:root {
  --bg-deep: #0a0e1a;
  --bg-panel: #101b2d;
  --bg-nested: #16233a;
  --color-primary: #00c8ff;
  --color-accent: #00ff9f;
  --color-warm: #ff7a00;
  --color-text: #e8edf7;
  --color-text-dim: #9aa8c1;
  --color-border: #2a3a55;
  --color-danger: #ff4d4f;
  --font-body: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-data: "Roboto Mono", "Courier New", Consolas, monospace;
  --container-width: 1320px;
  --header-h: 76px;
  --header-h-shrunk: 58px;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-glow: 0 0 18px rgba(0, 200, 255, 0.25);
}

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

* {
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--bg-deep);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
picture,
svg,
video {
  display: block;
  max-width: 100%;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

strong,
b {
  font-weight: 700;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Avenir Next", "Helvetica Neue", Arial, var(--font-body);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: var(--color-text);
  text-wrap: balance;
}

h1 {
  font-size: clamp(36px, 6vw, 60px);
}

h2 {
  font-size: clamp(28px, 4vw, 44px);
}

h3 {
  font-size: clamp(22px, 3vw, 30px);
}

h4 {
  font-size: 20px;
}

h5 {
  font-size: 18px;
}

p {
  margin-bottom: 1em;
}

small {
  font-size: 0.875rem;
}

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

.container-narrow {
  max-width: 900px;
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: 64px;
}

.section-tight {
  padding-block: 28px;
}

.section-head {
  display: grid;
  gap: 10px;
  margin-bottom: 28px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--color-primary);
  text-transform: uppercase;
}

.section-label::before {
  content: "";
  display: inline-block;
  width: 16px;
  height: 2px;
  background: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
}

.section-lead {
  max-width: 52em;
  font-size: 15px;
  color: var(--color-text-dim);
}

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

.split-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 600px) {
  .eq-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .eq-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 880px) {
  .split-grid.is-narrow {
    grid-template-columns: minmax(240px, 0.36fr) 1fr;
  }
  .split-grid.is-wide {
    grid-template-columns: 1fr minmax(240px, 0.36fr);
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), #0090c8);
  border-color: transparent;
  color: var(--bg-deep);
  font-weight: 800;
  box-shadow: 0 2px 12px rgba(0, 200, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(0, 200, 255, 0.45);
  color: var(--bg-deep);
}

.btn-ghost {
  border-color: rgba(0, 200, 255, 0.4);
  background: rgba(0, 200, 255, 0.06);
  color: var(--color-primary);
}

.btn-ghost:hover {
  background: rgba(0, 200, 255, 0.12);
  color: var(--color-primary);
}

.btn-warm {
  background: linear-gradient(135deg, var(--color-warm), #e86200);
  border-color: transparent;
  color: var(--bg-deep);
  font-weight: 800;
  box-shadow: 0 2px 10px rgba(255, 122, 0, 0.3);
}

.btn-warm:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(255, 122, 0, 0.4);
  color: var(--bg-deep);
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  border-color: rgba(0, 200, 255, 0.35);
  box-shadow: 0 6px 24px rgba(0, 200, 255, 0.08);
}

.card-panel {
  background: var(--bg-nested);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.card-title {
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 800;
}

.card-note {
  font-size: 14px;
  color: var(--color-text-dim);
}

.stat-card .stat-value {
  font-family: var(--font-data);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-accent);
}

.stat-card .stat-label {
  margin-top: 4px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-text-dim);
}

.data-bar {
  display: grid;
  gap: 14px;
}

.bar-row {
  display: grid;
  grid-template-columns: minmax(90px, 1fr) minmax(120px, 1.6fr) auto;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}

.bar-label {
  color: var(--color-text);
  font-weight: 600;
}

.bar-track {
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.bar-value {
  font-family: var(--font-data);
  color: var(--color-text-dim);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  background: rgba(0, 200, 255, 0.08);
  border: 1px solid rgba(0, 200, 255, 0.3);
  border-radius: 4px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.03em;
}

.tag-warm {
  background: rgba(255, 122, 0, 0.08);
  border-color: rgba(255, 122, 0, 0.35);
  color: var(--color-warm);
}

.tag-neutral {
  background: rgba(154, 168, 193, 0.08);
  border-color: rgba(154, 168, 193, 0.25);
  color: var(--color-text-dim);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
  font-family: var(--font-data);
  font-size: 13px;
  line-height: 1;
  color: var(--color-text-dim);
}

.breadcrumbs a {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.breadcrumbs .crumb-sep {
  margin: 0 6px;
  color: var(--color-text-dim);
  opacity: 0.6;
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-text);
}

.page-hero {
  position: relative;
  padding: 48px 0 36px;
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(180deg, rgba(0, 200, 255, 0.05), transparent 70%);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -6%;
  width: 42%;
  height: 160%;
  border-left: 1px solid rgba(0, 200, 255, 0.1);
  pointer-events: none;
  transform: skewX(-18deg);
}

.hero-title {
  margin: 6px 0 10px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--color-text-dim);
  letter-spacing: 0.04em;
}

.hero-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 16px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-text-dim);
}

.hero-index .idx {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-index .idx::before {
  content: "▪";
  color: var(--color-primary);
}

.media-frame {
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--bg-nested);
  aspect-ratio: 16 / 9;
  min-height: 160px;
  overflow: hidden;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0, 200, 255, 0.06), transparent 65%);
  pointer-events: none;
}

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

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

.media-note {
  position: absolute;
  z-index: 2;
  bottom: 10px;
  left: 12px;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(10, 14, 26, 0.6);
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-text-dim);
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 14px;
  z-index: 300;
  padding: 10px 20px;
  background: var(--color-accent);
  color: var(--bg-deep);
  font-size: 14px;
  font-weight: 800;
  border-radius: 4px;
  text-decoration: none;
  transition: top 0.3s ease;
}

.skip-link:focus-visible {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.92);
  border-bottom: 1px solid var(--color-border);
}

@supports (backdrop-filter: blur(8px)) {
  .site-header {
    background: rgba(10, 14, 26, 0.78);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }
}

.progress-track {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: 3px;
  overflow: hidden;
  pointer-events: none;
}

.progress-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent), var(--color-warm));
  box-shadow: 0 0 10px rgba(0, 200, 255, 0.5);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--container-width);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: 24px;
  transition: min-height 0.3s ease;
}

.site-header[data-shrunk] .header-inner {
  min-height: var(--header-h-shrunk);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  color: var(--color-text);
  text-decoration: none;
}

.brand-glyph {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--bg-deep);
  font-family: var(--font-data);
  font-weight: 800;
  font-size: 22px;
  clip-path: polygon(0 0, 100% 0, 100% 74%, 74% 100%, 0 100%);
  box-shadow: var(--shadow-glow);
  transition: width 0.3s ease, height 0.3s ease, font-size 0.3s ease;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text strong {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-text small {
  max-height: 18px;
  overflow: hidden;
  font-size: 11px;
  color: var(--color-text-dim);
  letter-spacing: 0.08em;
  white-space: nowrap;
  opacity: 1;
  transition: opacity 0.2s ease, max-height 0.3s ease;
}

.site-header[data-shrunk] .brand-glyph {
  width: 32px;
  height: 32px;
  font-size: 18px;
}

.site-header[data-shrunk] .brand-text small {
  max-height: 0;
  opacity: 0;
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item {
  display: block;
}

.nav-link {
  position: relative;
  display: block;
  padding: 10px 12px;
  color: var(--color-text-dim);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color 0.25s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-text);
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.nav-toggle:hover {
  border-color: var(--color-primary);
  background: rgba(0, 200, 255, 0.05);
}

.toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

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

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

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

@media (max-width: 1023.98px) {
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-deep);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 16px 30px rgba(0, 0, 0, 0.45);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.35s ease, opacity 0.25s ease, visibility 0.35s;
  }

  .site-nav[data-open] {
    max-height: 520px;
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
  }

  .nav-link {
    padding: 14px 28px;
    border-left: 2px solid transparent;
    font-size: 16px;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link:hover,
  .nav-link:focus-visible,
  .nav-link[aria-current="page"] {
    background: rgba(0, 200, 255, 0.05);
    border-left-color: var(--color-primary);
  }

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

@media (min-width: 1024px) {
  .site-nav {
    position: static;
    background: transparent;
    border-top: none;
    box-shadow: none;
    max-height: none;
    overflow: visible;
    opacity: 1;
    visibility: visible;
  }
}

.site-footer {
  position: relative;
  padding: 60px 0 24px;
  border-top: 1px solid var(--color-border);
  background: linear-gradient(180deg, var(--bg-deep) 0%, #070a12 100%);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-primary), var(--color-accent), transparent);
  opacity: 0.5;
}

.footer-decor {
  position: absolute;
  top: 0;
  right: -12%;
  width: 55%;
  height: 100%;
  border-left: 1px solid rgba(0, 200, 255, 0.05);
  background: repeating-linear-gradient(
    -12deg,
    transparent 0 26px,
    rgba(255, 255, 255, 0.012) 26px 27px
  );
  transform: skewX(-12deg);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-bottom: 40px;
}

.footer-brand {
  max-width: 380px;
}

.footer-trust {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-dim);
}

.footer-col {
  min-width: 0;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-text-dim);
  text-transform: uppercase;
}

.footer-heading::before {
  content: "//";
  color: var(--color-primary);
  font-size: 10px;
}

.footer-list li + li {
  margin-top: 10px;
}

.footer-link {
  color: var(--color-text-dim);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-link:hover {
  padding-left: 4px;
  color: var(--color-primary);
}

.footer-contact-row {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-dim);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--color-text-dim);
}

.footer-copy {
  color: var(--color-text-dim);
}

.footer-icp {
  letter-spacing: 0.04em;
}

@media (min-width: 768px) and (max-width: 1023.98px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1.3fr 0.8fr 0.6fr 0.6fr;
    gap: 48px;
  }

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

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

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

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

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

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

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  html {
    scroll-behavior: auto !important;
  }
}