:root {
  --bg: #faf6ef;
  --card: #ffffff;
  --ink: #211c17;
  --muted: #6d645a;
  --line: #e6ded2;
  --accent: #c2362b;
  --accent-ink: #ffffff;
  --accent-soft: #fbe9e6;
  --good: #25724a;
  --good-soft: #e3f3ea;
  --radius: 14px;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --zh: "PingFang SC", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17140f;
    --card: #211d17;
    --ink: #f1eadf;
    --muted: #a69c8f;
    --line: #383127;
    --accent: #e8695c;
    --accent-ink: #1a0f0d;
    --accent-soft: #40211d;
    --good: #6fc797;
    --good-soft: #1c3527;
  }
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); -webkit-text-size-adjust: 100%; }
main { max-width: 760px; margin: 0 auto; padding: 0 20px 48px; }
h1, h2, h3, p, ol, ul, fieldset { margin: 0; padding: 0; }
ol, ul { list-style: none; }
fieldset { border: 0; min-width: 0; }
button, textarea, input { font: inherit; color: inherit; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
[hidden] { display: none !important; }

.top { max-width: 760px; margin: 0 auto; padding: 18px 20px; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); text-decoration: none; }
.seal { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 7px; background: var(--accent); color: var(--accent-ink); font: 700 17px/1 var(--zh); }
.top-note { color: var(--muted); font-size: 14px; }

.hero { padding: 28px 0 24px; }
.hero h1 { font-size: clamp(28px, 6vw, 40px); line-height: 1.15; letter-spacing: -0.02em; }
.hero p { margin-top: 12px; color: var(--muted); font-size: 18px; max-width: 60ch; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card + .card, .result .card { margin-top: 16px; }
.card h3 { font-size: 17px; margin-bottom: 12px; }
.card-head { display: flex; justify-content: space-between; align-items: baseline; }

legend, .field label { font-weight: 600; font-size: 15px; }
.segmented { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.segmented label { position: relative; cursor: pointer; }
.segmented input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.segmented span { display: block; padding: 8px 16px; border: 1px solid var(--line); border-radius: 999px; font-weight: 600; font-size: 15px; }
.segmented input:checked + span { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.segmented input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.field { margin-top: 20px; }
.field-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; }
.field-foot { display: flex; justify-content: space-between; margin-top: 6px; color: var(--muted); font-size: 13px; }
textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); resize: vertical; }
textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
#text { font: 18px/1.8 var(--zh); min-height: 200px; }
.task { margin-top: 14px; }
.task summary { cursor: pointer; color: var(--muted); font-size: 15px; }
.task textarea { margin-top: 8px; font-family: var(--zh); }

.link { background: none; border: 0; padding: 0; color: var(--accent); font-weight: 600; font-size: 14px; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.actions { margin-top: 20px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.primary { background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 10px; padding: 12px 22px; font-weight: 700; font-size: 16px; cursor: pointer; }
.primary:hover { filter: brightness(1.06); }
.primary:disabled { opacity: 0.6; cursor: progress; }
.primary:focus-visible, .link:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
.status { color: var(--muted); font-size: 15px; min-height: 1.6em; }
.status.error { color: var(--accent); font-weight: 600; }

.result { margin-top: 28px; scroll-margin-top: 12px; }
.score { display: flex; align-items: center; gap: 18px; }
.score-num { font-size: 56px; font-weight: 800; line-height: 1; letter-spacing: -0.03em; color: var(--accent); }
.score-num small { font-size: 18px; font-weight: 600; color: var(--muted); letter-spacing: 0; }
.score-text { display: flex; flex-direction: column; }
.score-text strong { font-size: 20px; }
.score-text span { color: var(--muted); font-size: 14px; }
.summary { margin-top: 16px; }
.criteria { margin-top: 18px; display: grid; gap: 14px; border-top: 1px solid var(--line); padding-top: 18px; }
.crit-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.crit-name { font-weight: 600; }
.criteria p { color: var(--muted); font-size: 15px; }
.dots { display: inline-flex; gap: 5px; }
.dots i { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.dots i.on { background: var(--accent); }

.zh { font: 18px/1.9 var(--zh); white-space: pre-wrap; overflow-wrap: anywhere; }
.err { background: var(--accent-soft); color: inherit; text-decoration: underline wavy var(--accent); text-underline-offset: 4px; border-radius: 3px; padding: 1px 0; }
.err sup { font: 700 11px/1 var(--sans); color: var(--accent); margin-left: 1px; }
.hint { margin-top: 10px; color: var(--muted); font-size: 14px; }

.corrections { counter-reset: fix; display: grid; gap: 16px; }
.corrections li { counter-increment: fix; position: relative; padding-left: 34px; scroll-margin-top: 16px; }
.corrections li::before { content: counter(fix); position: absolute; left: 0; top: 5px; width: 22px; height: 22px; display: grid; place-items: center; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-size: 12px; font-weight: 700; }
.corrections li:target { outline: 2px solid var(--accent); outline-offset: 8px; border-radius: 6px; }
.change { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; white-space: normal; }
.change del { color: var(--accent); text-decoration-thickness: 1.5px; }
.change .remove { color: var(--muted); font-family: system-ui, sans-serif; font-size: 14px; }
.change ins { color: var(--good); background: var(--good-soft); text-decoration: none; border-radius: 4px; padding: 0 5px; font-weight: 600; }
.arrow { color: var(--muted); font-family: var(--sans); }
.chip { display: inline-block; margin-top: 4px; padding: 1px 9px; border: 1px solid var(--line); border-radius: 999px; font-size: 12px; color: var(--muted); text-transform: capitalize; }
.why { color: var(--muted); font-size: 15px; margin-top: 4px; }
.upgrades { display: grid; gap: 14px; }
.steps { display: grid; gap: 8px; padding-left: 20px; list-style: disc; }
.disclaimer { margin-top: 18px; color: var(--muted); font-size: 14px; }

.info { margin-top: 48px; }
.info h2 { font-size: 22px; margin: 32px 0 14px; }
.how { display: grid; gap: 10px; padding-left: 22px; list-style: decimal; }
.info details { border-top: 1px solid var(--line); padding: 14px 0; }
.info details:last-of-type { border-bottom: 1px solid var(--line); }
.info summary { cursor: pointer; font-weight: 600; }
.info details p { margin-top: 8px; color: var(--muted); }

.foot { max-width: 760px; margin: 0 auto; padding: 24px 20px 40px; color: var(--muted); font-size: 13px; }

@media (max-width: 520px) {
  .card { padding: 18px; }
  .top-note { display: none; }
  .score-num { font-size: 46px; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }
.foot a, .info a { color: var(--accent); }

/* Guides */
.top a.top-note { color: var(--muted); }
.article .updated { font-size: 14px; margin-top: 8px; }
.article h2 { font-size: 22px; margin: 36px 0 12px; line-height: 1.3; }
.article h3 { font-size: 18px; margin: 24px 0 8px; }
.article p { margin-top: 12px; }
.article ul.list { margin-top: 12px; padding-left: 22px; list-style: disc; display: grid; gap: 6px; }
.article a { color: var(--accent); }
.ex { margin-top: 12px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; display: grid; gap: 4px; font-family: var(--zh); font-size: 17px; }
.ex .bad { color: var(--accent); }
.ex .bad::before { content: "✗ "; font-weight: 700; }
.ex .good { color: var(--good); }
.ex .good::before { content: "✓ "; font-weight: 700; }
.ex .note { color: var(--muted); font-family: var(--sans); font-size: 14px; }
.zh { font-family: var(--zh); }
.cta { margin-top: 40px; display: grid; gap: 14px; justify-items: start; }
.cta-button { display: inline-block; background: var(--accent); color: var(--accent-ink); font-weight: 700; text-decoration: none; padding: 11px 18px; border-radius: 10px; }
.more { margin-top: 32px; }
.more h2 { font-size: 18px; margin-bottom: 10px; }
.more ul, .guide-list { display: grid; gap: 10px; }
.more a, .guide-list a { color: var(--accent); }
.guide-list li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; }
.guide-list p { margin-top: 6px; color: var(--muted); }
.guide-links { display: grid; gap: 8px; padding-left: 22px; list-style: disc; }
.table-wrap { margin-top: 12px; overflow-x: auto; }
.article table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); font-size: 15px; }
.article th, .article td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.article th { font-weight: 700; }
.article td:nth-child(1), .article td:nth-child(3) { white-space: nowrap; }