*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --c-deep: #0A1428;
  --c-electric: #1B3A6B;
  --c-gold: #D4AF37;
  --c-red: #E63946;
  --c-ice: #EAF3FF;
  --c-mist: #8A9BB5;
  --c-border: #2A4B7C;
  --c-amber: #F2B705;
  --c-green: #27AE60;
  --c-footer: #050D1A;
  --font-display: "Rajdhani", "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1.5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-ice);
  background:
    radial-gradient(ellipse 90% 45% at 50% -10%, rgba(27,58,107,0.45), transparent),
    var(--c-deep);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul, ol {
  padding-left: 1.25rem;
}

:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: 3px;
  border-radius: 6px;
}

#main-content {
  display: block;
  min-height: 60vh;
}

.container {
  width: min(100% - 2rem, 1200px);
  margin-inline: auto;
}

.grid-bg {
  background-image:
    linear-gradient(rgba(42,75,124,0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,75,124,0.16) 1px, transparent 1px);
  background-size: 32px 32px;
}

.grid-cols-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-cols-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.grid-cols-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-ice);
  background: var(--c-electric);
  text-decoration: none;
  cursor: pointer;
  line-height: 1.4;
  transition: background-color 0.25s ease, border-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}

.btn:hover {
  border-color: var(--c-gold);
  color: var(--c-gold);
  background: rgba(212,175,55,0.1);
}

.btn-gold {
  background: linear-gradient(135deg, var(--c-gold), var(--c-amber));
  border: none;
  color: var(--c-deep);
  font-weight: 700;
}

.btn-gold:hover {
  background: linear-gradient(135deg, var(--c-amber), var(--c-gold));
  color: var(--c-deep);
  box-shadow: 0 4px 20px rgba(242,183,5,0.35);
}

.btn-outline {
  background: transparent;
  border-color: var(--c-border);
  color: var(--c-ice);
}

.btn-outline:hover {
  border-color: var(--c-gold);
  color: var(--c-gold);
  background: rgba(212,175,55,0.06);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--c-mist);
}

.btn-ghost:hover {
  color: var(--c-ice);
  background: rgba(42,75,124,0.2);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.22rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.5;
  border: 1px solid transparent;
  white-space: nowrap;
}

.badge-gold {
  background: rgba(212,175,55,0.12);
  border-color: rgba(212,175,55,0.4);
  color: var(--c-gold);
}

.badge-red {
  background: rgba(230,57,70,0.12);
  border-color: rgba(230,57,70,0.4);
  color: #ff7e86;
}

.badge-green {
  background: rgba(39,174,96,0.12);
  border-color: rgba(39,174,96,0.4);
  color: var(--c-green);
}

.badge-blue {
  background: rgba(42,75,124,0.2);
  border-color: var(--c-border);
  color: var(--c-ice);
}

.page-head {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 2.5rem;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--c-ice);
  margin-bottom: 0.75rem;
}

.page-desc {
  font-size: 1.0625rem;
  color: var(--c-mist);
  max-width: 56ch;
}

.hero {
  position: relative;
  padding: 4rem 0;
  overflow: hidden;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--c-ice);
}

.hero-sub {
  margin-top: 1rem;
  font-size: 1.125rem;
  color: var(--c-mist);
  max-width: 46ch;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  font-size: 0.8125rem;
  color: var(--c-mist);
}

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

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--c-border);
}

.breadcrumb a {
  color: var(--c-mist);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

.section-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.375rem 0.875rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--c-border);
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--c-gold);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--c-ice);
}

.section-desc {
  margin-left: auto;
  max-width: 28rem;
  font-size: 0.9375rem;
  color: var(--c-mist);
}

.prose {
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-ice);
}

.prose p {
  margin-bottom: 1.125rem;
}

.prose h2 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 800;
  margin: 2.25rem 0 0.75rem;
  letter-spacing: 0.02em;
  color: var(--c-ice);
}

.prose h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 1.75rem 0 0.5rem;
  color: var(--c-ice);
}

.prose ul,
.prose ol {
  margin: 0 0 1.125rem 1.25rem;
}

.prose a {
  color: var(--c-gold);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: var(--c-amber);
}

.prose blockquote {
  border-left: 3px solid var(--c-gold);
  padding-left: 1.25rem;
  margin: 1.5rem 0;
  color: var(--c-mist);
  font-style: italic;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: rgba(42,75,124,0.25);
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.prose th,
.prose td {
  border: 1px solid var(--c-border);
  padding: 0.6rem 0.85rem;
  text-align: left;
}

.prose th {
  background: var(--c-electric);
  color: var(--c-ice);
  font-weight: 700;
}

.card {
  background: linear-gradient(145deg, rgba(27,58,107,0.5), rgba(27,58,107,0.25));
  border: 1px solid var(--c-border);
  border-radius: 24px;
  padding: 1.5rem;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  border-color: var(--c-gold);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.35);
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-ice);
  margin-bottom: 0.5rem;
}

.card-text {
  font-size: 0.9375rem;
  color: var(--c-mist);
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.stat-block {
  background: var(--c-electric);
  border: 1px solid var(--c-border);
  border-radius: 20px;
  padding: 1.25rem;
  text-align: center;
}

.stat-number {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-gold);
}

.stat-label {
  display: block;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-mist);
  margin-top: 0.375rem;
}

.img-frame {
  position: relative;
  display: block;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--c-border);
  background: linear-gradient(135deg, rgba(42,75,124,0.25), rgba(10,20,40,0.5));
}

.img-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.img-frame > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame-ratio-4-3::before {
  padding-top: 75%;
}

.img-frame-ratio-1-1::before {
  padding-top: 100%;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 1100;
  padding: 0.6rem 1.25rem;
  border-radius: 999px;
  background: var(--c-gold);
  color: var(--c-deep);
  font-weight: 700;
  font-size: 0.875rem;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: relative;
  background-image:
    linear-gradient(rgba(42,75,124,0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42,75,124,0.1) 1px, transparent 1px),
    linear-gradient(180deg, #0D1C36 0%, var(--c-deep) 100%);
  background-size: 32px 32px, 32px 32px, auto;
  border-bottom: 1px solid var(--c-border);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-red));
  transform: scaleX(0);
  transform-origin: 0 0;
  pointer-events: none;
  transition: none;
}

.header-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  padding: 0.4rem 1rem;
  border-bottom: 1px solid var(--c-border);
  background: rgba(5,13,26,0.6);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--c-mist);
  white-space: nowrap;
}

.meta-sync {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--c-green);
}

.meta-tag {
  display: none;
  color: var(--c-gold);
}

.dot-green {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-green);
  box-shadow: 0 0 8px rgba(39,174,96,0.55);
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.875rem 1rem;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  text-decoration: none;
  color: inherit;
}

.brand-en {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--c-mist);
  line-height: 1.4;
}

.brand-cn {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.06em;
  color: var(--c-ice);
}

.brand-tag {
  display: inline-block;
  margin-top: 0.15rem;
  padding: 0.08rem 0.5rem;
  border-radius: 999px;
  border: 1px solid rgba(212,175,55,0.4);
  background: rgba(212,175,55,0.1);
  color: var(--c-gold);
  font-size: 0.5625rem;
  letter-spacing: 0.16em;
  line-height: 1.5;
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: 14px;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

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

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-ice);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-box .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-box .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-toggle-label {
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--c-mist);
  line-height: 1.2;
}

.main-nav {
  display: none;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  background: rgba(5,13,26,0.75);
}

.main-nav[data-open] {
  display: block;
}

.nav-inner {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  width: 100%;
  padding: 0 1rem 1rem;
}

.nav-list {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.nav-link {
  display: block;
  width: 100%;
  padding: 0.875rem 0.5rem;
  border: none;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--c-mist);
  text-align: center;
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover {
  color: var(--c-ice);
  background: rgba(42,75,124,0.18);
}

.nav-link[aria-current="page"] {
  color: var(--c-gold);
  background: rgba(212,175,55,0.08);
}

.header-cta {
  width: 100%;
  padding: 0.75rem 1.25rem;
  font-size: 0.8125rem;
}

.site-footer {
  position: relative;
  background: var(--c-footer);
  border-top: 1px solid var(--c-border);
  color: var(--c-mist);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-gold), var(--c-red), transparent);
}

.footer-inner {
  padding: 3rem 1rem 2rem;
}

.footer-brand-row {
  text-align: center;
  margin-bottom: 2.25rem;
}

.footer-brand-link {
  display: inline-block;
  text-decoration: none;
  color: inherit;
}

.footer-brand {
  display: block;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  line-height: 1.2;
  color: var(--c-ice);
  transition: color 0.2s ease;
}

.footer-brand-link:hover .footer-brand {
  color: var(--c-gold);
}

.footer-brand-en {
  display: block;
  margin-top: 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--c-mist);
}

.footer-tagline {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--c-gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 2rem 0;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.footer-label {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-ice);
  margin-bottom: 0.875rem;
}

.footer-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer-link {
  color: var(--c-mist);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--c-gold);
}

.footer-contact {
  font-size: 0.875rem;
  line-height: 1.7;
  margin-bottom: 0.35rem;
}

.footer-service {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--c-border);
  font-size: 0.8125rem;
  color: var(--c-gold);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding-top: 1.5rem;
  font-size: 0.8125rem;
  color: var(--c-mist);
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.footer-trust {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--c-border);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--c-mist);
  text-align: center;
}

.to-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--c-border);
  border-radius: 999px;
  background: rgba(10,20,40,0.92);
  color: var(--c-mist);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

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

.to-top:hover,
.to-top:focus-visible {
  border-color: var(--c-gold);
  color: var(--c-gold);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 768px) {
  .header-meta {
    justify-content: space-between;
    padding: 0.5rem 1.5rem;
  }

  .meta-tag {
    display: inline;
  }

  .header-main {
    flex-direction: column;
    justify-content: center;
    gap: 0.5rem;
    padding: 2rem 1rem 1.5rem;
  }

  .brand {
    align-items: center;
  }

  .brand-en {
    font-size: 0.8125rem;
  }

  .brand-cn {
    font-size: clamp(2.2rem, 4.5vw, 3.75rem);
  }

  .brand-tag {
    margin-top: 0.4rem;
    font-size: 0.6875rem;
    padding: 0.12rem 0.65rem;
  }

  .nav-toggle {
    display: none;
  }

  .main-nav {
    display: block;
  }

  .nav-inner {
    flex-direction: row;
    align-items: center;
    justify-content: center;
    width: min(100% - 2rem, 1200px);
    margin-inline: auto;
    padding: 0;
  }

  .nav-list {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.25rem;
  }

  .nav-item + .nav-item {
    border-top: none;
  }

  .nav-link {
    width: auto;
    padding: 0.7rem 1.15rem;
    border: 1px solid transparent;
    border-radius: 999px;
  }

  .nav-link[aria-current="page"] {
    border-color: rgba(212,175,55,0.45);
  }

  .header-cta {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: auto;
  }

  .footer-inner {
    padding: 3.5rem 1rem 2.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr 1.4fr;
    gap: 2.5rem;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    gap: 3rem;
  }
}

@media (max-width: 1023px) {
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 639px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

@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;
    scroll-behavior: auto !important;
  }
}