:root {
  --bg: #f7f6f3;
  --surface: #fbfaf8;
  --surface-strong: #f0efeb;
  --text: #161616;
  --text-soft: #4f5963;
  --text-faint: #7a8591;
  --line: rgba(28, 38, 48, 0.14);
  --accent: #60758d;
  --accent-strong: #45586c;
  --max-width: 1100px;
  --reading-width: 720px;
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --sans: "Avenir Next", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-strong);
  text-decoration: none;
}

a:hover,
a:focus {
  color: var(--text);
}

img {
  max-width: 100%;
  display: block;
}

.site-shell {
  min-height: 100vh;
}

.container {
  width: min(calc(100% - 120px), var(--max-width));
  margin: 0 auto;
}

.reading {
  width: min(100%, var(--reading-width));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(247, 246, 243, 0.86);
  border-bottom: 1px solid rgba(28, 38, 48, 0.08);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
}

.brand-mark {
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1;
  color: var(--text);
}

.brand-sub {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav a {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
}

.nav-group {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.lang-switch a {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.lang-switch a.active,
.lang-switch a:hover {
  color: var(--text);
}

.site-main {
  padding: 0 0 80px;
}

.hero {
  padding: 88px 0 42px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 760px);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent-strong);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero-title,
.page-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(46px, 6.5vw, 84px);
  line-height: 0.96;
  letter-spacing: -0.03em;
}

.page-title {
  font-size: clamp(36px, 5.4vw, 64px);
}

html[lang="zh-Hant"] .hero-title,
html[lang="zh-Hant"] .page-title {
  font-weight: 600;
  letter-spacing: -0.02em;
}

.hero-subtitle,
.page-subtitle {
  margin: 18px 0 0;
  width: min(100%, 560px);
  color: var(--text-soft);
  font-size: 17px;
}

.section {
  padding: 38px 0;
}

.section-label {
  margin: 0 0 20px;
  color: var(--text-faint);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.manifesto {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 16px;
}

.manifesto li {
  padding: 0 0 16px;
  border-bottom: 1px solid var(--line);
  font-family: var(--sans);
  font-size: clamp(19px, 2.1vw, 26px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  font-weight: 500;
}

.evidence-list,
.path-list,
.footer-links,
.detail-list,
.channel-list,
.stack-list {
  display: grid;
  gap: 18px;
}

.evidence-item,
.path-item,
.feature-block,
.detail-card,
.channel-card,
.product-card,
.publication-card,
.timeline-item {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.evidence-item:last-child,
.path-item:last-child,
.feature-block:last-child,
.detail-card:last-child,
.channel-card:last-child,
.product-card:last-child,
.publication-card:last-child,
.timeline-item:last-child {
  border-bottom: 1px solid var(--line);
}

.meta {
  margin: 0 0 6px;
  color: var(--text-faint);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.item-title,
.card-title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.card-title {
  font-size: clamp(24px, 2.5vw, 32px);
}

.item-body,
.card-body,
.prose,
.intro-text {
  margin: 10px 0 0;
  color: var(--text-soft);
  font-size: 16px;
}

.path-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 16px;
}

.path-link {
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.page-header {
  padding: 72px 0 24px;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.7fr);
  gap: 64px;
  align-items: start;
}

.sidebar-note {
  padding-top: 10px;
}

.sidebar-note p,
.sidebar-note li {
  color: var(--text-soft);
  font-size: 15px;
}

.sidebar-note ul {
  padding-left: 18px;
  margin: 14px 0 0;
}

.split-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 40px;
}

.product-family {
  display: grid;
  gap: 28px;
}

.product-lockup {
  display: flex;
  align-items: center;
  gap: 18px;
}

.product-lockup img {
  width: 76px;
  height: 76px;
  border-radius: 18px;
  box-shadow: 0 12px 30px rgba(33, 43, 53, 0.12);
}

.product-wordmark {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.product-wordmark strong {
  font-family: var(--serif);
  font-size: 30px;
  line-height: 1;
  font-weight: 600;
}

.product-wordmark span {
  color: var(--text-faint);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 16px;
  border: 1px solid var(--line);
  color: var(--text);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.button:hover,
.button:focus {
  border-color: var(--accent);
  background: rgba(96, 117, 141, 0.08);
}

.button.primary {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: var(--surface);
}

.button.primary:hover,
.button.primary:focus {
  background: var(--text);
  border-color: var(--text);
  color: var(--surface);
}

.site-footer {
  padding: 24px 0 56px;
}

.site-footer-inner {
  display: grid;
  gap: 18px;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.footer-links {
  grid-template-columns: repeat(auto-fit, minmax(120px, max-content));
  gap: 10px 18px;
  justify-content: end;
  justify-items: end;
}

.footer-links a {
  font-size: 12px;
  letter-spacing: 0.05em;
}

.footer-meta {
  color: var(--text-faint);
  font-size: 13px;
}

.lede {
  color: var(--text-soft);
  font-size: 18px;
  max-width: 60ch;
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  background: rgba(96, 117, 141, 0.08);
  color: var(--accent-strong);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.spacious-list {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding-left: 18px;
}

.prose p {
  margin: 0 0 16px;
}

.prose p:last-child {
  margin-bottom: 0;
}

@media (max-width: 900px) {
  .two-column,
  .split-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .path-item {
    grid-template-columns: 1fr;
    align-items: start;
  }
}

@media (max-width: 700px) {
  .site-header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
    gap: 12px 16px;
  }

  .lang-switch {
    padding-left: 0;
    border-left: 0;
  }

  .hero {
    padding-top: 64px;
  }

  .container {
    width: min(calc(100% - 52px), var(--max-width));
  }

  .product-lockup {
    align-items: flex-start;
  }

  .footer-links {
    justify-content: start;
    justify-items: start;
  }
}