:root {
  --bg: #fafaf8; --fg: #1d2530; --muted: #5b6573; --card: #ffffff; --border: #d9dde3;
  --accent: #1f5f8b; --accent-fg: #ffffff; --ok: #1b7a43; --ok-bg: #e7f5ec;
  --warn: #8a5a00; --warn-bg: #fff4d6; --bad: #a12626; --bad-bg: #fdeaea; --info-bg: #eaf1f8;
  --radius: 10px; --ctl-border: #6b7685; /* >= 3:1 against bg and card (WCAG 1.4.11 non-text contrast) */
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161b; --fg: #e6e9ee; --muted: #9aa5b3; --card: #1a2028; --border: #2f3944;
    --accent: #6cb4e6; --accent-fg: #0b1117; --ok: #6fd69a; --ok-bg: #12301f;
    --warn: #f0c35c; --warn-bg: #352a0c; --bad: #ff8f8f; --bad-bg: #3a1717; --info-bg: #18283a; --ctl-border: #7d8896;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px 48px; }
header.site { padding: 20px 0 8px; }
header.site .brand { font-weight: 700; letter-spacing: .2px; text-decoration: none; color: var(--fg); }
header.site nav { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 6px; font-size: .92rem; }
h1 { font-size: 1.6rem; line-height: 1.25; margin: 14px 0 6px; }
h2 { font-size: 1.15rem; margin: 26px 0 8px; }
p.lead { color: var(--muted); margin-top: 0; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin: 14px 0; }
.privacy { background: var(--info-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 14px; font-size: .92rem; margin: 12px 0; }
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
label { display: block; font-weight: 600; font-size: .92rem; margin-bottom: 4px; }
.hint { font-weight: 400; color: var(--muted); font-size: .85rem; }
input, select, textarea { width: 100%; font: inherit; color: var(--fg); background: var(--bg); border: 1px solid var(--ctl-border); border-radius: 8px; padding: 9px 10px; min-height: 42px; }
textarea { min-height: 150px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92rem; }
input:focus, select:focus, textarea:focus, button:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 1px; }
button { font: inherit; font-weight: 600; background: var(--accent); color: var(--accent-fg); border: 0; border-radius: 8px; padding: 10px 18px; min-height: 42px; cursor: pointer; }
button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
button:disabled { opacity: .55; cursor: not-allowed; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 12px; }
.check { display: flex; gap: 8px; align-items: center; font-weight: 400; }
.check input { width: auto; min-height: 0; }
.result { border-radius: var(--radius); padding: 12px 14px; margin: 12px 0; border: 1px solid var(--border); }
.result.ok { background: var(--ok-bg); border-color: var(--ok); }
.result.review { background: var(--warn-bg); border-color: var(--warn); }
.result.error { background: var(--bad-bg); border-color: var(--bad); }
.result h3 { margin: 0 0 4px; font-size: 1.05rem; }
.result ul { margin: 6px 0 0 1.1rem; padding: 0; }
.tag { display: inline-block; font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .4px; padding: 1px 7px; border-radius: 999px; border: 1px solid currentColor; margin-right: 6px; }
.tag.review { color: var(--warn); } .tag.info, .tag.style { color: var(--accent); } .tag.ok { color: var(--ok); } .tag.error { color: var(--bad); }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); vertical-align: top; word-break: break-word; }
.table-scroll { overflow-x: auto; }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92em; }
.tools { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); padding: 0; list-style: none; }
.tools a.tool { display: block; height: 100%; text-decoration: none; color: inherit; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; }
.tools a.tool:hover { border-color: var(--accent); }
.tools strong { color: var(--accent); display: block; margin-bottom: 4px; }
footer.site { margin-top: 36px; padding-top: 14px; border-top: 1px solid var(--border); font-size: .85rem; color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
@media (max-width: 480px) { h1 { font-size: 1.35rem; } .card { padding: 12px; } }