:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --surface: rgba(255, 255, 255, 0.05);
    --surface-hover: rgba(255, 255, 255, 0.08);
    --border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 30px 80px rgba(0, 0, 0, 0.4);
    --radius: 16px;
    --radius-sm: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f3f5;
    --surface: rgba(0, 0, 0, 0.03);
    --surface-hover: rgba(0, 0, 0, 0.06);
    --border: rgba(0, 0, 0, 0.1);
    --text-primary: #1a1a2e;
    --text-secondary: rgba(0, 0, 0, 0.7);
    --text-tertiary: rgba(0, 0, 0, 0.5);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 30px 80px rgba(0, 0, 0, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
    transition: var(--transition);
}

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

.app-header {
    background: var(--bg-secondary);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0 env(safe-area-inset-right) 0 env(safe-area-inset-left);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 32px;
    height: 32px;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    gap: 8px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--surface);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.icon-btn svg {
    width: 20px;
    height: 20px;
    position: relative;
    z-index: 1;
}

.icon-btn:hover {
    background: var(--surface-hover);
    transform: scale(1.05);
}

.icon-btn:active {
    transform: scale(0.95);
}

.app-main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 20px;
}

.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--surface);
    border-radius: var(--radius-sm);
    margin-bottom: 24px;
    border: 1px solid var(--border);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-tertiary);
    animation: pulse 2s infinite;
}

.status-dot.ready {
    background: var(--success);
}

.status-dot.processing {
    background: var(--warning);
}

.status-dot.error {
    background: var(--error);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.gpu-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: var(--success);
}

.gpu-badge svg {
    width: 16px;
    height: 16px;
}

.glass-card {
    background: var(--bg-secondary);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.glass-card:hover {
    box-shadow: var(--shadow-lg);
}

.upload-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

.upload-card {
    text-align: center;
    max-width: 500px;
    width: 100%;
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    stroke: var(--text-tertiary);
}

.upload-card h2 {
    font-size: 28px;
    margin-bottom: 12px;
}

.upload-card p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.primary-btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 14px 32px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    position: relative;
    overflow: hidden;
}

.primary-btn svg {
    width: 20px;
    height: 20px;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.primary-btn:active {
    transform: translateY(0);
}

.primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.secondary-btn {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 14px 32px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.secondary-btn:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
}

.secondary-btn:active {
    transform: translateY(0);
}

.controls-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.video-preview {
    overflow: hidden;
}

.video-preview video {
    width: 100%;
    border-radius: var(--radius-sm);
    background: #000;
}

.video-info {
    margin-top: 16px;
    padding: 12px;
    background: var(--surface);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-secondary);
}

.settings-group {
    margin-bottom: 20px;
}

.settings-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-secondary);
}

.select-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
}

.select-input:hover {
    background: var(--surface-hover);
}

.select-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.slider {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--surface);
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
    transition: var(--transition);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.4);
}

.slider-value {
    min-width: 50px;
    text-align: right;
    font-weight: 600;
    color: var(--text-primary);
}

.progress-card {
    display: none;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.progress-header h3 {
    font-size: 18px;
}

.progress-header span {
    font-weight: 700;
    color: #667eea;
}

.progress-bar {
    height: 8px;
    background: var(--surface);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: var(--primary-gradient);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-card p {
    font-size: 14px;
    color: var(--text-secondary);
}

.result-card {
    display: none;
    text-align: center;
}

.result-card h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

.result-card video {
    width: 100%;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    background: #000;
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    width: 100%;
    max-width: 500px;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    font-size: 24px;
}

.close-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: var(--surface);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.close-btn svg {
    width: 18px;
    height: 18px;
}

.close-btn:hover {
    background: var(--surface-hover);
    transform: rotate(90deg);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
}

.search-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 16px;
    margin-bottom: 16px;
}

.search-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.language-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.language-item {
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 12px;
}

.language-item:hover {
    background: var(--surface-hover);
    transform: translateX(4px);
}

.language-item.active {
    background: rgba(102, 126, 234, 0.1);
    border-color: #667eea;
}

.language-code {
    padding: 4px 8px;
    background: var(--surface);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-tertiary);
    min-width: 40px;
    text-align: center;
}

.language-name {
    flex: 1;
    font-size: 16px;
}

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

.about-logo {
    margin-bottom: 20px;
}

.about-logo svg {
    width: 80px;
    height: 80px;
    margin: 0 auto 12px;
}

.about-logo h3 {
    font-size: 32px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-content > p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.about-features {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
    justify-content: center;
}

.feature-item {
    flex: 1;
    min-width: 120px;
    padding: 16px;
    background: var(--surface);
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.feature-item svg {
    width: 32px;
    height: 32px;
    stroke: #667eea;
}

.feature-item span {
    font-size: 14px;
    font-weight: 600;
}

.developer-info {
    padding: 20px;
    background: var(--surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.developer-info > p:first-child {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.developer-name {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.developer-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.dev-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.dev-link svg {
    width: 18px;
    height: 18px;
}

.dev-link:hover {
    background: var(--surface-hover);
    transform: translateX(4px);
}

[dir="rtl"] .language-item:hover,
[dir="rtl"] .dev-link:hover {
    transform: translateX(-4px);
}

@media (max-width: 768px) {
    .app-main {
        padding: 16px;
    }

    .glass-card {
        padding: 20px;
    }

    .logo-text {
        font-size: 20px;
    }

    .upload-card h2 {
        font-size: 24px;
    }

    .primary-btn,
    .secondary-btn {
        width: 100%;
        justify-content: center;
    }

    .result-actions {
        flex-direction: column;
    }

    .about-features {
        flex-direction: column;
    }

    .feature-item {
        min-width: 100%;
    }
}