:root {
  --color-bg: #0B1D3A;
  --color-card: #112240;
  --color-card-deep: #0D2040;
  --color-text: #E8ECEF;
  --color-text-secondary: #A0B0C0;
  --color-line: #2C3E50;
  --color-action: #FF6B35;
  --color-gold: #F5B731;
  --color-gold-light: #FFD75E;
  --color-success: #2ECC71;
  --color-info: #3498DB;
  --font-heading: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", Georgia, serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
  --transition-fast: 0.25s;
  --max-width: 1440px;
}

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

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body.is-locked {
  overflow: hidden;
}

h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote {
  margin: 0;
  padding: 0;
}

ul, ol {
  list-style: none;
}

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

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

button {
  font: inherit;
  cursor: pointer;
}

a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--color-gold-light);
  outline-offset: 3px;
}

::selection {
  background: var(--color-gold);
  color: var(--color-bg);
}

#main-content:focus {
  outline: none;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 96px;
  z-index: 3000;
  background: var(--color-gold-light);
  color: var(--color-bg);
  padding: 8px 14px;
  font-weight: 700;
  border-radius: 0;
  transform: translateY(-200%);
  transition: transform var(--transition-fast) ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  background: transparent;
  z-index: 1500;
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--color-gold), var(--color-action));
  transform-origin: 0 50%;
  transform: scaleX(var(--scroll, 0));
}

.site-header {
  position: sticky;
  top: 0;
  background: rgba(11, 29, 58, 0.88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
  z-index: 1000;
}

.header-shell {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 24px 0 112px;
  max-width: var(--max-width);
  margin: 0 auto;
  min-height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-light) 100%);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  border-radius: 0;
  box-shadow: 0 0 0 1px rgba(255, 215, 94, 0.4);
}

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 80px;
  height: 100vh;
  background: var(--color-card-deep);
  border-right: 1px solid var(--color-line);
  padding: 96px 8px 32px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 8px;
  z-index: 1100;
  transition: transform var(--transition-fast) ease;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-item {
  display: flex;
}

.nav-link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 10px 4px;
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  border-left: 2px solid transparent;
  text-align: center;
  letter-spacing: 0.04em;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-gold);
  opacity: 0.7;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-text);
  background: rgba(245, 183, 49, 0.08);
  border-left-color: var(--color-gold);
}

.nav-link[aria-current="page"] {
  color: var(--color-gold-light);
  border-left-color: var(--color-action);
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.15) 0%, transparent 60%);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 0;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  line-height: 1.2;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-action {
  background: var(--color-action);
  color: var(--color-bg);
  border-color: transparent;
  font-weight: 700;
}

.btn-action:hover {
  background: #FF7D4D;
  box-shadow: 0 6px 16px rgba(255, 107, 53, 0.25);
}

.header-login {
  margin-left: auto;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 10px;
  color: var(--color-text);
  border-radius: 0;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-footer {
  background: #071226;
  border-top: 1px solid var(--color-line);
  color: var(--color-text-secondary);
}

.footer-panel {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 32px;
}

.footer-brand .brand {
  margin-bottom: 16px;
}

.footer-tagline {
  max-width: 32rem;
  margin-top: 12px;
  font-size: 0.95rem;
  line-height: 1.7;
}

.footer-trust {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--color-card);
  border-left: 3px solid var(--color-gold);
  font-size: 0.85rem;
  color: var(--color-text);
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  position: relative;
  padding-left: 12px;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-links a::before {
  content: "/";
  position: absolute;
  left: 0;
  color: var(--color-gold);
  font-family: var(--font-mono);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-text);
  padding-left: 16px;
}

.contact-list li {
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.contact-address {
  max-width: 20rem;
}

.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--color-line);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.stack-panel {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-gold);
  padding: 32px;
  margin-bottom: 24px;
  position: relative;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.panel-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gold);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.panel-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.15;
  color: var(--color-text);
  margin-top: 8px;
}

.grid {
  display: grid;
  gap: 24px;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 24px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25);
}

.data-card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-right: 3px solid var(--color-gold);
  padding: 20px;
}

.data-metric {
  font-family: var(--font-mono);
  font-size: 2rem;
  color: var(--color-gold-light);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: rgba(245, 183, 49, 0.12);
  border: 1px solid rgba(245, 183, 49, 0.4);
  color: var(--color-gold-light);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  border-radius: 0;
}

.breadcrumbs {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  padding: 24px 0;
}

.breadcrumbs a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--color-gold-light);
}

.breadcrumbs .current {
  color: var(--color-text);
}

.divider {
  height: 1px;
  background: var(--color-line);
  border: 0;
  margin: 24px 0;
}

.media {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  overflow: hidden;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 29, 58, 0.18) 0%, transparent 40%);
  pointer-events: none;
}

.media--tall {
  aspect-ratio: 4 / 5;
}

.media--wide {
  aspect-ratio: 21 / 9;
}

.media--square {
  aspect-ratio: 1 / 1;
}

.media-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 160px;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}

html.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 899px) {
  .site-nav {
    width: min(320px, 82vw);
    transform: translateX(-100%);
    padding: 80px 20px 24px;
  }

  .site-nav[data-open] {
    transform: none;
    box-shadow: 12px 0 32px rgba(0, 0, 0, 0.4);
  }

  .nav-list {
    flex-direction: column;
  }

  .nav-link {
    flex-direction: row;
    justify-content: flex-start;
    gap: 12px;
    padding: 12px 16px;
    border-left: 0;
    border-bottom: 1px solid var(--color-line);
    font-size: 0.9rem;
  }

  .nav-link[aria-current="page"] {
    border-left: 0;
    border-bottom: 2px solid var(--color-action);
    background: linear-gradient(90deg, rgba(255, 107, 53, 0.15) 0%, transparent 60%);
  }

  .nav-index {
    width: 24px;
  }

  .header-shell {
    padding-left: 16px;
    min-height: 56px;
  }

  .nav-toggle {
    display: flex;
    margin-left: 12px;
  }

  .header-login {
    margin-left: auto;
  }

  .skip-link {
    left: 8px;
    top: 8px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

@media (max-width: 599px) {
  .header-shell {
    gap: 8px;
    padding: 0 12px;
  }

  .brand-text {
    font-size: 1rem;
  }

  .header-login {
    padding: 8px 10px;
    font-size: 0.8rem;
  }

  .section {
    padding: 48px 0;
  }

  .stack-panel {
    padding: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }

  .skip-link,
  .site-nav,
  .nav-toggle-bar,
  .btn,
  .card,
  .footer-links a {
    transition: none !important;
  }

  html.has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}