:root {
  --color-bg: #0B0E14;
  --color-bg-alt: #101B2D;
  --color-gold: #D4AF37;
  --color-amber: #FFB347;
  --color-cyan: #00D4FF;
  --color-text: #F5F7FA;
  --color-muted: #7A8BA6;
  --glass: rgba(255,255,255,0.08);
  --line: rgba(245,247,250,0.1);
  --font-display: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-editorial: "Noto Serif SC", "Source Han Serif SC", serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --radius-lg: 18px;
  --radius-md: 10px;
  --shadow: 0 10px 30px rgba(0,0,0,0.22);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 85% -10%, rgba(0,212,255,0.08), transparent 34%),
    radial-gradient(circle at 10% 20%, rgba(212,175,55,0.07), transparent 28%),
    linear-gradient(rgba(245,247,250,0.024) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245,247,250,0.024) 1px, transparent 1px),
    var(--color-bg);
  background-size: auto, auto, 44px 44px, 44px 44px, auto;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p, ul, ol { margin: 0; }

h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h2 {
  font-family: var(--font-editorial);
  font-weight: 400;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.15;
  color: var(--color-text);
}

h3 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.4rem;
  line-height: 1.3;
  color: var(--color-text);
}

a { color: inherit; }
button { font: inherit; }

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

::selection {
  background: rgba(212,175,55,0.35);
  color: #0B0E14;
}

:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

body.nav-open {
  overflow: hidden;
}

.container {
  width: calc(100% - 2rem);
  max-width: 1320px;
  margin-inline: auto;
}

.container-narrow {
  width: min(720px, calc(100% - 2rem));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 300;
  transform: translateY(-120%);
  background: var(--color-gold);
  color: #0B0E14;
  padding: 0.7rem 1.1rem;
  border-radius: 0 0 0.5rem 0;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s ease;
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-cyan));
  box-shadow: 0 0 14px rgba(0,212,255,0.55);
  z-index: 220;
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11,14,20,0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 4px 20px rgba(0,0,0,0.22);
}

.header-topbar {
  background: rgba(11,14,20,0.68);
  border-bottom: 1px solid rgba(245,247,250,0.06);
}

.header-topbar-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  padding-block: 0.45rem;
}

.update-note {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-muted);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-cyan);
  box-shadow: 0 0 0 4px rgba(0,212,255,0.14), 0 0 12px rgba(0,212,255,0.8);
  animation: statusPulse 2.4s ease-in-out infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.84); }
}

.topbar-links {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
}

.topbar-link {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.topbar-divider {
  color: rgba(245,247,250,0.25);
}

.header-main {
  border-bottom: 1px solid rgba(245,247,250,0.06);
}

.header-main-inner {
  display: flex;
  align-items: center;
  min-height: 66px;
  gap: 0.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex-shrink: 0;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(212,175,55,0.18), rgba(0,212,255,0.06));
  border: 1px solid rgba(212,175,55,0.38);
}

.brand-mark::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--color-gold);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(212,175,55,0.16), 0 0 16px rgba(212,175,55,0.65);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 9px;
  border: 1px dashed rgba(0,212,255,0.25);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  line-height: 1.15;
  color: var(--color-text);
}

.brand-sub {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.56rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  width: min(86vw, 400px);
  margin: 0;
  padding: 1.25rem;
  background: rgba(8,10,16,0.98);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-left: 1px solid rgba(212,175,55,0.3);
  box-shadow: -18px 0 40px rgba(0,0,0,0.36);
  z-index: 140;
  overflow-y: auto;
  visibility: hidden;
  transform: translateX(100%);
  transition: transform 0.3s ease, visibility 0.3s ease;
}

.site-nav[data-open] {
  visibility: visible;
  transform: translateX(0);
}

.nav-close {
  align-self: flex-end;
  display: inline-flex;
  background: transparent;
  border: 1px solid rgba(245,247,250,0.22);
  color: var(--color-text);
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

.nav-list {
  display: flex;
  flex-direction: column;
  list-style: none;
  padding: 0;
  margin: 1.2rem 0 0;
  border-top: 1px solid rgba(245,247,250,0.08);
}

.nav-link {
  position: relative;
  display: block;
  padding: 0.9rem 0.1rem;
  border-bottom: 1px solid rgba(245,247,250,0.06);
  color: var(--color-text);
  font-size: 1rem;
  text-decoration: none;
  transition: color 0.25s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-cyan));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

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

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

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

.header-actions {
  display: flex;
  align-items: center;
}

.btn-header {
  display: none;
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0;
  background: rgba(245,247,250,0.04);
  border: 1px solid rgba(245,247,250,0.12);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.nav-toggle:hover {
  border-color: rgba(212,175,55,0.45);
  background: rgba(212,175,55,0.06);
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, background 0.2s ease;
}

.nav-toggle:hover .nav-toggle-line {
  background: var(--color-gold);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

.section {
  padding-block: clamp(3rem, 7vw, 6rem);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin-bottom: 2rem;
  border-left: 2px solid var(--color-gold);
  padding-left: 1.1rem;
}

.section-index {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.section-title {
  font-family: var(--font-editorial);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.15;
  color: var(--color-text);
}

.section-desc {
  max-width: 58ch;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.page-hero {
  position: relative;
  padding: clamp(3rem, 7vw, 6rem) 0 1.5rem;
}

.page-hero::before {
  content: "";
  position: absolute;
  right: 2%;
  top: 8%;
  width: 190px;
  height: 190px;
  background: radial-gradient(circle, rgba(0,212,255,0.09), transparent 70%);
  pointer-events: none;
}

.page-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold), rgba(0,212,255,0.4), transparent);
}

.page-hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--color-text);
  max-width: 12em;
}

.page-hero-meta {
  margin-top: 0.75rem;
  color: var(--color-muted);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}

.lead {
  font-family: var(--font-editorial);
  font-size: 1.18rem;
  line-height: 1.75;
  color: var(--color-muted);
}

.text-muted {
  color: var(--color-muted);
}

.prose {
  max-width: 72ch;
  color: var(--color-text);
  line-height: 1.8;
}

.prose p {
  margin-bottom: 1.1rem;
}

.prose strong {
  color: var(--color-gold);
  font-weight: 600;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.25rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gold), var(--color-amber));
  color: #14171F;
  box-shadow: 0 0 0 1px rgba(212,175,55,0.3), 0 8px 24px rgba(212,175,55,0.16);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(212,175,55,0.28);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: rgba(245,247,250,0.04);
  color: var(--color-text);
  border-color: rgba(245,247,250,0.18);
}

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

.btn-header {
  padding: 0.5rem 1rem;
  font-size: 0.82rem;
}

.card-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

.card {
  position: relative;
  padding: 1.5rem;
  background: linear-gradient(145deg, rgba(255,255,255,0.07), rgba(255,255,255,0.03));
  border: 1px solid rgba(245,247,250,0.08);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 10% 0%, rgba(212,175,55,0.08), transparent 32%);
  pointer-events: none;
}

.card:hover {
  border-color: rgba(212,175,55,0.4);
  transform: translateY(-3px);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.7rem;
  border: 1px solid rgba(245,247,250,0.16);
  border-radius: 999px;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-text);
  background: rgba(245,247,250,0.04);
}

.tag::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-cyan);
  box-shadow: 0 0 8px var(--color-cyan);
}

.image-panel {
  position: relative;
  min-height: 240px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(245,247,250,0.1);
  background:
    linear-gradient(135deg, rgba(0,212,255,0.07), transparent 30%),
    linear-gradient(315deg, rgba(212,175,55,0.08), transparent 35%),
    rgba(16,27,45,0.72);
  display: grid;
  place-items: center;
}

.image-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(245,247,250,0.05), transparent 30%),
    repeating-linear-gradient(90deg, rgba(245,247,250,0.03) 0 1px, transparent 1px 28px);
}

.image-panel::after {
  content: attr(data-caption);
  position: absolute;
  left: 0.85rem;
  bottom: 0.85rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-text);
  background: rgba(11,14,20,0.66);
  padding: 0.18rem 0.5rem;
  border-radius: 999px;
}

.image-panel[data-caption=""]::after,
.image-panel:not([data-caption])::after {
  display: none;
}

.image-panel > * {
  position: relative;
  z-index: 1;
}

.metric {
  padding: 1.25rem;
  border-left: 1px solid rgba(212,175,55,0.4);
  background: linear-gradient(90deg, rgba(212,175,55,0.07), transparent 70%);
}

.metric-value {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1;
  color: var(--color-text);
}

.metric-value small {
  font-size: 0.6em;
  color: var(--color-gold);
}

.metric-label {
  margin-top: 0.5rem;
  color: var(--color-muted);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.index-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
}

.index-item {
  border: 1px solid rgba(245,247,250,0.08);
  border-radius: 14px;
  background: rgba(245,247,250,0.03);
}

.index-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
}

.index-link::before {
  content: attr(data-index);
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--color-gold);
  border: 1px solid rgba(212,175,55,0.4);
  border-radius: 50%;
}

.index-link:hover {
  background: rgba(212,175,55,0.06);
  color: var(--color-amber);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  font-size: 0.82rem;
  color: var(--color-muted);
}

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

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

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: rgba(245,247,250,0.25);
}

.site-footer {
  position: relative;
  margin-top: clamp(4rem, 8vw, 7rem);
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 0%, rgba(212,175,55,0.08), transparent 32%),
    radial-gradient(circle at 80% 0%, rgba(0,212,255,0.05), transparent 32%),
    linear-gradient(rgba(245,247,250,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245,247,250,0.022) 1px, transparent 1px);
  background-size: auto, auto, 40px 40px, 40px 40px;
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(212,175,55,0.5), rgba(0,212,255,0.5), transparent);
}

.footer-trust {
  position: relative;
  border-bottom: 1px solid rgba(245,247,250,0.06);
}

.footer-trust-statement {
  position: relative;
  max-width: 940px;
  margin: 0 auto;
  padding: 1.35rem 0;
  text-align: center;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text);
}

.footer-trust-statement strong {
  color: var(--color-gold);
  font-weight: 600;
}

.footer-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 2.6rem 0 2.2rem;
}

.footer-brand .brand {
  margin-bottom: 0.85rem;
}

.footer-about {
  max-width: 34ch;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-col {
  position: relative;
}

.footer-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 1.2rem;
}

.footer-title::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--color-gold);
  box-shadow: 0 0 8px rgba(212,175,55,0.6);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.footer-links a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.25s ease;
}

.footer-links a:hover {
  color: var(--color-amber);
}

.footer-contact {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  display: grid;
  gap: 0.8rem;
  color: var(--color-text);
  font-size: 0.9rem;
  line-height: 1.4;
}

.footer-contact-label {
  display: block;
  margin-bottom: 0.15rem;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.footer-service-note {
  border-left: 2px solid var(--color-gold);
  padding-left: 0.7rem;
  color: var(--color-muted);
  font-size: 0.8rem;
  line-height: 1.6;
}

.footer-bottom {
  position: relative;
  border-top: 1px solid rgba(245,247,250,0.06);
}

.footer-bottom-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 1.2rem 0;
  text-align: center;
}

.footer-copyright,
.footer-icp {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.footer-icp {
  letter-spacing: 0.08em;
}

@media (min-width: 680px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (min-width: 1080px) {
  .header-topbar-inner {
    flex-direction: row;
    justify-content: space-between;
    min-height: 38px;
    padding-block: 0;
  }

  .header-main-inner {
    min-height: 76px;
    gap: 1rem;
  }

  .site-nav {
    position: static;
    width: auto;
    margin-left: auto;
    padding: 0;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-left: 0;
    box-shadow: none;
    overflow: visible;
    visibility: visible;
    transform: none;
    flex-direction: row;
    align-items: center;
  }

  .nav-list {
    flex-direction: row;
    align-items: center;
    gap: clamp(1rem, 2.4vw, 2rem);
    margin: 0;
    border-top: 0;
  }

  .nav-link {
    display: block;
    padding: 0.6rem 0.05rem;
    border-bottom: 0;
    font-size: 0.95rem;
  }

  .nav-close {
    display: none;
  }

  .header-actions {
    margin-left: 1.5rem;
  }

  .btn-header {
    display: inline-flex;
  }

  .nav-toggle {
    display: none;
  }

  .section-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .section-desc {
    margin-left: auto;
    text-align: right;
  }

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

  .footer-grid {
    grid-template-columns: 1.7fr 1fr 1fr 1.4fr;
    gap: 2.5rem;
    padding: 3.5rem 0 2.8rem;
  }

  .footer-bottom-inner {
    flex-direction: row;
    text-align: left;
  }
}

@media (min-width: 1200px) {
  .header-main-inner {
    gap: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}