:root {
  --bg: #0f1226;
  --bg2: #151a35;
  --card: #1b2145;
  --card2: #232a55;
  --line: #2f3872;
  --text: #eaecff;
  --muted: #9aa2d0;
  --accent: #6d5efc;
  --accent2: #22d3ee;
  --green: #34d399;
  --red: #fb7185;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 16px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(109,94,252,.25), transparent 60%),
    radial-gradient(1000px 500px at 110% 0%, rgba(34,211,238,.18), transparent 55%),
    var(--bg);
  min-height: 100vh;
  line-height: 1.6;
}
.wrap { width: min(1000px, 92vw); margin: 0 auto; }
a { color: var(--accent2); }

.site-header { padding: 34px 0 10px; }
.site-header h1 { font-size: 30px; margin: 0 0 6px; letter-spacing: .5px; }
.logo { font-size: 28px; }
.tagline { margin: 0; color: var(--muted); }
.tagline b { color: var(--text); }
.privacy { display: inline-block; margin-top: 8px; font-size: 14px; color: #b9c0ee; }
.privacy b { color: var(--green); }

.chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 999px; font-size: 13px;
  background: var(--card); border: 1px solid var(--line); margin: 14px 0 6px; color: var(--muted);
}
.chip .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.chip-loading .dot { background: #f4bf50; animation: pulse 1.2s infinite; }
.chip-ready { color: var(--green); }
.chip-ready .dot { background: var(--green); }
.chip-error { color: var(--red); }
.chip-error .dot { background: var(--red); }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.35} }

.card {
  background: linear-gradient(180deg, var(--card), var(--bg2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  margin: 16px 0;
  box-shadow: var(--shadow);
}
.step h2 { margin: 0 0 16px; font-size: 20px; display: flex; align-items: center; gap: 10px; }
.num {
  display: inline-grid; place-items: center;
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--accent); color: #fff; font-size: 15px; font-weight: 700;
}

/* dropzone */
.dropzone {
  display: block; border: 2px dashed var(--line); border-radius: 14px;
  padding: 34px; text-align: center; cursor: pointer; transition: .18s;
  background: rgba(255,255,255,.02);
}
.dropzone:hover, .dropzone.drag { border-color: var(--accent); background: rgba(109,94,252,.08); }
.dz-icon { font-size: 40px; }
.dz-title { font-size: 17px; margin-top: 8px; font-weight: 600; }
.dz-hint { color: var(--muted); font-size: 13px; margin-top: 6px; }
.file-meta { margin-top: 14px; color: var(--muted); font-size: 14px; }
.file-meta b { color: var(--text); }

/* controls */
.controls-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.toggle { display: inline-flex; align-items: center; gap: 7px; background: var(--card2); padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line); cursor: pointer; user-select: none; }
.toggle input { accent-color: var(--accent); width: 16px; height: 16px; }
.select-field { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: 14px; }
select, input[type="range"] { color: var(--text); }
select { background: var(--card2); border: 1px solid var(--line); border-radius: 9px; padding: 8px 10px; }
.strength-field input { width: 120px; accent-color: var(--accent); }

.btn {
  border: 1px solid transparent; border-radius: 11px; padding: 10px 18px;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: .15s;
  background: var(--card2); color: var(--text); text-decoration: none; display: inline-flex; align-items: center; gap: 6px;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--accent), #8b7cff); color: #fff; box-shadow: 0 8px 20px rgba(109,94,252,.35); }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--muted); }
.btn-ghost:hover { color: var(--text); border-color: var(--accent); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 13px 26px; font-size: 16px; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }

/* progress */
.progress { margin-top: 16px; }
.progress-bar { height: 12px; background: var(--card2); border-radius: 999px; overflow: hidden; border: 1px solid var(--line); }
.progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent2)); transition: width .15s; }
.progress-meta { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; color: var(--muted); font-size: 13px; }

.note { color: var(--muted); font-size: 13px; margin: 14px 0 0; }
.note b { color: #c7cdf5; }

/* review layout */
.review-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: 20px; }
@media (max-width: 820px) { .review-grid { grid-template-columns: 1fr; } }
.preview-wrap { position: relative; background: #000; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); }
#previewCanvas { display: block; width: 100%; height: auto; touch-action: none; cursor: crosshair; }
.draw-hint { position: absolute; inset: auto 0 0 0; background: rgba(109,94,252,.9); color: #fff; text-align: center; padding: 6px; font-size: 13px; }
.scrub { width: 100%; margin: 12px 0 6px; accent-color: var(--accent); }
.preview-tools { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.legend { color: var(--muted); font-size: 12.5px; margin: 10px 0 0; }
.sw { display: inline-block; width: 12px; height: 12px; border-radius: 3px; vertical-align: -1px; margin-right: 3px; }
.sw-red { background: transparent; border: 2px dashed var(--red); }
.sw-green { background: var(--green); }

.list-actions { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.sel-count { color: var(--muted); font-size: 13px; margin-left: auto; }
.detect-list { max-height: 460px; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; padding-right: 4px; }
.group-title { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; margin: 6px 2px 2px; }
.det-item {
  display: flex; align-items: center; gap: 10px; padding: 8px; border-radius: 10px;
  background: var(--card2); border: 1px solid var(--line); cursor: pointer; transition: .12s;
}
.det-item:hover { border-color: var(--accent); }
.det-item.on { border-color: var(--green); box-shadow: inset 0 0 0 1px rgba(52,211,153,.5); }
.det-item img { width: 52px; height: 52px; object-fit: cover; border-radius: 7px; background: #000; flex: none; }
.det-item .di-info { flex: 1; min-width: 0; }
.det-item .di-title { font-size: 14px; font-weight: 600; }
.det-item .di-sub { font-size: 12px; color: var(--muted); }
.det-item input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--green); flex: none; }
.det-item .di-del { background: none; border: none; color: var(--red); cursor: pointer; font-size: 16px; flex: none; }
.empty-hint { color: var(--muted); font-size: 13px; padding: 10px; text-align: center; }

.actions-bar { display: flex; align-items: center; gap: 14px; margin-top: 18px; flex-wrap: wrap; }
.hint-inline { color: var(--muted); font-size: 13px; }

/* result */
.result video { width: 100%; border-radius: 12px; background: #000; border: 1px solid var(--line); }
.result-actions { display: flex; align-items: center; gap: 12px; margin-top: 14px; flex-wrap: wrap; }

.warn { background: rgba(251,113,133,.12); border-color: rgba(251,113,133,.5); color: #ffd7de; }

.site-footer { padding: 30px 0 50px; color: var(--muted); font-size: 13px; text-align: center; }

/* engine loading overlay */
.overlay { position: fixed; inset: 0; background: rgba(9,11,26,.82); backdrop-filter: blur(3px); display: flex; align-items: center; justify-content: center; z-index: 100; }
/* `.overlay` sets display:flex, which would otherwise override the `hidden`
   attribute's display:none and leave the overlay covering (and blocking) the page. */
.overlay[hidden] { display: none; }
.overlay-card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 30px 34px; text-align: center; max-width: 360px; box-shadow: var(--shadow); }
.overlay-title { font-size: 18px; font-weight: 700; margin-top: 16px; }
.overlay-sub { color: var(--muted); font-size: 13.5px; margin-top: 8px; }
.spinner { width: 44px; height: 44px; margin: 0 auto; border: 4px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }