/* 吉林省通利特种电线电缆制造有限公司 - 全局样式 */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #1a5276;
  --primary-dark: #154360;
  --accent: #e74c3c;
  --text: #333;
  --text-light: #666;
  --bg: #f8f9fa;
  --white: #fff;
  --shadow: 0 2px 15px rgba(0,0,0,0.08);
  --transition: all 0.3s ease;
}
html { scroll-behavior: smooth; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 顶部信息栏 */
.top-bar {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.9);
  font-size: 13px;
  padding: 8px 0;
}
.top-bar .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
.top-bar span { margin-right: 20px; }
.top-bar i { margin-right: 5px; color: #f0c040; }

/* 导航栏 */
.header {
  background: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header .container { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon {
  width: 45px; height: 45px; background: var(--primary);
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 20px; font-weight: bold;
}
.logo-text h1 { font-size: 20px; color: var(--primary); letter-spacing: 1px; }
.logo-text p { font-size: 12px; color: var(--text-light); }
.nav { display: flex; gap: 5px; }
.nav a {
  padding: 8px 18px; font-size: 15px; color: var(--text);
  border-radius: 4px; transition: var(--transition); position: relative;
}
.nav a:hover, .nav a.active { color: var(--primary); background: rgba(26,82,118,0.08); }
.nav a.active::after {
  content: ''; position: absolute; bottom: 0; left: 20%; width: 60%; height: 2px;
  background: var(--primary); border-radius: 2px;
}
.mobile-menu-btn { display: none; font-size: 24px; cursor: pointer; color: var(--primary); }

/* 页脚 */
.footer {
  background: #1a2332; color: rgba(255,255,255,0.7); padding: 50px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 40px; }
.footer-brand h3 { color: #fff; font-size: 20px; margin-bottom: 15px; }
.footer-brand p { font-size: 14px; line-height: 1.8; margin-bottom: 15px; }
.footer-links h4 { color: #fff; font-size: 16px; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: rgba(255,255,255,0.7); font-size: 14px; transition: var(--transition); }
.footer-links a:hover { color: #f0c040; padding-left: 5px; }
.footer-contact p { font-size: 14px; margin-bottom: 12px; display: flex; align-items: flex-start; gap: 10px; }
.footer-contact i { color: #f0c040; margin-top: 3px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding: 20px 0;
  text-align: center; font-size: 13px; color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.6); }

/* 通用板块标题 */
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 32px; color: var(--primary); margin-bottom: 10px; position: relative; display: inline-block; }
.section-title h2::after {
  content: ''; position: absolute; bottom: -8px; left: 50%; transform: translateX(-50%);
  width: 50px; height: 3px; background: var(--accent); border-radius: 2px;
}
.section-title p { color: var(--text-light); font-size: 15px; margin-top: 20px; }

/* 按钮 */
.btn {
  display: inline-block; padding: 12px 30px; border-radius: 4px;
  font-size: 15px; transition: var(--transition); cursor: pointer; border: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 5px 20px rgba(26,82,118,0.3); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

/* 面包屑 */
.breadcrumb { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); padding: 60px 0; text-align: center; color: #fff; }
.breadcrumb h1 { font-size: 36px; margin-bottom: 15px; }
.breadcrumb span { font-size: 14px; opacity: 0.9; }
.breadcrumb span a { color: rgba(255,255,255,0.8); }
.breadcrumb span a:hover { color: #fff; text-decoration: underline; }

/* 内容区 */
.content-section { padding: 60px 0; }

/* 懒加载占位 */
.lazy-img { background: #e9ecef; min-height: 200px; }

/* 响应式 */
@media (max-width: 992px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav { display: none; position: absolute; top: 70px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 20px; box-shadow: var(--shadow); }
  .nav.active { display: flex; }
  .mobile-menu-btn { display: block; }
  .header .container { position: relative; }
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .section-title h2 { font-size: 24px; }
  .breadcrumb h1 { font-size: 28px; }
  .top-bar .container { justify-content: center; text-align: center; }
}