/* ============ GEO Brand Platform - 仿特赞风格 ============ */
:root {
  --primary: #1A5CFF;
  --primary-dark: #0D47B3;
  --primary-light: #E8F0FF;
  --dark: #0A0E1A;
  --dark2: #141A2B;
  --gray: #6B7280;
  --gray-light: #F3F4F6;
  --border: #E5E7EB;
  --white: #FFFFFF;
  --font-cn: "PingFang SC","Microsoft YaHei",sans-serif;
  --font-en: "Inter","SF Pro Display",-apple-system,sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font-cn); color: var(--dark); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ============ Header ============ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10,14,26,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all 0.3s ease;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.site-header.scrolled { background: rgba(10,14,26,0.98); box-shadow: 0 2px 20px rgba(0,0,0,0.3); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { font-size: 22px; font-weight: 700; color: #fff; letter-spacing: -0.5px; }
.logo span { color: var(--primary); }

.main-nav ul { display: flex; gap: 4px; }
.main-nav ul li a { display: block; padding: 8px 16px; color: rgba(255,255,255,0.8); font-size: 14px; border-radius: 6px; transition: all 0.2s; }
.main-nav ul li a:hover { color: #fff; background: rgba(255,255,255,0.08); }
.main-nav .has-sub { position: relative; }
.main-nav .sub-menu {
  display: none; position: absolute; top: 100%; left: 0; min-width: 180px;
  background: var(--dark2); border-radius: 8px; padding: 8px 0; margin-top: 4px;
  border: 1px solid rgba(255,255,255,0.08); box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.main-nav .has-sub:hover .sub-menu { display: block; }

.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-switch { color: rgba(255,255,255,0.7); font-size: 13px; padding: 6px 10px; border-radius: 6px; transition: all 0.2s; }
.lang-switch:hover { color: #fff; background: rgba(255,255,255,0.08); }
.mobile-toggle { display: none; background: none; border: none; color: #fff; font-size: 20px; cursor: pointer; }

/* ============ Buttons ============ */
.btn { display: inline-flex; align-items: center; gap: 6px; font-weight: 500; border-radius: 8px; transition: all 0.3s; cursor: pointer; border: none; font-family: inherit; }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-md { padding: 12px 28px; font-size: 15px; }
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 8px 25px rgba(26,92,255,0.3); }
.btn-outline { background: transparent; color: rgba(255,255,255,0.9); border: 1px solid rgba(255,255,255,0.2); }
.btn-outline:hover { border-color: var(--primary); color: #fff; background: rgba(26,92,255,0.1); }
.btn-white { background: #fff; color: var(--dark); }
.btn-white:hover { background: #f0f0f0; }

/* ============ Hero Section ============ */
.hero-section {
  min-height: 100vh; display: flex; align-items: center;
  background: linear-gradient(135deg, #0A0E1A 0%, #141A2B 50%, #0D1B3E 100%);
  position: relative; overflow: hidden; padding: 120px 0 80px;
}
.hero-section::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(26,92,255,0.08) 0%, transparent 50%),
              radial-gradient(circle at 70% 30%, rgba(0,200,255,0.05) 0%, transparent 40%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}
@keyframes heroGlow {
  0% { transform: translate(0, 0); }
  100% { transform: translate(-2%, -2%); }
}
.hero-content { position: relative; z-index: 1; max-width: 800px; margin: 0 auto; text-align: center; }
.hero-badge {
  display: inline-block; padding: 6px 16px; border-radius: 100px;
  background: rgba(26,92,255,0.15); color: var(--primary); font-size: 13px; font-weight: 500;
  margin-bottom: 24px; border: 1px solid rgba(26,92,255,0.2);
}
.hero-title { font-size: clamp(36px, 6vw, 64px); font-weight: 700; color: #fff; line-height: 1.15; letter-spacing: -1px; margin-bottom: 20px; }
.hero-subtitle { font-size: clamp(16px, 2vw, 20px); color: rgba(255,255,255,0.6); line-height: 1.7; margin-bottom: 36px; max-width: 640px; margin-left: auto; margin-right: auto; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.scroll-indicator { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); color: rgba(255,255,255,0.3); font-size: 13px; animation: scrollBounce 2s infinite; }
@keyframes scrollBounce { 0%,100%{transform:translateX(-50%) translateY(0)} 50%{transform:translateX(-50%) translateY(8px)} }

/* ============ Sections ============ */
.section { padding: 100px 0; }
.section-dark { background: var(--dark); color: #fff; }
.section-gray { background: var(--gray-light); }
.section-header { text-align: center; max-width: 700px; margin: 0 auto 60px; }
.section-tag { display: inline-block; padding: 4px 12px; border-radius: 100px; background: var(--primary-light); color: var(--primary); font-size: 12px; font-weight: 600; margin-bottom: 16px; }
.section-title { font-size: clamp(28px, 3.5vw, 40px); font-weight: 700; margin-bottom: 16px; letter-spacing: -0.5px; }
.section-desc { font-size: 16px; color: var(--gray); line-height: 1.7; }

/* ============ System of Context ============ */
.system-context {
  text-align: center; padding: 80px 0;
  background: linear-gradient(180deg, var(--dark) 0%, #0F1628 100%);
  color: #fff;
}
.system-context h2 { font-size: 32px; margin-bottom: 12px; }
.system-context p { color: rgba(255,255,255,0.6); max-width: 600px; margin: 0 auto 40px; }
.context-visual { max-width: 800px; margin: 0 auto; border-radius: 16px; background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06); padding: 40px; }

/* ============ GEA Grid ============ */
.gea-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.gea-card {
  background: #fff; border-radius: 12px; padding: 32px 24px; text-align: center;
  border: 1px solid var(--border); transition: all 0.3s;
}
.gea-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.08); border-color: var(--primary); }
.gea-card .icon { width: 48px; height: 48px; margin: 0 auto 16px; background: var(--primary-light); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 20px; color: var(--primary); }
.gea-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.gea-card p { font-size: 13px; color: var(--gray); line-height: 1.6; }

/* ============ Client Logo Wall ============ */
.client-wall { overflow: hidden; padding: 40px 0; }
.client-track { display: flex; gap: 40px; animation: scrollLogos 30s linear infinite; width: max-content; }
.client-track:hover { animation-play-state: paused; }
.client-track img, .client-track .logo-item { height: 32px; opacity: 0.5; transition: opacity 0.3s; filter: grayscale(1); }
.client-track .logo-item:hover { opacity: 1; filter: grayscale(0); }
@keyframes scrollLogos {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ============ Industry Cards ============ */
.industry-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.industry-card {
  background: #fff; border-radius: 12px; padding: 32px; text-align: center;
  border: 1px solid var(--border); transition: all 0.3s; cursor: pointer;
}
.industry-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.08); }
.industry-card .icon { font-size: 32px; color: var(--primary); margin-bottom: 12px; }
.industry-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.industry-card p { font-size: 13px; color: var(--gray); }

/* ============ Case Cards ============ */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.case-card {
  background: #fff; border-radius: 12px; overflow: hidden; border: 1px solid var(--border);
  transition: all 0.3s;
}
.case-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.08); }
.case-card .cover { height: 200px; background: var(--gray-light); display: flex; align-items: center; justify-content: center; color: var(--gray); font-size: 40px; overflow: hidden; }
.case-card .cover img { width: 100%; height: 100%; object-fit: cover; }
.case-card .body { padding: 24px; }
.case-card .body h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.case-card .body p { font-size: 13px; color: var(--gray); line-height: 1.6; }
.case-card .client-tag { display: inline-block; padding: 2px 8px; background: var(--primary-light); color: var(--primary); font-size: 12px; border-radius: 4px; margin-top: 12px; }

/* ============ News ============ */
.news-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.news-card {
  background: #fff; border-radius: 12px; padding: 28px;
  border: 1px solid var(--border); transition: all 0.3s;
}
.news-card:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,0.06); }
.news-card .meta { font-size: 12px; color: var(--gray); margin-bottom: 12px; }
.news-card .meta span { background: var(--primary-light); color: var(--primary); padding: 2px 8px; border-radius: 4px; margin-right: 8px; }
.news-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 10px; line-height: 1.5; }
.news-card p { font-size: 13px; color: var(--gray); line-height: 1.6; }
.news-card .read-more { color: var(--primary); font-size: 13px; margin-top: 12px; display: inline-block; }

/* ============ CTA Section ============ */
.cta-section {
  padding: 100px 0; text-align: center;
  background: linear-gradient(135deg, var(--primary) 0%, #0D47B3 100%);
  color: #fff;
}
.cta-section h2 { font-size: clamp(28px, 4vw, 44px); font-weight: 700; margin-bottom: 16px; }
.cta-section p { font-size: 18px; opacity: 0.85; margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* ============ Footer ============ */
.site-footer { background: var(--dark); color: rgba(255,255,255,0.6); padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-col h4 { color: #fff; font-size: 14px; font-weight: 600; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--primary); }
.footer-col p { font-size: 13px; line-height: 1.7; }
.social-links { display: flex; gap: 12px; }
.social-links a { width: 36px; height: 36px; border-radius: 8px; background: rgba(255,255,255,0.06); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.5); transition: all 0.2s; }
.social-links a:hover { background: var(--primary); color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 20px; text-align: center; font-size: 13px; }

/* ============ Animations ============ */
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: all 0.6s ease; }
.animate-in { opacity: 1; transform: translateY(0); }

/* ============ Responsive ============ */
@media (max-width: 768px) {
  .main-nav { display: none; position: fixed; top: 72px; left: 0; right: 0; background: var(--dark); padding: 20px; }
  .main-nav.active { display: block; }
  .main-nav ul { flex-direction: column; }
  .main-nav .sub-menu { position: static; display: none; box-shadow: none; background: transparent; padding-left: 20px; }
  .main-nav .has-child.active .sub-menu { display: block; }
  .mobile-toggle { display: block; }
  .header-actions .btn:not(.lang-switch) { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .gea-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-actions { flex-direction: column; align-items: center; }
}