/* ═══════════════════════════════════════════
   RGB TO CMYK CONVERTER — MODERN UI
   ═══════════════════════════════════════════ */
:root {
  --rc-accent: #6366f1;
  --rc-accent-light: rgba(99,102,241,0.1);
  --rc-accent-glow: rgba(99,102,241,0.25);
  --rc-red: #ef4444;
  --rc-red-bg: rgba(239,68,68,0.1);
  --rc-cyan: #0077b6;
  --rc-magenta: #c9184a;
  --rc-yellow: #d4a017;
  --rc-black: #333;
  --rc-bg: var(--bg-glass);
  --rc-border: var(--border);
  --rc-radius: var(--radius-sm);
  --rc-font: var(--font);
  --rc-mono: 'SF Mono','Fira Code','Cascadia Code','Consolas',monospace;
}

.rc-card { padding: 1.5rem; }
@media (max-width: 480px) { .rc-card { padding: 1rem; } }

/* ── Drop Zone ── */
.rc-dropzone {
  position: relative;
  border: 2px dashed var(--rc-border);
  border-radius: var(--rc-radius);
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s;
  background: var(--rc-bg);
  margin-bottom: 1.25rem;
  outline: none;
}
.rc-dropzone:hover,
.rc-dropzone:focus-visible {
  border-color: var(--rc-accent);
  background: var(--rc-accent-light);
  box-shadow: 0 0 0 3px var(--rc-accent-glow);
}
.rc-dropzone.dragover {
  border-color: var(--rc-accent);
  background: var(--rc-accent-light);
  box-shadow: 0 0 0 4px var(--rc-accent-glow);
  transform: scale(1.01);
}
.rc-input-file {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.rc-drop-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  display: block;
  transition: transform 0.25s;
}
.rc-dropzone.dragover .rc-drop-icon { transform: translateY(-4px); }
.rc-drop-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 0.25rem;
}
.rc-drop-sub {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  margin: 0;
}
.rc-drop-formats {
  font-size: 0.65rem;
  color: var(--text-tertiary);
  margin-top: 0.5rem;
  opacity: 0.8;
}

/* ── Error Bar ── */
.rc-error-bar {
  display: none;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  background: var(--rc-red-bg);
  border: 1px solid var(--rc-red);
  border-radius: var(--rc-radius);
  margin-bottom: 1rem;
  font-size: 0.8rem;
  color: var(--rc-red);
}
.rc-error-bar.show { display: flex; }
.rc-error-icon { flex-shrink: 0; font-size: 1.1rem; line-height: 1.3; }

/* ── Processing ── */
.rc-processing {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  background: var(--rc-accent-light);
  border: 1px solid var(--rc-accent);
  border-radius: var(--rc-radius);
  margin-bottom: 1rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--rc-accent);
}
.rc-processing.show { display: flex; }
.rc-spinner {
  width: 18px;
  height: 18px;
  border: 2.5px solid var(--rc-border);
  border-top-color: var(--rc-accent);
  border-radius: 50%;
  animation: rcSpin 0.6s linear infinite;
}
@keyframes rcSpin { to { transform: rotate(360deg); } }

/* ── Preview Grid ── */
.rc-preview { display: none; }
.rc-preview.show { display: block; }
.rc-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.rc-channel-card {
  background: var(--rc-bg);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius);
  overflow: hidden;
}
.rc-channel-header {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.75rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--rc-border);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.rc-channel-canvas-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  min-height: 80px;
  background: repeating-conic-gradient(var(--rc-border) 0% 25%, transparent 0% 50%) 50% / 16px 16px;
}
.rc-channel-canvas-wrap canvas {
  max-width: 100%;
  max-height: 160px;
  object-fit: contain;
  border-radius: 2px;
}

/* ── Channel color borders ── */
.rc-channel-cyan .rc-channel-header { color: var(--rc-cyan); }
.rc-channel-magenta .rc-channel-header { color: var(--rc-magenta); }
.rc-channel-yellow .rc-channel-header { color: var(--rc-yellow); }
.rc-channel-black .rc-channel-header { color: var(--rc-black); }

/* ── Stats ── */
.rc-stats {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.75rem 1rem;
  background: var(--rc-bg);
  border: 1px solid var(--rc-border);
  border-radius: var(--rc-radius);
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  font-family: var(--rc-mono);
}
.rc-stats strong { font-weight: 700; color: var(--text); }
.rc-stats span { color: var(--text-secondary); }
.rc-stat-total strong { color: var(--rc-accent); }
.rc-stat-total span { color: var(--rc-accent); font-weight: 700; }

/* ── Info text ── */
.rc-info-text {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  font-style: italic;
  margin: 0 0 1rem;
  padding: 0.5rem 0.75rem;
  background: var(--rc-accent-light);
  border-radius: var(--rc-radius);
}

/* ── Buttons ── */
.rc-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.rc-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border: 1.5px solid var(--rc-border);
  border-radius: 50px;
  background: var(--rc-bg);
  color: var(--text-secondary);
  font-family: var(--rc-font);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.rc-btn:hover:not(:disabled) {
  border-color: var(--rc-accent);
  color: var(--rc-accent);
  background: var(--rc-accent-light);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--rc-accent-glow);
}
.rc-btn:active:not(:disabled) { transform: translateY(0); }
.rc-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.rc-btn.primary {
  background: var(--rc-accent);
  color: #fff;
  border-color: var(--rc-accent);
}
.rc-btn.primary:hover:not(:disabled) { filter: brightness(1.12); }

/* ── Toast ── */
.rc-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(1rem);
  background: var(--rc-accent);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 9999;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16,1,0.3,1);
  pointer-events: none;
  box-shadow: 0 8px 32px var(--rc-accent-glow);
  white-space: nowrap;
}
.rc-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.rc-toast.error { background: var(--rc-red); }

@media (max-width: 480px) {
  .rc-toast { bottom: 5rem; font-size: 0.78rem; padding: 0.55rem 1.1rem; }
  .rc-dropzone { padding: 1.5rem 1rem; }
  .rc-drop-icon { font-size: 2rem; }
  .rc-btn { padding: 0.5rem 1rem; font-size: 0.75rem; }
  .rc-preview-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}