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

:root {
  --bg-deep: #0d0d14;
  --bg-base: #13131f;
  --bg-surface: #1c1c2e;
  --bg-raised: #252540;
  --border: #2f2f4a;
  --border-hover: #45456a;
  --text-primary: #eeeef5;
  --text-secondary: #a8a8c4;
  --text-muted: #707090;
  --accent: #00c8e0;
  --accent-hover: #00e5ff;
  --accent-glow: rgba(0, 200, 224, 0.3);
  --accent-subtle: rgba(0, 200, 224, 0.1);
  --green: #00e676;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition: 0.2s ease;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  padding: 14px 24px;
  background: var(--bg-base);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.logo {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #00c8e0, #0090ff);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.logo svg { width: 20px; height: 20px; color: #fff; }

.header-text h1 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  line-height: 1.2;
}

.header-text .hint {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.2;
}

.header-right { flex-shrink: 0; }

.shortcut-hint {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}

.shortcut-hint kbd {
  display: inline-block;
  padding: 1px 5px;
  font-size: 10px;
  font-family: inherit;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Main layout */
main {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* Canvas area */
.canvas-area {
  flex: 1;
  min-width: 0;
  position: relative;
  overflow: hidden;
  background: var(--bg-deep);
  background-image:
    linear-gradient(45deg, #151522 25%, transparent 25%),
    linear-gradient(-45deg, #151522 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #151522 75%),
    linear-gradient(-45deg, transparent 75%, #151522 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
}

#mainCanvas {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: crosshair;
}

/* Drop overlay */
.drop-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(13, 13, 20, 0.92);
  z-index: 10;
  transition: opacity 0.25s;
  cursor: pointer;
}

.drop-overlay.hidden { display: none; }

.drop-icon-ring {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 2px dashed var(--border-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  transition: all var(--transition);
  animation: pulse-ring 2.5s ease-in-out infinite;
}

@keyframes pulse-ring {
  0%, 100% { border-color: var(--border-hover); transform: scale(1); }
  50% { border-color: var(--accent); transform: scale(1.05); }
}

.drop-icon-ring svg {
  width: 32px;
  height: 32px;
  stroke: var(--text-muted);
  transition: stroke var(--transition);
}

.drop-overlay:hover .drop-icon-ring {
  border-color: var(--accent);
  background: var(--accent-subtle);
}

.drop-overlay:hover .drop-icon-ring svg { stroke: var(--accent); }

.drop-title { font-size: 15px; font-weight: 500; color: var(--text-secondary); margin-bottom: 6px; }
.drop-sub { font-size: 13px; color: var(--text-muted); }

/* Sidebar */
.sidebar {
  width: 380px;
  background: var(--bg-base);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* Panels */
.panel {
  padding: 16px;
  border-bottom: 1px solid var(--border);
}

.panel-preview {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.panel-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.panel-icon { width: 14px; height: 14px; opacity: 0.6; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 14px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

.btn-full { width: 100%; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #0090ff);
  color: #fff;
  box-shadow: 0 2px 8px var(--accent-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--accent-hover), #1aa0ff);
  box-shadow: 0 4px 16px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: var(--bg-raised);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  background: var(--bg-surface);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.btn-row { display: flex; gap: 8px; margin-top: 8px; }
.btn-row .btn { flex: 1; }

/* Field grid */
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.field-full { grid-column: 1 / -1; }

.field {
  display: flex;
  align-items: center;
  gap: 6px;
}

.field label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  width: 50px;
  flex-shrink: 0;
  text-align: right;
}

.field input[type="number"],
.field select {
  flex: 1;
  width: 100%;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 8px;
  color: var(--text-primary);
  font-size: 13px;
  font-family: "SF Mono", "Menlo", "Cascadia Code", monospace;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.field select {
  font-family: inherit;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23707090'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 24px;
}

.field select option {
  background: var(--bg-base);
  color: var(--text-primary);
}

.field input[type="number"]:focus,
.field select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; }

/* Range slider */
.field input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--bg-raised);
  border-radius: 2px;
  outline: none;
}

.field input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 6px var(--accent-glow);
}

.range-val {
  font-size: 12px;
  font-family: "SF Mono", "Menlo", monospace;
  color: var(--text-muted);
  min-width: 36px;
  text-align: right;
}

/* Size presets */
.size-presets { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }

.preset-btn {
  padding: 5px 0;
  flex: 1;
  min-width: 70px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 11px;
  font-family: "SF Mono", "Menlo", monospace;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.preset-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

.preset-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 2px 6px var(--accent-glow);
}

/* Percent row */
.percent-row {
  margin-top: 10px;
}

.field-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: block;
}

.percent-btns {
  display: flex;
  gap: 4px;
}

.pct-btn {
  flex: 1;
  padding: 5px 0;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 11px;
  font-family: "SF Mono", "Menlo", monospace;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.pct-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

.pct-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 2px 6px var(--accent-glow);
}

/* Aspect row */
.aspect-row {
  margin-top: 10px;
}

.aspect-btns {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.aspect-btn {
  padding: 5px 10px;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 11px;
  font-family: "SF Mono", "Menlo", monospace;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}

.aspect-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

.aspect-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 2px 6px var(--accent-glow);
}

/* Toggle switch */
.lock-row { margin-top: 10px; }

.toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.toggle-label input { display: none; }

.toggle-switch {
  width: 32px;
  height: 18px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 9px;
  position: relative;
  transition: all var(--transition);
  flex-shrink: 0;
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--transition);
}

.toggle-label input:checked + .toggle-switch {
  background: var(--accent);
  border-color: var(--accent);
}

.toggle-label input:checked + .toggle-switch::after {
  left: 16px;
  background: #fff;
}

.toggle-text { font-size: 12px; color: var(--text-muted); }

/* Image info */
.image-info {
  font-size: 12px;
  color: var(--text-muted);
  font-family: "SF Mono", "Menlo", monospace;
  margin-top: 10px;
}

/* Preview area */
.preview-area {
  flex: 1;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-deep);
  background-image:
    linear-gradient(45deg, #151522 25%, transparent 25%),
    linear-gradient(-45deg, #151522 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #151522 75%),
    linear-gradient(-45deg, transparent 75%, #151522 75%);
  background-size: 12px 12px;
  background-position: 0 0, 0 6px, 6px -6px, -6px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}

.preview-area canvas {
  max-width: 100%;
  max-height: 100%;
}

.preview-empty { font-size: 12px; color: var(--text-muted); }

/* Output info */
.output-info {
  font-size: 11px;
  color: var(--text-muted);
  font-family: "SF Mono", "Menlo", monospace;
  margin-top: 8px;
  text-align: center;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-surface);
  color: var(--text-primary);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 100;
  pointer-events: none;
  border: 1px solid var(--border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Mobile */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 16px;
    gap: 8px;
  }

  .header-right { display: none; }

  main { flex-direction: column; }

  .canvas-area { min-height: 280px; }

  .sidebar {
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--border);
    overflow-y: visible;
    max-height: none;
  }

  .panel-preview { flex: 0; }
  .preview-area { min-height: 120px; }
}