:root {
  --bg: #f7f6f1;
  --fg: #1c1b18;
  --muted: #6b6b66;
  --line: #d8d6cc;
  --accent: #2d59c8;
  --accent-fg: #fff;
  --warn: #b25c00;
  --error: #b00020;
  --ok: #1f7a3a;
  --card-bg: #fff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14140f;
    --fg: #ebe7d8;
    --muted: #9b9888;
    --line: #2e2d27;
    --accent: #8ab0ff;
    --accent-fg: #0a0a08;
    --warn: #ffb066;
    --error: #ff8a8a;
    --ok: #7ad99a;
    --card-bg: #1c1b16;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
  letter-spacing: -0.01em;
}

.tag {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  margin-left: 0.4rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  vertical-align: middle;
}

.lede {
  margin: 0 0 1.5rem;
  color: var(--muted);
  max-width: 60ch;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem 1.25rem;
  margin-bottom: 1.25rem;
}

.row { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 0.85rem; }
.row.three .field { flex: 1 1 0; min-width: 8rem; }
.row.actions { align-items: center; }

.field { display: flex; flex-direction: column; gap: 0.25rem; flex: 1 1 100%; }
.field span {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
.field input, .field select {
  font: inherit;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg);
}

button#reflow {
  font: inherit;
  font-weight: 600;
  padding: 0.65rem 1.2rem;
  background: var(--accent);
  color: var(--accent-fg);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
button#reflow:disabled { opacity: 0.5; cursor: not-allowed; }

a#download {
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  padding: 0.55rem 0.9rem;
  border: 1px solid currentColor;
  border-radius: 8px;
}
a#download:hover { text-decoration: underline; }

/* Progress bar. The fill animates via CSS transform so the bar keeps
   moving on the compositor thread while pyodide.runPython blocks the
   main JS thread for the reflow's duration. */
.progress {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.85rem;
}
.progress-bar {
  flex: 1;
  height: 6px;
  background: var(--line);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
}
.progress-fill {
  position: absolute;
  inset: 0;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
}
.progress-fill.determinate {
  /* JS sets `transition-duration` to the estimated runtime and then
     toggles `transform: scaleX(0.99)`; the compositor handles the
     interpolation so it runs while runPython is blocking. */
  transition-property: transform;
  transition-timing-function: linear;
}
.progress-fill.finishing {
  transition: transform 0.3s ease-out;
  transform: scaleX(1) !important;
}
.progress-fill.indeterminate {
  /* Used while Pyodide / PyMuPDF are still loading and we don't have
     a duration estimate yet. */
  animation: indeterminate 1.4s ease-in-out infinite;
  transform-origin: left center;
}
@keyframes indeterminate {
  0%   { transform: translateX(-100%) scaleX(0.4); }
  50%  { transform: translateX(20%) scaleX(0.6); }
  100% { transform: translateX(120%) scaleX(0.4); }
}
.progress-eta {
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--muted);
  min-width: 4ch;
  text-align: right;
}

.status {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
}
.status[data-kind="busy"]  { color: var(--accent); }
.status[data-kind="error"] { color: var(--error); }
.status[data-kind="warn"]  { color: var(--warn); }
.status[data-kind="ready"] { color: var(--ok); }
.status[data-kind="info"]  { color: var(--muted); }

.stats { margin: 0.3rem 0 0; color: var(--muted); font-size: 0.9rem; }

details summary {
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

pre#log {
  margin: 0.75rem 0 0;
  padding: 0.85rem;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  font: 0.8rem/1.45 ui-monospace, SFMono-Regular, Menlo, monospace;
  max-height: 14rem;
  overflow: auto;
  white-space: pre-wrap;
}

footer {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.85rem;
}

footer a { color: var(--accent); }