/* ===== 上海儒赛电子技术有限公司 官网公共样式 ===== */
:root {
  --primary: #1c5496;
  --primary-dark: #154074;
  --primary-light: #e8f0fa;
  --accent: #2d7dd2;
  --text: #1f2937;
  --text-light: #64748b;
  --bg: #ffffff;
  --bg-soft: #f4f6f8;
  --border: #d7dde7;
  --shadow: 0 4px 16px rgba(15, 23, 42, .08);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, .14);
  --maxw: 1200px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }

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

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 页头 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 6px rgba(15, 23, 42, .05);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 38px; width: 38px; flex: 0 0 auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand .brand-name {
  font-size: 19px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: .5px;
}
.brand .brand-tagline {
  font-size: 11px;
  color: var(--text-light);
  letter-spacing: 2px;
  margin-top: 1px;
}
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 16px;
  font-size: 15px;
  color: var(--text);
  border-radius: 6px;
  transition: all .2s;
}
.main-nav a:hover { background: var(--primary-light); color: var(--primary); }
.main-nav a.active { color: #fff; background: var(--primary); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: .3s;
}

/* ===== 通用区块 ===== */
.section { padding: 64px 0; }
.section.soft { background: var(--bg-soft); }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head h2 {
  font-size: 30px;
  color: var(--text);
  font-weight: 700;
  position: relative;
  display: inline-block;
  padding-bottom: 14px;
}
.section-head h2::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 0;
  transform: translateX(-50%);
  width: 56px; height: 3px;
  background: var(--primary);
  border-radius: 2px;
}
.section-head p {
  margin-top: 14px;
  color: var(--text-light);
  font-size: 15px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-block;
  padding: 12px 30px;
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
}
.btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }
.btn.outline { background: transparent; color: var(--primary); }
.btn.outline:hover { background: var(--primary); color: #fff; }

/* ===== 页脚 ===== */
.site-footer {
  background: #1a2733;
  color: #c7d2dc;
  padding: 48px 0 20px;
  margin-top: auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer-col h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 16px;
}
.footer-col p, .footer-col li { font-size: 14px; line-height: 2; color: #b6c2ce; }
.footer-col ul { list-style: none; }
.footer-col a { color: #b6c2ce; }
.footer-col a:hover { color: #fff; }
.footer-brand { font-size: 17px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.footer-bottom {
  padding-top: 18px;
  text-align: center;
  font-size: 13px;
  color: #8a98a6;
}
.footer-bottom a { color: #8a98a6; }
.footer-bottom a:hover { color: #c7d2dc; }
.footer-bottom .icp { margin-left: 8px; }
.footer-bottom .beian-ga { margin-left: 8px; display: inline-flex; align-items: center; }
.footer-bottom .ga-icon { width: 14px; height: 14px; flex: none; display: inline-block; vertical-align: middle; margin-right: 4px; }

/* ===== 卡片网格 ===== */
.grid {
  display: grid;
  gap: 28px;
}
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: all .25s;
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--primary);
}
.card-body { padding: 22px; }
.card-body h3 { font-size: 18px; margin-bottom: 10px; color: var(--text); }
.card-body p { font-size: 14px; color: var(--text-light); }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .main-nav {
    position: fixed;
    top: 68px; right: 0;
    flex-direction: column;
    align-items: stretch;
    width: 220px;
    background: #fff;
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 12px;
    gap: 2px;
    transform: translateX(100%);
    transition: transform .25s;
    box-shadow: var(--shadow);
  }
  .main-nav.open { transform: translateX(0); }
  .main-nav a { padding: 12px 16px; }
  .nav-toggle { display: flex; }
  .brand img { height: 32px; width: 32px; }
  .brand .brand-name { font-size: 16px; }
  .brand .brand-tagline { font-size: 10px; letter-spacing: 1px; }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .section { padding: 44px 0; }
  .section-head h2 { font-size: 24px; }
}