:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #232733;
  --border: #2d3140;
  --text: #e8eaed;
  --muted: #8b8fa3;
  --accent: #4f8cff;
  --accent2: #6c5ce7;
  --success: #2ed573;
  --warning: #ffa502;
  --danger: #ff4757;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
}

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

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

.app {
  display: grid;
  grid-template-columns: 340px 1fr;
  grid-template-rows: 56px 1fr;
  height: 100vh;
  overflow: hidden;
}

/* Header */
.header {
  grid-column: 1 / -1;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 10;
}

.header h1 {
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.header h1 span { font-size: 20px; }

.lang-switch {
  display: flex;
  gap: 4px;
}

.lang-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  transition: all .2s;
}

.lang-btn:hover { border-color: var(--accent); color: var(--text); }
.lang-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Sidebar */
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.section {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
}

.section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--muted);
  margin-bottom: 10px;
}

/* Type Grid */
.type-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.type-card {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 10px 6px;
  text-align: center;
  cursor: pointer;
  transition: all .2s;
  font-size: 11px;
  color: var(--muted);
}

.type-card:hover { border-color: var(--accent); color: var(--text); }
.type-card.active { border-color: var(--accent); background: rgba(79,140,255,.1); color: var(--accent); }
.type-card .icon { font-size: 24px; display: block; margin-bottom: 4px; }

/* Sliders */
.slider-group {
  margin-bottom: 10px;
}

.slider-group:last-child { margin-bottom: 0; }

.slider-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.slider-value {
  color: var(--accent);
  font-weight: 600;
  font-size: 13px;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(79,140,255,.4);
}

/* Color picker */
.color-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.color-row:last-child { margin-bottom: 0; }

.color-row label {
  font-size: 12px;
  color: var(--muted);
  flex: 1;
}

.color-row input[type="color"] {
  width: 32px;
  height: 24px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  padding: 0;
}

/* Checkbox */
.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  margin-bottom: 6px;
}

.check-row:last-child { margin-bottom: 0; }
.check-row input { accent-color: var(--accent); }

/* Button */
.btn {
  width: 100%;
  background: rgba(255,255,255,.05);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 8px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12px;
  transition: all .2s;
}

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

/* Viewer */
.viewer {
  position: relative;
  background: var(--bg);
  overflow: hidden;
}

.viewer canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.viewer-hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,.6);
  color: var(--muted);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 11px;
  pointer-events: none;
  opacity: .7;
}

/* Info badge */
.info-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(0,0,0,.7);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 11px;
  line-height: 1.6;
}

/* Responsive */
@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: 56px 50vh auto;
    overflow-y: auto;
  }

  .sidebar {
    order: 2;
    flex-direction: column;
    overflow-y: auto;
    padding: 10px;
    gap: 8px;
    max-height: none;
  }

  .section { min-width: auto; flex-shrink: 0; }
  .viewer { order: 1; min-height: 50vh; }
}

/* Button active state */
.btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}