:root{
  --grad-a:#1e3a8a; --grad-b:#5b21b6; --grad-c:#0e7490; --grad-d:#3b82f6;
  --bg:#f6f7fb; --card:#ffffff; --ink:#1f2937; --sub:#6b7280;
  --line:#e5e7eb; --accent:#2563eb; --warm:#f59e0b;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--grad-b)}
img{max-width:100%;height:auto;display:block;border-radius:10px}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
/* 顶栏 */
.topbar{background:linear-gradient(135deg,var(--grad-a),var(--grad-b) 55%,var(--grad-c));color:#fff;padding:14px 0;box-shadow:0 2px 12px rgba(30,58,138,.25)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;color:#fff;font-weight:800;font-size:22px}
.brand .logo{width:42px;height:42px;border-radius:10px;background:linear-gradient(135deg,#fff,#dbeafe);display:flex;align-items:center;justify-content:center;font-size:24px}
.brand small{display:block;font-size:12px;font-weight:500;opacity:.85}
.nav{display:flex;gap:6px;flex-wrap:wrap}
.nav a{color:#fff;padding:7px 14px;border-radius:999px;font-size:14px;background:rgba(255,255,255,.12);transition:.2s}
.nav a:hover{background:rgba(255,255,255,.28);color:#fff}
/* Hero */
.hero{background:linear-gradient(120deg,var(--grad-a) 0%,var(--grad-b) 45%,var(--grad-c) 100%);color:#fff;padding:60px 0 70px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;background:rgba(255,255,255,.08)}
.hero h1{font-size:40px;font-weight:900;letter-spacing:-1px;line-height:1.25}
.hero p.lead{font-size:18px;opacity:.92;max-width:720px;margin:16px 0 26px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}
.hero .cta a{padding:12px 26px;border-radius:12px;font-weight:700;font-size:15px}
.btn-solid{background:#fff;color:var(--grad-b)!important}
.btn-ghost{background:rgba(255,255,255,.14);color:#fff!important;border:1px solid rgba(255,255,255,.4)}
/* 区块 */
section.block{padding:46px 0}
.sec-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;flex-wrap:wrap;gap:10px}
.sec-head h2{font-size:26px;font-weight:800}
.sec-head .sub{color:var(--sub);font-size:14px}
.more{font-size:14px;font-weight:600}
/* 卡片 */
.grid{display:grid;gap:20px}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;transition:.25s;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 28px rgba(30,58,138,.12);border-color:#c7d2fe}
.card .emoji{font-size:34px;display:block;margin-bottom:10px}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--sub);font-size:14px}
.card a.link{display:inline-block;margin-top:12px;font-weight:600;font-size:14px}
.tag{display:inline-block;background:linear-gradient(135deg,#eef2ff,#e0e7ff);color:var(--accent);font-size:12px;padding:3px 10px;border-radius:999px;font-weight:600;margin-right:6px}
/* 问答 */
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:16px;overflow:hidden}
.faq-q{padding:18px 22px;font-weight:700;font-size:17px;cursor:pointer;display:flex;gap:12px;align-items:flex-start}
.faq-q .qno{flex:none;width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--grad-b),var(--grad-c));color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800}
.faq-a{padding:0 22px 20px;color:#374151;font-size:15px}
.faq-a ol.steps{margin:10px 0 0 22px}
.faq-a ol.steps li{margin-bottom:8px}
/* 新闻 */
.news-card{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;display:flex;flex-direction:column}
.news-card img{width:100%;height:180px;object-fit:cover;border-radius:0}
.news-card .body{padding:18px}
.news-card h3{font-size:17px;line-height:1.5;margin:8px 0}
.news-card .meta{font-size:12px;color:var(--sub);display:flex;gap:12px;flex-wrap:wrap}
/* 面包屑 */
.crumb{background:#fff;border-bottom:1px solid var(--line);padding:12px 0;font-size:13px;color:var(--sub)}
.crumb a{color:var(--sub)}
.crumb span{color:var(--ink)}
/* 文章 */
.article{max-width:820px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:0 4px 18px rgba(0,0,0,.05)}
.article h1{font-size:30px;font-weight:900;line-height:1.4;margin-bottom:12px}
.article h2{font-size:22px;font-weight:800;margin:26px 0 12px;padding-left:12px;border-left:4px solid var(--grad-b)}
.article p{font-size:16px;color:#374151;margin-bottom:16px}
.article .byline{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;color:var(--sub);margin-bottom:18px;padding-bottom:16px;border-bottom:1px solid var(--line)}
/* 评论 */
.comments{margin-top:30px}
.comment{background:#f9fafb;border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:12px}
.comment .who{font-weight:700;font-size:14px;display:flex;gap:8px;align-items:center}
.comment .who .lv{font-size:11px;background:#eef2ff;color:var(--accent);padding:1px 8px;border-radius:6px}
.comment p{font-size:14px;color:#4b5563;margin:6px 0 0}
.comment .tm{font-size:12px;color:#9ca3af}
/* 侧栏 */
.side{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:18px}
.side h4{font-size:16px;font-weight:800;margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--grad-c)}
.side ul{list-style:none}
.side ul li{padding:7px 0;border-bottom:1px dashed var(--line);font-size:14px}
.side ul li:last-child{border-bottom:none}
.side .rank{display:inline-flex;width:20px;height:20px;background:linear-gradient(135deg,var(--warm),#f97316);color:#fff;border-radius:5px;font-size:11px;align-items:center;justify-content:center;margin-right:8px;font-weight:700}
/* 布局 */
.two-col{display:grid;grid-template-columns:1fr 300px;gap:24px;align-items:start}
/* 页脚 */
footer{background:linear-gradient(135deg,#111827,#1e3a8a);color:#cbd5e1;padding:44px 0 20px;margin-top:40px}
footer a{color:#e5e7eb}
footer .cols{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-bottom:28px}
footer h5{color:#fff;font-size:15px;margin-bottom:12px}
footer ul{list-style:none}
footer ul li{margin-bottom:8px;font-size:13px}
footer .copy{border-top:1px solid rgba(255,255,255,.15);padding-top:18px;font-size:12px;text-align:center;opacity:.8}
/* 面包屑列表 */
.breadcrumb-list{margin:14px 0;font-size:13px;color:var(--sub)}
.breadcrumb-list a{color:var(--accent)}
/* 响应式 */
@media(max-width:900px){
  .grid.c3,.grid.c4{grid-template-columns:repeat(2,1fr)}
  .grid.c2{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  footer .cols{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:560px){
  .grid.c3,.grid.c4{grid-template-columns:1fr}
  .article{padding:20px}
}