body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

.hero-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.upload-area {
    border: 3px dashed #cbd5e0;
    transition: all 0.3s ease;
}

.upload-area.dragover {
    border-color: #667eea;
    background-color: #f7fafc;
    transform: scale(1.02);
}

.upload-area:hover {
    border-color: #a0aec0;
}

.cta-banner {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.feature-icon {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Format Selection Buttons */
.format-btn {
    background: white;
    border: 2px solid #e2e8f0;
    padding: 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
    color: #4a5568;
    transition: all 0.2s ease;
    cursor: pointer;
    text-align: center;
}

.format-btn:hover {
    border-color: #667eea;
    color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.format-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-color: #667eea;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.format-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Quality Selection Buttons */
.quality-btn {
    background: white;
    border: 2px solid #e2e8f0;
    padding: 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
    color: #4a5568;
    transition: all 0.2s ease;
    cursor: pointer;
    text-align: center;
}

.quality-btn:hover {
    border-color: #667eea;
    color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.quality-btn.active {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-color: #10b981;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

/* Progress Bar */
.progress-bar-container {
    width: 100%;
    height: 12px;
    background: #e2e8f0;
    border-radius: 6px;
    overflow: hidden;
    position: relative;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    border-radius: 6px;
    width: 0%;
    transition: width 0.3s ease;
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.3) 50%,
        rgba(255, 255, 255, 0) 100%
    );
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* Audio Players */
audio {
    width: 100%;
    border-radius: 8px;
    outline: none;
}

audio::-webkit-media-controls-panel {
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
}

/* Responsive Utilities */
@media (max-width: 768px) {
    .format-btn,
    .quality-btn {
        font-size: 0.875rem;
        padding: 0.75rem;
    }
}

/* Loading Spinner */
.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    display: inline-block;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Fade In Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* Success Checkmark Animation */
@keyframes checkmark {
    0% {
        transform: scale(0);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
    }
}

.checkmark-animation {
    animation: checkmark 0.5s ease-out;
}

/* Error State */
.error-message {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    border-left: 4px solid #ef4444;
    padding: 1rem;
    border-radius: 0.5rem;
    color: #991b1b;
    font-weight: 600;
}

/* Info Box */
.info-box {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    border-left: 4px solid #3b82f6;
    padding: 1rem;
    border-radius: 0.5rem;
    color: #1e40af;
}

/* Success Box */
.success-box {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    border-left: 4px solid #10b981;
    padding: 1rem;
    border-radius: 0.5rem;
    color: #065f46;
}

/* Hover Effects */
.hover-lift {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}