:root{
  --c1:#1a56db; --c2:#0ea5e9; --c3:#f59e0b; --bg:#f8fafc; --card:#fff;
  --text:#1e293b; --muted:#64748b; --border:#e2e8f0; --foot:#1e293b;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'PingFang SC','Microsoft YaHei','Noto Sans CJK SC',sans-serif;background:var(--bg);color:var(--text);line-height:1.8;font-size:15px}
a{color:var(--c1);text-decoration:none;transition:.2s}
a:hover{color:var(--c2)}
.wrap{max-width:1200px;margin:0 auto;padding:0 16px}
/* header */
header{background:linear-gradient(135deg,var(--c1),var(--c2));color:#fff;position:sticky;top:0;z-index:100;box-shadow:0 2px 8px rgba(0,0,0,.1)}
.header-top{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.logo{font-size:22px;font-weight:700;color:#fff;display:flex;align-items:center;gap:8px}
.logo span{font-size:12px;font-weight:400;opacity:.85;background:rgba(255,255,255,.2);padding:2px 8px;border-radius:10px}
nav ul{display:flex;list-style:none;gap:4px;flex-wrap:wrap}
nav a{color:rgba(255,255,255,.9);padding:8px 14px;border-radius:6px;font-size:14px;font-weight:500}
nav a:hover{background:rgba(255,255,255,.2);color:#fff}
.search-box{display:flex;gap:8px;align-items:center}
.search-box input{padding:8px 12px;border:none;border-radius:6px;font-size:13px;width:180px}
.search-box button{padding:8px 16px;background:var(--c3);color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:13px;font-weight:600}
/* breadcrumb */
.breadcrumb{padding:12px 0;font-size:13px;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--c1)}
.breadcrumb span{margin:0 6px}
/* main layout */
.main-grid{display:grid;grid-template-columns:1fr 320px;gap:24px;padding:16px 0 40px}
@media(max-width:900px){.main-grid{grid-template-columns:1fr}}
.content-area{min-width:0}
.sidebar{min-width:0}
/* cards */
.card{background:var(--card);border-radius:10px;padding:20px;margin-bottom:20px;box-shadow:0 1px 3px rgba(0,0,0,.06);border:1px solid var(--border)}
.card h2{font-size:18px;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--c1);display:flex;justify-content:space-between;align-items:center}
.card h2 a{font-size:13px;font-weight:400}
/* hero */
.hero{background:linear-gradient(135deg,var(--c1),var(--c2));color:#fff;border-radius:12px;padding:36px;margin-bottom:24px}
.hero h1{font-size:28px;margin-bottom:12px}
.hero p{font-size:15px;opacity:.9;max-width:700px}
.hero .tags{margin-top:16px;display:flex;gap:8px;flex-wrap:wrap}
.hero .tags a{background:rgba(255,255,255,.2);color:#fff;padding:4px 12px;border-radius:14px;font-size:12px}
/* article list */
.article-list{display:grid;gap:14px}
.article-item{display:flex;gap:16px;padding:14px;border-radius:8px;background:var(--bg);transition:.2s;border:1px solid transparent}
.article-item:hover{border-color:var(--c1);background:#fff}
.article-item .num{font-size:24px;font-weight:700;color:var(--c3);min-width:36px;text-align:center}
.article-item .info{flex:1}
.article-item h3{font-size:16px;margin-bottom:6px}
.article-item h3 a{color:var(--text)}
.article-item .meta{font-size:12px;color:var(--muted);display:flex;gap:12px}
.article-item .desc{font-size:13px;color:var(--muted);margin-top:4px;line-clamp:2;-webkit-line-clamp:2;display:-webkit-box;-webkit-box-orient:vertical;overflow:hidden}
/* channel grid */
.channel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}
@media(max-width:768px){.channel-grid{grid-template-columns:1fr}}
.channel-card{background:#fff;border-radius:10px;padding:18px;border:1px solid var(--border);transition:.2s}
.channel-card:hover{border-color:var(--c1);box-shadow:0 4px 12px rgba(26,86,219,.1)}
.channel-card h3{font-size:16px;color:var(--c1);margin-bottom:10px}
.channel-card ul{list-style:none}
.channel-card li{padding:4px 0;font-size:13px}
.channel-card li a{color:var(--text)}
.channel-card li a:hover{color:var(--c1)}
/* article page */
.article-header{margin-bottom:20px}
.article-header h1{font-size:26px;line-height:1.5;margin-bottom:12px}
.article-header .meta{font-size:13px;color:var(--muted);display:flex;gap:16px;flex-wrap:wrap;padding:10px 0;border-bottom:1px solid var(--border)}
.article-header .tag{display:inline-block;background:#eff6ff;color:var(--c1);padding:2px 10px;border-radius:4px;font-size:12px;margin-right:6px}
.article-body{font-size:16px;line-height:2}
.article-body h2{font-size:20px;margin:24px 0 12px;padding-left:12px;border-left:4px solid var(--c1)}
.article-body h3{font-size:17px;margin:18px 0 10px;color:var(--text)}
.article-body p{margin-bottom:16px}
.article-body .faq{background:var(--bg);border-radius:8px;padding:16px;margin:20px 0}
.article-body .faq h3{margin-top:0}
.article-body .faq dt{font-weight:600;margin-top:12px;color:var(--c1)}
.article-body .faq dd{margin:6px 0 0 0;padding-left:16px;font-size:14px}
.article-body .knowledge-block{background:#fffbeb;border-left:4px solid var(--c3);padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0}
.article-body .knowledge-block p{margin-bottom:10px}
.toc{background:var(--bg);border-radius:8px;padding:16px;margin-bottom:20px}
.toc h3{font-size:14px;margin-bottom:8px;color:var(--muted)}
.toc ul{list-style:none}
.toc li{padding:3px 0;font-size:14px}
.related{margin-top:30px}
.related h2{font-size:18px;margin-bottom:12px}
.related ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px}
@media(max-width:600px){.related ul{grid-template-columns:1fr}}
.related li a{display:block;padding:8px 12px;background:var(--bg);border-radius:6px;font-size:14px}
.related li a:hover{background:#eff6ff}
/* sidebar widgets */
.widget{background:#fff;border-radius:10px;padding:18px;margin-bottom:20px;border:1px solid var(--border)}
.widget h3{font-size:15px;margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--c2);color:var(--text)}
.widget ul{list-style:none}
.widget li{padding:6px 0;border-bottom:1px dashed var(--border);font-size:13px}
.widget li:last-child{border-bottom:none}
.widget li a{color:var(--text);display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.widget .rank-num{display:inline-block;width:20px;height:20px;background:var(--border);color:#fff;text-align:center;line-height:20px;border-radius:4px;font-size:11px;margin-right:6px}
.widget .rank-num.top3{background:var(--c3)}
/* tools */
.tool-box{background:linear-gradient(135deg,#0ea5e9,#1a56db);border-radius:12px;padding:24px;color:#fff;margin-bottom:20px}
.tool-box h3{font-size:18px;margin-bottom:8px}
.tool-box p{font-size:13px;opacity:.9;margin-bottom:14px}
.tool-box a{display:inline-block;background:#fff;color:var(--c1);padding:8px 20px;border-radius:6px;font-weight:600;font-size:14px}
/* footer */
footer{background:var(--foot);color:#cbd5e1;padding:30px 0 20px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px;margin-bottom:20px}
@media(max-width:768px){.footer-grid{grid-template-columns:1fr 1fr}}
footer h4{color:#fff;font-size:15px;margin-bottom:12px}
footer ul{list-style:none}
footer li{padding:4px 0;font-size:13px}
footer a{color:#cbd5e1}
footer a:hover{color:#fff}
.footer-contact{background:rgba(255,255,255,.08);border-radius:8px;padding:14px;margin:12px 0;font-size:14px;line-height:2}
.footer-contact strong{color:var(--c3)}
.footer-links{border-top:1px solid rgba(255,255,255,.1);padding-top:16px;margin-top:16px}
.footer-links h4{color:#94a3b8;font-size:13px;margin-bottom:8px}
.footer-links .links{display:flex;flex-wrap:wrap;gap:8px}
.footer-links .links a{background:rgba(255,255,255,.08);padding:3px 10px;border-radius:4px;font-size:12px}
.copyright{text-align:center;padding-top:16px;border-top:1px solid rgba(255,255,255,.1);font-size:12px;color:#64748b}
/* pagination */
.pagination{display:flex;justify-content:center;gap:6px;margin:20px 0}
.pagination a,.pagination span{padding:6px 12px;border:1px solid var(--border);border-radius:6px;font-size:13px}
.pagination .current{background:var(--c1);color:#fff;border-color:var(--c1)}
/* mobile nav toggle */
.menu-toggle{display:none;background:none;border:none;color:#fff;font-size:24px;cursor:pointer}
@media(max-width:768px){
  .menu-toggle{display:block}
  nav ul{display:none;position:absolute;top:100%;left:0;right:0;background:var(--c1);flex-direction:column;padding:10px}
  nav ul.show{display:flex}
  nav a{display:block}
  .search-box{display:none}
}