:root {
  --bg: #0f1216;
  --panel: #171c22;
  --panel-2: #1e252d;
  --border: #2a333d;
  --text: #e6edf3;
  --muted: #9aa7b4;
  --accent: #3b82f6;
  --accent-hover: #2f6fe0;
  --good: #34d399;
  --bad: #f87171;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #1a2230, var(--bg));
  color: var(--text);
  min-height: 100vh;
}

.app {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

header h1 { margin: 0 0 4px; font-size: 1.7rem; letter-spacing: -0.02em; }
.sub { margin: 0 0 24px; color: var(--muted); }

h2 { font-size: 1rem; margin: 0 0 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }

.drop {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s, transform .05s;
  outline: none;
}
.drop:hover, .drop:focus-visible { border-color: var(--accent); }
.drop.dragover { border-color: var(--accent); background: var(--panel-2); transform: scale(1.005); }
.drop-icon { font-size: 2.4rem; color: var(--accent); line-height: 1; }
.drop-title { font-size: 1.15rem; margin: 10px 0 4px; }
.drop-hint { color: var(--muted); margin: 0; }

.link-btn {
  background: none; border: none; color: var(--accent);
  cursor: pointer; font: inherit; padding: 0; text-decoration: underline;
}

section { margin-top: 24px; }
.hidden { display: none !important; }

.list-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
#count { color: var(--muted); font-size: .95rem; }
.list-actions { display: flex; gap: 8px; }

.thumbs {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 10px;
}
.thumb {
  position: relative; border: 1px solid var(--border); border-radius: 10px;
  overflow: hidden; background: var(--panel-2); aspect-ratio: 1; cursor: grab;
}
.thumb.dragging { opacity: .4; }
.thumb.drop-target { outline: 2px solid var(--accent); }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; pointer-events: none; }
.thumb .idx {
  position: absolute; top: 4px; left: 4px; background: rgba(0,0,0,.65);
  color: #fff; font-size: .72rem; padding: 1px 6px; border-radius: 6px;
}
.thumb .rm {
  position: absolute; top: 4px; right: 4px; width: 22px; height: 22px;
  border: none; border-radius: 50%; background: rgba(0,0,0,.65); color: #fff;
  cursor: pointer; font-size: 14px; line-height: 22px; padding: 0;
}
.thumb .rm:hover { background: var(--bad); }
.thumb .name {
  position: absolute; bottom: 0; left: 0; right: 0; padding: 3px 5px;
  background: rgba(0,0,0,.7); font-size: .68rem; white-space: nowrap;
  overflow: hidden; text-overflow: ellipsis;
}
.reorder-hint { color: var(--muted); font-size: .82rem; margin: 8px 0 0; }

.options { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.opt { display: flex; align-items: center; gap: 10px; margin: 8px 0; cursor: pointer; }
.opt input[type="number"] { width: 80px; }
.opt-sub {
  margin: 4px 0 12px 28px; padding: 10px 14px; border-left: 2px solid var(--border);
  display: grid; gap: 12px;
}
.opt-sub.hidden { display: none; }
.opt-sub label { display: flex; align-items: center; gap: 10px; color: var(--muted); flex-wrap: wrap; }
#quality-out { min-width: 2ch; color: var(--text); font-variant-numeric: tabular-nums; }
.note { color: var(--muted); font-size: .82rem; margin: 10px 0 0; }

input[type="number"], input[type="range"] {
  accent-color: var(--accent);
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 8px;
}
input[type="range"] { padding: 0; }

.actions { display: flex; align-items: center; gap: 14px; }
button.primary {
  background: var(--accent); color: #fff; border: none; border-radius: 10px;
  padding: 12px 22px; font-size: 1rem; font-weight: 600; cursor: pointer;
  transition: background .15s, opacity .15s;
}
button.primary:hover:not(:disabled) { background: var(--accent-hover); }
button.primary:disabled { opacity: .5; cursor: not-allowed; }

button.ghost {
  background: transparent; color: var(--muted); border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 12px; cursor: pointer; font-size: .85rem;
}
button.ghost:hover { color: var(--text); border-color: var(--accent); }

.status { color: var(--muted); font-size: .92rem; }
.status.good { color: var(--good); }
.status.bad { color: var(--bad); }

footer { margin-top: 28px; display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: .82rem; }
.badge {
  background: var(--panel-2); border: 1px solid var(--border);
  padding: 3px 10px; border-radius: 999px; font-size: .78rem; color: var(--good);
}
.badge.lossy { color: #fbbf24; }