:root {
  --bg-deep: #0A0E17;
  --bg-card: #111726;
  --bg-elev: #1A2236;
  --accent-cyan: #00E5FF;
  --accent-green: #39FF14;
  --accent-orange: #FF6A00;
  --text-primary: #F0F4F8;
  --text-secondary: #A8B2C1;
  --border-color: #2A3A5C;
  --font-display: "Chakra Petch", "Arial Black", "Segoe UI", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  --sidebar-w: 280px;
  --header-h: 64px;
  --container: 1200px;
  --radius: 8px;
  --radius-lg: 16px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.3s var(--ease-out);
  --z-header: 100;
  --z-nav: 200;
  --z-overlay: 120;
  --z-skip: 999;
}

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

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

body {
  margin: 0;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
  margin-left: var(--sidebar-w);
}

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

a {
  color: var(--accent-cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

button {
  font: inherit;
}

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

#main-content {
  min-height: 60vh;
  scroll-margin-top: var(--header-h);
}

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

.skip-link {
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--accent-cyan);
  color: #0A0E17;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  border-radius: var(--radius);
  transform: translateY(-200%);
  transition: transform 0.3s var(--ease-out);
  z-index: var(--z-skip);
}
.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-w);
  background: linear-gradient(180deg, #0D1424 0%, var(--bg-card) 55%, #090D16 100%);
  border-right: 1px solid var(--border-color);
  z-index: var(--z-header);
  display: flex;
  flex-direction: column;
}
.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  right: -1px;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent-cyan) 0%, transparent 30%, rgba(57, 255, 20, 0.5) 60%, transparent 85%, var(--accent-orange) 100%);
  opacity: 0.28;
  pointer-events: none;
}

.header-inner {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--space-lg);
  min-height: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
}
.brand-mark {
  width: 48px;
  height: 48px;
  background: var(--accent-cyan);
  color: #0A0E17;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  transform: skewX(-8deg);
  box-shadow: 0 0 28px rgba(0, 229, 255, 0.25);
  flex-shrink: 0;
}
.brand-mark-text {
  transform: skewX(8deg);
  line-height: 1;
}
.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}
.brand-tag {
  font-size: 0.7rem;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: border-color 0.3s ease;
}
.nav-toggle:hover {
  border-color: var(--accent-cyan);
}
.toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  margin: 2px 0;
  transition: transform 0.3s var(--ease-out), opacity 0.3s ease;
}
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(6px) 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(-6px) rotate(-45deg);
}

.site-nav {
  margin-top: var(--space-xl);
}
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 0.9rem var(--space-md);
  text-decoration: none;
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  background: transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
  position: relative;
}
.nav-link:hover {
  color: var(--text-primary);
  background: rgba(0, 229, 255, 0.05);
  border-left-color: var(--accent-cyan);
}
.nav-link:active {
  background: rgba(0, 229, 255, 0.1);
}
.nav-link[aria-current="page"] {
  color: var(--text-primary);
  background: linear-gradient(90deg, rgba(0, 229, 255, 0.1), transparent);
  border-left-color: var(--accent-cyan);
}
.nav-link[aria-current="page"] .nav-num {
  color: var(--accent-green);
}
.nav-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent-cyan);
  letter-spacing: 0.04em;
}
.nav-label {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transform: skewX(-3deg);
  transition: transform 0.3s var(--ease-out);
}
.nav-link:hover .nav-label {
  transform: skewX(-5deg) translateX(2px);
}

.header-status {
  margin-top: auto;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: rgba(0, 229, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}
.status-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  animation: statusPulse 2s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes statusPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.5); }
  50% { box-shadow: 0 0 0 6px rgba(57, 255, 20, 0); }
}
.status-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.nav-overlay {
  display: none;
}

.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  position: relative;
  margin-top: var(--space-2xl);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan) 30%, var(--accent-green) 70%, transparent);
  opacity: 0.4;
  pointer-events: none;
}
.footer-grid {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg) var(--space-xl);
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: var(--space-xl);
}
.footer-brand .brand {
  margin-bottom: var(--space-md);
}
.footer-desc {
  margin: var(--space-md) 0 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 32em;
}
.footer-trust {
  margin: var(--space-sm) 0 0;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text-secondary);
  border-left: 2px solid var(--accent-green);
  padding-left: var(--space-sm);
  background: rgba(57, 255, 20, 0.03);
}
.footer-contact {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer-contact-item {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
}
a.footer-contact-item {
  color: var(--accent-cyan);
  transition: color 0.3s ease;
}
a.footer-contact-item:hover {
  color: var(--text-primary);
}
.footer-col h4 {
  margin: 0 0 var(--space-md);
}
.footer-title {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.footer-links a {
  display: inline-block;
  padding: 4px 0;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition), padding-left var(--transition);
}
.footer-links a:hover {
  color: var(--accent-cyan);
  padding-left: 8px;
}
.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  justify-content: space-between;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.75rem;
  border-top: 1px solid rgba(42, 58, 92, 0.6);
}

.grid {
  display: grid;
  gap: var(--space-lg);
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg-elev);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-lg);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.card:hover {
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.65rem 1.25rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  cursor: pointer;
  transform: skewX(-4deg);
  transition: border-color var(--transition), color var(--transition), background var(--transition), box-shadow var(--transition);
}
.btn > * {
  transform: skewX(4deg);
}
.btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.12);
}
.btn-primary {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: #0A0E17;
}
.btn-primary:hover {
  background: transparent;
  color: var(--accent-cyan);
}
.btn-outline {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}
.btn-outline:hover {
  background: rgba(0, 229, 255, 0.08);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  margin: 0 0 var(--space-xl);
  padding: 0;
  list-style: none;
  font-size: 0.75rem;
  color: var(--text-secondary);
}
.breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-sm);
  color: var(--border-color);
}
.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}
.breadcrumb a:hover {
  color: var(--accent-cyan);
}
.breadcrumb [aria-current="page"] {
  color: var(--text-primary);
}

.page-heading {
  padding: var(--space-2xl) 0 var(--space-xl);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--space-2xl);
}
.page-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  font-weight: 700;
  line-height: 1.05;
  margin: 0;
  letter-spacing: 0.01em;
  transform: skewX(-5deg);
  color: var(--text-primary);
}
.page-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: var(--space-md);
  max-width: 720px;
  line-height: 1.8;
}

.section-number {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-cyan);
  margin-bottom: var(--space-xs);
}
.section-number::after {
  content: "";
  display: block;
  width: 36px;
  height: 1px;
  background: var(--accent-cyan);
  opacity: 0.5;
}
.section-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 var(--space-md);
  color: var(--text-primary);
  letter-spacing: 0.01em;
  transform: skewX(-3deg);
}

.content-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
}
.content-body h1,
.content-body h2,
.content-body h3,
.content-body h4 {
  font-family: var(--font-display);
  color: var(--text-primary);
  margin: var(--space-xl) 0 var(--space-sm);
  line-height: 1.3;
}
.content-body p {
  margin-bottom: var(--space-md);
}
.content-body a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.content-body ul {
  list-style: none;
  margin: var(--space-md) 0;
  padding: 0;
}
.content-body ul li {
  padding-left: 1.5rem;
  position: relative;
  margin-bottom: var(--space-sm);
}
.content-body ul li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

.data-badge {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.1;
  color: var(--accent-cyan);
  font-variant-numeric: tabular-nums;
}
.data-badge .data-unit {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-family: var(--font-body);
}
.data-badge--up {
  color: var(--accent-green);
}
.data-badge--down {
  color: var(--accent-orange);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px 10px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: var(--bg-card);
  white-space: nowrap;
  line-height: 1.5;
}
.tag--live {
  color: var(--accent-green);
  border-color: rgba(57, 255, 20, 0.4);
  background: rgba(57, 255, 20, 0.04);
}
.tag--hot {
  color: var(--accent-orange);
  border-color: rgba(255, 106, 0, 0.4);
  background: rgba(255, 106, 0, 0.04);
}

.tabs-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--space-lg);
}
.tabs-trigger {
  padding: var(--space-sm) var(--space-lg);
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}
.tabs-trigger:hover {
  color: var(--text-primary);
}
.tabs-trigger[aria-selected="true"] {
  color: var(--accent-cyan);
  border-color: var(--border-color);
  background: var(--bg-elev);
  position: relative;
}
.tabs-trigger[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--accent-cyan);
}
.tabs-panel[hidden] {
  display: none;
}
.tabs-panel {
  animation: tabFadeIn 0.35s var(--ease-out);
}
@keyframes tabFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.image-frame {
  position: relative;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(0, 229, 255, 0.08), transparent 32%),
    repeating-linear-gradient(45deg, transparent, transparent 12px, rgba(255, 255, 255, 0.018) 12px, rgba(255, 255, 255, 0.018) 24px),
    var(--bg-card);
  overflow: hidden;
  aspect-ratio: var(--frame-ratio, 16 / 9);
}
.image-frame::before {
  content: "IMG";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--text-secondary);
  z-index: 0;
}
.image-frame > img {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}
.image-frame figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(transparent, rgba(10, 14, 23, 0.85));
  font-size: 0.75rem;
  color: var(--text-primary);
  z-index: 2;
}

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  transition-delay: 0.05s;
}
html.js [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

@media (max-width: 1023px) {
  body {
    margin-left: 0;
    padding-top: var(--header-h);
  }

  .site-header {
    inset: 0 0 auto 0;
    width: 100%;
    height: var(--header-h);
    flex-direction: row;
    align-items: center;
    padding: 0 var(--space-md);
    background: rgba(13, 20, 36, 0.96);
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
  .site-header::before {
    display: none;
  }

  .header-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0;
    max-width: 720px;
    margin: 0 auto;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
    font-size: 0.9rem;
  }
  .brand-name {
    font-size: 1.05rem;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    bottom: 0;
    width: 300px;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    padding: var(--space-lg);
    margin-top: 0;
    transform: translateX(-100%);
    transition: transform 0.35s var(--ease-out);
    z-index: var(--z-nav);
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.35);
    overflow-y: auto;
  }
  .site-nav[data-open] {
    transform: translateX(0);
  }

  .nav-overlay {
    display: block;
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(10, 14, 23, 0.65);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: var(--z-overlay);
  }
  .nav-overlay[data-open] {
    opacity: 1;
    visibility: visible;
  }

  .header-status {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 767px) {
  :root {
    --space-2xl: 40px;
  }

  .brand-tag {
    display: none;
  }

  .header-inner {
    max-width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  .footer-brand {
    grid-column: auto;
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .page-heading {
    padding: var(--space-xl) 0 var(--space-lg);
  }

  .tabs-trigger {
    padding: var(--space-sm) var(--space-md);
  }
}

@media (max-width: 480px) {
  .site-header {
    padding: 0 var(--space-sm);
  }
  .brand-name {
    font-size: 1rem;
  }
  .skip-link {
    font-size: 0.75rem;
  }
}

@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;
  }
  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .status-dot {
    animation: none;
  }
  .tabs-panel {
    animation: none;
  }
}