/* css/style.css — botu (SPEC-430) pastel minimal, light/dark */
:root {
  --bg: #faf5ee;
  --card: #ffffff;
  --ink: #35313d;
  --muted: #8b8598;
  --accent: #7c6cf0;
  --accent-ink: #ffffff;
  --line: #ece4d8;
  --err-bg: #fdecec;
  --err-ink: #b42318;
  --radius: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1922;
    --card: #25222e;
    --ink: #ece9f2;
    --muted: #9d97ab;
    --line: #34303d;
    --err-bg: #3a2226;
    --err-ink: #f5a3a3;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}
main { max-width: 880px; margin: 0 auto; padding: 8px 20px 40px; }
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  max-width: 880px; margin: 0 auto; padding: 14px 20px;
}
.brand { font-weight: 700; font-size: 1.25rem; letter-spacing: 0.02em; }
.pill {
  background: var(--card); border: 1px solid var(--line); color: var(--ink);
  border-radius: 999px; padding: 5px 14px; cursor: pointer; font-size: 0.88rem;
}
.pill:hover { border-color: var(--accent); color: var(--accent); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.hero { text-align: center; margin: 26px 0 18px; }
.hero h2 { font-size: 1.65rem; margin: 0 0 8px; }
.sub { color: var(--muted); margin: 0; font-size: 0.95rem; }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px; margin: 16px auto; text-align: center;
}
.dropzone { max-width: 620px; padding: 52px 24px; cursor: pointer; border: 2px dashed var(--line); transition: border-color 0.15s, background 0.15s; }
.dropzone:hover, .dropzone.dragover { border-color: var(--accent); background: rgba(124, 108, 240, 0.06); }
.dropzone:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.dz-icon { font-size: 2.4rem; }
.dz-title { font-weight: 600; margin: 10px 0 4px; }
.dz-hint { color: var(--muted); font-size: 0.85rem; margin: 0; }
.work { max-width: 680px; }
.pair { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; }
.slot { margin: 0; }
.slot img { max-width: 240px; width: 100%; height: auto; border-radius: 14px; border: 1px solid var(--line); display: block; }
.slot figcaption { color: var(--muted); font-size: 0.8rem; margin-top: 6px; }
.arrow { color: var(--muted); font-size: 1.4rem; }
.meta { color: var(--muted); font-size: 0.82rem; margin: 10px 0 0; font-variant-numeric: tabular-nums; }
.hint { color: var(--muted); font-size: 0.9rem; margin: 6px 0 0; }
.loading { margin-top: 12px; }
.spinner {
  width: 40px; height: 40px; margin: 6px auto;
  border: 4px solid var(--line); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-note { font-weight: 600; margin: 8px 0 2px; }
.elapsed { color: var(--accent); font-size: 0.88rem; margin: 4px 0 0; font-variant-numeric: tabular-nums; }
.hintmsg { color: var(--muted); font-size: 0.85rem; margin: 4px 0 0; min-height: 1.4em; }
.btnrow { display: flex; gap: 10px; justify-content: center; margin-top: 16px; flex-wrap: wrap; align-items: center; }
.btn {
  display: inline-block; border-radius: 999px; padding: 10px 22px; font-size: 0.95rem;
  cursor: pointer; border: 1px solid var(--line); background: var(--card); color: var(--ink);
  text-decoration: none;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.5; pointer-events: none; }
.errbox {
  background: var(--err-bg); color: var(--err-ink); border-radius: var(--radius);
  padding: 12px 18px; margin: 12px auto; max-width: 620px; font-size: 0.92rem;
  word-break: break-word;
}
.gallery { margin-top: 48px; }
.gallery h2 { text-align: center; font-size: 1.4rem; margin-bottom: 6px; }
.gallery > .sub { text-align: center; margin-bottom: 18px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.gcard {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px; margin: 0;
}
.gcard .pair.sm { gap: 8px; }
.gcard .pair.sm img { max-width: 96px; border-radius: 10px; border: 1px solid var(--line); height: auto; }
.gcard figcaption { color: var(--muted); font-size: 0.82rem; margin-top: 10px; text-align: center; }
footer {
  border-top: 1px solid var(--line); margin-top: 48px; padding: 26px 20px 34px;
  max-width: 880px; margin-left: auto; margin-right: auto;
  color: var(--muted); font-size: 0.85rem;
}
footer .footnote { margin: 10px 0 2px; }
footer .copy { margin: 0; font-size: 0.8rem; }
@media (max-width: 560px) {
  .slot img { max-width: 40vw; }
  .hero h2 { font-size: 1.35rem; }
}