:root {
  --bg: #fbfbfd;
  --panel: #ffffff;
  --panel-2: #f4f4f7;
  --ink: #16161a;
  --ink-2: #5d5d6b;
  --ink-3: #8b8b98;
  --line: #e4e4ea;
  --accent: #4f46e5;
  --accent-ink: #ffffff;
  --accent-soft: #eeedfd;
  --good: #0f7b52;
  --good-soft: #e7f5ee;
  --warn-ink: #8a5a00;
  --warn-soft: #fdf4e3;
  --warn-line: #f0dcae;
  --bad-ink: #b02a2a;
  --bad-soft: #fdeceb;
  --bad-line: #f2c9c6;
  --radius: 14px;
  --shadow: 0 1px 2px rgb(16 16 26 / 5%), 0 8px 28px -12px rgb(16 16 26 / 14%);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #0e0e12;
    --panel: #17171d;
    --panel-2: #1e1e26;
    --ink: #f2f2f5;
    --ink-2: #a9a9b8;
    --ink-3: #75758a;
    --line: #2a2a34;
    --accent: #8b83ff;
    --accent-ink: #12121a;
    --accent-soft: #211f3d;
    --good: #4ad699;
    --good-soft: #13291f;
    --warn-ink: #e8bf72;
    --warn-soft: #2a2114;
    --warn-line: #473719;
    --bad-ink: #ff9a92;
    --bad-soft: #2c1716;
    --bad-line: #4a2320;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 10px 30px -14px rgb(0 0 0 / 70%);
    color-scheme: dark;
  }
}

:root[data-theme='dark'] {
  --bg: #0e0e12;
  --panel: #17171d;
  --panel-2: #1e1e26;
  --ink: #f2f2f5;
  --ink-2: #a9a9b8;
  --ink-3: #75758a;
  --line: #2a2a34;
  --accent: #8b83ff;
  --accent-ink: #12121a;
  --accent-soft: #211f3d;
  --good: #4ad699;
  --good-soft: #13291f;
  --warn-ink: #e8bf72;
  --warn-soft: #2a2114;
  --warn-line: #473719;
  --bad-ink: #ff9a92;
  --bad-soft: #2c1716;
  --bad-line: #4a2320;
  --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 10px 30px -14px rgb(0 0 0 / 70%);
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.6 ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

code, .mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

/* ---------- chrome ---------- */

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 760px;
  margin: 0 auto;
  padding: 22px 16px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px 72px;
}

.hero { padding: 40px 0 28px; }

h1 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 5.5vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 650;
}

.lede {
  margin: 0;
  max-width: 56ch;
  color: var(--ink-2);
  font-size: 1.04rem;
}

.lede strong { color: var(--ink); font-weight: 600; }

footer {
  border-top: 1px solid var(--line);
  padding: 22px 16px 40px;
  text-align: center;
}

footer p { margin: 0; color: var(--ink-3); font-size: 0.85rem; }

/* ---------- card ---------- */

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}

/* ---------- drop zone ---------- */

.drop {
  border: 1.5px dashed var(--line);
  border-radius: 12px;
  background: var(--panel-2);
  padding: 44px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}

.drop:hover, .drop:focus-visible {
  border-color: var(--accent);
  background: var(--accent-soft);
  outline: none;
}

.drop.over {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: scale(1.005);
}

.drop-icon { width: 34px; height: 34px; color: var(--accent); }
.drop-main { margin: 10px 0 4px; font-weight: 600; }
.drop-sub { margin: 0; color: var(--ink-3); font-size: 0.87rem; }

/* ---------- busy ---------- */

.busy { display: flex; align-items: center; gap: 13px; padding: 26px 4px; }
.busy p { margin: 0; color: var(--ink-2); }

.spinner {
  width: 19px;
  height: 19px;
  flex: none;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2s; }
  .drop, .drop.over { transition: none; transform: none; }
}

/* ---------- file row ---------- */

.filerow {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.filemeta { min-width: 0; }

.filename {
  margin: 0;
  font-weight: 600;
  overflow-wrap: anywhere;
}

.filesub { margin: 2px 0 0; color: var(--ink-3); font-size: 0.87rem; }

/* ---------- specs ---------- */

.specs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: 1px;
  margin: 18px 0 20px;
  padding: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.specs > div {
  background: var(--panel);
  padding: 11px 13px;
}

.specs dt {
  margin: 0;
  color: var(--ink-3);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.specs dd {
  margin: 3px 0 0;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ---------- modes ---------- */

.modes {
  margin: 0 0 16px;
  padding: 0;
  border: 0;
  display: grid;
  gap: 9px;
}

.modes legend {
  padding: 0 0 9px;
  color: var(--ink-3);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.mode {
  display: flex;
  gap: 11px;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.mode:hover { border-color: var(--ink-3); }

.mode:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.mode input { margin: 4px 0 0; accent-color: var(--accent); flex: none; }
.mode-body { display: block; }

.mode-title {
  display: block;
  font-weight: 600;
  margin-bottom: 2px;
}

.mode-title em {
  font-style: normal;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: var(--panel);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 1px 7px;
  margin-left: 6px;
  vertical-align: 1px;
}

.mode-note { display: block; color: var(--ink-2); font-size: 0.88rem; }

/* ---------- advanced ---------- */

.advanced {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0 14px;
  margin-bottom: 18px;
}

.advanced summary {
  cursor: pointer;
  padding: 12px 0;
  font-weight: 600;
  font-size: 0.92rem;
}

.advanced[open] summary { border-bottom: 1px solid var(--line); margin-bottom: 12px; }

.check {
  display: flex;
  gap: 10px;
  padding: 7px 0;
  cursor: pointer;
  font-size: 0.93rem;
}

.check input { margin: 4px 0 0; accent-color: var(--accent); flex: none; }
.check small, .field small { display: block; color: var(--ink-3); font-size: 0.83rem; }

.field { display: block; padding: 9px 0 13px; font-size: 0.93rem; }
.field > span { display: block; margin-bottom: 5px; font-weight: 500; }

.field input {
  width: 82px;
  padding: 6px 9px;
  font: inherit;
  color: var(--ink);
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 4px;
}

/* ---------- buttons ---------- */

.primary, .ghost {
  font: inherit;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
  transition: opacity 0.15s, background 0.15s, border-color 0.15s;
}

.primary {
  display: block;
  width: 100%;
  padding: 13px 18px;
  text-align: center;
  text-decoration: none;
  color: var(--accent-ink);
  background: var(--accent);
  border: 0;
}

.primary:hover { opacity: 0.88; }
.primary:disabled { opacity: 0.5; cursor: default; }

.ghost {
  padding: 7px 13px;
  flex: none;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--line);
  font-size: 0.88rem;
}

.ghost:hover { color: var(--ink); border-color: var(--ink-3); }

#theme {
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 50%;
  font-size: 1rem;
  line-height: 1;
}

/* ---------- result ---------- */

.result { text-align: center; padding: 8px 0 4px; }

.tick {
  width: 44px;
  height: 44px;
  margin: 0 auto 14px;
  display: grid;
  place-items: center;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--good);
  background: var(--good-soft);
  border-radius: 50%;
}

.result h2 { margin: 0 0 5px; font-size: 1.25rem; letter-spacing: -0.01em; }
.resultsub { margin: 0 0 18px; color: var(--ink-2); font-size: 0.93rem; }

.didlist {
  list-style: none;
  margin: 18px 0;
  padding: 14px 16px;
  text-align: left;
  background: var(--panel-2);
  border-radius: 10px;
  font-size: 0.89rem;
  color: var(--ink-2);
}

.didlist li { padding: 3px 0 3px 21px; position: relative; }

.didlist li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--good);
  font-weight: 700;
}

.didlist li.skip::before { content: '–'; color: var(--ink-3); }

.result .ghost { margin: 0 auto; }

/* ---------- notices ---------- */

.notice {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 0.91rem;
}

.notice strong { display: block; margin-bottom: 5px; }
.notice p { margin: 0 0 8px; }
.notice p:last-of-type { margin-bottom: 0; }

.notice.error {
  color: var(--bad-ink);
  background: var(--bad-soft);
  border-color: var(--bad-line);
}

.notice.error .ghost { margin-top: 11px; color: var(--bad-ink); border-color: var(--bad-line); }

.notice.warn {
  color: var(--warn-ink);
  background: var(--warn-soft);
  border-color: var(--warn-line);
  margin-top: 28px;
}

/* ---------- explainer ---------- */

.explain { padding-top: 52px; }

.explain h2 {
  margin: 0 0 12px;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.explain > p { margin: 0 0 24px; color: var(--ink-2); max-width: 62ch; }
.explain em { color: var(--ink); font-style: italic; }

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 20px;
}

.steps li {
  counter-increment: step;
  padding-left: 42px;
  position: relative;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
}

.steps h3 { margin: 3px 0 4px; font-size: 1rem; letter-spacing: -0.01em; }
.steps p { margin: 0; color: var(--ink-2); font-size: 0.93rem; }

@media (max-width: 560px) {
  .card { padding: 16px; }
  .drop { padding: 34px 14px; }
  .hero { padding: 28px 0 22px; }
  .explain { padding-top: 40px; }
}

/* Author display rules would otherwise beat the UA rule for [hidden]. */
[hidden] { display: none !important; }