/* ========================================
   Sunsealink · 盛世网络 - 全局样式
   深空科技风：#0A0F1A + #00D2FF
   ======================================== */

/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg-deep: #050B14;
  --bg-card: rgba(18, 25, 40, 0.75);
  --primary: #00D2FF;
  --primary-dark: #0077B6;
  --accent-glow: rgba(0, 210, 255, 0.2);
  --text-primary: #F0F4FA;
  --text-secondary: #9AA6BF;
  --border-dim: rgba(0, 210, 255, 0.15);
}
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: radial-gradient(circle at 20% 10%, #0B1422 0%, var(--bg-deep) 100%);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: 0.2s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 32px; }

/* === Scrollbar === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #111827; }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 8px; }

/* === Buttons === */
.btn-primary {
  background: linear-gradient(95deg, #00D2FF 0%, #0077B6 100%);
  border: none; padding: 14px 34px; border-radius: 40px;
  font-weight: 600; font-size: 0.95rem; color: #050B14;
  cursor: pointer; transition: all 0.3s ease; display: inline-flex;
  align-items: center; gap: 8px; box-shadow: 0 8px 20px rgba(0,210,255,0.25);
}
.btn-primary:hover {
  transform: translateY(-2px); box-shadow: 0 14px 28px rgba(0,210,255,0.4);
  background: linear-gradient(95deg, #00E5FF 0%, #0088CC 100%); color: #000;
}
.btn-outline {
  background: transparent; border: 1.5px solid rgba(0,210,255,0.6);
  color: var(--primary); padding: 12px 30px; border-radius: 40px;
  font-weight: 500; transition: 0.25s; display: inline-flex;
  align-items: center; gap: 8px; backdrop-filter: blur(4px);
}
.btn-outline:hover { background: rgba(0,210,255,0.1); border-color: var(--primary); transform: translateY(-2px); color: #fff; }

/* === Navigation === */
.navbar {
  padding: 20px 0; position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(12px); background: rgba(5,11,20,0.85);
  border-bottom: 1px solid var(--border-dim);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo i { font-size: 2rem; color: var(--primary); filter: drop-shadow(0 0 6px rgba(0,210,255,0.5)); }
.logo-text {
  font-size: 1.6rem; font-weight: 800; letter-spacing: -0.5px;
  background: linear-gradient(135deg, #FFFFFF, var(--primary)); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.logo-sub { font-size: 0.7rem; color: var(--primary); letter-spacing: 0.5px; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--text-secondary); font-weight: 500; font-size: 0.9rem; padding: 8px 0; position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px;
  background: var(--primary); border-radius: 2px;
}
.nav-cta { background: rgba(0,210,255,0.12); border: 1px solid rgba(0,210,255,0.4) !important; padding: 10px 40px !important; border-radius: 40px; color: var(--primary) !important; font-weight: 700; font-size: 1rem !important; white-space: nowrap; min-width: 105px !important; text-align: center; display: inline-block !important; }
.nav-cta:hover { background: var(--primary); color: #050B14 !important; border-color: var(--primary); }

/* === Section Base === */
.section { padding: 100px 0; position: relative; }
.section-dark { background: rgba(8, 14, 24, 0.6); border-top: 1px solid var(--border-dim); border-bottom: 1px solid var(--border-dim); }
.section-header { text-align: center; max-width: 700px; margin: 0 auto 64px; }
.section-header .tag {
  display: inline-block; background: rgba(0,210,255,0.12); padding: 6px 18px;
  border-radius: 40px; font-size: 0.8rem; font-weight: 600; color: var(--primary);
  margin-bottom: 16px; border: 0.5px solid rgba(0,210,255,0.25);
}
.section-header h2 { font-size: 2.5rem; font-weight: 800; margin-bottom: 16px; letter-spacing: -0.02em; }
.section-header p { font-size: 1.05rem; color: var(--text-secondary); }

/* === Hero === */
.hero { padding: 100px 0 120px; position: relative; overflow: hidden; }
.hero-bg-glow {
  position: absolute; width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(0,210,255,0.1) 0%, rgba(0,0,0,0) 70%);
  top: -200px; right: -200px; z-index: 0;
}
.hero-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 2; }
.hero-tag {
  display: inline-block; background: rgba(0,210,255,0.12); padding: 6px 18px;
  border-radius: 40px; font-size: 0.8rem; font-weight: 600; color: var(--primary);
  margin-bottom: 20px; border: 0.5px solid rgba(0,210,255,0.25);
}
.hero h1 { font-size: 3.8rem; font-weight: 800; line-height: 1.1; letter-spacing: -0.03em; margin-bottom: 24px;
  background: linear-gradient(135deg, #FFFFFF, #A0E9FF); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-desc { font-size: 1.1rem; color: var(--text-secondary); max-width: 520px; margin-bottom: 36px; }
.hero-stats { display: flex; gap: 48px; margin-top: 48px; }
.stat-number { font-size: 2.5rem; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 0.9rem; color: var(--text-secondary); }
.hero-right {
  background: var(--bg-card); backdrop-filter: blur(10px); border-radius: 48px; padding: 40px 36px;
  border: 1px solid var(--border-dim); box-shadow: 0 30px 40px -20px rgba(0,0,0,0.5);
}
.feature-item { display: flex; gap: 16px; align-items: center; padding: 16px 0; border-bottom: 1px solid var(--border-dim); }
.feature-item:last-child { border-bottom: none; }
.feature-icon { width: 48px; height: 48px; background: rgba(0,210,255,0.1); border-radius: 28px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; color: var(--primary); }
.feature-text h4 { font-weight: 700; margin-bottom: 4px; }
.feature-text p { font-size: 0.85rem; color: var(--text-secondary); }

/* === Cards === */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 32px; }
.card {
  background: var(--bg-card); backdrop-filter: blur(8px); border-radius: 32px; padding: 36px 28px;
  border: 1px solid var(--border-dim); transition: all 0.35s;
}
.card:hover { transform: translateY(-8px); border-color: var(--primary); background: rgba(15, 25, 50, 0.8); box-shadow: 0 20px 35px -12px rgba(0,210,255,0.2); }
.card-icon { font-size: 2.8rem; color: var(--primary); margin-bottom: 24px; }
.card h3 { font-size: 1.4rem; margin-bottom: 12px; }
.card p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 24px; }
.card-link { color: var(--primary); font-weight: 600; display: inline-flex; align-items: center; gap: 8px; }

/* === Metrics === */
.metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.metric-card { background: rgba(10, 18, 30, 0.7); border-radius: 28px; padding: 28px 20px; text-align: center; border: 1px solid var(--border-dim); transition: 0.2s; }
.metric-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.metric-number { font-size: 2.5rem; font-weight: 800; color: var(--primary); margin-bottom: 8px; }
.metric-label { font-size: 0.85rem; color: var(--text-secondary); }

/* === Clients Wall === */
.clients-section { padding: 60px 0; background: rgba(5, 11, 20, 0.5); border-top: 1px solid var(--border-dim); border-bottom: 1px solid var(--border-dim); }
.clients-label { text-align: center; color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 32px; letter-spacing: 1px; text-transform: uppercase; }
.clients-logos { display: flex; justify-content: center; gap: 48px; flex-wrap: wrap; opacity: 0.6; }
.client-logo { font-size: 1.2rem; font-weight: 700; color: var(--text-secondary); padding: 12px 24px; border: 1px solid var(--border-dim); border-radius: 12px; }

/* === Testimonials === */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.testimonial-card { background: var(--bg-card); border-radius: 24px; padding: 32px; border: 1px solid var(--border-dim); }
.stars { color: #FFC107; margin-bottom: 16px; font-size: 1.1rem; }
.testimonial-text { color: var(--text-secondary); margin-bottom: 24px; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.author-avatar { width: 48px; height: 48px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--primary-dark)); display: flex; align-items: center; justify-content: center; font-weight: 700; color: #050B14; }
.author-info .name { font-weight: 600; }
.author-info .role { font-size: 0.8rem; color: var(--text-secondary); }

/* === CTA Banner === */
.cta-banner { padding: 90px 0; background: linear-gradient(115deg, #07121F 0%, #0B1A2E 100%); border-top: 1px solid var(--border-dim); border-bottom: 1px solid var(--border-dim); }
.cta-container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 40px; }
.cta-content h2 { font-size: 2.4rem; font-weight: 800; margin-bottom: 12px; }
.cta-content p { color: var(--text-secondary); max-width: 500px; }
.cta-actions { display: flex; gap: 20px; flex-wrap: wrap; }

/* === Footer === */
.footer { padding: 70px 0 40px; background: #03070F; border-top: 1px solid var(--border-dim); }
.footer-grid { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 48px; }
.footer-col h4 { font-size: 1rem; margin-bottom: 20px; color: #fff; }
.footer-col a { display: block; color: var(--text-secondary); margin-bottom: 14px; font-size: 0.9rem; }
.footer-col a:hover { color: var(--primary); }
.footer-copyright { text-align: center; margin-top: 60px; padding-top: 30px; border-top: 1px solid var(--border-dim); color: #5D6F8F; font-size: 0.85rem; }

/* === Responsive === */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2.8rem; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 16px; flex-wrap: wrap; justify-content: center; }
  .container { padding: 0 20px; }
  .cta-container { flex-direction: column; text-align: center; }
  .cta-actions { justify-content: center; }
}
@media (max-width: 550px) {
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .metrics-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .clients-logos { gap: 16px; }
}