/* 湘军商务调查 全站样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #1a2c42;
  --primary-dark: #0f1b2b;
  --accent: #c81623;
  --accent-dark: #a5121e;
  --bg: #f5f7fa;
  --text: #2c3e50;
  --muted: #6b7a8f;
  --border: #e4e9f0;
}
body {
  font-family: "Microsoft YaHei", "PingFang SC", -apple-system, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: #fff;
  font-size: 15px;
}
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }
img { max-width: 100%; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 顶部细条 */
.topbar { background: var(--primary-dark); color: #c8d3e0; font-size: 13px; padding: 8px 0; }
.topbar .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.topbar a { color: #fff; }

/* 主导航 */
.header { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 8px rgba(0,0,0,.04); }
.nav { display: flex; justify-content: space-between; align-items: center; height: 76px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark { width: 44px; height: 48px; background: var(--primary); display: flex; align-items: center; justify-content: center; clip-path: polygon(50% 0%, 100% 18%, 100% 58%, 50% 100%, 0% 58%, 0% 18%); }
.logo-text { font-size: 22px; font-weight: 700; color: var(--primary); }
.logo-text span { color: var(--accent); }
.nav-menu { display: flex; list-style: none; gap: 28px; }
.nav-menu a { color: var(--text); font-size: 15px; font-weight: 500; padding: 8px 2px; border-bottom: 2px solid transparent; }
.nav-menu a:hover, .nav-menu a.active { color: var(--accent); border-bottom-color: var(--accent); }
.nav-phone { text-align: right; }
.nav-phone small { display: block; color: var(--muted); font-size: 12px; }
.nav-phone strong { color: var(--accent); font-size: 20px; font-weight: 700; }

/* Banner */
.banner { background: linear-gradient(135deg, var(--primary) 0%, #2d4a6f 100%); color: #fff; padding: 90px 0; position: relative; overflow: hidden; }
.banner::after { content: ""; position: absolute; right: -100px; top: -100px; width: 400px; height: 400px; background: rgba(255,255,255,.04); border-radius: 50%; }
.banner h1, .banner-title { font-size: 40px; margin-bottom: 18px; line-height: 1.3; }
.banner p { font-size: 17px; opacity: .92; max-width: 760px; margin-bottom: 30px; }
.btn { display: inline-block; padding: 13px 36px; background: var(--accent); color: #fff !important; border-radius: 4px; font-weight: 600; font-size: 15px; transition: background .2s; }
.btn:hover { background: var(--accent-dark); }
.btn.ghost { background: transparent; border: 1px solid rgba(255,255,255,.5); margin-left: 10px; }
.btn.ghost:hover { background: rgba(255,255,255,.1); }

/* 通用区块 */
.section { padding: 70px 0; }
.section.alt { background: var(--bg); }
.section-title { text-align: center; margin-bottom: 45px; }
.section-title h2 { font-size: 30px; color: var(--primary); margin-bottom: 10px; }
.section-title p { color: var(--muted); font-size: 15px; }
.breadcrumb { font-size: 13px; color: var(--muted); padding: 15px 0; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }

/* 卡片网格 */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 25px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 30px; transition: all .25s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(26,44,66,.1); border-color: var(--primary); }
.card .icon { width: 48px; height: 48px; background: #eef2f7; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 18px; color: var(--primary); font-weight: 700; }
.card h3 { font-size: 18px; color: var(--primary); margin-bottom: 12px; }
.card p { color: var(--muted); font-size: 14px; margin-bottom: 15px; }
.card .more { color: var(--accent); font-weight: 600; font-size: 14px; }

/* 优势 */
.adv-item { text-align: center; padding: 20px 10px; }
.adv-item .num { font-size: 36px; font-weight: 800; color: var(--primary); line-height: 1; margin-bottom: 10px; }
.adv-item h4 { font-size: 17px; color: var(--primary); margin-bottom: 8px; }
.adv-item p { font-size: 13px; color: var(--muted); }

/* 案例 */
.case-card { background: #fff; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.case-cover { height: 180px; background: linear-gradient(135deg, var(--primary), #3a5a82); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 600; letter-spacing: 2px; }
.case-body { padding: 20px; }
.case-body h4 { font-size: 16px; color: var(--primary); margin-bottom: 8px; }
.case-body p { font-size: 13px; color: var(--muted); }
.tag { display: inline-block; background: #eef2f7; color: var(--primary); padding: 2px 10px; border-radius: 3px; font-size: 12px; margin-right: 6px; margin-bottom: 8px; }

/* FAQ */
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 12px; }
.faq-q { padding: 16px 20px; font-weight: 600; color: var(--primary); cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-q::after { content: "+"; font-size: 20px; color: var(--accent); }
.faq-a { padding: 0 20px 16px; color: var(--muted); font-size: 14px; display: none; }
.faq-item.open .faq-a { display: block; }
.faq-item.open .faq-q::after { content: "−"; }

/* 联系区 */
.contact-band { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); color: #fff; padding: 60px 0; }
.contact-band h2 { font-size: 28px; margin-bottom: 15px; }
.contact-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-top: 25px; }
.contact-grid p { margin-bottom: 10px; font-size: 14px; color: #d8e0ec; }
.contact-grid strong { color: #fff; }
.contact-phone-big { font-size: 28px; font-weight: 800; color: #ff6b6b; margin: 10px 0; }

/* 正文页 */
.page-body { padding: 50px 0; }
.page-body h1 { font-size: 28px; color: var(--primary); margin-bottom: 20px; padding-bottom: 15px; border-bottom: 2px solid var(--border); }
.page-body h2 { font-size: 21px; color: var(--primary); margin: 28px 0 12px; padding-left: 12px; border-left: 4px solid var(--accent); }
.page-body p { margin-bottom: 14px; color: var(--text); font-size: 15px; }
.page-body ul { margin: 0 0 16px 22px; }
.page-body li { margin-bottom: 8px; }
.notice { background: #fff8e6; border-left: 4px solid #f0a020; padding: 14px 18px; border-radius: 4px; margin: 18px 0; font-size: 14px; color: #7a5a10; }

/* 列表页 */
.news-list .news-item { padding: 22px 0; border-bottom: 1px solid var(--border); }
.news-list .news-item h3 { font-size: 18px; margin-bottom: 8px; }
.news-list .news-item .meta { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.news-list .news-item p { font-size: 14px; color: var(--muted); }

/* 页脚 */
.footer { background: var(--primary-dark); color: #8a9bb3; padding: 20px 0; font-size: 13px; text-align: center; }
.footer a { color: #8a9bb3; }

/* 侧边浮动电话 */
.side-call { position: fixed; right: 20px; bottom: 80px; background: var(--accent); color: #fff; padding: 12px 18px; border-radius: 30px; font-weight: 700; box-shadow: 0 4px 15px rgba(200,22,35,.4); z-index: 99; }
.side-call:hover { color: #fff; }

/* 响应式 */
@media (max-width: 900px) {
  .nav { flex-direction: column; height: auto; padding: 12px 0; gap: 10px; }
  .nav-menu { flex-wrap: wrap; justify-content: center; gap: 14px; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 20px; }
  .banner h1 { font-size: 28px; }
  .banner { padding: 50px 0; }
}
@media (max-width: 600px) {
  body { font-size: 15px; }
  /* 手机端保持双列，紧凑排布 */
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  /* 奇数个卡片时最后一个自动占满整行，避免落单 */
  .grid-3 > *:nth-child(odd):last-child,
  .grid-4 > *:nth-child(odd):last-child { grid-column: 1 / -1; }
  .card { padding: 16px; }
  .card h3 { font-size: 15px; }
  .card p { font-size: 13px; line-height: 1.6; }
  .card .more { display: inline-block; padding: 6px 0; min-height: 32px; }
  .card .icon { width: 36px; height: 36px; font-size: 17px; margin-bottom: 12px; }
  .case-cover { height: 120px; font-size: 15px; }
  .case-body { padding: 14px; }
  .case-body h4 { font-size: 14px; }
  .case-body p { font-size: 13px; }
  .adv-item .num { font-size: 28px; }
  .topbar .container { justify-content: center; font-size: 12px; }
  .nav-menu a { padding: 10px 4px; min-height: 44px; display: inline-flex; align-items: center; }
  .btn { padding: 12px 24px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
  .side-call { padding: 10px 14px; font-size: 13px; right: 12px; bottom: 60px; min-height: 44px; display: inline-flex; align-items: center; }
  .faq-q { padding: 16px 14px; min-height: 44px; }
  .breadcrumb { font-size: 12px; padding: 10px 0; }
  .page-body h1 { font-size: 22px; }
  .page-body h2 { font-size: 18px; }
  .page-body p, .page-body li { font-size: 14px; }
  input, textarea, select { font-size: 16px !important; }
}