:root {
  --bg-primary: #0A1128;
  --bg-card: #101C3A;
  --accent-gold: #F0B90B;
  --accent-red: #B3242A;
  --text-primary: #E5E7EB;
  --text-secondary: #9CA3AF;
  --border: #1F3A5F;
  --data-blue: #3B82F6;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --track-width: 76px;
  --content-max: 1200px;
  --radius: 10px;
  --transition: 200ms ease;
}

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

html {
  background: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  margin-left: var(--track-width);
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.2;
  margin: 0 0 0.8em;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--accent-gold);
}

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

:focus-visible {
  outline: 2px solid var(--accent-gold);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1200;
  display: inline-block;
  padding: 0.7rem 1.2rem;
  background: var(--accent-gold);
  color: var(--bg-primary);
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 0.8rem;
  text-decoration: none;
  border-radius: 0 0 8px 0;
}

.skip-link:focus {
  left: 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 1100;
  background: linear-gradient(90deg, var(--accent-gold), var(--accent-red));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

.brand-track {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--track-width);
  height: 100vh;
  z-index: 900;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem 0;
  background:
    linear-gradient(rgba(59, 130, 246, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.08) 1px, transparent 1px),
    linear-gradient(180deg, rgba(16, 28, 58, 0.85), rgba(10, 17, 40, 0.3));
  background-size: 18px 18px, 18px 18px, auto;
  border-right: 1px solid var(--border);
  pointer-events: none;
}

.brand-track__index,
.brand-track__coord {
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-secondary);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.brand-track__index {
  color: var(--accent-gold);
}

.brand-track__rule {
  position: relative;
  flex: 1;
  width: 1px;
  margin: 0.9rem 0;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(240, 185, 11, 0.7), rgba(31, 58, 95, 0.5));
}

.brand-track__rule::after {
  content: "";
  position: absolute;
  top: -30%;
  left: 0;
  width: 100%;
  height: 30%;
  background: var(--data-blue);
  animation: data-flow 3.2s linear infinite;
}

@keyframes data-flow {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(340%);
  }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 17, 40, 0.96);
  border-bottom: 1px solid var(--border);
  box-shadow:
    0 1px 0 rgba(240, 185, 11, 0.2),
    0 18px 40px rgba(0, 0, 0, 0.35);
}

.site-header__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 2rem;
}

.site-header__bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 0 0.9rem;
}

.site-header__brand-wrap {
  justify-self: center;
  min-width: 0;
}

.site-header__corner {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
}

.site-header__corner--right {
  justify-self: end;
}

.header-coord {
  font-size: 0.68rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--text-secondary);
  white-space: nowrap;
}

.header-coord::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 0.5rem;
  background: var(--data-blue);
  transform: rotate(45deg);
  vertical-align: middle;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.site-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.2rem;
  height: 2.2rem;
  background: var(--accent-gold);
  color: var(--bg-primary);
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: -0.02em;
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(240, 185, 11, 0.25);
}

.site-brand__meta {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.site-brand__cn {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: 0.1em;
  color: var(--text-primary);
}

.site-brand__en {
  margin-top: 3px;
  font-size: 0.6rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--text-secondary);
  white-space: nowrap;
}

.online-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.38rem 0.9rem;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  white-space: nowrap;
}

.online-status__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-gold);
  animation: status-pulse 2.2s ease-out infinite;
}

@keyframes status-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(240, 185, 11, 0.55);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(240, 185, 11, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(240, 185, 11, 0);
  }
}

.online-status__text {
  font-family: var(--font-mono);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 38px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0;
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color 180ms ease, color 180ms ease;
}

.nav-toggle:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.nav-toggle__box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 17px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform 220ms ease, opacity 180ms ease;
}

.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-nav {
  border-top: 1px solid var(--border);
}

.site-nav__list {
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__item {
  display: flex;
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  padding: 0.8rem 1.1rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -1px;
  width: 0;
  height: 2px;
  background: var(--accent-gold);
  transition: width 240ms ease, left 240ms ease;
}

.site-nav__link:hover {
  color: var(--text-primary);
}

.site-nav__link:hover::after {
  width: 100%;
  left: 0;
}

.site-nav__link[aria-current="page"] {
  color: var(--accent-gold);
}

.site-nav__link[aria-current="page"]::after {
  width: 100%;
  left: 0;
  background: var(--accent-gold);
}

.site-footer {
  margin-top: 4rem;
  background:
    linear-gradient(180deg, transparent, rgba(59, 130, 246, 0.05)),
    var(--bg-card);
  border-top: 1px solid var(--border);
}

.site-footer__grid {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 4rem 2rem 3rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr;
  gap: 3rem 4rem;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
}

.site-footer__brand .site-brand {
  margin-bottom: 1.2rem;
}

.site-footer__desc {
  max-width: 30em;
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.site-footer__links,
.site-footer__contact {
  min-width: 0;
}

.site-footer__title {
  position: relative;
  margin: 0 0 1.1rem;
  padding-left: 0.9rem;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 0.84rem;
  letter-spacing: 0.16em;
  color: var(--text-primary);
}

.site-footer__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  width: 3px;
  height: 1.1em;
  background: var(--accent-gold);
  border-radius: 2px;
}

.site-footer__link-list,
.site-footer__contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.site-footer__link-list a,
.site-footer__contact-list a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 160ms ease, padding-left 160ms ease;
}

.site-footer__link-list a:hover,
.site-footer__contact-list a:hover {
  color: var(--accent-gold);
}

.site-footer__link-list a:hover {
  padding-left: 4px;
}

.site-footer__contact-list li {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.site-footer__contact-list li::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  background: var(--accent-red);
  transform: translateY(-2px) rotate(45deg);
}

.site-footer__bottom {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1.5rem 2rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.site-footer__icp {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.site-brand--footer .site-brand__cn {
  font-size: 1.2rem;
}

.site-brand--footer .site-brand__mark {
  min-width: 1.9rem;
  height: 1.9rem;
  font-size: 0.85rem;
}

.back-to-top {
  position: fixed;
  right: 1.75rem;
  bottom: 1.75rem;
  z-index: 950;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 9px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--accent-gold);
  font-size: 1.05rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 200ms ease, visibility 200ms ease, transform 200ms ease, border-color 200ms ease;
}

.back-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  border-color: var(--accent-gold);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 2rem;
}

.section {
  padding: 3.5rem 0;
}

.section--tight {
  padding: 2rem 0;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent-gold);
}

.section-label::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--accent-gold);
}

.section-title {
  margin-bottom: 1.5rem;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 2.4rem;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.5rem;
}

.grid__span-3 { grid-column: span 3; }
.grid__span-4 { grid-column: span 4; }
.grid__span-6 { grid-column: span 6; }
.grid__span-8 { grid-column: span 8; }
.grid__span-12 { grid-column: span 12; }

.card {
  position: relative;
  padding: 1.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 200ms ease, box-shadow 200ms ease, transform 200ms ease;
}

.card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-gold), transparent 70%);
  opacity: 0;
  transition: opacity 200ms ease;
}

.card:hover {
  border-color: rgba(240, 185, 11, 0.42);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.32);
  transform: translateY(-3px);
}

.card:hover::before {
  opacity: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  cursor: pointer;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.btn:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--accent-gold);
  border-color: var(--accent-gold);
  color: var(--bg-primary);
}

.btn--primary:hover {
  background: #ffc928;
  border-color: #ffc928;
  color: var(--bg-primary);
}

.btn--ghost {
  border-color: var(--border);
  color: var(--text-secondary);
}

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

.btn--danger {
  border-color: var(--accent-red);
  color: var(--accent-red);
}

.btn--danger:hover {
  background: var(--accent-red);
  border-color: var(--accent-red);
  color: #ffffff;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 2.2rem;
  padding: 0;
  list-style: none;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb li + li::before {
  content: "→";
  color: var(--border);
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 160ms ease;
}

.breadcrumb a:hover {
  color: var(--accent-gold);
}

.breadcrumb [aria-current="page"] {
  color: var(--accent-gold);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 560ms ease, transform 560ms ease;
}

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

@media (max-width: 960px) {
  :root {
    --track-width: 0px;
  }

  body {
    margin-left: 0;
  }

  .brand-track {
    display: none;
  }

  .header-coord {
    display: none;
  }

  .site-footer__grid {
    gap: 2rem 2.5rem;
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    padding: 0 1.25rem;
  }

  .site-header__bar {
    padding: 0.9rem 0 0.75rem;
  }

  .site-header__corner--left {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-top: 0;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.45);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 260ms ease, opacity 180ms ease;
  }

  .site-nav[data-open] {
    max-height: 480px;
    opacity: 1;
  }

  .site-nav__list {
    flex-direction: column;
    padding: 0.75rem 0;
  }

  .site-nav__item {
    display: block;
  }

  .site-nav__link {
    padding: 0.85rem 1.5rem;
    font-size: 0.95rem;
    border-left: 3px solid transparent;
  }

  .site-nav__link::after {
    display: none;
  }

  .site-nav__link[aria-current="page"] {
    color: var(--accent-gold);
    background: rgba(240, 185, 11, 0.06);
    border-left-color: var(--accent-gold);
  }

  .online-status__text {
    display: none;
  }

  .online-status {
    padding: 0.45rem;
  }

  .site-footer {
    margin-top: 2.5rem;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    padding: 3rem 1.25rem 2rem;
    gap: 2.25rem;
  }

  .site-footer__bottom {
    padding: 1.25rem;
    flex-direction: column-reverse;
    align-items: flex-start;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .grid__span-3,
  .grid__span-4,
  .grid__span-6,
  .grid__span-8,
  .grid__span-12 {
    grid-column: span 1;
  }

  .back-to-top {
    right: 1.25rem;
    bottom: 1.25rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}