:root {
  --bg: #fbf9f4;
  --panel: #ffffff;
  --ink: #1d1b19;
  --muted: #6a645c;
  --line: #e4ded3;
  --accent: #b5471f;
  --accent-ink: #ffffff;
  --good: #1f7a4a;
  --warn: #a86a00;
  --bad: #b3261e;
  --check-a: #ffffff;
  --check-b: #e6e1d8;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171513;
    --panel: #211e1b;
    --ink: #f1ece4;
    --muted: #a39b8f;
    --line: #363029;
    --accent: #e0703f;
    --accent-ink: #1a0f08;
    --good: #5ccf93;
    --warn: #e8b04a;
    --bad: #ff8a80;
    --check-a: #2b2825;
    --check-b: #36322e;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }

header.site { border-bottom: 1px solid var(--line); background: var(--panel); }
header.site .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 22px; padding-top: 12px; padding-bottom: 12px; }
header.site .brand { font-weight: 800; font-size: 1.1rem; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
header.site nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
header.site nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
header.site nav a:hover, header.site nav a[aria-current] { color: var(--accent); }

main { padding: 28px 0 40px; }
h1 { font-size: clamp(1.7rem, 4vw, 2.3rem); line-height: 1.2; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 1.35rem; line-height: 1.3; margin: 2rem 0 0.5rem; }
h3 { font-size: 1.1rem; margin: 1.4rem 0 0.3rem; }
.lede { color: var(--muted); font-size: 1.1rem; margin: 0 0 20px; }
.prose p, .prose li { max-width: 68ch; }
.prose table { border-collapse: collapse; margin: 12px 0; font-size: 0.95rem; width: 100%; max-width: 560px; }
.prose th, .prose td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; }
.prose th { background: var(--panel); }
code { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; font-size: 0.92em; }

.tool { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin: 18px 0; }
.drop {
  display: block; border: 2px dashed var(--line); border-radius: var(--radius); padding: 28px 16px;
  text-align: center; cursor: pointer; color: var(--muted);
}
.drop.over, .drop:hover { border-color: var(--accent); color: var(--ink); }
.drop strong { color: var(--ink); }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.drop:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }

.controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px 20px; margin: 16px 0; align-items: end; }
.controls label { display: block; font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.controls .hint { font-weight: 400; color: var(--muted); }
.controls input[type=range] { width: 100%; }
.controls input[type=number], .controls select {
  width: 100%; padding: 8px 10px; font: inherit; background: var(--bg); color: var(--ink);
  border: 1px solid var(--line); border-radius: 8px;
}
.controls input[type=color] { width: 100%; height: 40px; padding: 2px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); }
.check { display: flex; gap: 8px; align-items: center; font-weight: 500; }
.check input { width: 18px; height: 18px; }

.preview { border: 1px solid var(--line); border-radius: 8px; overflow: auto; max-height: 70vh; text-align: center;
  background-image: linear-gradient(45deg, var(--check-b) 25%, transparent 25%, transparent 75%, var(--check-b) 75%),
                    linear-gradient(45deg, var(--check-b) 25%, var(--check-a) 25%, var(--check-a) 75%, var(--check-b) 75%);
  background-size: 20px 20px; background-position: 0 0, 10px 10px; }
.preview canvas { max-width: 100%; height: auto; display: block; margin: 0 auto; cursor: crosshair; }
.status { color: var(--muted); font-size: 0.92rem; margin: 10px 0; min-height: 1.4em; }

button, .btn {
  font: inherit; font-weight: 700; padding: 10px 18px; border-radius: 8px; border: 0; cursor: pointer;
  background: var(--accent); color: var(--accent-ink);
}
button:disabled { opacity: 0.45; cursor: not-allowed; }
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.results { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 12px; margin-top: 8px; }
.stat { border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; background: var(--bg); }
.stat .k { font-size: 0.82rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.stat .v { font-size: 1.25rem; font-weight: 750; }
.stat .s { font-size: 0.9rem; color: var(--muted); }
.result { border: 1px solid var(--line); border-left-width: 6px; border-radius: 8px; padding: 12px 16px; margin-top: 14px; background: var(--bg); }
.result.good { border-left-color: var(--good); }
.result.marginal { border-left-color: var(--warn); }
.result.low { border-left-color: var(--bad); }
.result .verdict { font-weight: 750; }
ul.notes { margin: 10px 0 0; padding-left: 20px; color: var(--muted); font-size: 0.95rem; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 20px 0; }
.card { display: block; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; text-decoration: none; color: var(--ink); }
.card:hover { border-color: var(--accent); }
.card h3 { margin: 0 0 4px; color: var(--accent); }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; line-height: 1.5; }

.ad-slot { margin: 22px auto; text-align: center; }
details { border-top: 1px solid var(--line); padding: 10px 0; }
details summary { cursor: pointer; font-weight: 650; }
details p { margin: 8px 0 2px; }

footer.site { border-top: 1px solid var(--line); background: var(--panel); padding: 22px 0; color: var(--muted); font-size: 0.92rem; }
footer.site .links { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 8px; }
footer.site a { color: var(--muted); }
[hidden] { display: none !important; }