:root {
  --bg: #0b1220;
  --surface: #111827;
  --surface-2: #1f2937;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #14b8a6;
  --accent-2: #0ea5e9;
  --border: rgba(255, 255, 255, 0.08);
  --max: 1080px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

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

.container {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(11, 18, 32, 0.85);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.logo span { color: var(--accent); }

.nav {
  display: flex;
  gap: 28px;
  font-size: 0.9rem;
  color: var(--muted);
}

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

/* Hero */
.hero {
  padding: 88px 0 72px;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(20, 184, 166, 0.18), transparent),
    radial-gradient(ellipse 50% 40% at 90% 20%, rgba(14, 165, 233, 0.12), transparent);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(20, 184, 166, 0.12);
  color: var(--accent);
  font-size: 0.85rem;
  margin-bottom: 20px;
  border: 1px solid rgba(20, 184, 166, 0.25);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.25;
  margin-bottom: 20px;
}

.hero-desc {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 540px;
  margin-bottom: 32px;
}

.hero-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
}

.hero-card h3 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--accent);
}

.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat {
  background: var(--surface-2);
  border-radius: 12px;
  padding: 16px;
}

.stat strong {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.stat span { font-size: 0.95rem; }

/* Sections */
section { padding: 72px 0; }

section:nth-child(even) { background: rgba(255, 255, 255, 0.02); }

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-head h2 {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.section-head p { color: var(--muted); }

/* Cards grid */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(20, 184, 166, 0.12);
  color: var(--accent);
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.card p {
  color: var(--muted);
  font-size: 0.92rem;
}

.card ul {
  margin-top: 12px;
  padding-left: 18px;
  color: var(--muted);
  font-size: 0.88rem;
}

.card li { margin-bottom: 6px; }

/* Flow */
.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.flow-step {
  text-align: center;
  padding: 24px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.flow-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
}

.flow-step h4 { font-size: 0.95rem; margin-bottom: 8px; }
.flow-step p { color: var(--muted); font-size: 0.85rem; }

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.about-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
}

.about-box h3 {
  font-size: 1.05rem;
  margin-bottom: 12px;
  color: var(--accent);
}

.about-box p, .about-box li {
  color: var(--muted);
  font-size: 0.92rem;
}

.about-box ul { padding-left: 18px; margin-top: 8px; }
.about-box li { margin-bottom: 6px; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  background: var(--surface);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
}

.footer-brand p {
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 8px;
  max-width: 360px;
}

.footer-meta {
  text-align: right;
  color: var(--muted);
  font-size: 0.85rem;
}

.footer-meta p { margin-bottom: 6px; }

.beian-link {
  color: var(--muted);
  text-decoration: none;
}

.beian-link:hover {
  color: var(--accent);
  text-decoration: underline;
}

@media (max-width: 900px) {
  .hero-grid, .cards, .flow, .about-grid { grid-template-columns: 1fr; }
  .nav { display: none; }
  .footer-meta { text-align: left; }
}