:root{
  --brand:#c0392b; --brand2:#e95420; --brand-dark:#8f241c; --brand-soft:#fff1e8;
  --gold:#f59e0b; --ink:#1f2429; --muted:#6b7280;
  --line:#e8e1de; --bg:#f7f3f1; --card:#fff; --ok:#16a34a;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:linear-gradient(180deg,#fff7f2 0,#f7f3f1 260px,#f6f7f9 620px);line-height:1.6}
a{color:inherit;text-decoration:none}
.wrap{max-width:1100px;margin:0 auto;padding:0 16px}

/* SEO 提示条 */
.seobar{background:linear-gradient(90deg,var(--brand-dark),var(--brand),var(--brand2));color:#fff7ed;font-size:12px;padding:7px 0;border-bottom:3px solid #fbbf24}
.seobar .wrap{font-size:0}
.seobar .wrap *{font-size:0}
.seobar .wrap::before{content:"试管婴儿与不孕不育知识科普平台";font-size:12px;font-weight:700;letter-spacing:.2px}
.seobar code{color:#7dd3fc}
.seobar b{color:#fbbf24}

/* 顶栏 */
.topbar{background:#fff;border-bottom:1px solid #f1d1c8;position:sticky;top:0;z-index:20;box-shadow:0 6px 18px rgba(143,36,28,.08)}
.topbar .wrap{display:flex;align-items:center;gap:18px;height:64px}
.logo{font-size:22px;font-weight:900;color:var(--brand);white-space:nowrap;letter-spacing:.5px}
.logo span{color:var(--brand2)}
.nav{display:flex;gap:18px;flex-wrap:wrap;font-size:15px}
.nav a{position:relative;padding:4px 0}
.nav a::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:3px;background:linear-gradient(90deg,var(--brand),var(--brand2));border-radius:99px;opacity:0;transform:scaleX(.3);transition:.18s}
.nav a:hover{color:var(--brand)}
.nav a:hover::after{opacity:1;transform:scaleX(1)}
.nav .has-menu{position:relative;padding:4px 0}
.nav .menu-trigger{cursor:pointer;color:inherit}
.nav .menu-trigger::after{content:"";display:inline-block;margin-left:6px;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;vertical-align:middle}
.nav .dropdown{display:none;position:absolute;top:100%;left:50%;transform:translateX(-50%);min-width:210px;background:#fff;border:1px solid var(--line);border-top:4px solid var(--brand);border-radius:8px;box-shadow:0 18px 40px rgba(17,24,39,.14);padding:8px;z-index:80}
.nav .has-menu:hover .dropdown,.nav .has-menu:focus-within .dropdown{display:block}
.nav .dropdown a{display:block;padding:9px 12px;border-radius:6px;color:#374151;white-space:nowrap}
.nav .dropdown a:hover{background:#fff1e8;color:var(--brand)}
.nav .dropdown a::after{display:none}
.nav .province-dropdown{width:360px;display:none;grid-template-columns:repeat(3,1fr);gap:4px;left:0;transform:none}
.nav .has-menu:hover .province-dropdown,.nav .has-menu:focus-within .province-dropdown{display:grid}
.nav .province-dropdown a{font-size:13px;padding:7px 9px}
.nav .special-dropdown{width:560px;display:none;grid-template-columns:repeat(4,1fr);gap:4px;left:0;transform:none}
.nav .has-menu:hover .special-dropdown,.nav .has-menu:focus-within .special-dropdown{display:grid}
.nav .special-dropdown a{font-size:13px;padding:7px 9px}
.nav .special-dropdown b{grid-column:1/-1;color:#9f2f24;background:#fff1e8;border-radius:6px;padding:5px 9px;font-size:13px;margin-top:2px}
.nav .know-dropdown{width:720px;display:none;left:0;transform:none;padding:14px 16px}
.nav .has-menu:hover .know-dropdown,.nav .has-menu:focus-within .know-dropdown{display:flex;gap:20px}
.nav .know-dropdown .kcol{flex:1;min-width:0}
.nav .know-dropdown .kcol b{display:block;color:#9f2f24;background:#fff1e8;border-radius:6px;padding:5px 9px;font-size:13px;font-weight:800;margin-bottom:4px}
.nav .know-dropdown .kcol a{display:block;font-size:13px;padding:5px 9px;white-space:nowrap}
@media(max-width:900px){.nav .know-dropdown{width:auto}.nav .has-menu:hover .know-dropdown{display:block}}
.cta{margin-left:auto;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;padding:9px 18px;border-radius:8px;font-weight:700;white-space:nowrap;box-shadow:0 8px 18px rgba(192,57,43,.25)}
.cta:hover{background:linear-gradient(135deg,#a93226,#dc4b1c)}

/* 通用区块 */
section{padding:30px 0}
section:nth-of-type(even){background:linear-gradient(180deg,rgba(255,247,237,.58),rgba(255,255,255,.18))}
h1,h2,h3{line-height:1.3}
.h2{font-size:22px;margin:0 0 16px;padding-left:14px;border-left:6px solid var(--brand);position:relative}
.h2::after{content:"";display:block;width:56px;height:4px;background:linear-gradient(90deg,var(--brand),var(--brand2));border-radius:99px;margin-top:8px}
.article,.relread,.cc{background:linear-gradient(180deg,#fff,#fffaf7);border:1px solid #ead8d1;border-radius:10px;box-shadow:0 14px 30px rgba(127,29,29,.07)}
.article{padding:22px 24px}
.article h1{border-left:6px solid var(--brand);padding-left:14px}
.article h1::after{content:"";display:block;width:64px;height:4px;background:linear-gradient(90deg,var(--brand),var(--brand2),#f59e0b);border-radius:99px;margin-top:10px}
.wrap>table,.article table{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 8px 18px rgba(127,29,29,.04)}
.grid{display:grid;gap:14px}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.g6{grid-template-columns:repeat(6,1fr)}
@media(max-width:860px){.g3,.g4,.g6{grid-template-columns:repeat(2,1fr)}.nav{display:none}}
.card{background:linear-gradient(180deg,#fff,#fffaf7);border:1px solid #ead8d1;border-radius:10px;padding:16px;position:relative;overflow:hidden;box-shadow:0 12px 28px rgba(127,29,29,.08)}
.card::before{content:"";position:absolute;left:0;top:0;width:100%;height:4px;background:linear-gradient(90deg,var(--brand),var(--brand2),var(--gold));opacity:.92}
.grid .card:nth-child(3n+2){background:linear-gradient(180deg,#fff,#f7fbff)}
.grid .card:nth-child(3n+2)::before{background:linear-gradient(90deg,#2563eb,#60a5fa,#fbbf24)}
.grid .card:nth-child(3n){background:linear-gradient(180deg,#fff,#fff7fb)}
.grid .card:nth-child(3n)::before{background:linear-gradient(90deg,#be185d,#fb7185,#f59e0b)}
.card h3{margin:0 0 6px;font-size:16px}
.card p{margin:0;color:var(--muted);font-size:13px}
.card .more{color:var(--brand);font-size:13px}

/* Hero */
.hero{background:linear-gradient(120deg,#fdf2f0,#fef6ec);border-bottom:1px solid var(--line)}
.hero .wrap{padding:46px 16px}
.hero h1{font-size:34px;margin:0 0 10px}
.hero .lead{font-size:17px;color:#444;max-width:680px}
.hero .kw{color:var(--brand);font-weight:700}
.btns{margin-top:22px;display:flex;gap:12px;flex-wrap:wrap}
.btn{padding:12px 24px;border-radius:10px;font-weight:600}
.btn-1{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 10px 24px rgba(192,57,43,.24)}
.btn-2{background:#fff;border:1px solid var(--brand);color:var(--brand)}

/* 快捷入口 */
.quick a{display:block;text-align:center}
.quick .ico{font-size:26px}

/* 列表 */
.list{background:linear-gradient(180deg,#fff,#fffaf7);border:1px solid #ead8d1;border-radius:10px;padding:8px 18px;box-shadow:0 10px 24px rgba(127,29,29,.07)}
.list li{list-style:none;border-bottom:1px dashed var(--line);padding:10px 0;font-size:14px;display:flex;justify-content:space-between}
.list li:last-child{border:0}
.list a:hover{color:var(--brand)}
.tag{display:inline-block;background:#fff7ed;border:1px solid #fed7aa;border-radius:999px;padding:4px 12px;margin:4px 6px 0 0;font-size:13px;color:#9a3412}
.tag:hover{border-color:var(--brand);color:var(--brand)}

/* 瑞生国际块 */
.rs{background:linear-gradient(120deg,#7f1d1d,#c0392b 55%,#e95420);color:#fff7ed;border-radius:12px;padding:28px;box-shadow:0 14px 32px rgba(127,29,29,.18)}
.rs h2{color:#fff;border:0;padding:0}
.rs .more{color:#7dd3fc}

/* 联系页 */
.contact-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:20px}
@media(max-width:860px){.contact-grid{grid-template-columns:1fr}}
.cc{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px}
.cc .big{font-size:30px;font-weight:800;color:var(--brand);letter-spacing:1px}
.qr{width:150px;height:150px;border:1px solid var(--line);border-radius:10px;display:grid;place-items:center;color:var(--muted);font-size:13px;background:#fafafa}
.field{display:block;width:100%;padding:11px;border:1px solid var(--line);border-radius:8px;margin-top:10px;font-size:14px}

/* 面包屑 */
.crumb{font-size:13px;color:var(--muted);padding:14px 0}
.crumb a:hover{color:var(--brand)}

/* 页脚 */
footer{background:linear-gradient(135deg,#11151a 0,#241212 48%,#7f1d1d 100%);color:#d1d5db;margin-top:30px;padding:34px 0 30px;font-size:14px;border-top:5px solid #f59e0b;box-shadow:0 -16px 34px rgba(127,29,29,.08)}
footer .cols{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
@media(max-width:860px){footer .cols{grid-template-columns:repeat(2,1fr)}}
footer h4{color:#fff;font-size:15px;margin:0 0 10px}
footer .cols>div{background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.09);border-radius:8px;padding:14px}
footer a{display:block;color:#d1d5db;padding:3px 0}
footer a:hover{color:#fff}
.foot-keys a{color:#fed7aa}
.copy{border-top:1px solid rgba(255,255,255,.12);margin-top:22px;padding-top:16px;color:#cbd5e1;font-size:12px;text-align:center}
.badge{display:inline-block;background:#16361f;color:#86efac;border:1px solid #1f5130;border-radius:6px;font-size:11px;padding:2px 8px;margin-left:6px}

/* 文章页公用样式 */
.article{max-width:820px;margin:0 auto}
.article h1{font-size:26px;margin:6px 0 4px}
.article .meta{color:var(--muted);font-size:13px;margin-bottom:16px}
.article h2{font-size:19px;margin:22px 0 8px;padding-left:10px;border-left:4px solid var(--brand)}
.article p{margin:10px 0}
.article a{color:var(--brand)}
.article a:hover{text-decoration:underline}
.article table{width:100%;border-collapse:collapse;margin:12px 0;font-size:14px}
.article th,.article td{border:1px solid var(--line);padding:8px 10px;text-align:left}
.article th{background:#faf3f1}
.disc{background:#fff7ed;border:1px solid #fed7aa;border-left:5px solid var(--brand);border-radius:8px;padding:12px;color:#7a3b2f;font-size:13px;margin-top:18px}
.relread{max-width:820px;margin:18px auto 0;background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px}
.relread h4{margin:0 0 8px;color:var(--brand);font-size:15px}
.relread a{display:inline-block;margin:3px 14px 3px 0;font-size:14px;color:#444}
.relread a:hover{color:var(--brand)}

/* 头部搜索 / 浮窗 / 搜索结果 */
.hsearch{display:flex;margin-left:auto;margin-right:12px}
.hsearch input{border:1px solid var(--line);border-radius:8px 0 0 8px;padding:8px 12px;font-size:14px;width:200px;outline:none}
.hsearch button{border:0;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border-radius:0 8px 8px 0;padding:8px 14px;cursor:pointer}
@media(max-width:860px){.hsearch input{width:120px}}
#yk-float{position:fixed;right:14px;bottom:24px;z-index:50}
#yk-float a{display:flex;flex-direction:column;align-items:center;justify-content:center;width:66px;height:66px;border-radius:50%;background:linear-gradient(135deg,#8f241c,#c0392b,#f97316);color:#fff;font-size:13px;font-weight:800;line-height:1.15;text-align:center;box-shadow:0 8px 20px rgba(192,57,43,.35)}
#yk-float a span{margin-top:2px}
#yk-results{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:60;align-items:flex-start;justify-content:center}
#yk-results .box{background:#fff;margin-top:90px;width:min(560px,92%);border-radius:12px;padding:16px 20px;max-height:70vh;overflow:auto}
#yk-results h4{margin:0 0 10px;color:var(--brand)}
#yk-results #yk-list a{display:block;padding:8px 0;border-bottom:1px dashed var(--line);color:#333}
#yk-results #yk-list a:hover{color:var(--brand)}

/* 城市页专题承接区 */
.city-hub{margin-top:24px}
.city-hub .city-hub-hero{background:linear-gradient(135deg,#8f241c,#c0392b 55%,#f97316);color:#fff;border-radius:10px;padding:22px 24px;box-shadow:0 18px 34px rgba(127,29,29,.16)}
.city-hub .city-hub-hero h2{margin:0 0 8px;font-size:22px}
.city-hub .city-hub-hero p{margin:0;color:#fff7ed}
.city-hub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:16px}
.city-topic{background:linear-gradient(180deg,#fff,#fffaf7);border:1px solid #ead8d1;border-radius:10px;padding:16px;box-shadow:0 14px 30px rgba(127,29,29,.07);position:relative;overflow:hidden}
.city-topic::before{content:"";position:absolute;left:0;right:0;top:0;height:5px;background:linear-gradient(90deg,#c0392b,#e95420,#f59e0b)}
.city-topic:nth-child(2),.city-topic:nth-child(5){background:linear-gradient(180deg,#fff,#f7fbff)}
.city-topic:nth-child(2)::before,.city-topic:nth-child(5)::before{background:linear-gradient(90deg,#2563eb,#60a5fa,#f59e0b)}
.city-topic:nth-child(3),.city-topic:nth-child(6){background:linear-gradient(180deg,#fff,#fff7fb)}
.city-topic:nth-child(3)::before,.city-topic:nth-child(6)::before{background:linear-gradient(90deg,#be185d,#fb7185,#f97316)}
.city-topic h3{margin:8px 0 8px;font-size:17px;color:#17212b}
.city-topic p{margin:0 0 10px;color:var(--muted);font-size:13px}
.city-topic a{display:block;padding:7px 0;border-bottom:1px dashed #ead8d1;color:#374151;font-size:14px}
.city-topic a:last-child{border-bottom:0}
.city-topic a:hover{color:var(--brand)}
.city-keywords{margin-top:16px;background:#fff;border:1px solid #ead8d1;border-radius:10px;padding:18px;box-shadow:0 12px 28px rgba(127,29,29,.06)}
.city-keywords h2{font-size:19px;margin:0 0 12px;padding-left:12px;border-left:5px solid var(--brand)}
.city-keyword-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px 16px}
.city-keyword-grid a{display:block;background:#fffaf7;border:1px solid #f1d1c8;border-radius:7px;padding:9px 10px;color:#374151;font-size:14px}
.city-keyword-grid a:hover{border-color:var(--brand);color:var(--brand);background:#fff1e8}
.city-note{margin-top:12px;color:var(--muted);font-size:12px}
@media(max-width:860px){.city-hub-grid,.city-keyword-grid{grid-template-columns:1fr}.city-hub .city-hub-hero{padding:18px}}

/* 城市页底部交叉导航(Tab) */
.ynav{background:#fff;border:1px solid var(--line);border-radius:12px;padding:6px 16px 18px;margin-top:20px;box-shadow:0 12px 28px rgba(127,29,29,.06)}
.ynav-tabs{display:flex;flex-wrap:wrap;gap:2px;border-bottom:1px solid var(--line);margin-bottom:14px}
.ynav-tabs button{border:0;background:none;padding:12px 16px;font-size:15px;color:#666;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px}
.ynav-tabs button:hover{color:var(--brand)}
.ynav-tabs button.on{color:var(--brand);border-bottom-color:var(--brand);font-weight:700}
.ynav-pane{display:none}
.ynav-pane.on{display:block}
.ynav-pane .tag{margin:5px 8px 0 0}