:root {
  --ink: #0d1b22;
  --ink-soft: #17323b;
  --paper: #edf3f1;
  --paper-soft: #dfe9e6;
  --paper-deep: #c7d8d3;
  --text: #12313a;
  --text-muted: #5c7678;
  --line: #b6cac5;
  --line-dark: rgba(237, 243, 241, 0.2);
  --signal: #46d0c1;
  --signal-deep: #1e9f98;
  --amber: #f2bd5d;
  --white: #f7fbfa;
  --sans: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Noto Serif TC", "Source Han Serif TC", "Songti TC", Georgia, serif;
  --mono: Consolas, "Cascadia Mono", ui-monospace, monospace;
  --wide: 76rem;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  overflow-wrap: break-word;
}
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--amber); outline-offset: 4px; }
.container { width: min(100% - 3rem, var(--wide)); margin-inline: auto; }
.skip-link { position: absolute; left: -9999px; top: 0; z-index: 20; padding: .65rem 1rem; background: var(--amber); color: var(--ink); }
.skip-link:focus { left: 0; }

.site-header { position: sticky; top: 0; z-index: 10; background: var(--ink); color: var(--white); border-bottom: 1px solid var(--line-dark); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 4.25rem; gap: 1.5rem; }
.brand { display: inline-flex; align-items: baseline; gap: .75rem; white-space: nowrap; }
.brand-mark { font-family: var(--serif); font-size: 1.08rem; letter-spacing: .08em; }
.brand-name { color: var(--signal); font-family: var(--mono); font-size: .8rem; letter-spacing: .12em; }
.site-nav { display: flex; align-items: center; gap: 1.4rem; font-size: .88rem; }
.site-nav a { color: rgba(247, 251, 250, .76); border-bottom: 1px solid transparent; padding: .2rem 0; }
.site-nav a:hover, .site-nav a.current { color: var(--white); border-bottom-color: var(--signal); }
.site-nav .nav-action { padding: .45rem .8rem; border: 1px solid var(--signal); color: var(--signal); }
.site-nav .nav-action:hover { background: var(--signal); color: var(--ink); }

.hero { background: var(--ink); color: var(--white); padding: clamp(4.5rem, 9vw, 8rem) 0 clamp(4rem, 8vw, 7rem); border-bottom: 1px solid var(--line-dark); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(20rem, .82fr); gap: clamp(3rem, 8vw, 8rem); align-items: start; }
.hero-copy { max-width: 44rem; }
.kicker, .section-kicker { margin: 0 0 1.35rem; color: var(--signal); font-family: var(--mono); font-size: .74rem; letter-spacing: .12em; }
.hero h1 { max-width: 10ch; margin: 0; font-family: var(--serif); font-size: clamp(3rem, 7vw, 6.8rem); font-weight: 500; line-height: 1.08; letter-spacing: -.04em; }
.hero-lede { max-width: 32rem; margin: 2.25rem 0 0; color: rgba(247, 251, 250, .76); font-size: clamp(1.05rem, 2vw, 1.3rem); line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: .9rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 3rem; padding: .7rem 1.15rem; border: 1px solid transparent; font-size: .94rem; font-weight: 700; line-height: 1.25; transition: background-color .15s ease, color .15s ease, border-color .15s ease; }
.button-primary { background: var(--signal); border-color: var(--signal); color: var(--ink); }
.button-primary:hover { background: var(--white); border-color: var(--white); }
.button-secondary { border-color: rgba(247, 251, 250, .42); color: var(--white); }
.button-secondary:hover { border-color: var(--signal); color: var(--signal); }
.hero-note { max-width: 37rem; margin: 1.4rem 0 0; color: rgba(247, 251, 250, .5); font-size: .82rem; line-height: 1.7; }

.status-board { border: 1px solid rgba(247, 251, 250, .27); background: var(--ink-soft); }
.status-board-head { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.1rem; border-bottom: 1px solid var(--line-dark); color: var(--white); font-family: var(--mono); font-size: .76rem; letter-spacing: .07em; }
.signal-dot { width: .55rem; height: .55rem; background: var(--signal); border-radius: 50%; }
.status-chip { padding: .15rem .35rem; border: 1px solid var(--amber); color: var(--amber); font-family: var(--mono); font-size: .66rem; letter-spacing: .08em; }
.status-row { display: grid; grid-template-columns: 1fr 1fr auto; gap: .8rem; align-items: center; padding: 1rem 1.1rem; border-bottom: 1px solid var(--line-dark); }
.status-row:hover { background: rgba(70, 208, 193, .08); }
.status-row-static:hover { background: transparent; }
.status-label { color: var(--white); font-size: .92rem; }
.status-value { color: var(--signal); font-size: .82rem; text-align: right; }
.status-value-muted { color: var(--amber); }
.status-arrow { color: rgba(247, 251, 250, .45); font-size: 1.1rem; }
.status-footnote { margin: 0; padding: 1rem 1.1rem 1.15rem; color: rgba(247, 251, 250, .55); font-size: .8rem; line-height: 1.7; }

.section { padding: clamp(4rem, 8vw, 7rem) 0; }
.section-paper { background: var(--paper); }
.section-ink { background: var(--ink); color: var(--white); }
.section-last { padding-bottom: clamp(4.5rem, 9vw, 8rem); }
.section-heading { max-width: 43rem; margin-bottom: 2.4rem; }
.section-heading h2, .boundary-grid h2, .start-strip h2 { max-width: 14ch; margin: 0; font-family: var(--serif); font-size: clamp(2rem, 4vw, 4rem); font-weight: 500; line-height: 1.15; letter-spacing: -.03em; }
.section-kicker { color: var(--signal-deep); }
.section-kicker-light { color: var(--signal); }
.route-list { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.route-item { min-height: 19rem; display: flex; flex-direction: column; padding: 1.45rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.route-item:hover { background: var(--paper-soft); }
.route-index { color: var(--signal-deep); font-family: var(--mono); font-size: .7rem; letter-spacing: .1em; }
.route-title { margin-top: 3.4rem; font-family: var(--serif); font-size: 1.8rem; line-height: 1.3; }
.route-copy { max-width: 23rem; margin-top: .65rem; color: var(--text-muted); font-size: .94rem; line-height: 1.7; }
.route-link { margin-top: auto; padding-top: 1.4rem; color: var(--signal-deep); font-size: .88rem; font-weight: 700; }
.route-link span, .text-link span { padding-left: .25rem; }

.boundary-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(3rem, 9vw, 9rem); align-items: start; }
.boundary-copy { max-width: 38rem; color: rgba(247, 251, 250, .75); }
.boundary-copy p { margin: 0 0 1.1rem; }
.boundary-copy p:last-child { margin-bottom: 0; }
.measurement-note { padding-top: 1.1rem; border-top: 1px solid var(--line-dark); color: var(--amber) !important; font-family: var(--mono); font-size: .78rem; }
.boundary-list { margin: 0; padding: 0; list-style: none; }
.boundary-list li { padding: .95rem 0 .95rem 1.5rem; border-bottom: 1px solid var(--line-dark); position: relative; }
.boundary-list li::before { content: ""; position: absolute; left: 0; top: 1.7rem; width: .45rem; height: .45rem; background: var(--amber); }
.scope-grid { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(3rem, 9vw, 9rem); align-items: start; }
.scope-list { border-top: 1px solid var(--line); }
.scope-row { display: grid; grid-template-columns: 3rem 1fr; gap: 1rem; padding: 1.2rem 0; border-bottom: 1px solid var(--line); }
.scope-mark { color: var(--signal-deep); font-family: var(--mono); font-size: .78rem; }
.scope-row strong { font-size: 1.05rem; }
.scope-row p { margin: .3rem 0 0; color: var(--text-muted); font-size: .92rem; }
.start-strip { display: flex; align-items: end; justify-content: space-between; gap: 2rem; }
.start-strip .hero-actions { margin-top: 0; }
.text-link { color: var(--signal-deep); font-weight: 700; border-bottom: 1px solid var(--signal-deep); padding-bottom: .2rem; }
.text-link:hover { color: var(--text); border-bottom-color: var(--text); }

.site-footer { background: var(--paper-deep); color: var(--text); padding: 2.3rem 0; }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 1.2rem 3rem; align-items: start; }
.footer-brand { font-family: var(--serif); font-size: 1.05rem; }
.footer-inner p { margin: .25rem 0 0; color: var(--text-muted); font-size: .82rem; }
.footer-nav { display: flex; gap: 1.3rem; font-size: .84rem; }
.footer-nav a:hover { color: var(--signal-deep); }
.footer-meta { grid-column: 1 / -1; padding-top: 1rem; border-top: 1px solid rgba(18, 49, 58, .18); font-family: var(--mono); font-size: .7rem !important; }

@media (max-width: 58rem) {
  .hero-grid, .boundary-grid, .scope-grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero h1 { max-width: 12ch; }
  .route-list { grid-template-columns: 1fr; }
  .route-item { min-height: 0; }
  .route-title { margin-top: 2.2rem; }
  .start-strip { align-items: start; flex-direction: column; }
}
@media (max-width: 38rem) {
  .container { width: min(100% - 2rem, var(--wide)); }
  .header-inner { min-height: 3.8rem; }
  .brand { gap: .45rem; }
  .brand-mark { font-size: .95rem; }
  .brand-name { font-size: .68rem; }
  .site-nav { gap: .8rem; font-size: .78rem; }
  .site-nav .nav-action { padding: .35rem .5rem; }
  .hero h1 { font-size: clamp(2.8rem, 14vw, 4.5rem); }
  .status-row { grid-template-columns: 1fr auto; }
  .status-value { grid-column: 1; grid-row: 2; text-align: left; }
  .status-arrow { grid-column: 2; grid-row: 1 / span 2; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-nav { grid-row: 2; flex-wrap: wrap; }
  .footer-meta { grid-column: 1; }
}