:root {
  --ink: #111418;
  --ink-soft: #4d5963;
  --surface: #ffffff;
  --subtle: #f3f6f7;
  --line: #d7e0e4;
  --accent: #06bcc7;
  --accent-dark: #007d85;
  --gold: #ba9136;
  --max-width: 1180px;
  --gutter: clamp(22px, 4vw, 56px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Segoe UI", sans-serif;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
.section-shell { width: min(100%, var(--max-width)); margin: 0 auto; padding-inline: var(--gutter); }
.site-header {
  position: sticky; top: 0; z-index: 10; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  min-height: 70px; padding: 12px var(--gutter); border-bottom: 1px solid rgba(215, 224, 228, .8); background: rgba(255,255,255,.94); backdrop-filter: blur(14px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 750; }
.brand img { width: 26px; height: 26px; object-fit: contain; }
nav { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 650; }
nav a:hover, .text-link:hover { color: var(--accent-dark); }
.header-download { justify-self: end; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 19px; border: 1px solid transparent; border-radius: 8px; font-size: 15px; font-weight: 750; transition: transform .18s ease, background .18s ease, border-color .18s ease; }
.button:hover { transform: translateY(-1px); }
.button-primary { color: #fff; background: var(--accent); }
.button-primary:hover { background: #00a8b3; }
.button-secondary { color: var(--ink); border-color: var(--line); background: #fff; }
.button-secondary:hover { border-color: var(--accent); }
.button[aria-disabled="true"] { cursor: not-allowed; opacity: .55; pointer-events: none; }
.hero { display: grid; grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr); align-items: center; gap: clamp(28px, 6vw, 72px); min-height: 690px; padding-top: 64px; padding-bottom: 54px; }
.hero h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 600px; margin-bottom: 22px; font-size: clamp(42px, 5.1vw, 74px); line-height: 1.08; letter-spacing: 0; }
.hero-lede { max-width: 510px; margin-bottom: 28px; color: var(--ink-soft); font-size: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-facts { display: grid; gap: 10px; margin: 28px 0 0; padding: 0; list-style: none; color: var(--ink-soft); font-size: 14px; }
.hero-facts li::before { content: ""; display: inline-block; width: 9px; height: 9px; margin-right: 10px; border-radius: 50%; background: var(--accent); }
.hero-media { margin: 0; }
.hero-media img { display: block; width: 100%; min-height: 370px; object-fit: contain; }
.workflow-band, .evidence-band { border-block: 1px solid var(--line); background: var(--subtle); }
.workflow-band { padding-block: 84px; }
.section-label { margin-bottom: 10px; color: var(--accent-dark); font-size: 14px; font-weight: 800; }
h2 { margin-bottom: 34px; font-size: clamp(30px, 3.2vw, 46px); line-height: 1.15; letter-spacing: 0; }
.workflow-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.workflow-grid article { min-height: 208px; padding: 28px 28px 20px 0; border-right: 1px solid var(--line); }
.workflow-grid article + article { padding-left: 28px; }
.workflow-grid article:last-child { border-right: 0; }
.workflow-grid span { color: var(--accent-dark); font-size: 14px; font-weight: 800; }
.workflow-grid h3 { margin: 10px 0; font-size: 26px; }
.workflow-grid p, .split-section p, .release-summary { color: var(--ink-soft); }
.split-section { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: 72px; padding-top: 110px; padding-bottom: 110px; }
.split-section h2 { margin-bottom: 20px; }
.boundary-list { margin: 0; border-top: 1px solid var(--line); }
.boundary-list div { padding: 22px 0; border-bottom: 1px solid var(--line); }
.boundary-list dt { margin-bottom: 7px; color: var(--accent-dark); font-weight: 800; }
.boundary-list dd { margin: 0; color: var(--ink-soft); }
.evidence-band { padding-block: 80px; background: var(--ink); color: #fff; }
.evidence-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; }
.evidence-layout h2 { margin-bottom: 0; }
.evidence-list { border-top: 1px solid rgba(255,255,255,.28); }
.evidence-list p { margin: 0; padding: 18px 0; border-bottom: 1px solid rgba(255,255,255,.28); color: rgba(255,255,255,.76); }
.evidence-list strong { display: inline-block; width: 76px; color: #fff; }
.download-section { display: flex; align-items: center; justify-content: space-between; gap: 48px; padding-top: 110px; padding-bottom: 110px; }
.download-section h2 { margin-bottom: 16px; }
.release-summary { max-width: 510px; margin-bottom: 0; }
.download-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 12px; }
.text-link { color: var(--accent-dark); font-size: 14px; font-weight: 750; }
.site-footer { display: flex; justify-content: space-between; gap: 18px; padding: 24px var(--gutter); border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 13px; }
@media (max-width: 800px) {
  .site-header { grid-template-columns: 1fr auto; min-height: 62px; }
  nav { display: none; }
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 50px; }
  .hero-media { order: -1; }
  .hero-media img { min-height: 0; }
  .workflow-grid, .split-section, .evidence-layout { grid-template-columns: 1fr; }
  .workflow-grid article, .workflow-grid article + article { min-height: 0; padding: 24px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .workflow-grid article:last-child { border-bottom: 0; }
  .split-section, .evidence-layout { gap: 38px; padding-top: 72px; padding-bottom: 72px; }
  .download-section { display: block; padding-top: 72px; padding-bottom: 72px; }
  .download-actions { justify-content: flex-start; margin-top: 28px; }
  .site-footer { flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .button { transition: none; } }