/* ============ KaKa API · 科技炫酷暗色主题 ============ */
:root{
  --bg:#05070f;
  --bg2:#0a0e1c;
  --surface:rgba(255,255,255,.04);
  --surface2:rgba(255,255,255,.06);
  --border:rgba(255,255,255,.09);
  --border-glow:rgba(34,211,238,.35);
  --txt:#e7ecf5;
  --txt-dim:#9aa6c0;
  --txt-faint:#5f6b86;
  --cyan:#22d3ee;
  --purple:#a855f7;
  --green:#34d399;
  --pink:#f472b6;
  --grad:linear-gradient(120deg,#22d3ee 0%,#a855f7 55%,#f472b6 100%);
  --grad-soft:linear-gradient(120deg,rgba(34,211,238,.15),rgba(168,85,247,.15));
  --r:16px;
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  background:var(--bg);color:var(--txt);line-height:1.6;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
/* 背景层 */
.bg-layer{position:fixed;inset:0;z-index:-2;background:
  radial-gradient(900px 600px at 12% -8%,rgba(34,211,238,.14),transparent 60%),
  radial-gradient(800px 600px at 92% 4%,rgba(168,85,247,.16),transparent 60%),
  radial-gradient(700px 700px at 50% 110%,rgba(244,114,182,.10),transparent 60%),
  var(--bg);}
.bg-grid{position:fixed;inset:0;z-index:-1;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:54px 54px;
  mask-image:radial-gradient(circle at 50% 30%,#000 0%,transparent 78%);}
.orb{position:fixed;border-radius:50%;filter:blur(70px);z-index:-1;opacity:.5;animation:float 14s ease-in-out infinite}
.orb.a{width:340px;height:340px;background:var(--cyan);top:-80px;left:-60px}
.orb.b{width:300px;height:300px;background:var(--purple);top:10%;right:-80px;animation-delay:-5s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(40px)}}

a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(18px);
  background:rgba(5,7,15,.72);border-bottom:1px solid var(--border)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:11px;font-weight:800;font-size:19px;letter-spacing:.3px}
.logo .mark{width:32px;height:32px;border-radius:9px;background:var(--grad);
  display:grid;place-items:center;font-size:17px;box-shadow:0 0 22px rgba(34,211,238,.5)}
.nav-links{display:flex;gap:30px;font-size:14.5px;color:var(--txt-dim)}
.nav-links a{transition:color .2s;position:relative}
.nav-links a:hover{color:var(--txt)}
.nav-cta{display:flex;gap:12px;align-items:center}
.menu-btn{display:none;background:none;border:1px solid var(--border);color:var(--txt);
  width:42px;height:38px;border-radius:10px;font-size:18px;cursor:pointer}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:11px;
  font-size:14.5px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:.22s;white-space:nowrap}
.btn-primary{background:var(--grad);color:#06080f;box-shadow:0 8px 30px rgba(34,211,238,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 38px rgba(168,85,247,.4)}
.btn-ghost{background:var(--surface);border-color:var(--border);color:var(--txt)}
.btn-ghost:hover{border-color:var(--border-glow);background:var(--surface2)}
.btn-lg{padding:14px 28px;font-size:15.5px}

/* ---------- Hero ---------- */
.hero{padding:96px 0 70px;text-align:center;position:relative}
.badge{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border-radius:999px;
  background:var(--surface);border:1px solid var(--border);font-size:13px;color:var(--txt-dim);margin-bottom:26px}
.badge .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 10px var(--green)}
.hero h1{font-size:clamp(34px,5.4vw,62px);line-height:1.08;font-weight:850;letter-spacing:-.5px;margin-bottom:22px}
.hero p.sub{font-size:clamp(15px,1.7vw,19px);color:var(--txt-dim);max-width:640px;margin:0 auto 38px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* 终端 */
.terminal{margin:48px auto 0;max-width:680px;text-align:left;background:rgba(8,11,22,.9);
  border:1px solid var(--border);border-radius:14px;overflow:hidden;
  box-shadow:0 30px 80px rgba(0,0,0,.5),0 0 0 1px rgba(34,211,238,.08)}
.term-bar{display:flex;align-items:center;gap:7px;padding:12px 15px;border-bottom:1px solid var(--border);background:rgba(255,255,255,.02)}
.term-bar i{width:11px;height:11px;border-radius:50%;display:block}
.term-bar .r{background:#ff5f57}.term-bar .y{background:#febc2e}.term-bar .g{background:#28c840}
.term-bar span{margin-left:9px;font-size:12.5px;color:var(--txt-faint)}
.term-body{padding:20px 18px;font-family:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13.5px;line-height:1.85}
.term-body .c{color:var(--cyan)}.term-body .p{color:var(--purple)}.term-body .g{color:var(--green)}
.term-body .m{color:var(--txt-dim)}.term-body .o{color:var(--txt)}
.cursor{display:inline-block;width:8px;height:16px;background:var(--cyan);vertical-align:-2px;animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}

/* ---------- 区块通用 ---------- */
.section{padding:78px 0}
.section-head{text-align:center;max-width:680px;margin:0 auto 50px}
.section-head .ey{font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--cyan);margin-bottom:12px}
.section-head h2{font-size:clamp(26px,3.4vw,40px);font-weight:800;letter-spacing:-.4px;margin-bottom:14px}
.section-head p{color:var(--txt-dim);font-size:15.5px}

/* 卡片网格 */
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:26px;
  transition:.25s;position:relative;overflow:hidden}
.card:hover{border-color:var(--border-glow);transform:translateY(-4px);background:var(--surface2);
  box-shadow:0 18px 50px rgba(0,0,0,.4)}
.card .ico{width:46px;height:46px;border-radius:12px;background:var(--grad-soft);
  border:1px solid var(--border);display:grid;place-items:center;font-size:22px;margin-bottom:18px}
.card h3{font-size:18px;font-weight:700;margin-bottom:10px}
.card p{color:var(--txt-dim);font-size:14px}
.card .step-n{position:absolute;top:18px;right:22px;font-size:34px;font-weight:850;color:rgba(255,255,255,.06)}

/* 模型概览 logo 墙 */
.providers{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:10px}
.prov{padding:14px 26px;border-radius:13px;background:var(--surface);border:1px solid var(--border);
  font-weight:700;font-size:17px;display:flex;align-items:center;gap:9px;transition:.2s}
.prov:hover{border-color:var(--border-glow);transform:translateY(-3px)}
.prov .pd{width:9px;height:9px;border-radius:50%;background:var(--green);box-shadow:0 0 8px var(--green)}

/* ---------- 模型广场 ---------- */
.filters{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:34px}
.chip{padding:8px 17px;border-radius:999px;background:var(--surface);border:1px solid var(--border);
  font-size:13.5px;color:var(--txt-dim);cursor:pointer;transition:.2s}
.chip:hover{color:var(--txt)}
.chip.active{background:var(--grad-soft);border-color:var(--border-glow);color:var(--txt)}
.models-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.model-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:22px;transition:.25s;position:relative}
.model-card:hover{border-color:var(--border-glow);transform:translateY(-4px);box-shadow:0 16px 44px rgba(0,0,0,.4)}
.model-card .mc-top{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:6px}
.model-card h3{font-size:17px;font-weight:700}
.model-card .prov{font-size:12.5px;color:var(--txt-dim)}
.tag{font-size:11px;padding:3px 9px;border-radius:7px;background:var(--grad-soft);border:1px solid var(--border);color:var(--cyan)}
.avail{display:inline-block;padding:3px 9px;border-radius:999px;font-size:11px;font-weight:600;white-space:nowrap}
.avail.on{background:rgba(16,185,129,.15);color:#10b981;border:1px solid rgba(16,185,129,.4)}
.avail.off{background:rgba(239,68,68,.12);color:#ef4444;border:1px solid rgba(239,68,68,.35)}
.avail.unk{background:rgba(148,163,184,.12);color:#94a3b8;border:1px solid rgba(148,163,184,.3)}
.model-card.disabled{opacity:.55;filter:grayscale(.35)}
.avail-counter{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:9px;background:rgba(99,102,241,.1);border:1px solid rgba(99,102,241,.35);color:#a5b4fc;font-size:13px;font-weight:600}
.price-row{display:flex;gap:22px;margin:16px 0 12px}
.price-row .pr .l{font-size:11.5px;color:var(--txt-faint);text-transform:uppercase;letter-spacing:.5px}
.price-row .pr .v{font-size:19px;font-weight:800}
.price-row .pr .v small{font-size:12px;color:var(--txt-dim);font-weight:500}
.caps{display:flex;gap:7px;flex-wrap:wrap}
.caps span{font-size:11.5px;padding:3px 9px;border-radius:7px;background:var(--surface2);border:1px solid var(--border);color:var(--txt-dim)}
.mc-foot{margin-top:14px;padding-top:13px;border-top:1px solid var(--border);font-size:12px;color:var(--txt-faint);display:flex;justify-content:space-between}

/* ---------- 文档页 ---------- */
.doc{display:grid;grid-template-columns:240px 1fr;gap:42px;padding:40px 0 80px;align-items:start}
.sidebar{position:sticky;top:90px;display:flex;flex-direction:column;gap:4px}
.sidebar .sg{font-size:11.5px;text-transform:uppercase;letter-spacing:1.5px;color:var(--txt-faint);margin:18px 0 6px}
.sidebar a{padding:8px 13px;border-radius:9px;font-size:14px;color:var(--txt-dim);transition:.18s;border-left:2px solid transparent}
.sidebar a:hover{background:var(--surface);color:var(--txt)}
.sidebar a.active{color:var(--txt);border-left-color:var(--cyan);background:var(--surface)}
.doc-main{max-width:760px}
.doc-main h1{font-size:32px;font-weight:800;margin-bottom:10px}
.doc-main h2{font-size:23px;font-weight:750;margin:38px 0 14px;padding-top:10px}
.doc-main h3{font-size:17px;font-weight:700;margin:24px 0 10px;color:var(--txt)}
.doc-main p{color:var(--txt-dim);margin-bottom:14px;font-size:15px}
.doc-main ul{color:var(--txt-dim);margin:0 0 14px 20px;font-size:14.5px}
.doc-main li{margin-bottom:7px}
.note{background:var(--grad-soft);border:1px solid var(--border-glow);border-radius:11px;padding:14px 17px;font-size:14px;color:var(--txt);margin:16px 0}
.note b{color:var(--cyan)}

/* 代码块 */
.code-tabs{display:flex;gap:6px;margin:18px 0 0}
.code-tabs .tab{padding:7px 15px;font-size:13px;border-radius:9px 9px 0 0;background:var(--surface);border:1px solid var(--border);border-bottom:none;color:var(--txt-faint);cursor:pointer}
.code-tabs .tab.active{background:rgba(8,11,22,.95);color:var(--txt);border-color:var(--border-glow)}
.code-block{position:relative;background:rgba(8,11,22,.95);border:1px solid var(--border);border-radius:0 12px 12px 12px;overflow:hidden;margin-bottom:8px}
.code-block pre{padding:18px 20px;overflow-x:auto;font-family:'JetBrains Mono',ui-monospace,Menlo,monospace;font-size:13px;line-height:1.7;color:var(--txt)}
.code-block[data-lang="curl"] .k{color:var(--cyan)}
.copy{position:absolute;top:11px;right:11px;background:var(--surface2);border:1px solid var(--border);color:var(--txt-dim);
  font-size:12px;padding:5px 11px;border-radius:8px;cursor:pointer;transition:.18s}
.copy:hover{color:var(--txt);border-color:var(--border-glow)}
.copy.done{color:var(--green);border-color:var(--green)}

/* 参数表 */
.ptable{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px}
.ptable th,.ptable td{text-align:left;padding:11px 13px;border-bottom:1px solid var(--border)}
.ptable th{color:var(--txt-faint);font-weight:600;font-size:12.5px;text-transform:uppercase;letter-spacing:.5px}
.ptable td code{background:var(--surface2);padding:2px 7px;border-radius:6px;font-size:12.5px;color:var(--cyan)}
.ptable tr:hover td{background:var(--surface)}

/* 错误码 */
.err{display:flex;gap:14px;align-items:center;padding:13px 16px;border:1px solid var(--border);border-radius:11px;margin-bottom:10px;background:var(--surface)}
.err .code{font-family:monospace;font-weight:700;padding:3px 9px;border-radius:7px;font-size:13px}
.err .c401{background:rgba(251,191,36,.15);color:#fbbf24}
.err .c429{background:rgba(244,114,182,.15);color:#f472b6}
.err .c5{background:rgba(248,113,113,.15);color:#f87171}
.err .ct{color:var(--txt-dim);font-size:13.5px}

/* ---------- 表单页（登录/控制台）---------- */
.auth-wrap{max-width:440px;margin:70px auto;padding:0 20px}
.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:34px;box-shadow:0 30px 80px rgba(0,0,0,.4)}
.auth-card h2{font-size:24px;font-weight:800;text-align:center;margin-bottom:6px}
.auth-card .asub{text-align:center;color:var(--txt-dim);font-size:14px;margin-bottom:26px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--txt-dim);margin-bottom:7px}
.field input{width:100%;padding:12px 14px;border-radius:11px;background:rgba(8,11,22,.7);
  border:1px solid var(--border);color:var(--txt);font-size:14.5px;outline:none;transition:.2s}
.field input:focus{border-color:var(--border-glow);box-shadow:0 0 0 3px rgba(34,211,238,.12)}
.seg{display:flex;background:var(--surface);border:1px solid var(--border);border-radius:11px;padding:4px;margin-bottom:22px}
.seg button{flex:1;padding:10px;border:none;background:none;color:var(--txt-dim);font-size:14px;font-weight:600;border-radius:8px;cursor:pointer;transition:.2s}
.seg button.active{background:var(--grad-soft);color:var(--txt)}
.key-box{margin:8px 0 18px;padding:13px 15px;background:rgba(8,11,22,.7);border:1px dashed var(--border-glow);border-radius:11px;
  font-family:monospace;font-size:13px;word-break:break-all;display:flex;justify-content:space-between;align-items:center;gap:10px}
.key-box .kk{color:var(--cyan)}
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0}
.stat{background:var(--surface);border:1px solid var(--border);border-radius:13px;padding:18px}
.stat .v{font-size:24px;font-weight:800}.stat .l{font-size:12.5px;color:var(--txt-dim);margin-top:4px}
.usage-list{margin-top:8px}
.usage-row{display:flex;justify-content:space-between;padding:11px 0;border-bottom:1px solid var(--border);font-size:14px}
.usage-row .m{color:var(--txt)}.usage-row .c{color:var(--green);font-family:monospace}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:13px;margin-bottom:12px;background:var(--surface);overflow:hidden}
.faq-q{padding:18px 20px;font-weight:650;font-size:15.5px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:14px}
.faq-q .pm{color:var(--cyan);font-size:20px;transition:.2s}
.faq-item.open .faq-q .pm{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:.3s;color:var(--txt-dim);font-size:14px}
.faq-item.open .faq-a{max-height:240px}
.faq-a p{padding:0 20px 18px}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--border);padding:46px 0 36px;margin-top:40px;background:rgba(5,7,15,.6)}
.footer-in{display:flex;justify-content:space-between;flex-wrap:wrap;gap:26px}
.footer .col h4{font-size:14px;margin-bottom:13px;color:var(--txt)}
.footer .col a{display:block;color:var(--txt-dim);font-size:13.5px;margin-bottom:9px;transition:.18s}
.footer .col a:hover{color:var(--txt)}
.footer .copy{margin-top:34px;padding-top:22px;border-top:1px solid var(--border);color:var(--txt-faint);font-size:13px;text-align:center}

/* ---------- 响应式 ---------- */
@media(max-width:860px){
  .nav-links{display:none}
  .menu-btn{display:block}
  .nav-links.open{display:flex;position:absolute;top:66px;left:0;right:0;flex-direction:column;
    background:rgba(5,7,15,.97);padding:18px 22px;gap:16px;border-bottom:1px solid var(--border)}
  .grid-3,.grid-4{grid-template-columns:1fr}
  .doc{grid-template-columns:1fr}
  .sidebar{position:static;flex-direction:row;flex-wrap:wrap;gap:6px;margin-bottom:20px}
  .sidebar .sg{width:100%}
  .stat-grid{grid-template-columns:1fr}
}