:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a25;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #2d2d3a;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
}

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

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  font-size: 1.5rem;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 600;
}

.version {
  background: var(--accent);
  color: white;
  padding: 0.125rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

.nav {
  display: flex;
  gap: 0.5rem;
}

.nav-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-btn:hover,
.nav-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.main {
  display: flex;
  flex: 1;
  gap: 1rem;
  padding: 1rem;
}

.sidebar {
  width: 280px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
}

.panel h3 {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.info-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem;
}

.label {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.value {
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.feature {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.check {
  color: var(--success);
}

.btn {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

.btn:hover {
  background: var(--border);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
}

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

.btn.danger {
  border-color: var(--danger);
  color: var(--danger);
}

.btn.danger:hover {
  background: var(--danger);
  color: white;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn:disabled:hover {
  background: var(--bg-tertiary);
}

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

.control-group {
  margin-bottom: 1rem;
}

.control-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.control-group input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-tertiary);
  outline: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.control-group input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.viewer {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
}

.dropzone {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  min-height: 400px;
  border: 2px dashed var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.dropzone:hover,
.dropzone.drag-over {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.1);
}

.dropzone-content {
  text-align: center;
}

.dropzone-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.dropzone-text {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.dropzone-hint {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.dropzone input {
  display: none;
}

.canvas-wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.canvas-wrapper canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.loading {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

#histogram {
  width: 100%;
  height: 60px;
  background: var(--bg-tertiary);
  border-radius: 4px;
}

.footer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.separator {
  opacity: 0.5;
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 1rem 2rem;
  border-radius: 8px;
  opacity: 0;
  transition: all 0.3s;
}

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

.toast.success {
  border-color: var(--success);
}

.toast.error {
  border-color: var(--danger);
}