/* ===== sinogrand 企业官网模板 · 简约商务蓝 ===== */
:root {
  --primary: #1d4ed8;
  --primary-dark: #1e3a8a;
  --primary-light: #eef3ff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --bg: #ffffff;
  --bg-soft: #f6f9ff;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(29, 78, 216, 0.08);
  --maxw: 1160px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.75;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  font-weight: 800;
  font-size: 22px;
  letter-spacing: 0.5px;
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand .logo-dot {
  width: 30px; height: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), #3b82f6);
  display: inline-block;
}
.nav-links { display: flex; gap: 30px; align-items: center; }
.nav-links a { color: var(--text); font-weight: 500; transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: 9px 18px;
  border-radius: 999px;
  font-weight: 600;
}
.nav-cta:hover { background: var(--primary-dark); }
.menu-toggle { display: none; background: none; border: none; font-size: 26px; cursor: pointer; color: var(--text); }

/* ===== 导航右侧：语言切换 ===== */
.nav-right { display: flex; align-items: center; gap: 16px; }
.lang-toggle {
  background: #fff; border: 1px solid var(--border); color: var(--primary);
  font-weight: 700; padding: 8px 14px; border-radius: 999px; cursor: pointer; font-size: 14px;
  transition: border-color .2s, background .2s;
}
.lang-toggle:hover { border-color: var(--primary); background: var(--primary-light); }
/* 英文模式下隐藏冗余的英文副标题与英文地址行 */
html.lang-en .en-sub { display: none; }
html.lang-en .addr-en { display: none; }

/* ===== 通用区块 ===== */
.section { padding: 84px 0; }
.section-soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.section-head .eyebrow {
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 2px;
  font-size: 13px;
  text-transform: uppercase;
}
.section-head h2 { font-size: 34px; margin: 10px 0 14px; color: var(--primary-dark); }
.section-head p { color: var(--muted); font-size: 17px; }

/* ===== 首页 Hero ===== */
.hero {
  background: linear-gradient(135deg, #eef3ff 0%, #ffffff 60%);
  padding: 96px 0 88px;
  position: relative;
  overflow: hidden;
}
.hero-inner { max-width: 760px; }
.hero .badge {
  display: inline-block;
  background: #fff;
  border: 1px solid var(--border);
  color: var(--primary);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 22px;
}
.hero h1 { font-size: 46px; line-height: 1.25; color: var(--primary-dark); margin-bottom: 20px; }
.hero p.lead { font-size: 19px; color: var(--muted); margin-bottom: 34px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 16px;
  transition: transform .15s, box-shadow .2s, background .2s;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); }
.btn-ghost { background: #fff; color: var(--primary); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--primary); }

/* ===== 卡片网格 ===== */
.grid { display: grid; gap: 26px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card .en-sub { color: var(--primary); font-size: 12.5px; font-weight: 600; margin: 2px 0 10px; letter-spacing: .3px; }
.card-link { display: inline-block; margin-top: 12px; color: var(--primary); font-weight: 600; font-size: 14px; }
.card:hover .card-link { text-decoration: underline; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.card .icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 800;
  margin-bottom: 18px;
}
.card h3 { font-size: 20px; margin-bottom: 10px; color: var(--primary-dark); }
.card p { color: var(--muted); font-size: 15px; }

/* ===== 数据条 ===== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat .num { font-size: 38px; font-weight: 800; color: var(--primary); }
.stat .label { color: var(--muted); margin-top: 4px; }

/* ===== 时间线 ===== */
.timeline { max-width: 760px; margin: 0 auto; border-left: 2px solid var(--border); padding-left: 28px; }
.timeline-item { position: relative; padding-bottom: 34px; }
.timeline-item::before {
  content: ""; position: absolute; left: -36px; top: 4px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--primary); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--primary);
}
.timeline-item .year { font-weight: 700; color: var(--primary); }
.timeline-item h4 { font-size: 18px; margin: 4px 0; }
.timeline-item p { color: var(--muted); }

/* ===== 联系页 ===== */
.contact-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info h3 { font-size: 22px; color: var(--primary-dark); margin-bottom: 18px; }
.info-row { display: flex; gap: 14px; margin-bottom: 18px; }
.info-row .ic { color: var(--primary); font-weight: 800; width: 26px; }
.form input, .form textarea {
  width: 100%; padding: 13px 15px; margin-bottom: 16px;
  border: 1px solid var(--border); border-radius: 10px; font-size: 15px;
  font-family: inherit;
}
.form input:focus, .form textarea:focus { outline: none; border-color: var(--primary); }
.form textarea { min-height: 130px; resize: vertical; }
.note { font-size: 13px; color: var(--muted); margin-top: 6px; }

/* ===== 页脚 ===== */
.site-footer { background: var(--primary-dark); color: #cdd9f5; padding: 54px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; }
.site-footer h4 { color: #fff; font-size: 16px; margin-bottom: 16px; }
.site-footer a { color: #cdd9f5; display: block; margin-bottom: 9px; font-size: 14px; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.15); margin-top: 36px; padding-top: 18px; font-size: 13px; text-align: center; color: #9fb3e0; }

/* ===== 占位提示 ===== */
.ph { background: #fff7d6; border: 1px dashed #e0b400; color: #7a5b00; padding: 2px 8px; border-radius: 6px; font-size: 13px; }

/* ===== 响应式 ===== */
@media (max-width: 920px) {
  .grid-3, .grid-4, .grid-2, .stats, .contact-wrap, .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 34px; }
  .section-head h2 { font-size: 27px; }
  .nav-links {
    position: absolute; top: 68px; left: 0; right: 0;
    background: #fff; flex-direction: column; gap: 0;
    border-bottom: 1px solid var(--border); display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 14px 22px; border-bottom: 1px solid var(--border); }
  .menu-toggle { display: block; }
}


/* ===== 导航 Logo ===== */
.nav-logo { max-height: 46px; width: auto; object-fit: contain; display: block; }
@media (max-width: 920px) { .nav-logo { max-height: 38px; } }