:root {
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-secondary: #06b6d4;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-secondary: #f1f5f9;

  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --text-inverse: #ffffff;

  --border: #e2e8f0;
  --border-light: #f1f5f9;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.1);
  --shadow-md: 0 2px 6px rgba(0,0,0,0.15);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.2);
}

* { box-sizing: border-box; }
html, body { padding: 0; margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-primary);
  background: var(--color-bg);
  line-height: 1.6;
}

.container {
  max-width: 1080px;
  padding: 0 var(--space-lg);
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-light);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--text-primary);
}
.brand-logo {
  width: 36px; height: 36px; border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: grid; place-items: center; color: var(--text-inverse); font-weight: 700;
  box-shadow: var(--shadow-sm);
}
.brand-name { font-weight: 700; font-size: 18px; letter-spacing: 0.2px; }

.nav { display: flex; gap: var(--space-lg); }
.nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
}
.nav a:hover { color: var(--text-primary); }

.hero {
  position: relative;
  padding: 72px 0;
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(6,182,212,0.12), transparent 60%),
    radial-gradient(800px 300px at 10% -10%, rgba(99,102,241,0.15), transparent 60%),
    linear-gradient(180deg, #ffffff, #f8fafc);
  overflow: hidden;
}
.hero .container { position: relative; }
.hero-title {
  font-size: 40px;
  line-height: 1.15;
  margin: 0 0 var(--space-md);
  letter-spacing: 0.2px;
}
.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-subtitle {
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 720px;
  margin-bottom: var(--space-xl);
}
.cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.button {
  display: inline-flex; align-items: center; justify-content: center;
  height: 44px; padding: 0 var(--space-lg);
  border-radius: var(--radius-md);
  text-decoration: none; font-weight: 600; font-size: 14px;
  transition: transform .05s ease, box-shadow .2s ease, background .2s ease;
  box-shadow: var(--shadow-sm);
}
.button:active { transform: translateY(1px); }
.button-primary {
  background: var(--color-primary);
  color: var(--text-inverse);
}
.button-primary:hover { background: var(--color-primary-dark); }
.button-secondary {
  background: var(--color-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.button-secondary:hover { background: var(--color-surface-secondary); }

.section {
  padding: 56px 0;
}
.section-title {
  font-size: 28px;
  margin: 0 0 var(--space-sm);
}
.section-subtitle {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
}
.card h3 { margin-top: 0; margin-bottom: var(--space-sm); font-size: 18px; }
.card p { margin: 0; color: var(--text-secondary); font-size: 14px; }
.card .icon {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  margin-bottom: var(--space-md); color: var(--text-inverse); font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.step {
  background: var(--color-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}
.step-index {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 10px;
  background: rgba(99,102,241,0.1); color: var(--color-primary); font-weight: 700;
  margin-bottom: var(--space-sm);
}

.faq {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}
.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}
.faq-item h4 { margin: 0 0 var(--space-sm); }
.faq-item p { margin: 0; color: var(--text-secondary); }

.footer {
  padding: 32px 0;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-light);
  background: #fff;
  font-size: 14px;
}

.badges {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--text-secondary);
  padding: 6px 10px; border-radius: 999px;
  border: 1px solid var(--border-light);
  background: var(--color-surface);
}

@media (max-width: 992px) {
  .features { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .faq { grid-template-columns: 1fr; }
  .hero-title { font-size: 34px; }
}
@media (max-width: 640px) {
  .nav { display: none; }
  .features { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .hero { padding: 56px 0; }
  .hero-title { font-size: 28px; }
}