:root {
  --bg-main: #09090B;
  --bg-secondary: #111113;
  --bg-card: #18181B;
  --accent-primary: #3B82F6;
  --accent-hover: #2563EB;
  --success: #22C55E;
  --warning: #F59E0B;
  --error: #EF4444;
  --text-primary: #FFFFFF;
  --text-secondary: #A1A1AA;
  --border-color: #27272A;
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  overflow-x: hidden;
}

.layout {
  display: flex;
  height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
}

.sidebar {
  width: 260px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.workspace {
  flex: 1;
  padding: 40px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.history-panel {
  width: 320px;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  padding: 24px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

/* UI Elements */
.logo {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.subtitle {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  margin-bottom: 4px;
}
.nav-item:hover, .nav-item.active {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

.upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  background: var(--bg-card);
  margin-bottom: 24px;
}
.upload-zone:hover {
  border-color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.05);
}

textarea {
  width: 100%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  resize: vertical;
  min-height: 120px;
  transition: border-color 0.2s;
}
textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.btn-generate {
  width: 100%;
  padding: 16px;
  border-radius: 12px;
  border: none;
  background-color: var(--accent-primary);
  color: white;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 24px;
}
.btn-generate:hover {
  background-color: var(--accent-hover);
  transform: scale(1.02);
}
.btn-generate:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}
.btn-generate.generating {
  background: linear-gradient(90deg, var(--accent-primary), #8B5CF6, var(--accent-primary));
  background-size: 200% 100%;
  animation: pulseGradient 2s linear infinite;
}

.history-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
  font-size: 13px;
}
.history-item audio {
  width: 100%;
  margin-top: 8px;
  height: 30px;
}

@keyframes pulseGradient {
  0% { background-position: 0% 50%; }
  100% { background-position: -200% 50%; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
.animate-spin {
  animation: spin 1s linear infinite;
}

::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}