:root {
  --bg: #0e0f13;
  --panel: #181a21;
  --panel-2: #20232c;
  --line: #2c2f3a;
  --text: #e8e9ee;
  --muted: #9aa0ad;
  --r: #ff3b30;
  --g: #34c759;
  --b: #4a8cff;
  --accent: #6c8cff;
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: radial-gradient(1200px 700px at 50% -10%, #1a1d27 0%, var(--bg) 60%);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 2.4rem 1rem 1rem;
}
header h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: -0.02em;
}
header h1 .r { color: var(--r); }
header h1 .g { color: var(--g); }
header h1 .b { color: var(--b); }
.tag { color: var(--muted); margin: 0.5rem 0 0; }
.tag b { color: var(--text); font-weight: 600; }

main {
  flex: 1;
  width: min(880px, 92vw);
  margin: 0 auto;
  padding: 1rem 0 2rem;
}

.hidden { display: none !important; }

/* Drop zone */
.drop {
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 3rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s, transform .05s;
}
.drop:hover, .drop:focus, .drop.dragover {
  border-color: var(--accent);
  background: var(--panel-2);
  outline: none;
}
.drop.dragover { transform: scale(1.005); }
.drop-icon {
  font-size: 2.4rem;
  color: var(--accent);
  line-height: 1;
}
.drop-inner p { margin: 0.6rem 0 0; }
.hint { color: var(--muted); font-size: 0.85rem; }

/* Workspace */
.filebar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 0 1rem;
  flex-wrap: wrap;
}
.filename { font-weight: 600; word-break: break-all; }
.badge {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--muted);
}
.badge.jpg { color: var(--g); border-color: #2c4a33; }
.badge.raw { color: var(--b); border-color: #2c3a5a; }
.link {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.85rem;
}
.link:hover { text-decoration: underline; }

/* Swap selector */
.swaps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 0.55rem;
  margin-bottom: 1.4rem;
}
.swap-group-label {
  grid-column: 1 / -1;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0.6rem 0 0.1rem;
}
.swap {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 10px;
  padding: 0.6rem 0.4rem;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: border-color .12s, background .12s, transform .05s;
}
.swap:hover { border-color: var(--accent); }
.swap:active { transform: scale(0.97); }
.swap.active {
  border-color: var(--accent);
  background: linear-gradient(180deg, #2a2f44, #20232c);
  box-shadow: 0 0 0 1px var(--accent) inset;
}
.swap .bars {
  display: flex;
  height: 6px;
  border-radius: 3px;
  overflow: hidden;
  margin-top: 0.4rem;
}
.swap .bars span { flex: 1; }

/* Preview */
.preview-wrap { margin-bottom: 1.2rem; }
.preview-label { font-size: 0.8rem; color: var(--muted); margin-bottom: 0.4rem; }
.preview {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    repeating-conic-gradient(#1b1d24 0% 25%, #14161c 0% 50%) 50% / 22px 22px;
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.preview img {
  max-width: 100%;
  max-height: 62vh;
  display: block;
}
.placeholder { color: var(--muted); padding: 2rem; }
.spinner {
  position: absolute;
  width: 38px; height: 38px;
  border: 3px solid rgba(255,255,255,0.15);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Actions */
.actions { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.primary {
  background: var(--accent);
  color: #0b0d12;
  border: none;
  border-radius: 10px;
  padding: 0.7rem 1.3rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: filter .12s, transform .05s;
}
.primary:hover:not(:disabled) { filter: brightness(1.08); }
.primary:active:not(:disabled) { transform: scale(0.98); }
.primary:disabled { opacity: 0.45; cursor: not-allowed; }
.status { color: var(--muted); font-size: 0.9rem; }
.status.error { color: var(--r); }
.note {
  margin-top: 0.9rem;
  font-size: 0.82rem;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.6rem 0.8rem;
}
.note b { color: var(--text); }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
  padding: 1.4rem 1rem 2rem;
}