/* 51吃瓜网 - 门户资讯风格（响应式） */
:root{
  --bg:#f4f6fb;
  --surface:#ffffff;
  --surface-soft:#f8faff;
  --line:#e6ebf2;
  --text:#1b2430;
  --muted:#657285;
  --primary:#d7263d;
  --primary-deep:#b71e32;
  --accent:#0f5cc0;
  --chip:#eef3ff;
  --ok:#0f9d74;
  --radius:14px;
  --max:1180px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Microsoft YaHei","PingFang SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.72;
  min-height:100vh;
  display:flex;
  flex-direction:column;
}

img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:underline}

.container{width:min(100% - 28px, var(--max));margin-inline:auto}
main{flex:1;width:100%}

/* 顶栏 */
.topbar{
  position:sticky;top:0;z-index:80;
  background:rgba(255,255,255,.97);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(10px);
}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;padding:12px 0;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:10px}
.brand-badge{
  width:38px;height:38px;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),#f05a6d);
  color:#fff;font-weight:800;display:grid;place-items:center;
}
.brand-title{display:flex;flex-direction:column;gap:2px}
.brand-title strong{font-size:1.05rem;letter-spacing:.01em}
.brand-title span{color:var(--muted);font-size:.8rem}

#navToggle{position:absolute;opacity:0;pointer-events:none}
.nav-btn{
  display:none;
  padding:9px 12px;border-radius:999px;border:1px solid var(--line);
  background:#fff;color:var(--text);font-weight:600;
}
.nav{display:flex;gap:6px 10px;flex-wrap:wrap;align-items:center}
.nav a{
  color:var(--muted);
  padding:8px 11px;border-radius:8px;
  font-size:.92rem;font-weight:600;
}
.nav a:hover,.nav a[aria-current="page"]{
  color:#fff;background:var(--primary);text-decoration:none;
}
.nav-cta{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:9px 13px;border-radius:999px;border:1px solid var(--line);
  background:#fff;color:var(--text);font-size:.88rem;font-weight:700;
}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn.secondary{background:#fff6f7;border-color:#ffd5dc;color:var(--primary-deep)}

@media (max-width:960px){
  .nav-btn{display:inline-flex}
  .nav{
    width:100%;order:10;max-height:0;overflow:hidden;
    transition:max-height .35s ease;border-top:1px solid var(--line);
  }
  .nav a{display:block;padding:11px 8px}
  #navToggle:checked ~ .nav{max-height:500px;padding-top:8px}
}

/* 首屏 */
.hero{padding:22px 0 10px}
.hero-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:14px;
}
@media (min-width:1020px){
  .hero-grid{grid-template-columns:1.2fr .8fr}
}
.hero h1{
  margin:0 0 10px;
  font-size:clamp(1.5rem,3vw,2rem);
  line-height:1.3;
}
.hero p.lead{
  margin:0 0 12px;
  color:#2a3442;
  font-size:.98rem;
}
.hero-kpis{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:10px;
  margin-top:8px;
}
@media (min-width:600px){
  .hero-kpis{grid-template-columns:repeat(4,1fr)}
}
.kpi{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:10px;
  padding:10px;
}
.kpi strong{display:block;font-size:.95rem}
.kpi span{display:block;font-size:.8rem;color:var(--muted);margin-top:4px}

.hero-media{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
}
.hero-media img{width:100%;aspect-ratio:16/10;object-fit:cover}
.hero-media .cap{
  border-top:1px solid var(--line);
  padding:10px 12px;
  color:var(--muted);
  font-size:.82rem;
}

.quickbar{
  margin:8px 0 14px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:10px;
  padding:10px 12px;
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  align-items:center;
}
.quickbar strong{
  color:var(--primary-deep);
  font-size:.85rem;
}
.quickbar a{
  color:#355372;
  font-size:.86rem;
  padding:3px 8px;
  background:#f3f7ff;
  border-radius:999px;
}

.channel-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:10px;
  margin-bottom:14px;
}
@media (min-width:760px){
  .channel-grid{grid-template-columns:repeat(4,1fr)}
}
.channel-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:12px;
  padding:12px;
}
.channel-card h3{
  margin:0 0 6px;
  font-size:.98rem;
}
.channel-card p{
  margin:0;
  color:var(--muted);
  font-size:.84rem;
}

/* 区块 */
.section{padding:14px 0 20px}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:10px;flex-wrap:wrap;margin-bottom:10px;
}
.section-head h2{margin:0;font-size:1.15rem;line-height:1.35}
.section-head p{margin:0;color:var(--muted);font-size:.9rem;max-width:62ch}
.pill{
  display:inline-flex;align-items:center;
  padding:4px 9px;border-radius:999px;
  background:var(--chip);border:1px solid #dae5ff;
  color:#365ea8;font-size:.76rem;font-weight:700;
}
.pill.hot{
  background:#fff1f3;border-color:#ffd7dd;color:var(--primary-deep);
}

/* 信息流卡片 */
.list{
  display:grid;
  grid-template-columns:1fr;
  gap:10px;
}
@media (min-width:860px){
  .list{grid-template-columns:repeat(2,1fr)}
}
.item{
  display:grid;
  grid-template-columns:1fr;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
}
@media (min-width:560px){
  .item{grid-template-columns:170px 1fr}
}
.thumb{background:#eef2f8}
.thumb img{width:100%;height:100%;object-fit:cover;min-height:120px}
.body{padding:12px}
.meta{
  display:flex;flex-wrap:wrap;gap:8px;
  color:var(--muted);font-size:.77rem;margin-bottom:6px;
}
.tag{
  display:inline-flex;align-items:center;
  padding:2px 7px;border-radius:999px;
  background:#edf8f5;border:1px solid #cceee3;color:#0f7f5f;
  font-weight:700;
}
.tag.warn{background:#fff6ea;border-color:#ffe0b8;color:#9e6406}
.tag.alert{background:#fff1f3;border-color:#ffd9de;color:#b52138}
.body h3{
  margin:0 0 7px;
  font-size:1rem;line-height:1.4;
}
.body p{margin:0;color:#4b5a6b;font-size:.9rem;line-height:1.65}

/* 文章页 */
.article{padding:18px 0 28px}
.crumb{color:var(--muted);font-size:.84rem;margin-bottom:10px}
.article-head{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:14px;
}
.article-head h1{margin:0 0 8px;font-size:clamp(1.25rem,2.6vw,1.6rem);line-height:1.35}
.article-head .desc{margin:0;color:#465466;font-size:.94rem}
.cover{
  margin-top:10px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
}
.cover img{width:100%;aspect-ratio:21/9;object-fit:cover}
@media (max-width:640px){.cover img{aspect-ratio:16/10}}
.prose{
  margin-top:10px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:14px;
  color:#364354;
  font-size:.95rem;
  line-height:1.9;
}
.prose h2{
  margin:1.4em 0 .55em;
  color:var(--text);
  font-size:1.05rem;
}
.prose p{margin:0 0 .95em}
.prose ul{margin:0 0 .95em;padding-left:1.2em}
.prose strong{color:#1f2a36}
.related{
  margin-top:12px;
  display:flex;flex-direction:column;gap:7px;
}
.related a{
  color:var(--accent);
  font-size:.92rem;
}

.page-shell{
  display:grid;
  grid-template-columns:1fr;
  gap:12px;
}
@media (min-width:980px){
  .page-shell{grid-template-columns:280px 1fr}
}
.side-panel{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:12px;
  padding:12px;
  height:max-content;
}
.side-panel h3{
  margin:0 0 8px;
  font-size:1rem;
}
.side-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.side-list li{
  color:#3d4f66;
  font-size:.88rem;
  padding:6px 8px;
  background:var(--surface-soft);
  border-radius:8px;
}
.feed-panel{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:12px;
  padding:12px;
}

/* 新门户骨架 */
.portal-shell{
  display:grid;
  grid-template-columns:1fr;
  gap:12px;
  margin:14px 0 20px;
}
@media (min-width:1100px){
  .portal-shell{grid-template-columns:250px 1fr 280px}
}
.portal-col{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:12px;
  padding:12px;
}
.portal-col h2,.portal-col h3{
  margin:0 0 8px;
  font-size:1rem;
}
.topic-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:7px;
}
.topic-list li{
  border:1px solid var(--line);
  background:var(--surface-soft);
  border-radius:8px;
  padding:8px;
  font-size:.88rem;
}
.flash-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:8px;
}
.flash-list li{
  border-left:3px solid var(--primary);
  background:#fff7f8;
  padding:7px 8px 7px 10px;
  border-radius:0 8px 8px 0;
  font-size:.86rem;
  color:#3c4e64;
}
.feed-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:10px;
}
@media (min-width:860px){
  .feed-grid{grid-template-columns:repeat(2,1fr)}
}
.feed-card{
  border:1px solid var(--line);
  border-radius:10px;
  overflow:hidden;
  background:#fff;
}
.feed-card img{
  width:100%;
  aspect-ratio:16/9;
  object-fit:cover;
}
.feed-card .inner{padding:10px}
.feed-card h4{
  margin:0 0 6px;
  font-size:.96rem;
  line-height:1.42;
}
.feed-card p{
  margin:0;
  color:#55667b;
  font-size:.88rem;
}

.timeline{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:8px;
}
.timeline li{
  border:1px solid var(--line);
  border-radius:8px;
  padding:8px;
  background:#fff;
}
.timeline time{
  display:inline-block;
  color:var(--primary-deep);
  font-weight:700;
  font-size:.8rem;
  margin-bottom:3px;
}

/* 页脚 */
.footer{
  margin-top:auto;
  background:#fff;
  border-top:1px solid var(--line);
  padding:22px 0 16px;
}
.footer-grid{
  display:grid;grid-template-columns:1fr;gap:14px;
}
@media (min-width:760px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr}
}
.footer h4{margin:0 0 8px;font-size:.92rem}
.footer p{margin:0;color:var(--muted);font-size:.9rem;line-height:1.75}
.footer ul{list-style:none;margin:0;padding:0}
.footer li{margin-bottom:6px}
.footer a{color:#41546b}
.footer a:hover{color:var(--primary)}
.fineprint{
  margin-top:12px;padding-top:10px;
  border-top:1px solid var(--line);
  color:#8894a3;font-size:.82rem;text-align:center;
}