/* ===== 青青网络 全局样式 ===== */
:root {
  --primary: #1a7f5a;
  --primary-dark: #0f5a3f;
  --primary-light: #e8f5ef;
  --accent: #f5a623;
  --accent-dark: #e0941e;
  --text: #1a2b22;
  --text-light: #5a6b62;
  --bg: #ffffff;
  --bg-light: #f8faf9;
  --bg-dark: #0f2a1f;
  --border: #e2e8e4;
  --shadow: 0 2px 20px rgba(26,127,90,0.08);
  --shadow-hover: 0 8px 30px rgba(26,127,90,0.15);
  --radius: 12px;
  --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }

ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== 头部 ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.4rem; font-weight: 700; color: var(--primary); }
.logo-icon { font-size: 1.8rem; }
.logo-text { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.main-nav ul { display: flex; gap: 28px; align-items: center; }
.main-nav a { color: var(--text); font-weight: 500; font-size: 0.95rem; position: relative; }
.main-nav a:hover { color: var(--primary); }
.main-nav a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
  background: var(--primary); transition: var(--transition);
}
.main-nav a:hover::after { width: 100%; }
.mobile-menu-btn {
  display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 5px;
}
.mobile-menu-btn span { width: 25px; height: 2px; background: var(--primary); border-radius: 2px; transition: var(--transition); }

/* ===== Hero ===== */
.hero {
  margin-top: 70px;
  min-height: 90vh;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #0f2a1f 0%, #1a7f5a 50%, #0f5a3f 100%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%; width: 80%; height: 150%;
  background: radial-gradient(ellipse, rgba(245,166,35,0.1) 0%, transparent 70%);
}
.hero::after {
  content: ''; position: absolute; bottom: -30%; left: -10%; width: 60%; height: 100%;
  background: radial-gradient(ellipse, rgba(26,127,90,0.3) 0%, transparent 60%);
}
.hero .container { position: relative; z-index: 2; text-align: center; }
.hero h1 {
  font-size: clamp(1.8rem, 5vw, 3.5rem);
  color: #fff; font-weight: 800; line-height: 1.3; margin-bottom: 20px;
}
.hero h1 span { color: var(--accent); }
.hero .subtitle { font-size: clamp(1rem, 2.5vw, 1.3rem); color: rgba(255,255,255,0.85); margin-bottom: 35px; max-width: 700px; margin-left: auto; margin-right: auto; }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 25px; }
.hero-meta { color: rgba(255,255,255,0.6); font-size: 0.9rem; }

/* ===== Buttons ===== */
.btn {
  display: inline-block; padding: 14px 32px; border-radius: 50px;
  font-weight: 600; font-size: 1rem; cursor: pointer; border: none;
  transition: var(--transition); text-align: center;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 4px 15px rgba(245,166,35,0.4); }
.btn-primary:hover { background: var(--accent-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(245,166,35,0.5); }
.btn-secondary { background: rgba(255,255,255,0.15); color: #fff; border: 1px solid rgba(255,255,255,0.3); backdrop-filter: blur(5px); }
.btn-secondary:hover { background: rgba(255,255,255,0.25); color: #fff; transform: translateY(-2px); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

/* ===== Section ===== */
section { padding: 80px 0; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); font-weight: 700; color: var(--text); margin-bottom: 10px; }
.section-title p { color: var(--text-light); font-size: 1.05rem; }

/* ===== Trust Bar ===== */
.trust-bar { background: var(--primary-light); padding: 20px 0; }
.trust-bar ul { display: flex; justify-content: space-around; flex-wrap: wrap; gap: 15px; }
.trust-bar li { color: var(--primary-dark); font-weight: 600; font-size: 0.95rem; }

/* ===== Services ===== */
.services { background: var(--bg-light); }
.service-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.service-card {
  background: #fff; border-radius: var(--radius); padding: 35px 30px;
  box-shadow: var(--shadow); transition: var(--transition); border: 1px solid var(--border);
}
.service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); border-color: var(--primary); }
.service-icon { font-size: 2.5rem; margin-bottom: 15px; }
.service-card h3 { font-size: 1.3rem; margin-bottom: 12px; color: var(--text); }
.service-card p { color: var(--text-light); margin-bottom: 15px; font-size: 0.95rem; }
.service-card a { font-weight: 600; font-size: 0.9rem; }

/* ===== Region ===== */
.region-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
@media (max-width: 768px) { .region-grid { grid-template-columns: 1fr; } }
.region-card {
  background: #fff; border-radius: var(--radius); padding: 30px;
  box-shadow: var(--shadow); border-left: 4px solid var(--primary);
}
.region-card h3 { font-size: 1.2rem; margin-bottom: 10px; color: var(--primary-dark); }
.region-card p { color: var(--text-light); font-size: 0.95rem; }

/* ===== Proof Stats ===== */
.proof { background: linear-gradient(135deg, #0f2a1f, #1a7f5a); color: #fff; }
.proof .section-title h2 { color: #fff; }
.proof .section-title p { color: rgba(255,255,255,0.7); }
.proof-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; text-align: center; margin-bottom: 30px; }
@media (max-width: 768px) { .proof-stats { grid-template-columns: repeat(2, 1fr); } }
.stat .number { display: block; font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; color: var(--accent); }
.stat .label { color: rgba(255,255,255,0.8); font-size: 0.9rem; }
.proof-note { text-align: center; color: rgba(255,255,255,0.5); font-size: 0.85rem; }

/* ===== FAQ ===== */
.faq { background: var(--bg-light); }
.faq-item {
  background: #fff; border-radius: var(--radius); margin-bottom: 12px;
  box-shadow: var(--shadow); overflow: hidden; border: 1px solid var(--border);
}
.faq-item summary {
  padding: 20px 25px; cursor: pointer; font-weight: 600; font-size: 1rem;
  position: relative; list-style: none; color: var(--text);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; position: absolute; right: 25px; font-size: 1.3rem; color: var(--primary); transition: var(--transition); }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p { padding: 0 25px 20px; color: var(--text-light); font-size: 0.95rem; }

/* ===== Features ===== */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 25px; }
.feature-card { text-align: center; padding: 25px; }
.feature-card .feat-icon { font-size: 2.5rem; margin-bottom: 12px; }
.feature-card h4 { font-size: 1.1rem; margin-bottom: 8px; color: var(--text); }
.feature-card p { color: var(--text-light); font-size: 0.9rem; }

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  text-align: center; color: #fff; padding: 60px 20px;
}
.cta-section h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: 15px; }
.cta-section p { color: rgba(255,255,255,0.85); margin-bottom: 25px; font-size: 1.05rem; }
.cta-section .btn-primary { background: #fff; color: var(--primary); }
.cta-section .btn-primary:hover { background: var(--accent); color: #fff; }

/* ===== Footer ===== */
.site-footer { background: var(--bg-dark); color: rgba(255,255,255,0.6); padding: 50px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 30px; }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-brand h3 { color: #fff; font-size: 1.3rem; margin-bottom: 10px; }
.footer-brand p { font-size: 0.9rem; }
.footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 15px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col a { color: rgba(255,255,255,0.6); font-size: 0.9rem; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 20px; text-align: center; font-size: 0.85rem; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .main-nav { display: none; position: fixed; top: 70px; left: 0; right: 0; background: #fff; box-shadow: var(--shadow); padding: 20px; }
  .main-nav.active { display: block; }
  .main-nav ul { flex-direction: column; gap: 15px; }
  .mobile-menu-btn { display: flex; }
}
@media (max-width: 480px) {
  section { padding: 50px 0; }
  .hero { min-height: 70vh; }
}
.hero-globe {
  position: absolute;
  right: -40px;
  top: 50%;
  transform: translateY(-50%);
  width: 400px;
  height: 400px;
  animation: globeSpin 30s linear infinite;
  opacity: 0.5;
}

@keyframes globeSpin {
  from { transform: translateY(-50%) rotate(0deg); }
  to   { transform: translateY(-50%) rotate(360deg); }
}

/* 移动端隐藏大地球，避免拥挤 */
@media (max-width: 768px) {
  .hero-globe { display: none; }
}