/* CHNLLM.COM 国产大模型导航 — 白底科技蓝金 */
:root{
  --blue:#015293; --blue-deep:#0A2E5C; --blue-soft:#E8F0F8; --blue-mid:#4B8ABD;
  --gold:#C0B283; --gold-dark:#A89B6F; --gold-light:#F5F1E4;
  --red:#B5433A; --bg:#FFFFFF; --bg-soft:#F6F9FC; --line:#DDE6EF;
  --text:#1A2333; --gray:#5A6B7E; --light:#8FA1B3;
  --radius:10px; --shadow:0 2px 14px rgba(10,46,92,.07);
  --mono:'SF Mono',ui-monospace,'Cascadia Code',Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
  font-size:16.5px;line-height:1.78;color:var(--text);background:var(--bg)}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--gold-dark)}
img{max-width:100%;display:block}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}

/* ===== header ===== */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line)}
.header-in{max-width:1160px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--blue-deep)}
.logo-mark{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--blue),var(--blue-mid));
  color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800;font-family:var(--mono)}
.logo em{font-style:normal;color:var(--gold-dark);font-family:var(--mono);font-size:13px;font-weight:600}
.nav{display:flex;gap:26px;align-items:center}
.nav a{color:var(--gray);font-size:15px;font-weight:500;padding:4px 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a.active{color:var(--blue);border-bottom-color:var(--gold)}
@media(max-width:820px){.nav{gap:14px}.nav a{font-size:13.5px}.logo em{display:none}}

/* ===== hero ===== */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#FBFDFF 0%,#F2F7FC 100%);
  border-bottom:1px solid var(--line)}
#constellation{position:absolute;inset:0;width:100%;height:100%}
.hero-in{position:relative;z-index:2;max-width:1160px;margin:0 auto;padding:88px 24px 72px;text-align:center}
.hero h1{font-size:42px;line-height:1.25;color:var(--blue-deep);font-weight:800;letter-spacing:1px}
.hero h1 .gd{color:var(--gold-dark)}
.hero .sub{margin:18px auto 0;color:var(--gray);font-size:16px;white-space:nowrap}
@media(max-width:1200px){.hero .sub{white-space:normal;font-size:15px}}
.hero-tags{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:26px}
.hero-tags span{font-family:var(--mono);font-size:12.5px;color:var(--blue);background:#fff;border:1px solid var(--line);
  border-radius:99px;padding:5px 14px;box-shadow:var(--shadow)}

/* ===== stats bar ===== */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:-34px;position:relative;z-index:3}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:18px 16px;text-align:center}
.stat b{display:block;font-family:var(--mono);font-size:26px;color:var(--blue);font-weight:700}
.stat span{font-size:13px;color:var(--gray)}
@media(max-width:820px){.stats{grid-template-columns:repeat(2,1fr)}}

/* ===== sections ===== */
.section{padding:56px 0}
.section.alt{background:var(--bg-soft)}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:28px}
.sec-head h2{font-size:26px;color:var(--blue-deep);font-weight:700;position:relative;padding-left:16px}
.sec-head h2::before{content:'';position:absolute;left:0;top:6px;bottom:6px;width:4px;border-radius:2px;
  background:linear-gradient(180deg,var(--blue),var(--gold))}
.sec-head .more{font-size:14px;color:var(--gray);white-space:nowrap}
.sec-head .more:hover{color:var(--gold-dark)}
.sec-head p{font-size:14px;color:var(--light)}

/* ===== category cards ===== */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.cat-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;
  box-shadow:var(--shadow);transition:.25s;position:relative;overflow:hidden}
.cat-card:hover{transform:translateY(-4px);border-color:var(--gold);box-shadow:0 8px 24px rgba(10,46,92,.12)}
.cat-card .num{position:absolute;right:14px;top:10px;font-family:var(--mono);font-size:34px;font-weight:800;
  color:var(--blue-soft);line-height:1}
.cat-card h3{font-size:17.5px;color:var(--blue-deep);margin-bottom:6px}
.cat-card p{font-size:13.5px;color:var(--gray);line-height:1.65}
.cat-card .cnt{display:inline-block;margin-top:10px;font-family:var(--mono);font-size:12.5px;color:var(--gold-dark)}
@media(max-width:960px){.cat-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.cat-grid{grid-template-columns:1fr}}

/* ===== news ===== */
.news-list{display:grid;gap:14px}
.news-item{display:flex;gap:18px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;box-shadow:var(--shadow)}
.news-item .tag{flex-shrink:0;align-self:flex-start;font-family:var(--mono);font-size:11.5px;font-weight:700;
  color:#fff;background:var(--blue);border-radius:6px;padding:3px 10px}
.news-item .tag.gd{background:var(--gold-dark)}
.news-item .tag.rd{background:var(--red)}
.news-item h3{font-size:16.5px;color:var(--text);margin-bottom:4px}
.news-item p{font-size:14px;color:var(--gray);line-height:1.7}
.news-item time{font-family:var(--mono);font-size:12px;color:var(--light)}
@media(max-width:680px){.news-item{flex-direction:column;gap:8px}}

/* ===== tables ===== */
.tbl-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;font-size:14px;min-width:720px}
th{background:var(--blue-soft);color:var(--blue-deep);font-weight:700;text-align:left;padding:12px 14px;
  white-space:nowrap;font-size:13.5px;border-bottom:2px solid var(--gold)}
td{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:none}
tbody tr:hover{background:#FAFCFE}
td .mname{font-weight:700;color:var(--blue-deep)}
td .ven{font-size:12.5px;color:var(--gray)}
.price{font-family:var(--mono);font-size:13px;color:var(--blue);white-space:nowrap}
.ctx{font-family:var(--mono);font-size:12.5px;color:var(--gray);white-space:nowrap}
.note{font-size:13px;color:var(--light);margin-top:12px;line-height:1.7}

/* ===== badges ===== */
.bdg{display:inline-block;font-size:11.5px;font-weight:600;border-radius:5px;padding:2px 8px;white-space:nowrap}
.bdg.os{background:#EAF3EC;color:#2E7D4F;border:1px solid #CBE3D3}
.bdg.cs{background:#EDF1F6;color:#5A6B7E;border:1px solid #D5DEE8}
.bdg.gd{background:var(--gold-light);color:var(--gold-dark);border:1px solid #E3DCC5}

/* ===== tabs ===== */
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px}
.tab{font-size:14px;color:var(--gray);background:#fff;border:1px solid var(--line);border-radius:99px;
  padding:7px 18px;cursor:pointer;transition:.2s}
.tab:hover{border-color:var(--gold);color:var(--blue)}
.tab.on{background:var(--blue);border-color:var(--blue);color:#fff}
.grp{margin-bottom:34px}
.grp h3{font-size:19px;color:var(--blue-deep);margin-bottom:12px;padding-left:12px;border-left:4px solid var(--gold)}

/* ===== tier / podium ===== */
.tiers{display:grid;gap:14px}
.tier{display:flex;gap:18px;align-items:flex-start;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow)}
.tier .lv{flex-shrink:0;width:86px;text-align:center}
.tier .lv b{display:block;font-family:var(--mono);font-size:15px;color:#fff;background:var(--blue);
  border-radius:8px;padding:6px 0}
.tier.t1 .lv b{background:linear-gradient(135deg,var(--gold-dark),var(--gold))}
.tier .lv span{font-size:11.5px;color:var(--light)}
.tier .who{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.pill{font-size:14px;font-weight:600;color:var(--blue-deep);background:var(--blue-soft);border:1px solid #C9DAEB;
  border-radius:8px;padding:5px 14px}
.tier p{font-size:13.5px;color:var(--gray);margin-top:6px;line-height:1.7}

/* ===== article blocks ===== */
.prose{max-width:860px}
.prose p{margin-bottom:14px;color:var(--text)}
.prose h3{font-size:19px;color:var(--blue-deep);margin:26px 0 12px;padding-left:12px;border-left:4px solid var(--gold)}
.prose ul{margin:0 0 14px 22px;color:var(--gray);font-size:15px}
.prose li{margin-bottom:6px}
.callout{background:var(--gold-light);border:1px solid #E3DCC5;border-radius:var(--radius);
  padding:16px 20px;font-size:14px;color:var(--text);margin:18px 0}
.callout b{color:var(--gold-dark)}

/* ===== page hero (sub) ===== */
.page-hero{background:linear-gradient(180deg,#FBFDFF,#F2F7FC);border-bottom:1px solid var(--line);
  position:relative;overflow:hidden}
.page-hero .hero-in{padding:64px 24px 48px;text-align:left}
.page-hero h1{font-size:32px;color:var(--blue-deep);font-weight:800}
.page-hero .sub{margin:10px 0 0;color:var(--gray);font-size:15.5px;max-width:none}
.crumb{font-family:var(--mono);font-size:12.5px;color:var(--light);margin-bottom:14px}
.crumb a{color:var(--gray)}

/* ===== banner img ===== */
.banner{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);
  margin-bottom:28px;position:relative}
.banner img{width:100%;height:240px;object-fit:cover}
.banner .cap{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(transparent,rgba(10,46,92,.78));
  color:#fff;font-size:13.5px;padding:26px 18px 12px}
.banner .cap b{font-family:var(--mono)}

/* ===== footer ===== */
.site-footer{border-top:1px solid var(--line);background:#fff;margin-top:20px}
.footer-in{max-width:1160px;margin:0 auto;padding:26px 24px;text-align:center;color:var(--gray);font-size:13px;line-height:2}
.footer-in .fnav{display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.footer-in .fnav a{color:var(--gray)}
.footer-in .fnav a:hover{color:var(--gold-dark)}
.footer-in .copy{color:var(--light);font-size:12.5px}

/* ===== i18n: lang switcher ===== */
.hmenu{display:flex;align-items:center;gap:22px}
.langs{display:flex;align-items:center;gap:2px;font-family:var(--mono);font-size:12.5px}
.langs a{color:var(--gray);padding:6px 8px;border-radius:6px;white-space:nowrap}
.langs a:hover{color:var(--blue);background:var(--blue-soft)}
.langs a.on{color:#fff;background:var(--blue)}
/* burger */
.burger{display:none;width:42px;height:40px;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  background:none;border:1px solid var(--line);border-radius:8px;cursor:pointer}
.burger span{display:block;width:18px;height:2px;background:var(--blue-deep);border-radius:2px;transition:.25s}
body.nav-open .burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
body.nav-open .burger span:nth-child(2){opacity:0}
body.nav-open .burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== mobile ===== */
@media(max-width:880px){
  .burger{display:flex}
  .hmenu{position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;
    padding:4px 0 10px;border-bottom:1px solid var(--line);box-shadow:0 16px 30px rgba(10,46,92,.14);display:none}
  body.nav-open .hmenu{display:flex}
  .nav{flex-direction:column;align-items:stretch;gap:0}
  .nav a{padding:13px 22px;font-size:15.5px;border-bottom:none}
  .nav a.active{background:var(--blue-soft);color:var(--blue)}
  .nav a:hover{background:var(--blue-soft)}
  .langs{margin:8px 16px 2px;padding-top:12px;border-top:1px solid var(--line);flex-wrap:wrap}
  .langs a{padding:9px 10px}
}
@media(max-width:520px){
  .logo{font-size:17px}
  .logo em{display:none}
  .header-in{padding:0 18px}
}
@media(max-width:680px){
  .wrap{padding:0 18px}
  .hero-in{padding:60px 18px 48px}
  .hero h1{font-size:clamp(28px,8vw,42px);letter-spacing:0}
  .page-hero .hero-in{padding:44px 18px 36px}
  .page-hero h1{font-size:clamp(24px,6.5vw,32px)}
  .section{padding:42px 0}
  .sec-head{flex-direction:column;gap:4px;margin-bottom:20px}
  .sec-head h2{font-size:22px}
  .news-item{padding:16px 16px}
  .tier{flex-direction:column;gap:10px;padding:16px 16px}
  .tier .lv{width:auto;display:flex;align-items:center;gap:10px;text-align:left}
  .tier .lv b{display:inline-block;padding:5px 14px}
  .banner img{height:180px}
  .tabs{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:8px;margin-bottom:18px}
  .tab{flex-shrink:0}
  table{font-size:13px;min-width:660px}
  th,td{padding:10px 12px}
  .price,.ctx{white-space:normal}
  .footer-in{padding:22px 16px}
}
/* touch targets on desktop-ish small widths */
@media(max-width:880px){.nav a{border-radius:8px}}

/* ===== RTL (Arabic) ===== */
html[dir="rtl"] body{font-family:Tahoma,'Segoe UI','Noto Sans Arabic','Geeza Pro',sans-serif}
html[dir="rtl"] .hero h1,html[dir="rtl"] .sec-head h2{letter-spacing:0}
html[dir="rtl"] .sec-head h2{padding-left:0;padding-right:16px}
html[dir="rtl"] .sec-head h2::before{left:auto;right:0}
html[dir="rtl"] .grp h3,html[dir="rtl"] .prose h3{padding-left:0;padding-right:12px;border-left:none;border-right:4px solid var(--gold)}
html[dir="rtl"] .prose ul{margin-left:0;margin-right:22px}
html[dir="rtl"] .cat-card .num{right:auto;left:14px}
html[dir="rtl"] th{text-align:right}
html[dir="rtl"] .crumb{direction:rtl}
html[dir="rtl"] .page-hero .hero-in{text-align:right}
html[dir="rtl"] .tbl-wrap th:first-child,html[dir="rtl"] .tbl-wrap td:first-child{padding-right:14px}