:root {
  --bg: #f6f3ec;
  --surface: #ffffff;
  --ink: #1b1a17;
  --ink-2: #4b483f;
  --line: #ddd6c8;
  --signal: #f2a900;
  --signal-ink: #1b1a17;
  --signal-soft: #fff2cc;
  --empty: #0e7490;
  --focus: #1d4ed8;
  --xray-bg: #0d0d0c;
  --radius: 12px;
  --shadow: 0 1px 2px rgb(27 26 23 / 8%), 0 4px 16px rgb(27 26 23 / 6%);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141311;
    --surface: #1d1b18;
    --ink: #f1ede4;
    --ink-2: #bdb6a8;
    --line: #38342d;
    --signal: #f2b32a;
    --signal-ink: #141311;
    --signal-soft: #3a2e12;
    --empty: #5cc8e0;
    --focus: #8fb2ff;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: inherit; }
a:focus-visible, button:focus-visible, .sample:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 8px; }
.skip:focus { left: 8px; z-index: 10; }

/* Header and views */
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 16px 6px;
}
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 750; font-size: 20px; text-decoration: none; letter-spacing: -0.01em; }
.brand-mark { width: 28px; height: 28px; }
.brand-mark rect { fill: none; stroke: var(--ink); stroke-width: 2.2; }
.brand-mark path { fill: var(--signal); stroke: var(--ink); stroke-width: 1.2; stroke-linejoin: round; }

.tabs { display: flex; gap: 4px; background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 4px; }
.tabs a {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 0 14px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-2);
  white-space: nowrap;
}
.tabs a[aria-current="page"] { background: var(--ink); color: var(--bg); }

main { max-width: 1120px; margin: 0 auto; padding: 8px 16px 32px; }
.intro { max-width: 640px; margin: 18px 0 20px; }
h1 { font-size: clamp(28px, 6vw, 40px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 10px; }
.intro p { margin: 0; color: var(--ink-2); font-size: 17px; }
.small-heading { font-size: 14px; font-weight: 650; color: var(--ink-2); margin: 0 0 10px; text-transform: none; }
.muted { color: var(--ink-2); }

/* Buttons and inputs */
.file { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 20px;
  border: 1.5px solid var(--ink);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  transition: transform 120ms ease, background-color 150ms ease;
}
.button svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linejoin: round; }
.button.primary { background: var(--ink); color: var(--bg); }
.button:active { transform: scale(0.98); }
.button[disabled] { opacity: 0.55; cursor: progress; }
.file:focus-visible + .button { outline: 3px solid var(--focus); outline-offset: 2px; }

.capture { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; }

/* Sample thumbnails */
.sample-row, .sample-grid { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.sample-row { grid-template-columns: repeat(auto-fill, minmax(84px, 1fr)); max-width: 640px; }
.sample-grid { grid-template-columns: repeat(auto-fill, minmax(64px, 1fr)); }
.sample {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  padding: 0;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--surface);
  cursor: pointer;
}
.sample img { width: 100%; height: 100%; object-fit: cover; display: block; }
.sample[aria-pressed="true"] { border-color: var(--ink); border-width: 3px; }
.sample.flag { border-color: var(--signal); border-width: 3px; }

/* Result card */
.result { margin-top: 24px; max-width: 640px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-photo { display: grid; grid-template-columns: 96px 1fr; gap: 14px; padding: 14px; align-items: center; }
.card-photo img { width: 96px; height: 96px; object-fit: cover; border-radius: 8px; }
.verdict { padding: 14px 16px; font-weight: 750; font-size: 20px; line-height: 1.25; }
.verdict.battery { background: var(--signal); color: var(--signal-ink); }
.verdict.unsure { background: var(--signal-soft); }
.verdict.none { background: var(--bg); }
.what { margin: 0; color: var(--ink-2); }
.what strong { color: var(--ink); }
.steps { margin: 0; padding: 4px 16px 16px 36px; }
.steps li { margin: 8px 0; }
.card .why { margin: 0; padding: 0 16px 16px; color: var(--ink-2); font-size: 15px; }
.question { padding: 16px; display: grid; gap: 12px; }
.question p { margin: 0; font-weight: 650; }
.question .answers { display: flex; gap: 10px; flex-wrap: wrap; }
.status { display: flex; align-items: center; gap: 10px; padding: 16px; color: var(--ink-2); }
.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2.5px solid var(--line); border-top-color: var(--ink); animation: spin 0.8s linear infinite; }
.progress { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; margin: 0 16px 16px; }
.progress span { display: block; height: 100%; background: var(--ink); width: 0; transition: width 150ms linear; }
.linkish { background: none; border: 0; padding: 0; font: inherit; color: var(--ink); text-decoration: underline; cursor: pointer; min-height: 44px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* X-ray view */
.xray-layout { display: grid; gap: 20px; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); align-items: start; }
.xray-stage { margin: 0; background: var(--xray-bg); border-radius: var(--radius); padding: 10px; }
.xray-stage canvas { width: 100%; height: auto; display: block; border-radius: 6px; background: #000; }
.legend { display: flex; flex-wrap: wrap; gap: 14px; padding: 10px 4px 2px; color: #e6e1d6; font-size: 14px; }
.key { display: inline-flex; align-items: center; gap: 8px; }
.key::before { content: ""; width: 22px; height: 12px; border-radius: 2px; }
.key.battery::before { border: 3px solid #f2a900; }
.key.empty::before { border: 3px dashed #5cc8e0; }
.key.device::before { border: 1.5px solid #9a9488; }
.decision { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); min-height: 112px; box-shadow: var(--shadow); overflow: hidden; }
.decision .muted { padding: 16px; margin: 0; }
.decision ul { margin: 0; padding: 4px 16px 16px 34px; color: var(--ink-2); }
.tally { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 14px 0; }
.tally div { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.tally dt { font-size: 13px; color: var(--ink-2); }
.tally dd { margin: 2px 0 0; font-size: 26px; font-weight: 750; font-variant-numeric: tabular-nums; }
.xray-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.summary { margin: 12px 0 0; font-size: 15px; color: var(--ink-2); }
.summary:empty { display: none; }

/* Results */
.results-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); align-items: start; }
.results-grid .card { padding: 18px; }
.results-grid h2 { font-size: 20px; margin: 0 0 4px; }
.results-grid .sub { margin: 0 0 14px; color: var(--ink-2); font-size: 15px; }
.big-numbers { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin-bottom: 16px; }
.big-numbers div { border-top: 3px solid var(--ink); padding-top: 6px; }
.big-numbers .n { font-size: 30px; font-weight: 780; font-variant-numeric: tabular-nums; line-height: 1.1; }
.big-numbers .l { font-size: 14px; color: var(--ink-2); }
.bars { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.bars li { display: grid; grid-template-columns: minmax(0, 9em) 1fr 3.2em; gap: 8px; align-items: center; font-size: 14px; }
.bars .bar { height: 10px; background: var(--line); border-radius: 5px; overflow: hidden; }
.bars .bar span { display: block; height: 100%; background: var(--ink); }
.bars .v { text-align: right; font-variant-numeric: tabular-nums; }
.note { font-size: 14px; color: var(--ink-2); margin: 14px 0 0; }
.note.lead { margin: 0 0 14px; }

.foot { max-width: 1120px; margin: 0 auto; padding: 18px 16px 40px; color: var(--ink-2); font-size: 14px; border-top: 1px solid var(--line); }
.foot p { margin: 4px 0; }

@media (max-width: 760px) {
  .xray-layout { grid-template-columns: 1fr; }
  .tabs { width: 100%; justify-content: space-between; }
  .tabs a { flex: 1; justify-content: center; padding: 0 8px; font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation-duration: 1.5s !important; }
}