* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: #f8f9fc; color: #333; line-height: 1.6;
}

/* ── Header ── */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid #e8ecf1; padding: 0 24px;
  height: 60px; display: flex; align-items: center; justify-content: space-between;
}
.header-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 700; color: #333; text-decoration: none;
}
.header-logo .logo-icon {
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: bold; color: white; flex-shrink: 0;
}
.header-nav { display: flex; align-items: center; gap: 28px; }
.header-nav a {
  font-size: 14px; color: #666; text-decoration: none; font-weight: 500;
  transition: color 0.2s;
}
.header-nav a:hover { color: #667eea; }
.header-nav .btn-sm {
  padding: 6px 18px; border-radius: 6px; font-size: 13px;
  background: #667eea; color: white; text-decoration: none; font-weight: 500;
  transition: all 0.2s;
}
.header-nav .btn-sm:hover { background: #5a6fd6; }

/* ── Hero ── */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  padding: 100px 24px 80px; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 20% 50%, rgba(102,126,234,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 50%, rgba(118,75,162,0.12) 0%, transparent 60%);
}
.hero-content { position: relative; max-width: 820px; text-align: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 16px; border-radius: 20px;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12);
  font-size: 13px; color: rgba(255,255,255,0.7); margin-bottom: 28px;
}
.hero-badge span { color: #667eea; font-weight: 600; }
.hero-tagline {
  font-size: 18px; color: rgba(255,255,255,0.5); letter-spacing: 6px;
  text-transform: uppercase; margin-bottom: 16px; font-weight: 500;
}
.hero h1 {
  font-size: clamp(36px, 6vw, 60px); font-weight: 800;
  color: white; line-height: 1.15; margin-bottom: 12px;
}
.hero h1 .highlight { background: linear-gradient(135deg, #667eea, #a78bfa); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-slogan {
  font-size: clamp(20px, 3vw, 28px); font-weight: 700;
  color: rgba(255,255,255,0.9); margin-bottom: 20px;
}
.hero-sub {
  font-size: clamp(15px, 2vw, 17px); color: rgba(255,255,255,0.6);
  max-width: 620px; margin: 0 auto 40px; line-height: 1.7;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 10px; font-size: 15px; font-weight: 600;
  text-decoration: none; transition: all 0.25s; cursor: pointer;
}
.hero-btn-primary {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white; box-shadow: 0 8px 24px rgba(102,126,234,0.35);
}
.hero-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(102,126,234,0.45); }
.hero-btn-secondary {
  background: rgba(255,255,255,0.08); color: white;
  border: 1px solid rgba(255,255,255,0.15);
}
.hero-btn-secondary:hover { background: rgba(255,255,255,0.14); }
.hero-stats {
  display: flex; gap: 40px; justify-content: center; margin-top: 50px;
  padding-top: 36px; border-top: 1px solid rgba(255,255,255,0.08);
}
.hero-stat { text-align: center; }
.hero-stat-value { font-size: 28px; font-weight: 800; color: white; }
.hero-stat-label { font-size: 13px; color: rgba(255,255,255,0.45); margin-top: 2px; }

/* ── Sections ── */
.section { padding: 80px 24px; }
.section-dark { background: #1a1a2e; color: rgba(255,255,255,0.85); }
.section-alt { background: #f0f2f7; }
.container { max-width: 1100px; margin: 0 auto; }
.section-title {
  text-align: center; margin-bottom: 56px;
}
.section-title h2 {
  font-size: clamp(26px, 4vw, 34px); font-weight: 800; margin-bottom: 10px;
}
.section-title p {
  font-size: 15px; color: #888; max-width: 580px; margin: 0 auto;
}
.section-dark .section-title p { color: rgba(255,255,255,0.5); }

/* ── Pain Points ── */
.pain-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
@media (max-width: 640px) { .pain-grid { grid-template-columns: 1fr; } }
.pain-card {
  background: white; border-radius: 14px; padding: 28px;
  border: 1px solid #e8ecf1; transition: all 0.25s;
}
.pain-card:hover { border-color: #667eea; box-shadow: 0 4px 20px rgba(102,126,234,0.1); }
.pain-icon { font-size: 32px; margin-bottom: 12px; }
.pain-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.pain-card p { font-size: 14px; color: #777; line-height: 1.6; }

/* ── Features ── */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.feature-card {
  background: rgba(255,255,255,0.04); border-radius: 14px; padding: 32px 28px;
  border: 1px solid rgba(255,255,255,0.08); transition: all 0.25s;
}
.feature-card:hover { border-color: rgba(102,126,234,0.3); background: rgba(255,255,255,0.07); }
.feature-icon {
  width: 48px; height: 48px; border-radius: 12px; margin-bottom: 16px;
  display: flex; align-items: center; justify-content: center; font-size: 22px;
}
.feature-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; color: white; }
.feature-card p { font-size: 14px; color: rgba(255,255,255,0.55); line-height: 1.6; }
.feature-card .tag {
  display: inline-block; padding: 2px 8px; border-radius: 4px;
  font-size: 11px; font-weight: 600; margin-top: 10px;
  background: rgba(102,126,234,0.15); color: #a78bfa;
}

/* ── How it Works ── */
.steps { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.step {
  flex: 1; min-width: 200px; max-width: 300px;
  text-align: center; padding: 32px 20px;
  background: white; border-radius: 14px; border: 1px solid #e8ecf1;
  position: relative;
}
.step-number {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white; font-weight: 800; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px;
}
.step h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.step p { font-size: 14px; color: #777; }
.step-arrow {
  font-size: 28px; color: #d0d5e0; display: flex; align-items: center;
  padding-top: 48px; flex-shrink: 0;
}
@media (max-width: 768px) { .step-arrow { display: none; } }

/* ── Data Security ── */
.security-banner {
  text-align: center; padding: 48px 32px;
  background: linear-gradient(135deg, rgba(102,126,234,0.06), rgba(118,75,162,0.06));
  border-radius: 16px; border: 1px solid rgba(102,126,234,0.12);
  margin-top: 40px;
}
.security-banner h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.security-banner p { font-size: 14px; color: #777; max-width: 500px; margin: 0 auto; }

/* ── Product Forms ── */
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.product-card {
  background: white; border-radius: 14px; padding: 28px;
  border: 1px solid #e8ecf1; text-align: center;
  transition: all 0.25s;
}
.product-card:hover { border-color: #667eea; transform: translateY(-3px); box-shadow: 0 8px 32px rgba(102,126,234,0.12); }
.product-card.featured {
  border-color: #667eea; box-shadow: 0 4px 20px rgba(102,126,234,0.12);
  position: relative;
}
.product-card.featured::before {
  content: '推荐'; position: absolute; top: -10px; left: 50%; transform: translateX(-50%);
  padding: 2px 14px; border-radius: 10px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white; font-size: 11px; font-weight: 700;
}
.product-card .p-icon { font-size: 36px; margin-bottom: 12px; }
.product-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.product-card .p-price { font-size: 13px; color: #667eea; font-weight: 600; margin-bottom: 10px; }
.product-card p { font-size: 14px; color: #777; line-height: 1.6; }

/* ── CTA ── */
.cta-section {
  text-align: center; padding: 72px 24px;
  background: linear-gradient(135deg, #1a1a2e, #16213e);
}
.cta-section h2 { font-size: clamp(24px, 4vw, 32px); font-weight: 800; color: white; margin-bottom: 12px; }
.cta-section p { font-size: 15px; color: rgba(255,255,255,0.55); margin-bottom: 32px; }
.cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ── Footer ── */
.footer {
  background: #1a1a2e; padding: 48px 24px 32px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-inner {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-brand .footer-logo {
  font-size: 18px; font-weight: 700; color: white;
  display: flex; align-items: center; gap: 8px; margin-bottom: 10px;
}
.footer-brand .footer-logo .logo-icon {
  width: 28px; height: 28px; border-radius: 6px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: bold; color: white;
}
.footer-brand p { font-size: 13px; color: rgba(255,255,255,0.4); line-height: 1.6; max-width: 320px; }
.footer-col h4 { font-size: 13px; font-weight: 700; color: rgba(255,255,255,0.7); margin-bottom: 14px; text-transform: uppercase; letter-spacing: 1px; }
.footer-col a {
  display: block; font-size: 13px; color: rgba(255,255,255,0.4);
  text-decoration: none; margin-bottom: 10px; transition: color 0.2s;
}
.footer-col a:hover { color: #667eea; }
.footer-bottom {
  max-width: 1100px; margin: 32px auto 0; padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  font-size: 12px; color: rgba(255,255,255,0.3);
}
@media (max-width: 768px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-brand { grid-column: span 2; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .hero { padding: 80px 20px 60px; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .section { padding: 56px 20px; }
  .header-nav { display: none; }
  .steps { flex-direction: column; align-items: center; }
  .step { max-width: 100%; }
}