:root{
  --bg:#f7fafc; --fg:#0f172a; --muted:#64748b;
  --card:#fff; --border:#e2e8f0; --pill-ok:#e6f9ed; --pill-ok-fg:#10633c;
  --pill-warn:#fff7e6; --pill-warn-fg:#7a4d00; --pill-bad:#fdecec; --pill-bad-fg:#8a1f1f;
  --accent:#0ea5a4; --accent-600:#0f766e; --btn:#0f172a; --btn-fg:#fff;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.4 system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, sans-serif}
a{color:var(--accent-600);text-decoration:none} a:hover{text-decoration:underline}
.muted{color:var(--muted)}
header.app-header{position:sticky;top:0;z-index:10;background:#fff;border-bottom:1px solid var(--border);display:flex;gap:16px;align-items:center;justify-content:space-between;padding:12px 16px}
.brand{font-weight:700}
.top-links a{margin-left:12px}

.status-bar{max-width:1100px;margin:12px auto 0;display:flex;gap:8px;flex-wrap:wrap; padding:0 12px}
.pill{padding:.25rem .55rem;border-radius:9999px;font-size:.8rem;border:1px solid var(--border)}
.pill.ok{background:var(--pill-ok);color:var(--pill-ok-fg)}
.pill.warn{background:var(--pill-warn);color:var(--pill-warn-fg)}
.pill.bad{background:var(--pill-bad);color:var(--pill-bad-fg)}

.tabs{max-width:1100px;margin:8px auto 0;display:flex;gap:4px;border-bottom:1px solid var(--border);padding:0 12px}
.tab{background:transparent;border:none;padding:10px 12px;margin:0;font:inherit;border-bottom:2px solid transparent;cursor:pointer}
.tab.active{border-color:var(--accent-600);font-weight:600}

main{max-width:1100px;margin:12px auto;padding:12px}
.panel{display:none} .panel.show{display:block}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:14px;margin:12px 0;box-shadow:0 6px 16px rgba(0,0,0,.04)}
.card-title{font-weight:700;margin-bottom:8px}

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}
.grid4{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:8px}
@media (max-width:900px){.grid2,.grid3,.grid4{grid-template-columns:1fr}}
input,select,textarea{width:100%;padding:10px;border:1px solid var(--border);border-radius:10px;background:#fff}
textarea{min-height:120px}
.btn{background:var(--btn);color:var(--btn-fg);border:none;border-radius:10px;padding:10px 14px;cursor:pointer}
.btn:hover{filter:brightness(.95)}
.btn.ghost{background:#fff;color:var(--fg);border:1px solid var(--border)}
.right{display:flex;justify-content:end}
.mt-8{margin-top:8px}

.pre{background:#f1f5f9;border:1px solid var(--border);border-radius:10px;padding:10px;overflow:auto}
.answer{background:#ecfeff;border:1px solid #99f6e4;border-radius:10px;padding:10px;margin-top:8px}
.list{display:grid;gap:8px}
.item{background:#fff;border:1px solid var(--border);border-radius:10px;padding:10px}
.footer{text-align:center;padding:24px;color:var(--muted)}
.bullets{margin:8px 0 0 16px}