:root {
  --bg: #071018;
  --bg-soft: #0b1621;
  --panel: rgba(12, 22, 33, 0.72);
  --panel-strong: rgba(10, 18, 28, 0.92);
  --text: #eef4fb;
  --muted: rgba(238, 244, 251, 0.72);
  --line: rgba(156, 190, 216, 0.18);
  --accent: #86f2da;
  --accent-2: #f4c26c;
  --accent-3: #5ab0ff;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.36);
  --radius: 28px;
  --max: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 10%, rgba(90, 176, 255, 0.18), transparent 28%),
    radial-gradient(circle at 80% 15%, rgba(134, 242, 218, 0.14), transparent 30%),
    radial-gradient(circle at 60% 85%, rgba(244, 194, 108, 0.14), transparent 30%),
    linear-gradient(180deg, #041018 0%, #06131d 52%, #050c13 100%);
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 100% 36px, 36px 100%;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.32), rgba(0, 0, 0, 0.05) 42%, transparent 100%);
  opacity: 0.24;
}

h1,
h2,
h3,
.brand-mark {
  font-family: "Source Han Serif SC", "Songti SC", "STSong", serif;
}

a {
  color: inherit;
  text-decoration: none;
}

.page-shell {
  width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: min(var(--max), calc(100% - 40px));
  margin: 18px auto 0;
  padding: 16px 20px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  background: rgba(6, 13, 20, 0.7);
  backdrop-filter: blur(18px);
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.22);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(134, 242, 218, 0.96), rgba(90, 176, 255, 0.96));
  color: #05131b;
  font-size: 1.2rem;
  font-weight: 800;
  box-shadow: 0 12px 24px rgba(90, 176, 255, 0.24);
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-copy strong {
  font-size: 1.02rem;
  letter-spacing: 0.06em;
}

.brand-copy small {
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.96rem;
}

.site-nav a {
  color: rgba(238, 244, 251, 0.84);
  transition: color 180ms ease, transform 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: #fff;
  transform: translateY(-1px);
}

.nav-download {
  padding: 10px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(134, 242, 218, 0.16), rgba(244, 194, 108, 0.14));
  border: 1px solid rgba(134, 242, 218, 0.22);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.6px;
  margin: 0 auto;
  background: currentColor;
}

.nav-toggle span + span {
  margin-top: 6px;
}

.section {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  min-height: calc(100svh - 92px);
  display: grid;
  align-items: center;
  padding: 36px 0 26px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  align-items: center;
  gap: 42px;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 640px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: rgba(134, 242, 218, 0.9);
  font-size: 0.82rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3.5rem, 6.6vw, 6.5rem);
  line-height: 0.92;
  letter-spacing: 0.02em;
}

.hero-lead {
  max-width: 42rem;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.55vw, 1.22rem);
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button-primary {
  background: linear-gradient(135deg, rgba(134, 242, 218, 0.98), rgba(90, 176, 255, 0.96));
  color: #061019;
  box-shadow: 0 18px 42px rgba(90, 176, 255, 0.24);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--text);
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.hero-points span {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(238, 244, 251, 0.8);
  font-size: 0.88rem;
}

.hero-visual {
  position: relative;
}

.visual-frame {
  position: relative;
  min-height: 660px;
  border-radius: 40px;
  background:
    radial-gradient(circle at 50% 45%, rgba(134, 242, 218, 0.16), transparent 30%),
    radial-gradient(circle at 70% 35%, rgba(244, 194, 108, 0.12), transparent 34%),
    linear-gradient(180deg, rgba(12, 24, 36, 0.88), rgba(5, 12, 18, 0.96));
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.visual-frame::before,
.visual-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.visual-frame::before {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.08), transparent 26%),
    radial-gradient(circle at 16% 18%, rgba(90, 176, 255, 0.2), transparent 18%),
    radial-gradient(circle at 82% 20%, rgba(134, 242, 218, 0.18), transparent 16%);
  opacity: 0.6;
}

.visual-frame::after {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 100%);
  opacity: 0.3;
}

.network-map {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.95;
}

.visual-caption {
  position: absolute;
  left: 28px;
  bottom: 28px;
  width: min(320px, calc(100% - 56px));
  padding: 20px 22px;
  border-radius: 24px;
  background: rgba(6, 14, 22, 0.68);
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(16px);
}

.visual-caption span {
  display: inline-block;
  color: rgba(134, 242, 218, 0.92);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
}

.visual-caption strong {
  display: block;
  margin-top: 12px;
  font-size: 1.75rem;
  line-height: 1.1;
}

.visual-caption p {
  margin: 12px 0 0;
  color: rgba(238, 244, 251, 0.72);
  line-height: 1.7;
}

.highlight-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 10px;
}

.highlight-strip > div {
  padding: 24px 22px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(14px);
}

.highlight-strip span {
  display: block;
  color: rgba(238, 244, 251, 0.66);
  font-size: 0.84rem;
  letter-spacing: 0.1em;
}

.highlight-strip strong {
  display: block;
  margin-top: 12px;
  font-size: clamp(1.4rem, 2vw, 2rem);
  line-height: 1.1;
}

.feature-slab,
.split-slab,
.stats-slab,
.download-slab {
  padding-top: 140px;
}

.section-head {
  display: grid;
  gap: 12px;
  max-width: 760px;
  margin-bottom: 28px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(2rem, 3.4vw, 3.45rem);
  line-height: 1.1;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.feature-grid article {
  min-height: 180px;
  padding: 26px 26px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.015));
}

.feature-grid h3 {
  margin: 0 0 12px;
  font-size: 1.5rem;
}

.feature-grid p,
.split-copy p,
.timeline-item p,
.download-copy p,
.panel-note,
.site-footer p {
  color: var(--muted);
  line-height: 1.9;
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  gap: 26px;
  align-items: center;
}

.split-copy {
  font-size: 1.05rem;
}

.list-lines {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.list-lines li {
  position: relative;
  padding-left: 22px;
  color: rgba(238, 244, 251, 0.86);
  line-height: 1.8;
}

.list-lines li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.92em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 0 5px rgba(134, 242, 218, 0.09);
}

.resource-radar {
  position: relative;
  min-height: 540px;
  border-radius: 34px;
  background:
    radial-gradient(circle at 50% 50%, rgba(134, 242, 218, 0.14), transparent 28%),
    linear-gradient(180deg, rgba(10, 18, 28, 0.9), rgba(6, 12, 18, 0.98));
  border: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.resource-radar::before {
  content: "10 万+";
  position: absolute;
  inset: auto auto 26px 26px;
  color: rgba(255, 255, 255, 0.88);
  font-family: "Source Han Serif SC", serif;
  font-size: clamp(2.2rem, 5vw, 4rem);
  letter-spacing: 0.04em;
}

.radar-core,
.radar-ring,
.radar-pin {
  position: absolute;
  border-radius: 50%;
}

.radar-core {
  inset: 50% auto auto 50%;
  width: 88px;
  height: 88px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(134, 242, 218, 0.98), rgba(90, 176, 255, 0.16) 70%, transparent 72%);
  box-shadow: 0 0 0 38px rgba(134, 242, 218, 0.05), 0 0 0 82px rgba(90, 176, 255, 0.05);
}

.radar-ring {
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  border: 1px solid rgba(134, 242, 218, 0.16);
}

.ring-1 { width: 210px; height: 210px; }
.ring-2 { width: 330px; height: 330px; }
.ring-3 { width: 460px; height: 460px; }

.radar-pin {
  width: 14px;
  height: 14px;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  box-shadow: 0 0 0 8px rgba(244, 194, 108, 0.08);
}

.pin-1 { top: 18%; left: 24%; }
.pin-2 { top: 25%; right: 18%; }
.pin-3 { bottom: 26%; left: 18%; }
.pin-4 { bottom: 18%; right: 24%; }

.team-timeline {
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.timeline-item {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 24px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.timeline-item span {
  display: inline-grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(134, 242, 218, 0.16), rgba(90, 176, 255, 0.12));
  border: 1px solid rgba(134, 242, 218, 0.22);
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.timeline-item h3 {
  margin: 0 0 8px;
  font-size: 1.45rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.stat-row {
  padding: 30px 24px;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.015));
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.stat-row strong {
  display: block;
  font-size: clamp(2rem, 3vw, 3.2rem);
  line-height: 1;
  letter-spacing: 0.03em;
}

.stat-row span {
  display: block;
  margin-top: 12px;
  color: rgba(238, 244, 251, 0.72);
  line-height: 1.7;
}

.download-slab {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  gap: 26px;
  align-items: stretch;
  padding-bottom: 120px;
}

.download-copy,
.download-panel {
  border-radius: 34px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(14px);
}

.download-copy {
  padding: 34px;
}

.download-copy h2 {
  margin: 0;
  font-size: clamp(2rem, 3.4vw, 3.4rem);
  line-height: 1.1;
}

.download-copy p:last-of-type {
  max-width: 44rem;
  margin-top: 18px;
}

.download-panel {
  padding: 24px;
  background:
    linear-gradient(180deg, rgba(134, 242, 218, 0.06), rgba(90, 176, 255, 0.03)),
    rgba(255, 255, 255, 0.02);
}

.panel-top {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid rgba(134, 242, 218, 0.18);
  color: rgba(134, 242, 218, 0.95);
  letter-spacing: 0.12em;
  font-size: 0.82rem;
}

.panel-body {
  display: grid;
  gap: 12px;
  margin-top: 24px;
  min-height: 260px;
  align-content: center;
}

.panel-chip {
  padding: 18px 18px;
  border-radius: 22px;
  background: rgba(4, 10, 16, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(238, 244, 251, 0.88);
  text-align: center;
}

.panel-note {
  margin-top: 10px;
  text-align: center;
}

.site-footer {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto 28px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.no-js .reveal {
  opacity: 1;
  transform: none;
}

.js .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms ease, transform 700ms ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1040px) {
  .hero-grid,
  .split-layout,
  .download-slab {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 56px;
  }

  .visual-frame {
    min-height: 520px;
  }

  .highlight-strip,
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .download-panel {
    min-height: 0;
  }
}

@media (max-width: 760px) {
  .no-js .nav-toggle {
    display: none;
  }

  .no-js .site-nav {
    position: static;
    display: grid;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    margin-top: 12px;
  }

  .site-header {
    width: min(var(--max), calc(100% - 20px));
    border-radius: 24px;
    padding: 14px 14px;
  }

  .brand-copy small {
    display: none;
  }

  .nav-toggle {
    display: inline-grid;
    place-items: center;
    margin-left: auto;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    display: grid;
    gap: 8px;
    padding: 14px;
    border-radius: 22px;
    background: rgba(5, 12, 18, 0.96);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .hero {
    width: min(var(--max), calc(100% - 20px));
    padding-top: 42px;
  }

  .section {
    width: min(var(--max), calc(100% - 20px));
  }

  .hero h1 {
    font-size: clamp(2.8rem, 14vw, 4.4rem);
  }

  .highlight-strip,
  .feature-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .visual-frame {
    min-height: 430px;
    border-radius: 28px;
  }

  .visual-caption {
    left: 16px;
    right: 16px;
    bottom: 16px;
    width: auto;
  }

  .visual-caption strong {
    font-size: 1.35rem;
  }

  .feature-slab,
  .split-slab,
  .stats-slab,
  .download-slab {
    padding-top: 92px;
  }

  .download-copy {
    padding: 24px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .timeline-item span {
    width: 52px;
    height: 52px;
  }

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

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

  .reveal,
  .reveal.is-visible,
  .button,
  .site-nav a,
  .nav-toggle,
  .site-nav {
    transition: none !important;
  }
}