/* =========================================================
   673282.com — 比特币行情资讯内容站 (L0 首页 / L1 分类 / L2 文章)
   左主右栏 SEO 内容站布局，浅色专业
   ========================================================= */
:root{--primary:#2563eb;--text:#1a1a1a;--muted:#666;--line:#e5e7eb;--bg:#f7f8fa;--maxw:1120px}
*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--bg);color:var(--text);font-family:-apple-system,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;line-height:1.75;font-size:15px}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* 导航 */
.nav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.nav .wrap{display:flex;align-items:center;height:58px;gap:24px}
.logo{font-weight:800;font-size:18px;flex-shrink:0}
.logo i{display:inline-block;width:24px;height:24px;border-radius:6px;background:linear-gradient(135deg,#2563eb,#0ea5e9);margin-right:8px;vertical-align:-5px}
.nav-links{display:flex;gap:22px}
.nav-links a{font-size:14px;color:var(--muted)}
.nav-links a:hover{color:var(--primary)}
.nav-links a.on{color:var(--primary);font-weight:700}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:10px}
.btn-reg{display:inline-block;background:linear-gradient(135deg,#2563eb,#0ea5e9);color:#fff;font-weight:700;font-size:14px;padding:9px 22px;border-radius:8px}
.btn-reg:hover{box-shadow:0 6px 16px rgba(37,99,235,.3)}
.burger{display:none;font-size:22px;background:none;border:none;cursor:pointer;color:var(--text)}
.nav-mobile{display:none;flex-direction:column;background:#fff;border-bottom:1px solid var(--line)}
.nav-mobile a{padding:12px 24px;font-size:14px;color:var(--text);border-bottom:1px solid var(--line)}
.nav-mobile a:last-child{border-bottom:none}
.nav-mobile.show{display:flex !important}

/* 快讯条 */
.ticker{background:#fff;border-bottom:1px solid var(--line);font-size:13px;padding:8px 0;color:var(--muted)}
.ticker .wrap{display:flex;gap:0;overflow:hidden;white-space:nowrap}
.ticker .label{color:var(--primary);font-weight:700;margin-right:16px;flex-shrink:0}
.ticker .it{display:inline-block;padding-right:24px;color:var(--muted)}
.ticker .it::after{content:'·';margin-left:24px;color:#d1d5db}

/* 大头条 */
.feature{background:#fff;border-bottom:1px solid var(--line);padding:24px 0}
.feature .wrap{display:flex;gap:24px;align-items:center}
.feature .txt{flex:1}
.feature .tag{display:inline-block;font-size:12px;color:var(--primary);background:#eef2ff;border:1px solid #dbeafe;padding:3px 12px;border-radius:4px;font-weight:700;margin-bottom:10px}
.feature h1{font-size:clamp(20px,2.6vw,28px);font-weight:800;line-height:1.4;margin-bottom:10px}
.feature h1 a:hover{color:var(--primary)}
.feature p{color:var(--muted);font-size:14px}
.feature .img{width:300px;height:170px;border-radius:10px;flex-shrink:0;background:linear-gradient(135deg,#1e293b,#0f172a);color:#e2e8f0;padding:12px;overflow:hidden}

/* 主区域：左内容 + 右侧栏 */
.main{display:flex;gap:26px;padding:24px 0;align-items:flex-start}
.left{flex:1;min-width:0}
.col-title{font-size:18px;font-weight:800;margin:8px 0 16px;padding-left:10px;border-left:4px solid var(--primary)}
.art{border:1px solid var(--line);background:#fff;border-radius:10px;padding:16px 18px;margin-bottom:12px;display:block;transition:.2s}
.art:hover{border-color:var(--primary);box-shadow:0 6px 18px rgba(37,99,235,.06)}
.art .meta{font-size:12px;color:#999;margin-bottom:6px}
.art .meta span{margin-right:12px}
.art h3{font-size:17px;font-weight:700;line-height:1.5;margin-bottom:6px}
.art h3:hover{color:var(--primary)}
.art p{font-size:13px;color:var(--muted);line-height:1.7}
.ad-banner{margin-top:14px;border:2px dashed #cbd5e1;border-radius:12px;height:260px;display:flex;align-items:center;justify-content:center;color:#94a3b8;font-size:14px;background:#f8fafc;overflow:hidden}
.ad-banner img{width:100%;height:100%;object-fit:cover}

/* 右侧栏 */
.side{width:300px;flex-shrink:0}
.s-box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;margin-bottom:16px}
.s-box h4{font-size:15px;font-weight:800;margin-bottom:12px;padding-left:9px;border-left:3px solid var(--primary)}
.s-box .hot{padding:9px 0;border-bottom:1px solid var(--line);font-size:14px;line-height:1.5}
.s-box .hot:last-child{border-bottom:none}
.s-box .hot:hover{color:var(--primary)}
.s-box .cat{display:block;padding:8px 10px;font-size:14px;color:var(--muted)}
.s-box .cat:hover{color:var(--primary);background:#f7f8fa}
.s-box .tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.s-box .tag-cloud a{font-size:12px;color:var(--muted);border:1px solid var(--line);padding:3px 10px;border-radius:14px}
.s-box .tag-cloud a:hover{color:var(--primary);border-color:var(--primary)}
.s-box .note{font-size:12px;color:#999;line-height:1.8}
.mkt-mini .mr{display:flex;justify-content:space-between;padding:7px 0;border-bottom:1px solid var(--line);font-size:13px;font-family:monospace}
.mkt-mini .mr:last-child{border-bottom:none}
.mkt-note{font-size:11px;color:#999;margin-top:6px;text-align:right}
.s-box .regbox{background:linear-gradient(135deg,#2563eb,#0ea5e9);color:#fff;text-align:center;padding:16px;border-radius:10px}
.s-box .regbox b{font-size:15px;display:block;margin-bottom:8px}
.s-box .regbox .btn{background:#fff;color:#2563eb;font-weight:700;padding:9px 20px;border-radius:8px;font-size:14px}

/* 图文专题 */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}
.feat-card{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:.2s}
.feat-card:hover{border-color:var(--primary);box-shadow:0 8px 24px rgba(37,99,235,.08)}
.feat-card .im{height:110px;display:flex;align-items:center;justify-content:center;font-size:13px}
.feat-card .bd{padding:14px 16px}
.feat-card .bd h4{font-size:15px;font-weight:700;line-height:1.5;margin-bottom:6px}
.feat-card .bd h4:hover{color:var(--primary)}
.feat-card .bd p{font-size:12px;color:var(--muted);line-height:1.7}

/* 栏目推荐 */
.cats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding-bottom:24px}
.cat-box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}
.cat-box h3{font-size:15px;font-weight:800;margin-bottom:10px}
.cat-box a{display:block;padding:7px 0;font-size:13px;color:var(--muted);border-bottom:1px solid #f0f2f5}
.cat-box a:last-child{border-bottom:none}
.cat-box a:hover{color:var(--primary)}

/* 页脚 */
footer{border-top:1px solid var(--line);background:#fff;padding:30px 0 0}
.foot-main{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px;padding-bottom:24px}
.foot-main h4{font-size:14px;margin-bottom:10px}
.foot-main a{display:block;font-size:13px;color:var(--muted);padding:3px 0}
.foot-main a:hover{color:var(--primary)}
.foot-main p{font-size:13px;color:var(--muted);line-height:1.8}
.foot-bar{border-top:1px solid var(--line);padding:14px 0;font-size:12px;color:#999;display:flex;justify-content:space-between;flex-wrap:wrap}

/* L1 分类页 — 行情时间线列表 */
.cat-head{padding:24px 0 8px}
.cat-head .crumb{font-size:13px;color:var(--muted);margin-bottom:10px}
.cat-head h1{font-size:26px;font-weight:800}
.cat-head p{color:var(--muted);font-size:14px;margin-top:8px}
/* 行情数据带 */
.mkt-band{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-bottom:20px}
.mkt-band .b-h{background:#f8f9fb;padding:8px 18px;font-size:12px;color:#999;border-bottom:1px solid var(--line)}
.mkt-band .b-row{display:grid;grid-template-columns:1.2fr 1fr 1fr;padding:10px 18px;border-bottom:1px solid var(--line);font-size:14px;font-family:monospace;align-items:center}
.mkt-band .b-row:last-child{border-bottom:none}
.mkt-band .up{color:#16a34a}.mkt-band .down{color:#dc2626}
/* 时间线列表 */
.tl{padding:6px 0 8px}
.tl-item{display:flex;gap:16px;padding:16px 0;border-bottom:1px solid var(--line);position:relative}
.tl-item::before{content:'';position:absolute;left:-20px;top:0;bottom:0;width:3px;border-radius:2px;background:#e5e7eb}
.tl-item .date{width:66px;flex-shrink:0;text-align:center;font-size:12px;color:#999;padding-top:2px}
.tl-item .date b{display:block;font-size:16px;color:var(--primary)}
.tl-item .trend{width:8px;border-radius:4px;flex-shrink:0;background:#16a34a}
.tl-item .trend.down{background:#dc2626}
.tl-item .bd{flex:1;min-width:0}
.tl-item .bd .tag{display:inline-block;font-size:11px;color:var(--primary);background:#eef2ff;border:1px solid #dbeafe;padding:2px 8px;border-radius:4px;margin-bottom:6px}
.tl-item .bd h3{font-size:16px;font-weight:700;line-height:1.5;margin-bottom:4px}
.tl-item .bd h3:hover{color:var(--primary)}
.tl-item .bd p{font-size:13px;color:var(--muted)}
.pager{display:flex;justify-content:center;gap:8px;padding:20px 0 10px}
.pager a{min-width:36px;height:36px;line-height:36px;text-align:center;background:#fff;border:1px solid var(--line);border-radius:8px;font-size:14px;color:var(--muted);padding:0 10px}
.pager a:hover{color:var(--primary);border-color:var(--primary)}
.pager a.cur{background:var(--primary);color:#fff;font-weight:700;border:none}

/* L2 文章页 — 行情报告式 */
.art-top{background:#fff;border-bottom:1px solid var(--line)}
.art-top .wrap{padding:30px 20px 20px;max-width:860px}
.art-top .crumb{font-size:13px;color:var(--muted);margin-bottom:12px}
.art-top .crumb a{color:var(--primary)}
.art-top h1{font-size:clamp(20px,2.6vw,28px);font-weight:800;line-height:1.4}
.art-top .meta{display:flex;flex-wrap:wrap;gap:14px;margin-top:12px;font-size:13px;color:var(--muted)}
/* 行情快照面板 */
.snap{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:20px 0;max-width:860px}
.snap .sn{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.snap .sn .n{font-size:11px;color:#999;margin-bottom:4px}
.snap .sn .v{font-size:16px;font-weight:700;color:#0f172a;font-family:monospace}
.snap .sn .v.up{color:#16a34a}.sn .sn .v.down{color:#dc2626}
.art-main{padding:16px 0 8px}
.art-main .wrap{max-width:860px}
.art-body{background:#fff;padding:8px 0;font-size:16px;line-height:1.95;color:#1e293b}
.art-body h2{font-size:21px;font-weight:800;margin:28px 0 12px;padding-left:14px;border-left:4px solid var(--primary)}
.art-body h3{font-size:17px;font-weight:700;border-left:3px solid var(--primary);padding-left:10px;margin:22px 0 12px}
.art-body p{margin:13px 0;color:#475569}
.art-body img{border-radius:10px;margin:14px 0}
/* 数据解读框 */
.data-note{background:#f8fafc;border:1px solid var(--line);border-left:4px solid var(--primary);border-radius:10px;padding:16px 18px;margin:20px 0;font-size:14px;color:#475569}
.data-note b{color:var(--primary)}
.art-rel{border-top:1px solid var(--line);margin-top:20px;padding-top:18px}
.art-rel h3{font-size:15px;font-weight:800;margin-bottom:10px}
.art-rel .r-li{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--line);font-size:14px}
.art-rel .r-li:last-child{border-bottom:none}
.art-rel .r-li:hover{color:var(--primary)}
.art-rel time{color:var(--muted);font-size:12px}
.art-nav{display:flex;justify-content:space-between;gap:16px;margin-top:18px}
.art-nav a{flex:1;border:1px solid var(--line);border-radius:10px;padding:13px 16px;font-size:13px;color:var(--muted)}
.art-nav a:hover{border-color:var(--primary);color:var(--primary)}
.art-back{display:inline-block;margin:18px 0 6px;font-size:13px;color:var(--muted)}
.art-back:hover{color:var(--primary)}
@media(max-width:900px){.snap{grid-template-columns:repeat(2,1fr)}.tl-item::before{display:none}}

@media (max-width:900px){
  .feature .wrap{flex-direction:column}.feature .img{width:100%;height:140px}
  .main{flex-direction:column}.side{width:100%}
  .feat-grid,.cats{grid-template-columns:1fr}
  .foot-main{grid-template-columns:1fr 1fr}
  .art-list{grid-template-columns:1fr}
  .nav-links{display:none}.burger{display:inline-block}
}
@media (max-width:560px){.foot-main{grid-template-columns:1fr}}