:root {
    --brand: #e60012;
    --brand-dark: #c4000f;
    --ink: #0f172a;
    --muted: #64748b;
    --line: #e2e8f0;
    --bg: #f8fafc;
    --gap: 20px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--ink);
    background: #fff;
    line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.site-main { padding: 32px 16px 56px; min-height: 60vh; }

/* 顶栏 */
.site-header {
    background: #fff;
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    z-index: 50;
}
.header-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.logo img { height: 36px; display: block; }
.logo-text { font-size: 20px; font-weight: 800; color: var(--brand); }
.nav { display: flex; gap: 22px; flex: 1; }
.nav-item { position: relative; }
.nav-item > a { font-size: 15px; padding: 6px 0; display: inline-block; color: #1e293b; }
.nav-item > a:hover { color: var(--brand); }
.nav-sub {
    position: absolute; top: 100%; left: 0; min-width: 160px;
    background: #fff; border: 1px solid var(--line); border-radius: 8px;
    box-shadow: 0 8px 24px rgba(15,23,42,.08); padding: 8px 0; display: none;
}
.nav-item:hover .nav-sub { display: block; }
.nav-sub a { display: block; padding: 8px 16px; font-size: 14px; }
.nav-sub a:hover { background: var(--bg); color: var(--brand); }

/* Hero */
.hero { background: linear-gradient(135deg, #e60012 0%, #ff5a36 100%); color: #fff; padding: 72px 0; }
.hero h1 { font-size: 40px; margin: 0 0 12px; font-weight: 800; }
.hero-sub { font-size: 17px; opacity: .92; margin: 0 0 24px; }
.btn {
    display: inline-block; background: #fff; color: var(--brand);
    padding: 11px 28px; border-radius: 10px; font-weight: 600;
}
.btn:hover { background: #fff5f3; }

/* 区块 */
.section { margin-top: 48px; }
.section-title { font-size: 26px; margin: 0 0 20px; position: relative; padding-left: 14px; }
.section-title::before { content: ""; position: absolute; left: 0; top: 4px; bottom: 4px; width: 5px; border-radius: 3px; background: var(--brand); }

.cat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--gap); }
.cat-card {
    border: 1px solid var(--line); border-radius: 12px; padding: 20px;
    background: #fff; transition: .15s; display: block;
}
.cat-card:hover { box-shadow: 0 10px 30px rgba(230,0,18,.10); transform: translateY(-3px); border-color: #ffd2c8; }
.cat-card img { width: 56px; height: 56px; object-fit: contain; margin-bottom: 10px; }
.cat-card h3 { margin: 0 0 6px; font-size: 17px; }
.cat-card p { margin: 0; color: var(--muted); font-size: 13px; }

/* 新闻列表 */
.news-list { list-style: none; padding: 0; margin: 0; }
.news-list li { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px dashed var(--line); }
.news-list li a:hover { color: var(--brand); }
.news-list .date { color: var(--muted); font-size: 13px; white-space: nowrap; }

/* 栏目头 */
.cat-head { margin-bottom: 24px; }
.cat-head h1 { font-size: 28px; margin: 0 0 8px; }
.cat-head p { color: var(--muted); margin: 0 0 12px; }
.subcats { display: flex; flex-wrap: wrap; gap: 10px; }
.subcats a { border: 1px solid var(--line); border-radius: 999px; padding: 6px 16px; font-size: 14px; }
.subcats a:hover { border-color: var(--brand); color: var(--brand); }

/* 文档列表 */
.doc-list { display: flex; flex-direction: column; gap: 18px; }
.doc-item { display: flex; gap: 18px; border-bottom: 1px solid var(--line); padding-bottom: 18px; }
.doc-thumb { width: 200px; height: 130px; object-fit: cover; border-radius: 8px; flex: 0 0 auto; }
.doc-body { flex: 1; }
.doc-body h3 { margin: 0 0 8px; font-size: 18px; }
.doc-body h3 a:hover { color: var(--brand); }
.doc-summary { color: var(--muted); margin: 0 0 8px; font-size: 14px; }
.doc-date { color: var(--muted); font-size: 13px; }

/* 案例网格 */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap); }
.case-card { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #fff; transition: .15s; }
.case-card:hover { box-shadow: 0 10px 30px rgba(15,23,42,.10); transform: translateY(-3px); }
.case-card img { width: 100%; height: 180px; object-fit: cover; display: block; }
.case-card h3 { margin: 12px 14px 10px; font-size: 16px; }

/* 详情 */
.detail-title { font-size: 30px; margin: 0 0 12px; }
.detail-meta { color: var(--muted); font-size: 14px; margin-bottom: 18px; display: flex; gap: 16px; flex-wrap: wrap; }
.detail-conpic { margin-bottom: 18px; }
.detail-conpic img { max-width: 100%; border-radius: 10px; }
.detail-content { font-size: 16px; }
.detail-content img { max-width: 100%; height: auto; border-radius: 8px; }
.detail-back { margin-top: 24px; }
.detail-back a { color: var(--brand); }

.page-content { font-size: 16px; }

/* 分页 */
.pagination { display: flex; gap: 8px; margin-top: 28px; flex-wrap: wrap; }
.pagination a, .pagination span {
    min-width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center;
    border: 1px solid var(--line); border-radius: 8px; font-size: 14px; padding: 0 8px;
}
.pagination a:hover { border-color: var(--brand); color: var(--brand); }
.pagination .cur { background: var(--brand); color: #fff; border-color: var(--brand); }

/* 搜索 */
.search-form { display: flex; gap: 10px; margin-bottom: 20px; }
.search-form input { flex: 1; max-width: 420px; padding: 10px 14px; border: 1px solid var(--line); border-radius: 8px; }
.search-form button { background: var(--brand); color: #fff; border: 0; padding: 10px 24px; border-radius: 8px; cursor: pointer; }
.search-count { color: var(--muted); }

/* 表单 */
.form-block { border: 1px solid var(--line); border-radius: 12px; padding: 24px; margin-bottom: 24px; max-width: 640px; }
.form-block h2 { margin: 0 0 16px; font-size: 20px; }
.form-row { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.form-row span { font-size: 14px; color: #334155; }
.form-row input { padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; }
.captcha-row { flex-direction: row; align-items: center; gap: 10px; }
.captcha-img { height: 40px; cursor: pointer; border: 1px solid var(--line); border-radius: 6px; }
.js-ajax-form button { background: var(--brand); color: #fff; border: 0; padding: 10px 24px; border-radius: 8px; cursor: pointer; }
.form-msg { margin-left: 12px; color: var(--brand); font-size: 14px; }

/* 页脚 */
.site-footer { background: #0f172a; color: #cbd5e1; padding: 40px 0 28px; margin-top: 48px; }
.footer-inner { display: flex; gap: 40px; flex-wrap: wrap; }
.footer-cols { display: flex; gap: 40px; flex-wrap: wrap; flex: 1; }
.fcol h4 { color: #fff; font-size: 15px; margin: 0 0 12px; }
.fcol a { display: block; color: #94a3b8; font-size: 14px; padding: 4px 0; }
.fcol a:hover { color: #fff; }
.footer-meta { font-size: 13px; color: #94a3b8; }
.footer-meta p { margin: 4px 0; }
.footer-meta a { color: #94a3b8; }

/* 响应式 */
@media (max-width: 900px) {
    .cat-grid { grid-template-columns: repeat(2, 1fr); }
    .case-grid { grid-template-columns: repeat(2, 1fr); }
    .nav { gap: 14px; overflow-x: auto; }
}
@media (max-width: 600px) {
    .cat-grid, .case-grid { grid-template-columns: 1fr; }
    .doc-item { flex-direction: column; }
    .doc-thumb { width: 100%; height: 180px; }
    .hero h1 { font-size: 30px; }
}