:root {
  --color-abyss: #0E1A26;
  --color-navy: #122A3A;
  --color-cyan: #1D8EA5;
  --color-lime: #B8F34B;
  --color-orange: #FF6A3D;
  --color-frost: #E8F0F5;
  --color-steel: #9CB0C0;
  --color-gold: #FFD166;
  --color-carbon: #05080D;
  --color-valid: #33D69A;

  --font-display: 'Archivo Black', 'Noto Sans SC Black', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', 'SFMono-Regular', Consolas, 'Noto Sans SC', monospace;

  --text-display: clamp(40px, 8vw, 84px);
  --text-h2: clamp(24px, 4vw, 40px);
  --text-body: 16px;

  --container-max: 1280px;
  --header-h: 72px;
  --gutter: clamp(20px, 4vw, 48px);
  --border-cyan: rgba(29, 142, 165, 0.35);
  --transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.75;
  color: var(--color-frost);
  background-color: var(--color-abyss);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

ul, ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition);
}

button {
  font: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
}

::selection {
  background: var(--color-lime);
  color: var(--color-carbon);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  color: var(--color-frost);
}

h1 {
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-h2);
  line-height: 1.12;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(18px, 2.4vw, 26px);
  line-height: 1.25;
}

h4 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 16px;
}

p {
  color: rgba(232, 240, 245, 0.92);
}

:focus-visible {
  outline: 2px solid var(--color-lime);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: var(--gutter);
  z-index: 1000;
  background: var(--color-lime);
  color: var(--color-carbon);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 12px 20px;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 16px;
}

.container {
  width: min(100% - calc(var(--gutter) * 2), var(--container-max));
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - calc(var(--gutter) * 2), 880px);
  margin-inline: auto;
}

#main-content {
  min-height: 60vh;
  scroll-margin-top: calc(var(--header-h) + 8px);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    background-color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.site-header[data-scrolled] {
  background: var(--color-abyss);
  border-bottom-color: var(--border-cyan);
  box-shadow: 0 1px 0 rgba(5, 8, 13, 0.45);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--color-lime);
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: 6;
  pointer-events: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand__mark {
  position: relative;
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  background: linear-gradient(135deg, rgba(29, 142, 165, 0.55) 0%, rgba(184, 243, 75, 0.35) 100%);
  border: 2px solid var(--color-lime);
}

.brand__mark::after {
  content: '';
  position: absolute;
  right: -2px;
  bottom: -2px;
  width: 10px;
  height: 10px;
  background: var(--color-orange);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  letter-spacing: 0.03em;
  color: var(--color-frost);
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-steel);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  list-style: none;
}

.site-nav__link {
  display: block;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(232, 240, 245, 0.78);
  border: 1px solid transparent;
  transition:
    color var(--transition),
    border-color var(--transition),
    background-color var(--transition);
}

.site-nav__link:hover {
  color: var(--color-lime);
  border-color: rgba(184, 243, 75, 0.35);
  background: rgba(184, 243, 75, 0.06);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-lime);
  border-color: rgba(184, 243, 75, 0.5);
  background: rgba(184, 243, 75, 0.1);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--border-cyan);
  background: rgba(14, 26, 38, 0.65);
  transition:
    border-color var(--transition),
    background-color var(--transition);
}

.nav-toggle:hover {
  border-color: rgba(184, 243, 75, 0.6);
}

.nav-toggle[aria-expanded="true"] {
  background: rgba(184, 243, 75, 0.12);
  border-color: rgba(184, 243, 75, 0.6);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-frost);
  transition:
    transform var(--transition),
    opacity var(--transition);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  transform: translateY(-3px) rotate(-45deg);
}

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-frost);
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--color-abyss);
    border-bottom: 1px solid var(--border-cyan);
    box-shadow: 0 12px 24px rgba(5, 8, 13, 0.5);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition:
      transform var(--transition),
      opacity var(--transition),
      visibility var(--transition);
  }

  .site-nav[data-open] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    gap: 4px;
  }

  .site-nav__link {
    padding: 14px 16px;
    font-size: 15px;
    border-color: transparent;
  }

  .site-nav__link[aria-current="page"] {
    border-color: rgba(184, 243, 75, 0.5);
  }
}

.section {
  padding: clamp(64px, 10vw, 120px) 0;
}

.section--navy {
  background: var(--color-navy);
}

.section--carbon {
  background: var(--color-carbon);
}

.section--top {
  padding-top: calc(var(--header-h) + clamp(24px, 4vw, 48px));
}

.hero-screen {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
  padding: calc(var(--header-h) + clamp(32px, 6vw, 72px)) 0 clamp(40px, 6vw, 72px);
  overflow: hidden;
}

.hero-screen::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(29, 142, 165, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 142, 165, 0.14) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 70% 40%, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0) 72%);
  mask-image: radial-gradient(ellipse 90% 80% at 70% 40%, rgba(0, 0, 0, 0.9) 0%, rgba(0, 0, 0, 0) 72%);
  pointer-events: none;
}

.split-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
}

@media (max-width: 900px) {
  .split-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

.page-head {
  padding: calc(var(--header-h) + clamp(40px, 7vw, 80px)) 0 clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--border-cyan);
  margin-bottom: clamp(32px, 5vw, 64px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-lime);
  margin-bottom: 18px;
}

.eyebrow::before {
  content: '';
  width: 10px;
  height: 10px;
  background: var(--color-lime);
  flex-shrink: 0;
}

.section-title {
  font-size: var(--text-h2);
  line-height: 1.12;
  margin-bottom: 24px;
  max-width: 22ch;
}

.section-title em {
  font-style: normal;
  color: var(--color-lime);
}

.prose {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(232, 240, 245, 0.88);
}

.prose p + p {
  margin-top: 1em;
}

.prose strong {
  color: var(--color-frost);
  font-weight: 700;
}

.prose a {
  color: var(--color-cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition:
    color var(--transition),
    text-decoration-color var(--transition);
}

.prose a:hover {
  color: var(--color-lime);
  text-decoration-color: transparent;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 28px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-carbon);
  background: var(--color-lime);
  border: 1px solid var(--color-lime);
  border-radius: 0;
  box-shadow: 5px 5px 0 0 var(--color-orange);
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    background-color var(--transition),
    color var(--transition);
}

.btn:hover {
  background: var(--color-lime);
  color: var(--color-carbon);
  transform: translate(2px, 2px);
  box-shadow: 3px 3px 0 0 var(--color-orange);
}

.btn--ghost {
  color: var(--color-frost);
  background: transparent;
  border-color: var(--color-cyan);
  box-shadow: 5px 5px 0 0 rgba(29, 142, 165, 0.55);
}

.btn--ghost:hover {
  color: var(--color-frost);
  background: rgba(29, 142, 165, 0.14);
  border-color: var(--color-cyan);
  transform: translate(2px, 2px);
  box-shadow: 3px 3px 0 0 rgba(29, 142, 165, 0.7);
}

.card {
  position: relative;
  background: rgba(18, 42, 58, 0.72);
  border: 1px solid var(--border-cyan);
  padding: clamp(20px, 3vw, 32px);
  border-radius: 0;
  transition:
    transform var(--transition),
    border-color var(--transition),
    background-color var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(29, 142, 165, 0.75);
  background: rgba(18, 42, 58, 0.92);
}

.card__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 900;
  line-height: 1.3;
  color: var(--color-frost);
  margin-bottom: 8px;
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-steel);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.5vw, 28px);
}

.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;
}

@media (max-width: 900px) {
  .col-4,
  .col-5,
  .col-6,
  .col-7,
  .col-8 {
    grid-column: 1 / -1;
  }
}

.stat-card {
  background: var(--color-navy);
  border: 1px solid var(--border-cyan);
  padding: 20px 24px;
  border-radius: 0;
}

.stat-card__number {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-frost);
  margin-bottom: 6px;
}

.stat-card__number--lime {
  color: var(--color-lime);
}

.stat-card__number--orange {
  color: var(--color-orange);
}

.stat-card__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-steel);
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-cyan);
  background: rgba(29, 142, 165, 0.12);
  border: 1px solid rgba(29, 142, 165, 0.45);
  border-radius: 0;
}

.tag--orange {
  color: var(--color-orange);
  background: rgba(255, 106, 61, 0.1);
  border-color: rgba(255, 106, 61, 0.45);
}

.tag--lime {
  color: var(--color-lime);
  background: rgba(184, 243, 75, 0.08);
  border-color: rgba(184, 243, 75, 0.4);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-orange);
}

.live-pill::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-orange);
  animation: pill-pulse 2s ease-in-out infinite;
}

@keyframes pill-pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.35;
    transform: scale(0.8);
  }
}

.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  background: var(--color-navy);
  border: 1px solid var(--border-cyan);
}

.segmented__btn {
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-steel);
  border: 1px solid transparent;
  border-radius: 0;
  transition:
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition);
}

.segmented__btn:hover {
  color: var(--color-frost);
  background: rgba(29, 142, 165, 0.14);
}

.segmented__btn[aria-selected="true"] {
  color: var(--color-carbon);
  background: var(--color-lime);
  border-color: var(--color-lime);
}

.tab-panel[hidden] {
  display: none;
}

.tab-panel {
  padding-top: 24px;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border-cyan);
  border: 1px solid var(--border-cyan);
}

.compare-grid > * {
  background: var(--color-navy);
  padding: clamp(20px, 3vw, 28px);
}

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

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-steel);
  margin-bottom: 16px;
}

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

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

.breadcrumb__sep {
  color: rgba(156, 176, 192, 0.5);
}

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

.media {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(29, 142, 165, 0.28) 0%, rgba(14, 26, 38, 0.5) 55%, rgba(184, 243, 75, 0.12) 100%);
  border: 1px solid var(--border-cyan);
}

.media::before {
  content: '视觉占位';
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(156, 176, 192, 0.5);
  pointer-events: none;
}

.media > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--4-3 {
  aspect-ratio: 4 / 3;
}

.media--16-9 {
  aspect-ratio: 16 / 9;
}

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

.media--3-4 {
  aspect-ratio: 3 / 4;
}

.media--free {
  min-height: 220px;
}

.board {
  position: relative;
  background: rgba(18, 42, 58, 0.6);
  border: 1px solid var(--border-cyan);
  padding: clamp(24px, 4vw, 40px);
}

.board::before {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  width: 20px;
  height: 20px;
  border-top: 3px solid var(--color-lime);
  border-left: 3px solid var(--color-lime);
}

.board__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-cyan);
  margin-bottom: 12px;
}

.board__summary {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(232, 240, 245, 0.9);
  padding-bottom: 20px;
  margin-bottom: 20px;
  border-bottom: 1px dashed rgba(29, 142, 165, 0.3);
}

.board__block {
  padding: 14px 16px;
  border-left: 2px solid var(--color-cyan);
  background: rgba(14, 26, 38, 0.45);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
}

.board__block + .board__block {
  margin-top: 12px;
}

.board__block strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-frost);
  margin-bottom: 4px;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 500ms ease,
    transform 500ms ease;
  transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

.site-footer {
  background: var(--color-carbon);
  border-top: 1px solid var(--border-cyan);
  padding-top: clamp(40px, 7vw, 80px);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 2fr) minmax(0, 2fr) minmax(0, 4fr);
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(32px, 6vw, 56px);
}

.site-footer__brandblock {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
}

.brand--footer .brand__logo {
  font-size: 24px;
}

.brand--footer .brand__mark {
  width: 34px;
  height: 34px;
}

.site-footer__trust {
  max-width: 38ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--color-steel);
  border-left: 3px solid var(--color-cyan);
  padding-left: 14px;
}

.site-footer__heading {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-lime);
  padding-bottom: 8px;
  margin-bottom: 16px;
  border-bottom: 1px solid rgba(29, 142, 165, 0.3);
}

.site-footer__links li + li,
.site-footer__contact li + li {
  margin-top: 8px;
}

.site-footer__links a {
  font-size: 14px;
  color: var(--color-steel);
  transition:
    color var(--transition),
    padding-left var(--transition);
}

.site-footer__links a:hover {
  color: var(--color-lime);
  padding-left: 4px;
}

.site-footer__col--contact {
  background: rgba(29, 142, 165, 0.08);
  border: 1px solid rgba(29, 142, 165, 0.25);
  padding: 18px;
}

.site-footer__contact li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-steel);
}

.site-footer__note {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.75;
  color: rgba(156, 176, 192, 0.65);
  border-top: 1px dashed rgba(29, 142, 165, 0.25);
  padding-top: 10px;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 20px 0 24px;
  border-top: 1px solid rgba(29, 142, 165, 0.2);
}

.site-footer__copyright,
.site-footer__icp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(156, 176, 192, 0.7);
}

@media (max-width: 900px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
  }

  .site-footer__brandblock,
  .site-footer__col--contact {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
  }

  .site-footer__brandblock,
  .site-footer__col--contact {
    grid-column: auto;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}