:root {
  --bg: #0b0d14;
  --surface: #11141f;
  --surface-2: #161a28;
  --text-primary: #f2f3f7;
  --text-secondary: #9a9fb3;
  --text-muted: #6b7086;
  --border: #232838;
  --accent: #5b8cff;
  --accent-2: #8a5bff;
  --accent-bg: rgba(91,140,255,0.12);
  --success: #2fd996;
  --success-bg: rgba(47,217,150,0.12);
  --pro: #b46bff;
  --pro-bg: rgba(180,107,255,0.12);
  --warning: #ffb84d;
  --warning-bg: rgba(255,184,77,0.12);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
}
a { text-decoration: none; color: inherit; }
.container { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11,13,20,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 500;
}
.nav-logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: inline-block;
}
.nav-links {
  display: flex;
  gap: 28px;
  font-size: 14px;
  color: var(--text-secondary);
}

.hero {
  text-align: center;
  padding: 84px 20px 64px;
  position: relative;
}
.hero-glow {
  position: absolute;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 400px;
  background: radial-gradient(circle, rgba(91,140,255,0.18), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
}
.hero h1 {
  font-size: 40px;
  font-weight: 500;
  margin-bottom: 18px;
  position: relative;
  z-index: 1;
  background: linear-gradient(135deg, #f2f3f7, #9fb3ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p {
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto 32px;
  position: relative;
  z-index: 1;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  position: relative;
  z-index: 1;
}
.btn {
  height: 42px;
  padding: 0 24px;
  border-radius: 10px;
  font-size: 14px;
  cursor: default;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-primary);
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border: none;
  font-weight: 500;
}

.section-title {
  text-align: center;
  font-size: 24px;
  font-weight: 500;
  margin-bottom: 8px;
}
.section-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 36px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 64px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 26px;
  display: block;
  transition: border-color 0.15s;
}
.card:hover { border-color: var(--accent); }
.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.card-icon svg { width: 22px; height: 22px; }
.card h3 {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card h3 .arrow { font-size: 13px; color: var(--text-muted); }
.card p {
  font-size: 13.5px;
  color: var(--text-secondary);
}

.stats {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 16px;
  margin-bottom: 72px;
  text-align: center;
}
.stats .num {
  font-size: 26px;
  font-weight: 500;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stats .label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

footer {
  text-align: center;
  padding: 28px 20px 44px;
  color: var(--text-muted);
  font-size: 12px;
  border-top: 1px solid var(--border);
}

/* detail page */
.breadcrumb {
  font-size: 13px;
  color: var(--text-muted);
  padding: 24px 0 0;
}
.breadcrumb a { color: var(--text-secondary); }
.detail-hero {
  text-align: center;
  padding: 48px 20px 56px;
  position: relative;
}
.detail-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  position: relative;
  z-index: 1;
}
.detail-icon svg { width: 30px; height: 30px; }
.detail-hero h1 {
  font-size: 32px;
  font-weight: 500;
  margin-bottom: 14px;
  position: relative;
  z-index: 1;
}
.detail-hero p {
  color: var(--text-secondary);
  font-size: 15.5px;
  max-width: 560px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 56px;
}
.feature-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  font-size: 14px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.feature-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--accent);
}
.feature-item .ft-body strong {
  display: block;
  font-weight: 500;
  margin-bottom: 4px;
}
.feature-item .ft-body span {
  color: var(--text-secondary);
  font-size: 13px;
}

.usecase-list {
  list-style: none;
  margin-bottom: 56px;
}
.usecase-list li {
  background: var(--surface-2);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}
.usecase-list li strong {
  color: var(--text-primary);
  font-weight: 500;
}

.detail-cta {
  text-align: center;
  padding: 8px 0 64px;
}

@media (max-width: 600px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 28px; }
  .grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
}