:root {
  --bg: #f5f6f8; --panel: #ffffff; --ink: #14161a; --muted: #6b7280;
  --line: #e4e7ec; --accent: #e11d2a; --accent-ink: #ffffff;
  --ok: #128a3a; --bad: #c01527; --warn: #b45309; --flag: #b21f6b;
  --radius: 12px; --shadow: 0 1px 3px rgba(0,0,0,.06), 0 8px 24px rgba(0,0,0,.05);
  --mono: ui-monospace, "Cascadia Code", Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg:#0e0f12; --panel:#16181d; --ink:#e8eaed; --muted:#9aa1ac; --line:#262a31;
    --shadow: 0 1px 3px rgba(0,0,0,.4), 0 10px 30px rgba(0,0,0,.35); }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans);
  font-size: 15px; line-height: 1.5; display: flex; flex-direction: column; min-height: 100vh; }

/* Header */
.topbar { display:flex; align-items:center; justify-content:space-between; gap:16px;
  padding: 12px 22px; background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top:0; z-index: 10; }
.brand { display:flex; align-items:center; gap:12px; text-decoration:none; color:inherit; }
.brand-logo { height: 40px; width:auto; }
.brand-fallback { align-items:center; gap:10px; }
.bi-mark { font-weight:800; font-size:26px; letter-spacing:-2px; background:var(--ink); color:var(--panel);
  padding:2px 8px; border-radius:8px; }
.bi-mark i { font-style: normal; opacity:.85; }
.brand-name { font-weight:800; letter-spacing:.5px; }
.brand-name small { display:block; font-weight:600; color:var(--muted); letter-spacing:2px; font-size:10px; }
.nav { display:flex; gap:6px; align-items:center; flex-wrap:wrap; }
.nav a { text-decoration:none; color:var(--muted); padding:7px 12px; border-radius:8px; font-weight:600; font-size:14px; }
.nav a:hover { background: var(--bg); color: var(--ink); }
.nav a.active { color: var(--ink); background: var(--bg); }
.nav .who { color:var(--muted); font-size:13px; margin-left:6px; }

/* Layout */
.app { flex:1; width:100%; max-width: 1080px; margin: 0 auto; padding: 26px 22px 60px; }
.footer { display:flex; align-items:center; gap:14px; justify-content:center; flex-wrap:wrap;
  padding:16px; border-top:1px solid var(--line); color:var(--muted); font-size:13px; background:var(--panel); }
.amber-logo { height: 22px; }
.muted { color: var(--muted); }

/* Cards & grid */
.card { background:var(--panel); border:1px solid var(--line); border-radius:var(--radius);
  box-shadow: var(--shadow); padding:20px; margin-bottom:18px; }
.grid { display:grid; gap:16px; }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width:760px){ .grid.cols-4{grid-template-columns:repeat(2,1fr)} .grid.cols-2{grid-template-columns:1fr} }
h1 { font-size: 22px; margin: 0 0 4px; }
h2 { font-size: 17px; margin: 0 0 12px; }
.sub { color:var(--muted); margin: 0 0 22px; }

/* Stat tiles */
.stat { text-align:left; }
.stat .n { font-size: 30px; font-weight: 800; letter-spacing:-1px; }
.stat .l { color: var(--muted); font-size: 13px; font-weight:600; text-transform:uppercase; letter-spacing:.5px; }
.stat.flag .n { color: var(--flag); }

/* Buttons & inputs */
button, .btn { font: inherit; font-weight:700; cursor:pointer; border:1px solid var(--line);
  background: var(--panel); color: var(--ink); padding:10px 16px; border-radius:9px; text-decoration:none; display:inline-flex; align-items:center; gap:8px; }
button:hover, .btn:hover { border-color: var(--muted); }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-primary:hover { filter: brightness(1.05); border-color: var(--accent); }
.btn-dark { background: var(--ink); color: var(--panel); border-color: var(--ink); }
button:disabled { opacity:.5; cursor:not-allowed; }
input, select { font: inherit; padding:10px 12px; border:1px solid var(--line); border-radius:9px;
  background: var(--panel); color: var(--ink); width:100%; }
label { display:block; font-weight:600; font-size:13px; margin: 12px 0 6px; }
.row { display:flex; gap:12px; flex-wrap:wrap; align-items:flex-end; }
.row > div { flex:1; min-width: 180px; }

/* Tables */
table { width:100%; border-collapse: collapse; font-size:14px; }
.table-wrap { overflow-x:auto; }
th, td { text-align:left; padding:10px 12px; border-bottom:1px solid var(--line); white-space:nowrap; }
th { color:var(--muted); font-size:12px; text-transform:uppercase; letter-spacing:.4px; }
tbody tr:hover { background: var(--bg); cursor: default; }
tr.clickable { cursor:pointer; }

/* Badges */
.badge { display:inline-block; padding:3px 9px; border-radius:999px; font-size:12px; font-weight:700; }
.badge.pass { background: color-mix(in srgb, var(--ok) 15%, transparent); color: var(--ok); }
.badge.fail { background: color-mix(in srgb, var(--bad) 15%, transparent); color: var(--bad); }
.badge.ai { background: color-mix(in srgb, var(--flag) 15%, transparent); color: var(--flag); }
.badge.late { background: color-mix(in srgb, var(--warn) 15%, transparent); color: var(--warn); }
.badge.neutral { background: var(--bg); color: var(--muted); }
code, .mono { font-family: var(--mono); }

/* Timer */
.timer { font-family: var(--mono); font-size: 34px; font-weight:800; letter-spacing:1px; }
.timer.danger { color: var(--bad); }
.big-score { font-size: 56px; font-weight: 800; letter-spacing:-2px; }

/* Login */
.login-wrap { max-width: 420px; margin: 8vh auto; text-align:center; }
.login-wrap .card { padding: 30px; }
.hr { height:1px; background:var(--line); margin:18px 0; }
.evidence { background: color-mix(in srgb, var(--flag) 8%, transparent); border:1px solid color-mix(in srgb, var(--flag) 30%, transparent);
  border-radius:10px; padding:14px 16px; }
.evidence li { margin: 6px 0; }
.toast { position:fixed; bottom:20px; left:50%; transform:translateX(-50%); background:var(--ink); color:var(--panel);
  padding:12px 18px; border-radius:10px; box-shadow:var(--shadow); z-index:50; }
ul.clean { list-style:none; padding:0; margin:0; }
.kv { display:flex; justify-content:space-between; padding:6px 0; border-bottom:1px dashed var(--line); }
.kv .k { color: var(--muted); }