/* 基础样式 */
:root {
  --bg: #141720;
  --bg-alt: #1a1f2e;
  --elev: #1f2535;
  --text: #e7ecf3;
  --muted: #a5b0c2;
  --primary: #3b82f6;
  --primary-600: #2563eb;
  --accent-red: #ef4444;
  --accent-red-600: #dc2626;
  --ring: rgba(59, 130, 246, 0.4);
  --ring-red: rgba(239, 68, 68, 0.4);
  --border: #2d3548;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% -10%, rgba(59, 130, 246, 0.2) 0%, transparent 60%),
              radial-gradient(1000px 500px at 80% 10%, rgba(239, 68, 68, 0.15) 0%, transparent 60%),
              radial-gradient(800px 400px at 50% 50%, rgba(27, 35, 50, 0.6) 0%, transparent 60%),
              var(--bg);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 头部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(20, 23, 32, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(59, 130, 246, 0.1), 0 1px 0 rgba(239, 68, 68, 0.05);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
}

.brand-logo {
  display: inline-block;
  width: 48px;
  height: 48px;
  object-fit: contain;
  padding: 6px;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 12px;
  border: 2px solid rgba(59, 130, 246, 0.5);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5),
              0 0 20px rgba(59, 130, 246, 0.4),
              0 0 10px rgba(239, 68, 68, 0.3);
  transition: all 0.3s ease;
}
.brand:hover .brand-logo {
  background: rgba(255, 255, 255, 1);
  border-color: rgba(59, 130, 246, 0.8);
  box-shadow: 0 6px 30px rgba(0, 0, 0, 0.6),
              0 0 30px rgba(59, 130, 246, 0.6),
              0 0 15px rgba(239, 68, 68, 0.5);
  transform: scale(1.05);
}

.brand-text { font-weight: 600; }

.site-nav ul {
  display: flex;
  gap: 18px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 8px;
}

.site-nav a:hover,
.site-nav a:focus {
  color: var(--text);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(239, 68, 68, 0.1));
  outline: none;
  box-shadow: 0 0 8px rgba(59, 130, 246, 0.2);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 6px 10px;
}

/* 英雄区 */
.hero {
  padding: 100px 0 80px;
  background: radial-gradient(800px 400px at 25% 0%, rgba(59, 130, 246, 0.12), transparent 70%),
              radial-gradient(600px 300px at 75% 0%, rgba(239, 68, 68, 0.1), transparent 70%),
              linear-gradient(180deg, rgba(255,255,255,0.02), transparent 30%);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  text-align: center;
}

.hero h1 {
  font-size: 40px;
  line-height: 1.15;
  margin: 0 0 12px;
}

.subtitle {
  margin: 0 auto 28px;
  max-width: 720px;
  color: var(--muted);
  font-size: 16px;
}

.hero-cta { display: inline-flex; gap: 12px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 16px;
  border-radius: 10px;
  text-decoration: none;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent-red));
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3), 0 2px 4px rgba(239, 68, 68, 0.2);
}
.btn-primary:hover { 
  background: linear-gradient(135deg, var(--primary-600), var(--accent-red-600));
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4), 0 4px 8px rgba(239, 68, 68, 0.3);
}

.btn-secondary {
  background: rgba(255,255,255,0.04);
}

/* 常规区块 */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

h2 {
  font-size: 28px;
  margin: 0 0 24px;
}

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature { background: var(--elev); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.feature h3 { margin: 0 0 8px; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); }

.company-profile { background: var(--elev); border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin-top: 16px; }
.company-profile h3 { margin: 0 0 8px; font-size: 18px; }
.company-profile ul { margin: 0; padding-left: 18px; color: var(--muted); }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { 
  background: var(--elev); 
  border: 1px solid var(--border); 
  border-radius: 12px; 
  padding: 16px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15), 0 0 0 1px rgba(239, 68, 68, 0.1);
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0 0 12px; color: var(--muted); }
.card ul { margin: 0; padding-left: 18px; color: var(--muted); }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stat { background: var(--elev); border: 1px solid var(--border); border-radius: 12px; padding: 16px; text-align: center; }
.stat-number { font-size: 24px; font-weight: 700; }
.stat-label { color: var(--muted); }

.contact-wrap { display: grid; grid-template-columns: 1.2fr 1fr; gap: 20px; }
.contact-info { background: var(--elev); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.contact-info h3 { margin: 0 0 8px; font-size: 18px; }

.contact-form { background: var(--elev); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.form-row { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.form-row label { font-weight: 500; }
.form-row input, .form-row textarea {
  background: #1a1f2e;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}
.form-row input:focus, .form-row textarea:focus { box-shadow: 0 0 0 3px var(--ring); }
.error { color: #ff8080; min-height: 16px; }
.form-tip { color: var(--muted); margin-top: 10px; }

/* 页脚 */
.site-footer { border-top: 1px solid var(--border); background: #12151d; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; padding: 20px 0; color: var(--muted); }
.footer-inner a { color: var(--muted); text-decoration: none; }
.footer-inner a:hover { color: var(--text); }
.footer-nav { display: inline-flex; gap: 12px; }
.footer-nav a { color: var(--muted); text-decoration: none; }
.footer-nav a:hover { color: var(--text); }

/* 响应式 */
@media (max-width: 960px) {
  .features, .cards, .stats { grid-template-columns: repeat(2, 1fr); }
  .contact-wrap { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .site-nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; gap: 0; }
  .site-nav a { display: block; padding: 12px 16px; border-radius: 0; border-top: 1px solid var(--border); }
  .nav-toggle { display: inline-flex; }
  .features, .cards, .stats { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
}