/* ===== 基础重置与变量 ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #0a2463;
  --accent: #1e88e5;
  --accent-light: #e3f2fd;
  --text: #333;
  --text-light: #666;
  --bg: #fff;
  --bg-alt: #f5f7fa;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,.08);
  --transition: .3s ease;
}

html { scroll-behavior: smooth; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif; color: var(--text); line-height: 1.7; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,.95); backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0,0,0,.06); transition: var(--transition);
}
.nav-content { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.3rem; font-weight: 700; color: var(--primary); }
.logo-img { height: 40px; width: auto; }
.nav-links { display: flex; list-style: none; gap: 28px; }
.nav-links a { font-size: .95rem; color: var(--text); transition: var(--transition); position: relative; }
.nav-links a:hover { color: var(--accent); }
.nav-links a::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px; background: var(--accent); transition: var(--transition); }
.nav-links a:hover::after { width: 100%; }
.nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--primary); }

/* ===== Hero ===== */
.hero {
  position: relative; height: 100vh; min-height: 600px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; background: var(--primary);
}
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(10,36,99,.85), rgba(30,136,229,.6)); }
.hero-content { position: relative; text-align: center; color: #fff; padding: 20px; max-width: 800px; }
.hero-sub { font-size: .95rem; letter-spacing: 4px; opacity: .7; margin-bottom: 12px; text-transform: uppercase; }
.hero-content h1 { font-size: clamp(2rem, 5vw, 3.5rem); margin-bottom: 12px; letter-spacing: 2px; }
.hero-desc { font-size: clamp(1rem, 2.5vw, 1.4rem); opacity: .9; margin-bottom: 16px; }
.hero-slogan { font-size: .95rem; opacity: .7; margin-bottom: 36px; line-height: 1.8; }
.hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 14px 36px; background: var(--accent);
  color: #fff; border-radius: 50px; font-size: 1rem; transition: var(--transition);
}
.btn:hover { background: #1565c0; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(30,136,229,.4); }
.btn-outline { background: transparent; border: 2px solid rgba(255,255,255,.6); }
.btn-outline:hover { background: rgba(255,255,255,.15); border-color: #fff; box-shadow: none; }

/* ===== 数据亮点 ===== */
.stats-bar { background: var(--primary); padding: 40px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; color: #fff; }
.stats-num { font-size: 2.2rem; font-weight: 700; color: var(--accent); }
.stats-unit { font-size: 1rem; color: var(--accent); }
.stats-item p { font-size: .9rem; opacity: .7; margin-top: 4px; }

/* ===== 通用 Section ===== */
.section { padding: 90px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  text-align: center; font-size: 2rem; color: var(--primary);
  margin-bottom: 16px; position: relative;
}
.section-title::after {
  content: ''; display: block; width: 60px; height: 3px;
  background: var(--accent); margin: 12px auto 0;
}
.section-desc { text-align: center; color: var(--text-light); max-width: 700px; margin: 0 auto 50px; font-size: .95rem; }

/* ===== 关于我们 ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-img img { border-radius: var(--radius); box-shadow: var(--shadow); }
.about-text h3 { font-size: 1.5rem; color: var(--primary); margin-bottom: 4px; }
.about-en { font-size: .85rem; color: var(--text-light); margin-bottom: 16px; letter-spacing: 1px; }
.about-text p { color: var(--text-light); margin-bottom: 14px; }
.about-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0; }
.tag { background: var(--accent-light); color: var(--accent); padding: 4px 14px; border-radius: 20px; font-size: .8rem; }
.about-stats { display: flex; gap: 30px; margin-top: 20px; }
.stat { text-align: center; }
.stat strong { display: block; font-size: 1.3rem; color: var(--accent); }
.stat span { font-size: .85rem; color: var(--text-light); }

/* ===== 核心业务 ===== */
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.product-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition);
}
.product-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,0,0,.12); }
.product-card img { width: 100%; height: 200px; object-fit: cover; }
.product-body { padding: 20px; }
.product-body h3 { font-size: 1.1rem; color: var(--primary); margin-bottom: 8px; }
.product-body p { font-size: .9rem; color: var(--text-light); line-height: 1.7; }

/* ===== 发展历程 ===== */
.timeline { position: relative; max-width: 700px; margin: 0 auto; padding-left: 40px; }
.timeline::before { content: ''; position: absolute; left: 14px; top: 0; bottom: 0; width: 3px; background: linear-gradient(to bottom, var(--accent), var(--primary)); border-radius: 2px; }
.timeline-item { position: relative; margin-bottom: 40px; }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute; left: -33px; top: 4px; width: 16px; height: 16px;
  background: var(--accent); border: 3px solid #fff; border-radius: 50%;
  box-shadow: 0 0 0 3px var(--accent);
}
.timeline-content {
  background: var(--bg-alt); padding: 24px; border-radius: var(--radius);
  box-shadow: var(--shadow); transition: var(--transition);
}
.timeline-content:hover { transform: translateX(6px); }
.timeline-content h3 { color: var(--primary); margin-bottom: 8px; font-size: 1.1rem; }
.timeline-content p { color: var(--text-light); font-size: .9rem; }

/* ===== 企业优势 ===== */
.advantages-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.advantage-card {
  text-align: center; padding: 40px 24px; background: #fff;
  border-radius: var(--radius); transition: var(--transition); box-shadow: var(--shadow);
}
.advantage-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,.1); }
.advantage-icon { font-size: 2.5rem; margin-bottom: 16px; }
.advantage-card h3 { color: var(--primary); margin-bottom: 10px; }
.advantage-card p { font-size: .9rem; color: var(--text-light); }

/* ===== 企业风采 ===== */
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.gallery-item { position: relative; overflow: hidden; border-radius: var(--radius); }
.gallery-item img { width: 100%; height: 240px; object-fit: cover; transition: var(--transition); }
.gallery-item:hover img { transform: scale(1.05); }
.gallery-label {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,.7)); color: #fff;
  padding: 30px 16px 12px; font-size: .9rem;
}

/* ===== 合作伙伴 ===== */
.partners-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 24px; align-items: center; }
.partner-item {
  background: #fff; padding: 20px; border-radius: var(--radius);
  box-shadow: var(--shadow); display: flex; align-items: center; justify-content: center;
  height: 90px; transition: var(--transition); font-size: 1rem; font-weight: 600; color: var(--primary);
}
.partner-item:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,0,0,.1); color: var(--accent); }

/* ===== 联系我们 ===== */
.contact-cards { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.contact-card {
  text-align: center; padding: 32px 20px; background: var(--bg-alt);
  border-radius: var(--radius); transition: var(--transition);
}
.contact-card:hover { background: #fff; box-shadow: var(--shadow); transform: translateY(-4px); }
.contact-icon { font-size: 2rem; margin-bottom: 12px; }
.contact-card strong { display: block; color: var(--primary); margin-bottom: 6px; }
.contact-card p { color: var(--text-light); font-size: .9rem; }
.contact-card a { color: var(--accent); transition: var(--transition); }
.contact-card a:hover { text-decoration: underline; }

/* ===== 页脚 ===== */
.footer { background: var(--primary); color: rgba(255,255,255,.8); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-logo { height: 36px; margin-bottom: 12px; }
.footer-col h4 { color: #fff; margin-bottom: 16px; }
.footer-col a { display: block; margin-bottom: 8px; font-size: .9rem; transition: var(--transition); }
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-col p { font-size: .9rem; margin-bottom: 6px; }
.footer-link a { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.15); padding: 20px 0; text-align: center; font-size: .85rem; }

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .about-grid { grid-template-columns: 1fr; }
  .products-grid, .advantages-grid, .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; flex-direction: column; position: absolute;
    top: 70px; left: 0; right: 0; background: #fff;
    padding: 20px; gap: 16px; box-shadow: var(--shadow);
  }
  .nav-links.active { display: flex; }
  .nav-toggle { display: block; }
  .products-grid, .advantages-grid { grid-template-columns: 1fr; }
  .contact-cards { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .about-stats { flex-direction: column; gap: 16px; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; align-items: center; }
}