief-metrics { display: grid; gap: 10px; margin: 24px 0 0; }
.brief-metrics div { display: flex; justify-content: space-between; gap: 16px; padding-top: 10px; border-top: 1px solid var(--line); }
.brief-metrics dt { color: var(--ink-soft); } .brief-metrics dd { margin: 0; font-weight: 900; }

.section { padding: clamp(56px, 8vw, 96px) clamp(18px, 5vw, 76px); }
.section-heading { max-width: 920px; margin-bottom: 30px; }
.section-heading p:not(.eyebrow) { color: var(--ink-soft); }
.route-section { background: linear-gradient(180deg, rgba(255,250,240,.52), rgba(223,232,223,.42)); border-block: 1px solid var(--line); }
.route-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.route-card { display: grid; align-content: start; min-height: 230px; padding: 22px; text-decoration: none; }
.route-card span, .key-card span, .phase { color: var(--gold); font-family: var(--mono); font-weight: 900; }
.route-card h3 { margin-top: 22px; } .route-card p { color: var(--ink-soft); }
.key-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 14px; }
.key-card { min-height: 218px; padding: 22px; }
.key-card p { margin: 28px 0 0; }

.split { display: grid; grid-template-columns: minmax(260px, .72fr) minmax(0, 1.28fr); gap: 44px; }
.sticky-heading { position: sticky; top: 92px; align-self: start; }
.concept-stack { display: grid; gap: 18px; }
.concept-card, .method-card { padding: 28px; }
.concept-card p, .method-card p { color: var(--ink-soft); }
ul { padding-left: 1.2rem; }
.comparison-grid { display: grid; gap: 10px; margin-top: 18px; }
.comparison-row { display: grid; grid-template-columns: .8fr 1fr 1fr; gap: 12px; padding: 12px; border: 1px solid var(--line); border-radius: 12px; background: rgba(246,241,231,.68); }

.mothership { color: var(--paper-2); background: linear-gradient(135deg, var(--atlas-dark), #1d2a27); }
.mothership .eyebrow, .mothership .section-heading p { color: #e9c174; }
.mothership-layout { display: grid; grid-template-columns: minmax(0,.9fr) minmax(320px,1.1fr); gap: 22px; }
.quote-card, .role-card { color: var(--paper-2); background: rgba(255,250,240,.08); border-color: rgba(255,250,240,.18); }
.quote-card { padding: 28px; }
.quote-card blockquote { margin: 22px 0 0; padding: 18px; border-left: 4px solid #e9c174; background: rgba(0,0,0,.16); }
.flow-lane { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; }
.flow-step { min-height: 164px; padding: 18px; border: 1px solid rgba(255,250,240,.18); border-radius: 16px; background: rgba(255,250,240,.08); }
.flow-step strong { display: block; color: #e9c174; margin-bottom: 28px; }
.role-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-top: 24px; }
.role-card { padding: 22px; }
.role-card .metaphor { color: #e9c174; font-weight: 900; }
.benefit-table { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 1px; margin-top: 24px; overflow: hidden; border: 1px solid rgba(255,250,240,.18); border-radius: 16px; }
.benefit-row { padding: 18px; background: rgba(255,250,240,.08); }
.benefit-row strong { display: block; color: #e9c174; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,250,240,.68); box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; min-width: 880px; }
th, td { padding: 14px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
th { color: var(--atlas-dark); background: rgba(223,232,223,.65); font-size: .86rem; }
.method-grid, .workflow-grid, .source-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.method-card { display: grid; gap: 12px; }
.tag { width: fit-content; padding: 5px 9px; border-radius: 999px; color: var(--atlas-dark); background: var(--sage); font-weight: 900; font-size: .82rem; }
.timeline { display: grid; gap: 14px; padding: 0; list-style: none; counter-reset: phase; }
.timeline li { display: grid; grid-template-columns: 130px 1fr; gap: 18px; padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,250,240,.68); }
.code-section { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; background: #172622; color: var(--paper-2); }
pre { margin: 18px 0 0; overflow: auto; padding: 18px; border: 1px solid rgba(255,250,240,.16); border-radius: 16px; background: rgba(0,0,0,.22); }
code { font-family: var(--mono); font-size: .9rem; }
.workflow-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.workflow-step { min-height: 150px; padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,250,240,.68); }
.workflow-step span { color: var(--gold); font-family: var(--mono); font-weight: 900; }
.faq-list { display: grid; gap: 12px; }
.faq-list details { padding: 18px 20px; }
.faq-list summary { cursor: pointer; font-weight: 900; }
.faq-list p { color: var(--ink-soft); }
.source-card { padding: 18px; text-decoration: none; word-break: break-word; }
.source-card span { color: var(--ink-soft); font-size: .88rem; }
.site-footer { display: flex; justify-content: space-between; gap: 18px; padding: 24px clamp(18px,5vw,76px); border-top: 1px solid var(--line); color: var(--ink-soft); }

@media (max-width: 1080px) {
  .hero, .split, .mothership-layout, .code-section { grid-template-columns: 1fr; }
  .key-grid, .route-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .method-grid, .workflow-grid, .source-list, .role-grid, .benefit-table, .flow-lane { grid-template-columns: 1fr; }
  .sticky-heading { position: static; }
}
@media (max-width: 680px) {
  .site-header, .site-footer { align-items: flex-start; flex-direction: column; }
  .top-nav { gap: 10px; }
  .hero { min-height: auto; }
  h1 { font-size: clamp(2.6rem, 14vw, 4rem); }
  .key-grid, .route-grid, .comparison-row, .timeline li { grid-template-columns: 1fr; }
}