:root {
  --bg: #06080f;
  --bg-2: #0c1222;
  --surface: rgba(18, 24, 40, 0.72);
  --surface-2: rgba(15, 20, 34, 0.9);
  --border: rgba(86, 120, 180, 0.35);
  --text: #e9f0ff;
  --muted: #a9b6d5;
  --accent: #3cf0d2;
  --accent-2: #4aa8ff;
  --accent-3: #ffd166;
  --shadow: 0 30px 80px rgba(5, 9, 20, 0.55);
  --glow: 0 0 35px rgba(60, 240, 210, 0.25);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Plus Jakarta Sans", "Noto Sans SC", "PingFang SC", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 10% 20%, rgba(74, 168, 255, 0.18), transparent 45%),
    radial-gradient(circle at 80% 10%, rgba(60, 240, 210, 0.14), transparent 48%),
    radial-gradient(circle at 70% 80%, rgba(255, 209, 102, 0.12), transparent 40%),
    linear-gradient(135deg, var(--bg), var(--bg-2));
  min-height: 100vh;
  overflow-x: hidden;
}

[data-lang] {
  display: none;
}

body.lang-zh [data-lang="zh"],
body.lang-en [data-lang="en"] {
  display: block;
}

body.lang-zh [data-lang="zh"][data-inline="true"],
body.lang-en [data-lang="en"][data-inline="true"] {
  display: inline;
}

body.lang-zh [data-lang="zh"][data-inline="flex"],
body.lang-en [data-lang="en"][data-inline="flex"] {
  display: inline-flex;
}

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

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

.container {
  width: min(var(--max-width), 92vw);
  margin: 0 auto;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at top, black 25%, transparent 70%);
  opacity: 0.35;
  z-index: 0;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(16px);
  background: rgba(6, 8, 15, 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  letter-spacing: 0.6px;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(74, 168, 255, 0.9), rgba(60, 240, 210, 0.9));
  box-shadow: var(--glow);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: #07101a;
}

.nav-links {
  display: flex;
  gap: 22px;
  font-size: 0.95rem;
  color: var(--muted);
}

.nav-links a {
  transition: color 0.25s ease;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-toggle {
  padding: 8px 14px;
  font-size: 0.85rem;
}

.button {
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  letter-spacing: 0.2px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border 0.2s ease;
}

.button.primary {
  background: linear-gradient(135deg, rgba(74, 168, 255, 0.9), rgba(60, 240, 210, 0.9));
  color: #07101a;
  box-shadow: 0 18px 45px rgba(50, 200, 255, 0.35);
}

.button.ghost {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.14);
  color: var(--text);
}

.button:hover {
  transform: translateY(-1px);
}

.hero {
  position: relative;
  padding: 90px 0 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 48px;
  align-items: center;
}

.hero h1 {
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  font-size: clamp(2.6rem, 4vw, 4rem);
  margin: 0 0 18px;
}

.hero p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--muted);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 32px;
}

.badge {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.06);
  font-size: 0.85rem;
  color: var(--muted);
}

.hero-card {
  padding: 26px;
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow);
}

.hero-card h3 {
  margin: 0 0 12px;
  font-size: 1.2rem;
}

.hero-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
  color: var(--muted);
}

.hero-card li {
  display: flex;
  gap: 10px;
  align-items: center;
}

.hero-card .tag {
  color: var(--accent);
  font-weight: 600;
}

.section {
  padding: 70px 0;
  position: relative;
}

.section-title {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 32px;
}

.section-title h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
}

.section-title p {
  margin: 0;
  max-width: 480px;
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--surface-2);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 24px 50px rgba(6, 10, 20, 0.55);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(74, 168, 255, 0.12), transparent 60%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  margin: 0 0 12px;
}

.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 18px;
}

.kpi {
  padding: 18px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(9, 13, 23, 0.7);
  text-align: left;
}

.kpi strong {
  font-size: 1.4rem;
  display: block;
  margin-bottom: 6px;
  color: var(--accent-2);
}

.timeline {
  display: grid;
  gap: 16px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 16px;
  padding: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(10, 15, 28, 0.6);
}

.timeline-step {
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.highlight {
  color: var(--accent);
  font-weight: 600;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.info-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
  color: var(--muted);
}

.info-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.info-list .label {
  color: var(--accent-3);
  font-weight: 600;
}

.cta {
  padding: 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(60, 240, 210, 0.14), rgba(74, 168, 255, 0.14));
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: grid;
  gap: 12px;
}

footer {
  padding: 30px 0 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.footer-links {
  display: grid;
  gap: 8px;
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--text);
}

.page-hero {
  padding: 80px 0 40px;
}

.page-hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 3vw, 2.8rem);
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
}

.page-content {
  padding-bottom: 60px;
  color: var(--muted);
  line-height: 1.9;
}

.page-content h2 {
  color: var(--text);
  margin-top: 32px;
  margin-bottom: 12px;
  font-size: 1.3rem;
}

.page-content ul {
  padding-left: 18px;
}

.page-content li {
  margin-bottom: 8px;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
}

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .split {
    grid-template-columns: 1fr;
  }

  .nav-links {
    position: absolute;
    top: 64px;
    right: 4vw;
    flex-direction: column;
    background: rgba(8, 12, 22, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 18px;
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

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

@media (max-width: 640px) {
  .nav {
    padding: 14px 0;
  }

  .hero {
    padding-top: 70px;
  }

  .button {
    padding: 10px 18px;
  }
}