:root {
  --desk: oklch(0.93 0.006 250);
  --paper: oklch(0.992 0.003 95);
  --ink: oklch(0.24 0.02 255);
  --ink-soft: oklch(0.45 0.015 255);
  --rule: oklch(0.84 0.01 255);
  --rule-strong: oklch(0.3 0.02 255);
  --accent: oklch(0.4 0.09 255);
  --bad: oklch(0.5 0.17 27);
  --bad-tint: color-mix(in oklch, var(--bad) 8%, var(--paper));
  --good: oklch(0.46 0.1 155);
  --good-tint: color-mix(in oklch, var(--good) 9%, var(--paper));
  --none: oklch(0.47 0.012 255);
  --none-tint: color-mix(in oklch, var(--none) 8%, var(--paper));
  --serif: "IBM Plex Serif", "Noto Serif SC", "Songti SC", serif;
  --sans: "IBM Plex Sans", -apple-system, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --doc-pad: clamp(20px, 5vw, 64px);
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--desk); color: var(--ink); font: 400 15px/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
::selection { background: color-mix(in oklch, var(--accent) 22%, transparent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
html[data-lang="zh"] [lang="en"], html[data-lang="en"] [lang="zh-Hans"] { display: none; }

.bar { position: sticky; inset-block-start: 0; z-index: 10; display: flex; align-items: center; gap: clamp(6px, 2vw, 16px); padding: 12px clamp(16px, 4vw, 40px); background: color-mix(in oklch, var(--desk) 88%, transparent); backdrop-filter: blur(8px); border-block-end: 1px solid var(--rule); }
.mark { display: inline-flex; align-items: baseline; gap: 8px; font: 600 18px/1 var(--serif); letter-spacing: -0.01em; color: var(--ink); text-decoration: none; }
.mark small { font: 400 12px/1 var(--sans); color: var(--ink-soft); letter-spacing: 0; }
.bar .spacer { flex: 1; }
.btn { display: inline-flex; align-items: center; gap: 6px; min-block-size: 36px; padding-inline: 14px; border: 1px solid var(--rule-strong); border-radius: 6px; background: transparent; color: var(--ink); font: 500 14px/1 var(--sans); text-decoration: none; cursor: pointer; }
.btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn:active { translate: 0 1px; }
.btn svg { inline-size: 16px; block-size: 16px; }
@media (hover: hover) and (pointer: fine) { .btn:hover { background: color-mix(in oklch, var(--ink) 6%, transparent); } .btn.primary:hover { background: color-mix(in oklch, var(--ink) 86%, var(--paper)); } }

.doc-wrap { padding: clamp(16px, 4vw, 48px) clamp(8px, 3vw, 32px) 120px; }
.doc { max-inline-size: 820px; margin-inline: auto; padding: var(--doc-pad); background: var(--paper); border-radius: 2px; box-shadow: 0 1px 2px oklch(0 0 0 / 6%), 0 12px 40px oklch(0 0 0 / 8%); font-family: var(--serif); }
.doc-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding-block-end: 14px; font: 400 12.5px/1.5 var(--sans); color: var(--ink-soft); }
.doc-head .id { font-family: var(--mono); color: var(--ink); }
.doc-title { padding-block: 22px 18px; border-block: 3px double var(--rule-strong); text-align: center; }
.doc-title h1 { font: 600 clamp(26px, 4.4vw, 36px)/1.25 var(--serif); letter-spacing: 0.03em; }
html[data-lang="en"] .doc-title h1 { letter-spacing: -0.01em; }
.doc-title p { margin-block-start: 6px; font: 400 13px/1.4 var(--sans); color: var(--ink-soft); letter-spacing: 0.02em; }

.sec { padding-block: 28px 4px; }
.sec h2 { display: flex; gap: 10px; align-items: baseline; margin-block-end: 14px; font: 600 17px/1.4 var(--serif); }
.sec h2 .n { color: var(--accent); font-variant-numeric: tabular-nums; }
.kv { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 0 24px; font-size: 15px; }
.kv dt, .kv dd { padding-block: 9px; border-block-end: 1px solid var(--rule); }
.kv dt { color: var(--ink-soft); font-family: var(--sans); font-size: 13.5px; }
.kv dd { overflow-wrap: anywhere; }
.mono { font-family: var(--mono); font-size: 13px; }

.verdict { padding: 22px clamp(16px, 3vw, 28px); border: 1px solid var(--rule-strong); outline: 1px solid var(--rule-strong); outline-offset: 3px; border-radius: 1px; }
.verdict .tag { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 3px; font: 600 12.5px/1.4 var(--sans); }
.verdict h3 { margin-block: 12px 8px; font: 600 clamp(24px, 3.6vw, 30px)/1.3 var(--serif); letter-spacing: 0.02em; text-wrap: balance; }
html[data-lang="en"] .verdict h3 { letter-spacing: -0.01em; }
.verdict p { max-inline-size: 62ch; color: var(--ink-soft); font-size: 15.5px; text-wrap: pretty; }
.verdict p strong { color: var(--ink); }
.v-bad .tag { background: var(--bad-tint); color: var(--bad); } .v-bad h3 { color: var(--bad); }
.v-good .tag { background: var(--good-tint); color: var(--good); } .v-good h3 { color: var(--good); }
.v-none .tag { background: var(--none-tint); color: var(--none); } .v-none h3 { color: var(--ink); }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); margin-block-start: 18px; border-block-start: 1px solid var(--rule); }
.facts div { padding: 12px 12px 0 0; }
.facts b { display: block; font: 600 26px/1.1 var(--serif); font-variant-numeric: tabular-nums lining-nums; }
.facts span { font: 400 12.5px/1.4 var(--sans); color: var(--ink-soft); }

.finding { padding-block: 18px; border-block-start: 1px solid var(--rule); }
.finding:last-of-type { border-block-end: 1px solid var(--rule); }
.finding header { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; }
.finding .no { font: 500 12.5px/1 var(--mono); color: var(--accent); }
.finding h3 { margin: 0; font: 600 17px/1.45 var(--serif); text-wrap: balance; }
.crops { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 340px)); gap: 14px; }
.crops figure { display: grid; gap: 6px; min-inline-size: 0; }
.crops img { inline-size: 100%; block-size: auto; border: 1px solid var(--rule); background: white; }
.crops figcaption { font: 400 12.5px/1.4 var(--sans); color: var(--ink-soft); }


.notes { display: grid; gap: 6px; padding-inline-start: 20px; font-size: 14px; color: var(--ink-soft); }
.doc-foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 24px; margin-block-start: 32px; padding-block-start: 12px; border-block-start: 3px double var(--rule-strong); font: 400 12px/1.5 var(--sans); color: var(--ink-soft); }

.intake { max-inline-size: 560px; margin: clamp(24px, 8vh, 80px) auto 120px; padding: clamp(24px, 5vw, 44px); background: var(--paper); border-radius: 2px; box-shadow: 0 1px 2px oklch(0 0 0 / 6%), 0 12px 40px oklch(0 0 0 / 8%); }
.intake h1 { font: 600 clamp(24px, 4vw, 30px)/1.3 var(--serif); letter-spacing: 0.04em; }
html[data-lang="en"] .intake h1 { letter-spacing: -0.01em; }
.intake > p { margin-block: 8px 22px; color: var(--ink-soft); }
.drop { display: grid; place-items: center; gap: 6px; padding: 32px 20px; border: 1px dashed var(--rule-strong); border-radius: 4px; text-align: center; cursor: pointer; }
.drop svg { inline-size: 28px; block-size: 28px; color: var(--ink-soft); }
.drop b { font: 600 15.5px/1.4 var(--sans); }
.drop span { font-size: 13px; color: var(--ink-soft); }
@media (hover: hover) and (pointer: fine) { .drop:hover { border-style: solid; background: color-mix(in oklch, var(--ink) 3%, transparent); } }
.intake .btn.primary { inline-size: 100%; justify-content: center; min-block-size: 46px; margin-block-start: 16px; font-size: 15px; }
.intake ul { margin-block-start: 18px; padding-inline-start: 18px; font-size: 13.5px; color: var(--ink-soft); display: grid; gap: 4px; }

@media (max-width: 640px) { .bar .btn span { display: none; } .kv { grid-template-columns: 1fr; } .kv dt { padding-block-end: 0; border: 0; } }
@media print { .bar { display: none; } body { background: white; } .doc-wrap { padding: 0; } .doc { box-shadow: none; max-inline-size: none; } }

/* demo app additions */
.lang { display: inline-flex; border: 1px solid var(--rule-strong); border-radius: 6px; overflow: hidden; }
.lang button { min-block-size: 34px; padding-inline: 11px; border: 0; background: transparent; color: var(--ink); font: 500 13px/1 var(--sans); cursor: pointer; }
.lang button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.drop.over { border-style: solid; background: color-mix(in oklch, var(--accent) 7%, transparent); }
.drop .picked { font-family: var(--mono); font-size: 13px; color: var(--ink); overflow-wrap: anywhere; }
.err { margin-block-start: 10px; padding: 8px 12px; border-inline-start: 3px solid var(--bad); background: var(--bad-tint); color: var(--bad); font-size: 14px; }
.err[hidden], .note[hidden] { display: none; }
.btn[disabled] { opacity: .6; cursor: progress; }
.spin { inline-size: 14px; block-size: 14px; border: 2px solid currentColor; border-inline-end-color: transparent; border-radius: 50%; animation: sp .8s linear infinite; display: none; }
.loading .spin { display: inline-block; }
.intake .btn.primary { gap: 10px; }
@keyframes sp { to { rotate: 360deg; } }
@media (prefers-reduced-motion: reduce) { .spin { animation-duration: 3s; } }
.samples { margin-block-start: 26px; padding-block-start: 16px; border-block-start: 1px solid var(--rule); }
.samples h2 { font: 600 14px/1.4 var(--sans); margin-block-end: 8px; }
.samples form { margin: 0; }
.intake .samples ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; font-size: 14px; }
.samples button { inline-size: 100%; display: flex; gap: 12px; align-items: baseline; padding: 9px 6px; border: 0; border-block-end: 1px solid var(--rule); background: transparent; text-align: start; font: 400 14px/1.4 var(--sans); color: var(--ink); cursor: pointer; }
.samples button b { font-weight: 600; min-inline-size: 5.5em; flex: none; }
.samples button .d { color: var(--ink-soft); }
.samples button[disabled] { opacity: .5; }
@media (hover: hover) and (pointer: fine) { .samples button:hover { background: color-mix(in oklch, var(--ink) 5%, transparent); } }
.note { color: var(--ink-soft); font-size: 14px; }
@media (max-width: 640px) { .samples button { flex-direction: column; gap: 2px; } }

.thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 150px), 1fr)); gap: 14px; margin-block-start: 12px; }
.thumbs figure { display: grid; gap: 6px; }
.thumbs img { inline-size: 100%; block-size: auto; border: 1px solid var(--rule); background: white; }
.thumbs figcaption { font: 400 12.5px/1.4 var(--sans); color: var(--ink-soft); }
.lead { font: 500 15px/1.5 var(--sans); }
.crops.grid { grid-template-columns: repeat(auto-fill, minmax(min(100%, 200px), 1fr)); }
.crops img { border: 1px solid var(--rule); }

.lang button, .mark { white-space: nowrap; }