:root {
  --navy: #0b2545;
  --navy-deep: #07182e;
  --navy-mid: #14375c;
  --gold: #c9a35a;
  --gold-soft: #e4c98a;
  --ink: #1a2332;
  --muted: #5c6773;
  --line: #d8d4cc;
  --paper: #f4f1ea;
  --white: #fdfcf9;
  --header-h: 72px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", "STSong", serif;
  --shadow: 0 18px 40px rgba(11, 37, 69, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -40px;
  z-index: 100;
  background: var(--gold);
  color: var(--navy);
  padding: 8px 12px;
}

.skip-link:focus {
  top: 12px;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: rgba(253, 252, 249, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.logo-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.logo-zh {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--navy);
}

.logo-en {
  margin-top: 3px;
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  position: relative;
  color: var(--navy-mid);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.site-nav a:hover,
.site-nav a.is-current {
  color: var(--navy);
}

.site-nav a.is-current::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  background: var(--gold);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--navy);
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle span::before {
  top: -6px;
}

.nav-toggle span::after {
  top: 6px;
}

/* Hero */

.hero {
  position: relative;
  background: linear-gradient(160deg, var(--navy-deep) 0%, var(--navy) 48%, var(--navy-mid) 100%);
  color: var(--white);
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent 0, transparent 48%, rgba(201, 163, 90, 0.08) 48.2%, transparent 48.4%),
    repeating-linear-gradient(
      -18deg,
      transparent,
      transparent 28px,
      rgba(255, 255, 255, 0.02) 28px,
      rgba(255, 255, 255, 0.02) 29px
    );
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding: 96px 0 88px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--gold-soft);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--gold);
}

.hero h1,
.page-hero h1 {
  margin: 18px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.25;
}

.hero h1 {
  max-width: 16em;
  font-size: clamp(32px, 5vw, 52px);
}

.hero-lead {
  max-width: 36em;
  margin: 22px 0 0;
  color: rgba(253, 252, 249, 0.78);
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 2px;
  font-size: 14px;
  letter-spacing: 0.08em;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-gold {
  background: var(--gold);
  color: var(--navy-deep);
}

.btn-gold:hover {
  background: var(--gold-soft);
}

.btn-ghost {
  border: 1px solid rgba(201, 163, 90, 0.55);
  color: var(--gold-soft);
}

.btn-ghost:hover {
  border-color: var(--gold);
  color: var(--white);
}

.btn-navy {
  background: var(--navy);
  color: var(--white);
}

.btn-navy:hover {
  background: var(--navy-mid);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 72px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(201, 163, 90, 0.25);
}

.hero-stats div {
  padding: 22px 24px;
  background: rgba(7, 24, 46, 0.35);
}

.hero-stats strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 28px;
  letter-spacing: 0.06em;
  color: var(--gold-soft);
}

.hero-stats span {
  display: block;
  margin-top: 4px;
  color: rgba(253, 252, 249, 0.65);
  font-size: 13px;
}

/* Page hero */

.page-hero {
  background: var(--navy);
  color: var(--white);
  padding: 64px 0 56px;
}

.page-hero p {
  max-width: 40em;
  margin: 14px 0 0;
  color: rgba(253, 252, 249, 0.72);
}

/* Sections */

main {
  flex: 1;
}

.section {
  padding: 80px 0;
}

.section-paper {
  background: var(--paper);
}

.section-head {
  max-width: 40em;
  margin-bottom: 40px;
}

.section-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(26px, 3vw, 34px);
  letter-spacing: 0.08em;
  color: var(--navy);
}

.section-head p {
  margin: 12px 0 0;
  color: var(--muted);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 28px 26px 30px;
  box-shadow: var(--shadow);
}

.card h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 20px;
  letter-spacing: 0.08em;
  color: var(--navy);
}

.card p {
  margin: 0;
  color: var(--muted);
}

.card-index {
  display: block;
  margin-bottom: 16px;
  color: var(--gold);
  font-size: 12px;
  letter-spacing: 0.2em;
}

.prose {
  max-width: 46em;
}

.prose p + p {
  margin-top: 16px;
}

.facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 32px;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.facts dt {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.facts dd {
  margin: 4px 0 0;
  color: var(--navy);
  font-weight: 600;
}

.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: start;
}

.panel {
  background: var(--navy);
  color: var(--white);
  padding: 36px 32px;
}

.panel h3 {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  letter-spacing: 0.08em;
}

.panel p,
.panel li {
  color: rgba(253, 252, 249, 0.78);
}

.panel ul {
  margin: 0;
  padding-left: 1.1em;
}

.panel li + li {
  margin-top: 8px;
}

.cta-band {
  background: var(--navy-deep);
  color: var(--white);
  padding: 56px 0;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.cta-inner h2 {
  margin: 0;
  font-family: var(--font-serif);
  letter-spacing: 0.08em;
}

.cta-inner p {
  margin: 8px 0 0;
  color: rgba(253, 252, 249, 0.7);
}

.contact-list {
  display: grid;
  gap: 18px;
}

.contact-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.contact-item dt {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.contact-item dd {
  margin: 6px 0 0;
  font-size: 20px;
  color: var(--navy);
}

.contact-item a:hover {
  color: var(--gold);
}

.error-page {
  text-align: center;
  padding: 100px 0 120px;
}

.error-page .code {
  font-family: var(--font-serif);
  font-size: 72px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.error-page h1 {
  margin: 8px 0 12px;
  font-family: var(--font-serif);
  color: var(--navy);
}

.error-page p {
  margin: 0 auto 28px;
  max-width: 28em;
  color: var(--muted);
}

/* Footer */

.site-footer {
  background: var(--navy-deep);
  color: rgba(253, 252, 249, 0.72);
  padding: 36px 0 28px;
  border-top: 3px solid var(--gold);
  font-size: 13px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
}

.site-footer a {
  color: var(--gold-soft);
}

.site-footer a:hover {
  color: var(--white);
}

/* Responsive */

@media (max-width: 860px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 20px 16px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a.is-current::after {
    display: none;
  }

  .hero-stats,
  .grid-3,
  .split,
  .facts,
  .cta-inner {
    grid-template-columns: 1fr;
    display: grid;
  }

  .hero-inner {
    padding: 64px 0 56px;
  }

  .section {
    padding: 56px 0;
  }

  .cta-inner {
    justify-items: start;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(1120px, calc(100% - 28px));
  }

  .hero-stats {
    margin-top: 40px;
  }

  .hero-stats strong {
    font-size: 22px;
  }
}