:root {
  --bg: #0d1017;
  --panel: #161b26;
  --panel-2: #1e2532;
  --line: #2a3341;
  --text: #e8ecf4;
  --muted: #8b97a8;
  --accent: #ff2d78;
  --accent-2: #35d0ba;
  --ok: #3ad07a;
  --warn: #f5c451;
  --err: #ff5a5a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px clamp(12px, 3vw, 24px) 40px;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.topbar h1 {
  font-size: clamp(18px, 4vw, 24px);
  margin: 0;
  letter-spacing: 0.3px;
}

.stats {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--muted);
}

.stat b { color: var(--text); font-variant-numeric: tabular-nums; }

.status {
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  font-size: 12px;
}
.status.ok   { color: var(--ok);   border-color: color-mix(in srgb, var(--ok) 40%, var(--line)); }
.status.warn { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, var(--line)); }
.status.err  { color: var(--err);  border-color: color-mix(in srgb, var(--err) 40%, var(--line)); }

.stage {
  position: relative;
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  background: #000;
  border: 1px solid var(--line);
  box-shadow: 0 20px 60px -30px rgba(0,0,0,0.8);
}

#input-video {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

#output-canvas {
  display: block;
  width: 100%;
  height: auto;
}

.flash {
  position: absolute;
  inset: 0;
  background: #fff;
  opacity: 0;
  pointer-events: none;
}
.flash.go {
  animation: flash 0.22s ease-out;
}
@keyframes flash {
  from { opacity: 0.9; }
  to   { opacity: 0; }
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
  margin-top: 14px;
}

.group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.06s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { background: var(--panel-2); }
.btn:active { transform: translateY(1px); }

.btn.active,
.btn[data-filter].active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 18%, var(--panel));
  color: #fff;
}

.btn.toggle.active {
  border-color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 18%, var(--panel));
}

.btn.primary {
  border-color: color-mix(in srgb, var(--accent) 60%, var(--line));
  background: linear-gradient(180deg, var(--accent), #d81f63);
  color: #fff;
  font-weight: 600;
}

.btn.ghost { color: var(--muted); }

.hint {
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
}
.hint code {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 12px;
}

.hint.credit {
  margin-top: 6px;
  font-size: 12px;
  opacity: 0.75;
}
.hint.credit a { color: var(--accent-2); }

@media (max-width: 560px) {
  .controls { justify-content: stretch; }
  .group { flex: 1 1 100%; }
  .btn { flex: 1 1 auto; text-align: center; }
}