:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --ink: #16202e;
  --ink-2: #4a5568;
  --muted: #7a8699;
  --line: #e2e6ec;
  --brand: #1a2b4a;
  --brand-ink: #ffffff;
  --accent: #2f6fdb;
  --good: #1f8a4c;
  --warn: #b7791f;
  --bad: #c53030;
  --good-bg: #e7f5ec;
  --warn-bg: #fdf3e1;
  --bad-bg: #fdeaea;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141b;
    --surface: #171e28;
    --ink: #e8edf4;
    --ink-2: #b4bfcd;
    --muted: #8593a6;
    --line: #283243;
    --brand: #8fb3ff;
    --brand-ink: #0f141b;
    --accent: #8fb3ff;
    --good: #5cc98a;
    --warn: #e3b456;
    --bad: #f07878;
    --good-bg: #16301f;
    --warn-bg: #33280f;
    --bad-bg: #3a1717;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h2 { font-size: 22px; }
h3 { font-size: 16px; }
a { color: var(--accent); }
code, pre, textarea.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
.muted { color: var(--muted); }
.error { color: var(--bad); min-height: 1.2em; }
[hidden] { display: none !important; }

.topbar {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 10px 20px; background: var(--surface); border-bottom: 1px solid var(--line);
}
.brand { font-weight: 800; letter-spacing: .02em; }
.brand span { font-weight: 500; color: var(--muted); }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; }
.tabs button {
  white-space: nowrap;
  border: 0; background: none; color: var(--ink-2); padding: 8px 12px; border-radius: 8px; cursor: pointer; font: inherit;
}
.tabs button:hover { background: var(--bg); }
.tabs button.active { background: var(--brand); color: var(--brand-ink); }
.theme-pick { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }

main { max-width: 1180px; margin: 0 auto; padding: 24px 16px 64px; }
.banner { background: var(--warn-bg); color: var(--ink); padding: 10px 20px; font-size: 14px; border-bottom: 1px solid var(--line); }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.stack { display: grid; gap: 16px; }
.grid-2 { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }
.intro { color: var(--ink-2); max-width: 75ch; margin-top: 0; }

input[type="text"], input[type="url"], input[type="password"], select, textarea {
  font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 9px 11px; min-width: 0;
}
textarea { width: 100%; resize: vertical; }
input.grow { flex: 1; min-width: 220px; }
label { display: grid; gap: 6px; font-size: 14px; color: var(--ink-2); }
label.inline { display: inline-flex; align-items: center; gap: 6px; }

.btn {
  font: inherit; border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  padding: 9px 14px; border-radius: 8px; cursor: pointer; white-space: nowrap;
}
.btn:hover { border-color: var(--muted); }
.btn-primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { opacity: .9; }
.btn[disabled] { opacity: .5; cursor: progress; }
.btn-sm { padding: 5px 10px; font-size: 13px; }

.pill { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 999px; background: var(--bg); color: var(--ink-2); border: 1px solid var(--line); }
.pill.good { background: var(--good-bg); color: var(--good); border-color: transparent; }
.pill.warn { background: var(--warn-bg); color: var(--warn); border-color: transparent; }
.pill.bad { background: var(--bad-bg); color: var(--bad); border-color: transparent; }

/* Blocks */
.block-card ul { margin: 8px 0 0; padding-left: 18px; color: var(--ink-2); font-size: 14px; }
.block-card li { margin: 2px 0; }

/* Checkup */
.scores { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.score { display: flex; gap: 16px; align-items: center; }
.score-num { font-size: 44px; font-weight: 800; line-height: 1; }
.score-num.good { color: var(--good); } .score-num.warn { color: var(--warn); } .score-num.bad { color: var(--bad); }
.checks { width: 100%; border-collapse: collapse; font-size: 14px; }
.checks td { padding: 8px 6px; border-top: 1px solid var(--line); vertical-align: top; }
.checks td:first-child { width: 78px; }
.checks .fix { color: var(--muted); font-size: 13px; }
.fix-item { border-top: 1px solid var(--line); padding: 12px 0; }
.fix-item:first-child { border-top: 0; padding-top: 0; }
.fix-item p { margin: 4px 0; }
details summary { cursor: pointer; }
.qa { margin: 0 0 12px; }
.qa b { display: block; }

/* Builder */
.section-list { list-style: none; margin: 0; padding: 0; counter-reset: s; }
.section-list li { counter-increment: s; padding: 10px 0; border-top: 1px solid var(--line); }
.section-list li:first-child { border-top: 0; }
.section-list li::before { content: counter(s) "."; color: var(--muted); margin-right: 8px; }
.warnings { color: var(--warn); font-size: 14px; padding-left: 18px; }
pre.json { background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 12px; overflow: auto; max-height: 420px; }

/* Analytics */
.tiles { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.tile .label { font-size: 13px; color: var(--muted); }
.tile .value { font-size: 28px; font-weight: 700; }
.chart { position: relative; }
.chart svg { width: 100%; height: 220px; display: block; }
.chart .bar { fill: var(--brand); }
.chart .bar-hit:hover + .bar, .chart .bar.hover { opacity: .75; }
.chart .axis { stroke: var(--line); }
.chart text { fill: var(--muted); font-size: 11px; }
.tip {
  position: absolute; pointer-events: none; background: var(--ink); color: var(--surface);
  font-size: 12px; padding: 6px 8px; border-radius: 6px; white-space: nowrap; transform: translate(-50%, -110%);
}
table.data { width: 100%; border-collapse: collapse; font-size: 14px; }
table.data th { text-align: left; color: var(--muted); font-weight: 500; font-size: 13px; padding: 6px; }
table.data td { padding: 7px 6px; border-top: 1px solid var(--line); }
table.data td.num, table.data th.num { text-align: right; font-variant-numeric: tabular-nums; }
.table-wrap { overflow-x: auto; }

.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: min(360px, 100%); display: grid; gap: 14px; }
.login-card h1 { margin: 0; font-size: 22px; }
.login-card p { margin: 0; }

.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 10;
  background: var(--ink); color: var(--surface); padding: 10px 16px; border-radius: 8px; max-width: min(560px, calc(100% - 32px));
}
.spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -2px; }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 700px) {
  .topbar { padding: 10px 16px; }
  .tabs { order: 3; flex: 1 0 100%; flex-wrap: nowrap; overflow-x: auto; }
  .theme-pick { width: 100%; }
  .theme-pick select { flex: 1; }
}