:root {
  --bg-deep: #0b0f19;
  --bg-panel: #111827;
  --bg-card: #1a2234;
  --border: #2a3548;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --danger: #ef4444;
  --radius: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

.app {
  display: grid;
  grid-template-rows: 60px 1fr 90px;
  height: 100vh;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
}

.logo-icon { color: var(--accent); font-size: 1.5rem; }
.header-actions { display: flex; gap: 10px; }

.main {
  display: grid;
  grid-template-columns: 1fr 340px;
  overflow: hidden;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  padding: 20px;
  overflow: hidden;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.preview-header h2 { font-size: 1.1rem; font-weight: 600; }

.view-toggle {
  display: flex;
  background: var(--bg-card);
  border-radius: 8px;
  padding: 3px;
}

.toggle {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
}

.toggle.active { background: var(--accent); color: white; }

.preview-area {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  min-height: 0;
}

.preview-area.single { grid-template-columns: 1fr; }
.preview-area.single #originalBox { display: none; }

.preview-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-box .label {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(0,0,0,0.6);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  z-index: 2;
}

.preview-box img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: none;
}

.preview-box img.visible { display: block; }

.placeholder {
  color: var(--text-muted);
  font-size: 0.95rem;
  text-align: center;
  padding: 20px;
}

.controls-panel {
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  padding: 18px;
  overflow-y: auto;
}

.controls-panel h3 {
  font-size: 1rem;
  margin-bottom: 16px;
  font-weight: 600;
}

.control-group { margin-bottom: 18px; }

.control-group > label {
  display: block;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.switch {
  display: flex !important;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  color: var(--text) !important;
}

.switch input { width: 16px; height: 16px; accent-color: var(--accent); }

.slider-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
}

.slider-row span:first-child {
  font-size: 0.78rem;
  color: var(--text-muted);
  min-width: 65px;
}

.slider-row input[type="range"] { flex: 1; accent-color: var(--accent); }
.slider-row span:last-child { font-size: 0.78rem; min-width: 28px; text-align: right; }

select {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 0.88rem;
  outline: none;
}

select:focus { border-color: var(--accent); }

/* 30 cores */
.solid-colors {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 6px;
}

.color-swatch {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 6px;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: transform 0.12s, border-color 0.12s;
}

.color-swatch:hover { transform: scale(1.08); border-color: var(--accent); }
.color-swatch.active { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,130,246,0.45); }

/* Fundos prontos */
.preset-bgs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.preset-thumb {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 6px;
  border: 2px solid var(--border);
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.12s, border-color 0.12s;
}

.preset-thumb:hover { transform: scale(1.06); border-color: var(--accent); }
.preset-thumb.active { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,130,246,0.45); }
.preset-thumb canvas { width: 100%; height: 100%; display: block; }

.multi-size-list label {
  display: flex !important;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--text);
  margin-bottom: 5px;
  cursor: pointer;
}

.bottom-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 24px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
}

.upload-zone {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

.file-name {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 110px;
}

.btn-primary, .btn-generate {
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary:hover, .btn-generate:hover { background: var(--accent-hover); }

.btn-generate {
  padding: 13px 24px;
  font-size: 0.95rem;
  box-shadow: 0 4px 18px rgba(59,130,246,0.35);
  white-space: nowrap;
}

.btn-generate:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}

.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-upload {
  background: var(--bg-card);
  border: 1px dashed var(--border);
  color: var(--text);
  padding: 9px 14px;
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
  font-size: 0.88rem;
}

.btn-upload:hover { border-color: var(--accent); color: var(--accent); }

.btn-random {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border: none;
  color: white;
  padding: 9px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}

.btn-random:hover { filter: brightness(1.12); }
.btn-random:disabled { opacity: 0.6; }

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal.open { display: flex; }

.modal-content {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 26px;
  width: 420px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-content h3 { margin-bottom: 4px; }
.modal-content input[type="file"],
.modal-content select { width: 100%; }

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 6px;
}

.toast {
  position: fixed;
  bottom: 110px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 12px 22px;
  border-radius: 8px;
  opacity: 0;
  transition: all 0.3s;
  z-index: 200;
  pointer-events: none;
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { border-color: var(--danger); color: var(--danger); }
.toast.success { border-color: var(--success); color: var(--success); }

@media (max-width: 900px) {
  .main { grid-template-columns: 1fr; }
  .controls-panel { display: none; }
  .preview-area { grid-template-columns: 1fr; }
}