:root{
  --teal:#0D9F8A;
  --teal-dark:#0B8A78;
  --teal-deep:#07685B;
  --tint:#E7F7F4;
  --tint-2:#F3FBFA;
  --bg:#F5F8F7;
  --card:#FFFFFF;
  --ink:#16302C;
  --muted:#5B6F6C;
  --line:#D5E4E0;
  --line-soft:#E6EEEC;
  --warn:#C4841A;
  --warn-bg:#FFF6E5;
  --ok:#0D9F8A;
  --bad:#D4504A;
  --shadow:0 10px 30px rgba(13,80,70,.08);
  --radius:16px;
  --font:"Noto Sans CJK SC","Source Han Sans SC","Microsoft YaHei","PingFang SC",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 var(--font)}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
img{max-width:100%;display:block}
h1,h2,h3,p{margin:0}
.container{width:min(1120px,calc(100% - 48px));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(245,248,247,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--line-soft)}
.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;letter-spacing:.02em}
.brand img{width:36px;height:36px;border-radius:10px}
.brand small{display:block;font-size:11px;color:var(--muted);font-weight:500;letter-spacing:.04em}
.nav-links{display:flex;align-items:center;gap:8px}
.nav-links a{padding:8px 12px;border-radius:10px;color:var(--muted);font-size:14px}
.nav-links a:hover,.nav-links a.is-on{color:var(--teal-deep);background:var(--tint)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:12px 20px;font-weight:650;cursor:pointer}
.btn-primary{background:var(--teal);color:#fff;box-shadow:0 8px 20px rgba(13,159,138,.25)}
.btn-primary:hover{background:var(--teal-dark)}
.btn-ghost{background:#fff;color:var(--teal-deep);border:1px solid var(--line)}
.btn-lg{padding:14px 24px;font-size:16px;min-height:48px}
.hero{padding:56px 0 36px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--tint);color:var(--teal-deep);border-radius:999px;padding:4px 12px;font-size:13px;font-weight:650}
.hero h1{font-size:42px;line-height:1.25;letter-spacing:-.02em;margin:16px 0 12px;font-weight:800}
.hero h1 em{font-style:normal;color:var(--teal)}
.lead{color:var(--muted);font-size:17px;max-width:36em}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.meta{margin-top:14px;color:var(--muted);font-size:13px}
.app-frame{background:linear-gradient(180deg,#fff,var(--tint-2));border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden}
.app-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid var(--line-soft);background:#fff}
.app-bar .dot{width:8px;height:8px;border-radius:50%;background:#D5E4E0}
.app-bar b{font-size:13px;margin-left:6px}
.app-body{display:grid;grid-template-columns:148px 1fr;min-height:320px}
.side{background:#fff;border-right:1px solid var(--line-soft);padding:14px 10px;display:flex;flex-direction:column;gap:6px}
.side .step{border-radius:10px;padding:10px 12px;font-size:14px;color:var(--muted)}
.side .step.on{background:var(--tint);color:var(--teal-deep);font-weight:700}
.panel{padding:18px 20px}
.kv{display:grid;grid-template-columns:88px 1fr;gap:8px 12px;font-size:13px;margin-bottom:16px}
.kv span{color:var(--muted)}
.kv b{font-weight:650}
.pills{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.pill{background:#fff;border:1px solid var(--line-soft);border-radius:10px;padding:8px 10px;font-size:12px}
.pill strong{display:block;color:var(--teal-deep)}
.section{padding:64px 0}
.section h2{font-size:32px;line-height:1.3;font-weight:800;letter-spacing:-.02em}
.section h2 em{font-style:normal;color:var(--teal)}
.section .intro{margin:10px 0 32px;color:var(--muted);max-width:40em}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:var(--card);border:1px solid var(--line-soft);border-radius:var(--radius);padding:22px 22px 20px;box-shadow:0 6px 18px rgba(13,80,70,.04)}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14px}
.icon-dot{width:36px;height:36px;border-radius:10px;background:var(--tint);color:var(--teal-deep);display:flex;align-items:center;justify-content:center;font-weight:800;margin-bottom:14px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.step-card{background:var(--card);border:1px solid var(--line-soft);border-radius:var(--radius);padding:24px;position:relative}
.step-card .n{font-size:12px;font-weight:700;color:var(--teal);letter-spacing:.08em}
.step-card h3{margin:8px 0}
.step-card p{color:var(--muted);font-size:14px}
.query-band{background:linear-gradient(180deg,var(--tint-2),#fff);border:1px solid var(--line);border-radius:24px;padding:36px;display:grid;grid-template-columns:1fr 1.1fr;gap:28px;align-items:center;box-shadow:var(--shadow)}
.query-box{display:flex;gap:10px}
.query-box input{flex:1;height:48px;border:1px solid var(--line);border-radius:12px;padding:0 14px;background:#fff;color:var(--ink)}
.query-box input:focus{outline:2px solid rgba(13,159,138,.35);border-color:var(--teal)}
.faq details{background:#fff;border:1px solid var(--line-soft);border-radius:12px;padding:14px 18px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:650}
.faq p{color:var(--muted);margin-top:8px;font-size:14px}
.download{background:#fff;border:1px solid var(--line);border-radius:24px;padding:32px;display:flex;justify-content:space-between;align-items:center;gap:24px;box-shadow:var(--shadow)}
.foot{padding:28px 0 40px;color:var(--muted);font-size:13px;border-top:1px solid var(--line-soft);margin-top:24px}
.foot .row{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.foot a:hover{color:var(--teal-deep)}
/* query page */
.query-hero{padding:48px 0 12px;text-align:center}
.query-hero h1{font-size:36px;font-weight:800;margin:12px 0 8px}
.query-panel{max-width:720px;margin:24px auto 0;background:#fff;border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:var(--shadow)}
.query-panel label{display:block;font-weight:650;margin-bottom:8px}
.hint{color:var(--muted);font-size:13px;margin-top:10px}
.result{margin:28px auto 0;max-width:880px;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);overflow:hidden}
.result-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;padding:24px 28px;border-bottom:1px solid var(--line-soft)}
.badge{display:inline-flex;align-items:center;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:700}
.badge-ok{background:var(--tint);color:var(--teal-deep)}
.badge-watch{background:var(--warn-bg);color:var(--warn)}
.demo{font-size:12px;color:var(--muted);background:var(--bg);border-radius:999px;padding:3px 8px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:12px 24px;padding:22px 28px}
.item{border:1px solid var(--line-soft);border-radius:12px;padding:12px 14px}
.item .k{font-size:12px;color:var(--muted)}
.item .v{font-weight:700}
.checks{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;padding:0 28px 24px}
.check{border:1px solid var(--line-soft);border-radius:12px;padding:12px;font-size:13px}
.check b{display:block;margin-bottom:4px}
.st-ok{color:var(--ok)}
.st-na{color:var(--muted)}
.st-bad{color:var(--bad)}
.note{padding:0 28px 24px;color:var(--muted);font-size:13px}
@media (max-width:880px){
  .hero-grid,.app-body,.cards,.steps,.query-band,.download,.grid-2,.checks{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .nav-links{display:none}
}

/* production helpers for live query results */
.result-empty,.result-error{margin:28px auto 0;max-width:720px;background:#fff;border:1px solid var(--line);border-radius:24px;padding:28px;box-shadow:var(--shadow);text-align:center}
.result-empty h2,.result-error h2{font-size:22px;margin-bottom:8px}
.result-empty p,.result-error p{color:var(--muted)}
.result-loading{margin:28px auto 0;max-width:720px;text-align:center;color:var(--muted)}
.badge-bad{background:#FDECEC;color:var(--bad)}
.badge-na{background:var(--bg);color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.query-box button[disabled]{opacity:.65;cursor:wait}