:root {
  --bg: #0B1020;
  --surface: #121826;
  --surface-2: #1C2438;
  --ink: #E8EDF7;
  --muted: #9AA7C2;
  --line: #C9D2E3;
  --line-dim: rgba(201, 210, 227, 0.18);
  --cyan: #2FF3D6;
  --orange: #FF8A3D;
  --blue: #4C6FFF;
  --deep: #062A2A;
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "思源黑体", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --dur: 180ms;
  --max: 1440px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
}
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { border-radius: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, h6, p, figure { margin: 0; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
::selection { background: var(--cyan); color: var(--bg); }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.05em;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 1000;
  padding: 10px 14px;
  background: var(--cyan);
  color: var(--bg);
  font-weight: 700;
  border: 1px solid var(--cyan);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(11, 16, 32, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-dim);
}
.header-frame {
  position: relative;
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  border-left: 1px solid var(--line-dim);
  border-right: 1px solid var(--line-dim);
}
.header-status {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 8px 18px;
  overflow-x: auto;
  white-space: nowrap;
  border-bottom: 1px solid var(--line-dim);
  color: var(--muted);
  font-size: 12px;
  scrollbar-width: none;
}
.header-status::-webkit-scrollbar { display: none; }
.status-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}
.status-item + .status-item { padding-left: 18px; border-left: 1px solid var(--line-dim); }
.status-label { color: var(--muted); }
.status-dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  display: inline-block;
  border: 1px solid var(--muted);
  background: var(--muted);
}
.status-dot[data-state="online"] {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 243, 214, 0.12);
}
.status-dot[data-state="updating"] {
  border-color: var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 138, 61, 0.12);
}
.status-dot[data-state="pending"] {
  border-color: var(--muted);
  background: transparent;
}
.header-main {
  display: grid;
  grid-template-columns: minmax(220px, 1.1fr) minmax(0, 2.2fr) auto;
  align-items: center;
  gap: 20px;
  padding: 14px 18px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.brand-mark {
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  color: var(--cyan);
  background: linear-gradient(145deg, rgba(47, 243, 214, 0.10), transparent 60%);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.brand-text {
  display: grid;
  min-width: 0;
  line-height: 1.15;
}
.brand-name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.brand-sub {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  border: 1px solid var(--line-dim);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}
.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  margin: 3px 0;
  background: var(--ink);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
.site-nav { min-width: 0; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-list::-webkit-scrollbar { display: none; }
.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 12px;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 6px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav-link:hover { color: var(--ink); }
.nav-link:hover::after,
.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--ink); }
.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 16px;
  background: var(--cyan);
  transform: translateY(-50%);
}
.header-cta { justify-self: end; }
.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
  background: transparent;
}
.progress-fill {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: transform 80ms linear;
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: var(--cyan); }
.btn-primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--bg);
  font-weight: 700;
}
.btn-primary:hover {
  background: #ff9d5c;
  border-color: #ff9d5c;
  color: var(--bg);
}
.btn-ghost { border-color: var(--line-dim); color: var(--ink); }
.btn-line { border-color: var(--cyan); color: var(--cyan); }

/* footer */
.site-footer {
  margin-top: 80px;
  background: var(--surface);
  border-top: 1px solid var(--line-dim);
  color: var(--muted);
}
.footer-grid {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 0.8fr) 1.3fr;
  gap: 32px;
  padding: 56px 0 36px;
}
.footer-brand { min-width: 0; }
.footer-brand-link { margin-bottom: 16px; }
.footer-note {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
}
.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  color: var(--ink);
  font-size: 13px;
}
.footer-title {
  margin-bottom: 14px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.10em;
}
.footer-links { display: grid; gap: 10px; }
.footer-links a {
  position: relative;
  display: inline-block;
  color: var(--muted);
  font-size: 14px;
}
.footer-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.footer-links a:hover { color: var(--ink); }
.footer-links a:hover::after { transform: scaleX(1); }
.footer-contact-list { display: grid; gap: 12px; }
.contact-item { display: grid; gap: 4px; }
.contact-label {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.contact-value {
  color: var(--ink);
  font-size: 14px;
  word-break: break-word;
}
.footer-bottom { border-top: 1px solid var(--line-dim); }
.footer-bottom-inner {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  padding: 18px 0;
  font-size: 13px;
}
.footer-meta { color: var(--muted); }
.footer-bottom-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.footer-bottom-nav a {
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}
.footer-bottom-nav a:hover { color: var(--cyan); }
.footer-legal {
  color: var(--muted);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.05em;
}
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 90;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--cyan);
  background: rgba(11, 16, 32, 0.92);
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 0.06em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* shared layout */
.container {
  width: min(100% - 32px, var(--max));
  margin-inline: auto;
}
.section { padding: clamp(48px, 7vw, 96px) 0; }
.section-head {
  display: grid;
  gap: 12px;
  max-width: 860px;
  margin-bottom: 32px;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  text-transform: uppercase;
}
.lede {
  max-width: 65ch;
  color: var(--muted);
  font-size: 17px;
}
.prose {
  max-width: 72ch;
  color: var(--ink);
}
.prose p + p { margin-top: 1em; }
.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(47, 243, 214, 0.45);
}
.grid {
  display: grid;
  gap: 20px;
}
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 20px;
}
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-12 { grid-column: span 12; }

/* breadcrumb */
.breadcrumb {
  padding: 18px 0 0;
  font-size: 13px;
  color: var(--muted);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 8px;
  color: var(--line-dim);
}
.breadcrumb a {
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--ink); }

/* data components */
.data-card {
  position: relative;
  padding: 20px;
  border: 1px solid var(--line-dim);
  background: var(--surface);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.data-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  opacity: 0.8;
}
.data-card:hover {
  transform: translateY(-2px);
  border-color: var(--line);
  background: var(--surface-2);
}
.stat-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  border: 1px solid var(--line-dim);
  background: var(--line-dim);
}
.stat {
  flex: 1 1 160px;
  padding: 14px 16px;
  background: var(--surface);
}
.stat-value {
  color: var(--ink);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  line-height: 1.2;
}
.stat-label {
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.scale-bar {
  position: relative;
  height: 6px;
  border: 1px solid var(--line-dim);
  background: var(--bg);
}
.scale-bar span {
  display: block;
  height: 100%;
  transform-origin: left;
  background: linear-gradient(90deg, var(--cyan), var(--blue));
}
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border: 1px solid var(--line-dim);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.tag[data-state="online"] {
  color: var(--cyan);
  border-color: rgba(47, 243, 214, 0.45);
  background: rgba(47, 243, 214, 0.06);
}
.tag[data-state="updating"] {
  color: var(--orange);
  border-color: rgba(255, 138, 61, 0.45);
  background: rgba(255, 138, 61, 0.06);
}
.tag[data-state="pending"] { color: var(--muted); }
.divider {
  height: 1px;
  border: 0;
  background: var(--line-dim);
}
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-dim);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.5;
}
th, td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-dim);
  text-align: left;
  white-space: nowrap;
}
th {
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0.06em;
}
tbody tr:nth-child(even) { background: var(--surface-2); }
tbody tr:last-child td { border-bottom: 0; }

/* media */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-dim);
  background: var(--surface-2);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 45%, rgba(11, 16, 32, 0.58));
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1; }
.media-frame--screen {
  aspect-ratio: 16 / 10;
  background: linear-gradient(135deg, var(--deep), var(--surface));
}
.media-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 16px;
}
.media-grid .media-frame { grid-column: span 4; }

/* motion */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 260ms var(--ease), transform 260ms var(--ease);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 1080px) {
  .header-main { grid-template-columns: minmax(200px, 1fr) minmax(0, 2fr) auto; }
  .footer-grid { grid-template-columns: 1.2fr repeat(2, 0.8fr) 1.2fr; }
  .footer-contact { grid-column: span 2; }
  .media-grid .media-frame { grid-column: span 6; }
}
@media (max-width: 980px) {
  .header-frame { width: min(100% - 20px, var(--max)); }
  .header-status {
    gap: 14px;
    padding: 7px 12px;
    font-size: 11px;
  }
  .status-item + .status-item { padding-left: 14px; }
  .header-main {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    padding: 12px;
  }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    grid-column: 1 / -1;
    display: none;
    padding-top: 8px;
    border-top: 1px solid var(--line-dim);
  }
  .site-nav[data-open="true"] { display: block; }
  .nav-list {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 6px;
  }
  .header-cta { display: none; }
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 24px;
    padding: 44px 0 28px;
  }
  .footer-contact { grid-column: auto; }
  .col-3, .col-4, .col-5 { grid-column: span 6; }
  .col-7, .col-8, .col-9, .col-10 { grid-column: span 12; }
}
@media (max-width: 640px) {
  body { font-size: 15px; }
  .brand-name { font-size: 15px; }
  .brand-sub { display: none; }
  .brand-mark { width: 36px; height: 36px; font-size: 13px; }
  .header-status { white-space: nowrap; }
  .header-status .status-item:last-child { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }
  .footer-bottom-nav { gap: 10px 14px; }
  .grid-12 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .col-2, .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-10 { grid-column: span 4; }
  .media-grid { grid-template-columns: 1fr; }
  .media-grid .media-frame { grid-column: span 1; }
  .back-to-top { right: 12px; bottom: 12px; }
}
@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;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .back-to-top { transition: none; }
}