:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #f1f5f9;
    --accent-color: #10b981;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --background: #ffffff;
    --surface: #f8fafc;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-subtle: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--surface);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    text-align: center;
    padding: 60px 0 40px;
    position: relative;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: var(--gradient);
    border-radius: 2px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.logo i {
    font-size: 2.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Upload Section */
.upload-section {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.upload-area {
    background: var(--background);
    border: 2px dashed var(--border);
    border-radius: 20px;
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.5s ease;
}

.upload-area:hover::before {
    left: 100%;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.02);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    transform: scale(1.02);
}

.upload-icon {
    margin-bottom: 20px;
}

.upload-icon i {
    font-size: 4rem;
    color: var(--primary-color);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.upload-area h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.file-types {
    display: inline-block;
    background: var(--secondary-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Settings Panel */
.settings-panel {
    background: var(--background);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.setting-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-group input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--background);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-suffix {
    position: absolute;
    right: 16px;
    color: var(--text-secondary);
    font-weight: 500;
    pointer-events: none;
}

/* Processing Section */
.processing-section {
    background: var(--background);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.file-info {
    margin-bottom: 30px;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 15px;
}

.file-details i {
    font-size: 2rem;
    color: var(--primary-color);
}

.file-details h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.file-details p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Progress Bar */
.progress-container {
    margin-bottom: 30px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.progress-header span {
    font-weight: 500;
}

.progress-bar {
    height: 8px;
    background: var(--secondary-color);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: var(--gradient);
    border-radius: 4px;
    transition: width 0.3s ease;
    position: relative;
}

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

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

/* Compression Stats */
.compression-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 20px;
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Result Section */
.result-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.result-card {
    background: var(--background);
    border-radius: 24px;
    padding: 50px 40px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    max-width: 500px;
    width: 100%;
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-icon {
    margin-bottom: 20px;
}

.result-icon i {
    font-size: 4rem;
    color: var(--accent-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.result-card h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.result-card > p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.result-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.result-stat {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 15px;
    background: var(--surface);
    border-radius: 12px;
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.result-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--background);
    color: var(--text-primary);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px 0;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header {
        padding: 40px 0 30px;
    }
    
    .logo {
        flex-direction: column;
        gap: 10px;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .settings-panel {
        padding: 20px;
    }
    
    .processing-section {
        padding: 30px 20px;
    }
    
    .result-card {
        padding: 40px 20px;
    }
    
    .compression-stats {
        grid-template-columns: 1fr;
    }
    
    .result-stats {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .upload-area {
        padding: 30px 15px;
    }
    
    .upload-icon i {
        font-size: 3rem;
    }
    
    .upload-area h2 {
        font-size: 1.3rem;
    }
    
    .result-icon i {
        font-size: 3rem;
    }
    
    .result-card h2 {
        font-size: 1.5rem;
    }
}