/* 帆豆科技线束官网 - 自然商务风格 */
:root {
  --navy: #1a365d;
  --navy-2: #2b6cb0;
  --teal: #2c7a7b;
  --ink: #2d3748;
  --body: #4a5568;
  --line: #e2e8f0;
  --bg: #f7fafc;
  --card: #ffffff;
  --accent: #dd6b20;
  --accent-deep: #c05621;
  --ok: #2f855a;
  --err: #c53030;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.05), 0 4px 12px rgba(0,0,0,.05);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.6; font-size: 15px;
}
img { max-width: 100%; height: auto; }
a { color: var(--navy-2); text-decoration: none; }
a:hover { color: var(--navy); }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 760px; }

/* 页头 */
.site-header {
  background: #fff; color: var(--ink); position: sticky; top: 0; z-index: 50;
  box-shadow: 0 1px 3px rgba(0,0,0,.08); border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  min-height: 64px; flex-wrap: wrap; padding: 12px 0;
}
.brand {
  color: var(--navy); font-size: 20px; font-weight: 700; letter-spacing: .5px;
}
.brand:hover { color: var(--navy-2); }
.site-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  color: var(--body); padding: 8px 14px; border-radius: 6px; font-size: 15px;
  transition: all .2s;
}
.site-nav a:hover { background: var(--bg); color: var(--navy); }
.site-nav a.active { color: var(--accent-deep); font-weight: 600; background: #fff5eb; }

.header-right { display: flex; align-items: center; gap: 12px; }
.lang-switch select {
  background: #fff; color: var(--ink); border: 1px solid var(--line);
  border-radius: 6px; padding: 6px 10px; font-size: 13px; cursor: pointer;
}

/* 按钮 */
.btn {
  display: inline-block; border-radius: 6px; padding: 10px 24px; font-size: 15px;
  font-weight: 500; border: 1px solid transparent; cursor: pointer; transition: all .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--accent); color: #fff; box-shadow: 0 2px 8px rgba(221,107,32,.3);
}
.btn-primary:hover { background: var(--accent-deep); color: #fff; }
.btn-ghost { background: transparent; color: var(--navy-2); border-color: var(--navy-2); }
.btn-sm { padding: 6px 16px; font-size: 14px; }
.btn-block { width: 100%; text-align: center; }

/* Hero 区域 */
.home-hero {
  background: linear-gradient(135deg, #1a365d 0%, #2b6cb0 100%);
  color: #fff; padding: 80px 0; text-align: center;
}
.home-hero h1 { font-size: 38px; margin: 0 0 16px; font-weight: 700; }
.home-hero p { font-size: 18px; color: rgba(255,255,255,.9); max-width: 700px; margin: 0 auto 32px; line-height: 1.7; }
.home-hero .btn-ghost { color: #fff; border-color: rgba(255,255,255,.5); }
.home-hero .btn-ghost:hover { background: rgba(255,255,255,.1); border-color: #fff; }

/* 区块 */
.section { padding: 64px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 30px; margin: 0 0 12px; color: var(--navy); font-weight: 700; }
.section-title p { color: var(--body); font-size: 16px; max-width: 600px; margin: 0 auto; }

/* 卡片网格 */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: block; color: inherit; transition: all .2s; height: 100%;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 24px rgba(0,0,0,.08); text-decoration: none; border-color: var(--navy-2); }
.card .thumb { aspect-ratio: 4 / 3; background: #f7fafc; overflow: hidden; }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .3s; }
.card:hover .thumb img { transform: scale(1.05); }
.card .body { padding: 20px; }
.card .cat {
  display: inline-block; font-size: 12px; color: var(--accent-deep); background: #fff5eb;
  padding: 3px 10px; border-radius: 4px; margin-bottom: 10px;
}
.card h3 { font-size: 18px; margin: 0 0 8px; color: var(--navy); line-height: 1.4; font-weight: 600; }
.card p { color: var(--body); font-size: 14px; margin: 0 0 12px; line-height: 1.6; }
.card .more { color: var(--accent-deep); font-size: 14px; font-weight: 500; }

/* 筛选栏 */
.filter-bar { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 32px; }
.filter-bar a {
  padding: 8px 16px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--card); color: var(--body); font-size: 14px; transition: all .2s;
}
.filter-bar a:hover { border-color: var(--navy-2); color: var(--navy); }
.filter-bar a.active { background: var(--navy); color: #fff; border-color: var(--navy); }

/* 分页 */
.pagination {
  display: flex; justify-content: center; align-items: center; gap: 16px;
  margin: 48px 0; padding: 24px 0;
}
.page-btn {
  padding: 8px 20px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--card); color: var(--navy-2); font-size: 14px; transition: all .2s;
}
.page-btn:hover { border-color: var(--navy-2); background: var(--bg); }
.page-info { color: var(--body); font-size: 14px; }

/* 页脚 */
.site-footer { background: #1a202c; color: #e2e8f0; margin-top: 64px; }
.footer-inner {
  display: grid; grid-template-columns: 2fr 1fr 1.5fr 1fr; gap: 40px;
  padding: 64px 0 48px;
}
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 16px; font-weight: 600; }
.footer-col p { color: #a0aec0; font-size: 14px; line-height: 1.7; margin-bottom: 8px; }
.footer-nav { display: flex; flex-direction: column; gap: 8px; }
.footer-nav a { color: #a0aec0; font-size: 14px; transition: color .2s; }
.footer-nav a:hover { color: #fff; }
.contact-info p { margin-bottom: 10px; }
.qr-codes { display: flex; gap: 16px; }
.qr-item { text-align: center; }
.qr-item img {
  width: 100px; height: 100px; border-radius: 8px; border: 2px solid #2d3748;
}
.qr-item p { margin-top: 8px; font-size: 12px; color: #a0aec0; }
.footer-bottom { border-top: 1px solid #2d3748; padding: 20px 0; }
.footer-bottom .wrap { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-bottom p { color: #718096; font-size: 13px; }
.footer-nav-bottom { display: flex; gap: 20px; }
.footer-nav-bottom a { color: #718096; font-size: 13px; }
.footer-nav-bottom a:hover { color: #e2e8f0; }

/* 表单 */
.lead-form .form-row { margin-bottom: 20px; }
.lead-form label { display: block; margin-bottom: 6px; font-weight: 500; color: var(--ink); }
.lead-form input, .lead-form textarea {
  width: 100%; padding: 12px 16px; border: 1px solid var(--line); border-radius: 6px;
  font-size: 15px; transition: border-color .2s;
}
.lead-form input:focus, .lead-form textarea:focus {
  outline: none; border-color: var(--navy-2); box-shadow: 0 0 0 3px rgba(43,108,176,.1);
}
.form-success { background: #f0fff4; color: var(--ok); padding: 16px; border-radius: 6px; margin-bottom: 20px; border: 1px solid #c6f6d5; }
.form-error { background: #fff5f5; color: var(--err); padding: 16px; border-radius: 6px; margin-bottom: 20px; border: 1px solid #feb2b2; }

/* 面包屑 */
.breadcrumb { font-size: 13px; color: var(--body); margin: 24px 0; }
.breadcrumb a { color: var(--navy-2); }
.breadcrumb .bc-current { color: var(--ink); font-weight: 500; }
.breadcrumb .bc-sep { margin: 0 8px; color: #cbd5e0; }

/* 产品详情页 */
.product-detail .detail-content { line-height: 1.8; color: var(--body); }
.product-detail h3 { color: var(--navy); margin: 24px 0 12px; font-size: 20px; }
.product-detail ul { padding-left: 24px; margin: 12px 0; }
.product-detail li { margin-bottom: 8px; }

/* 统计卡片 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-card { text-align: center; padding: 32px; background: var(--card); border-radius: var(--radius); border: 1px solid var(--line); }
.stat-card .num { font-size: 36px; font-weight: 700; color: var(--accent); margin-bottom: 8px; }
.stat-card .label { color: var(--body); font-size: 14px; }

/* 响应式 */
@media (max-width: 768px) {
  .header-inner { flex-direction: column; gap: 12px; }
  .site-nav { justify-content: center; }
  .home-hero { padding: 48px 0; }
  .home-hero h1 { font-size: 28px; }
  .home-hero p { font-size: 16px; }
  .section { padding: 48px 0; }
  .section-title { margin-bottom: 32px; }
  .section-title h2 { font-size: 24px; }
  .grid-3 { grid-template-columns: 1fr; gap: 16px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; padding: 48px 0 32px; }
  .footer-bottom .wrap { flex-direction: column; text-align: center; }
  .pagination { flex-direction: column; gap: 12px; }
}