/* CSS Variables for Theming */
:root {
    /* Colors - Dark Theme */
    --bg-primary: #0B0F1A;
    --bg-secondary: #151922;
    --bg-tertiary: #1E232E;
    --bg-glass: rgba(30, 35, 46, 0.7);

    --text-primary: #FFFFFF;
    --text-secondary: #A0AEC0;
    --text-tertiary: #718096;

    --primary: #6366F1;
    --primary-hover: #7C3AED;
    --accent: #84CC16;
    --accent-hover: #65A30D;

    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(255, 255, 255, 0.2);

    --success: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;
    --info: #3B82F6;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.4);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Light Theme */
.light-theme {
    --bg-primary: #F7FAFC;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #EDF2F7;
    --bg-glass: rgba(255, 255, 255, 0.9);

    --text-primary: #1A202C;
    --text-secondary: #4A5568;
    --text-tertiary: #718096;

    --border-color: rgba(0, 0, 0, 0.1);
    --border-hover: rgba(0, 0, 0, 0.2);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.15);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Top Bar */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    gap: var(--spacing-lg);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 200px;
}

.logo {
    font-size: 2rem;
    line-height: 1;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.brand-tagline {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1;
}

.format-selector-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 1;
    justify-content: center;
    max-width: 600px;
}

.format-select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 180px;
}

.format-select:hover {
    border-color: var(--border-hover);
    background: var(--bg-secondary);
}

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

.arrow-indicator {
    color: var(--accent);
    font-size: 1.5rem;
    font-weight: 700;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.performance-meter {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.offline-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    color: var(--success);
}

.offline-badge.offline {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: var(--error);
}

/* Main Layout */
.main-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    height: calc(100vh - 73px - 50px);
    overflow: hidden;
}

/* Left Panel */
.left-panel {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.panel-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.section-title {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.text-btn {
    background: transparent;
    border: none;
    color: var(--primary);
    font-size: 0.75rem;
    cursor: pointer;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.text-btn:hover:not(:disabled) {
    background: rgba(99, 102, 241, 0.1);
}

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

/* Dropzone */
.dropzone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    background: var(--bg-tertiary);
}

.dropzone:hover,
.dropzone.drag-over {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
    transform: scale(1.02);
}

.dropzone.drag-over {
    animation: ripple 0.6s ease-out;
}

@keyframes ripple {
    0% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.4);
    }
    100% {
        box-shadow: 0 0 0 20px rgba(99, 102, 241, 0);
    }
}

.dropzone-icon {
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.dropzone-text {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

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

.supported-formats {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.75rem;
}

/* Queue */
.queue-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 400px;
    overflow-y: auto;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.queue-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
    cursor: grab;
}

.queue-item:hover {
    border-color: var(--border-hover);
    transform: translateX(4px);
}

.queue-item-handle {
    color: var(--text-tertiary);
    cursor: grab;
}

.queue-item-info {
    flex: 1;
    min-width: 0;
}

.queue-item-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.queue-item-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    gap: var(--spacing-sm);
}

.queue-item-remove {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.queue-item-remove:hover {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

/* History */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 300px;
    overflow-y: auto;
}

.history-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--success);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.history-item:hover {
    border-color: var(--border-hover);
    background: var(--bg-secondary);
    transform: translateX(4px);
}

.history-item-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: var(--spacing-xs);
}

.history-item-meta {
    font-size: 0.65rem;
    color: var(--text-tertiary);
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

/* Format Options Modal */
.format-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--spacing-sm);
    max-height: 400px;
    overflow-y: auto;
}

.format-option {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    text-align: center;
    position: relative;
}

.format-option:hover:not(.disabled):not(.completed) {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
    transform: scale(1.05);
}

.format-option.selected {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

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

.format-option.completed {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.05);
    cursor: default;
}

.format-option-icon {
    font-size: 2rem;
}

.format-option-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
}

.format-option-desc {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.format-option-badge {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    background: var(--success);
    color: white;
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

/* Presets */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.preset-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    text-align: center;
}

.preset-btn:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
}

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

.preset-name {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Work Area */
.work-area {
    background: var(--bg-primary);
    overflow-y: auto;
    padding: var(--spacing-xl);
}

/* Welcome State */
.welcome-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.welcome-illustration {
    margin-bottom: var(--spacing-xl);
    color: var(--primary);
    opacity: 0.5;
}

.welcome-state h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.welcome-text {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 400px;
}

.cta-button {
    background: var(--primary);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.cta-button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.cta-button:active {
    transform: translateY(0);
}

.privacy-notice {
    margin-top: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* Conversion Container */
.conversion-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

/* Conversion Card */
.conversion-card {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.card-close {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.card-close:hover {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

/* File Preview */
.file-preview {
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.preview-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: var(--radius-md);
}

.preview-placeholder {
    text-align: center;
    color: var(--text-tertiary);
}

.preview-placeholder svg {
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* Options Panel */
.options-panel {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.option-value {
    color: var(--text-secondary);
    font-weight: 400;
}

.option-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-family);
    transition: all var(--transition-fast);
}

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

.option-slider {
    width: 100%;
    height: 6px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
}

.option-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.option-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-glow);
}

.option-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
}

.option-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-glow);
}

.option-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.option-checkbox input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Convert Button */
.convert-button {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    margin: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    position: relative;
    overflow: hidden;
}

.convert-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.convert-button:active:not(:disabled) {
    transform: translateY(0);
}

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

.convert-button.converting {
    animation: glow 2s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.4); }
    50% { box-shadow: 0 0 30px rgba(99, 102, 241, 0.6); }
}

/* Progress Section */
.progress-section {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.progress-ring-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.progress-ring {
    position: relative;
    width: 120px;
    height: 120px;
}

.progress-ring svg {
    transform: rotate(-90deg);
}

.progress-ring-circle-bg {
    fill: none;
    stroke: var(--bg-tertiary);
    stroke-width: 8;
}

.progress-ring-circle {
    fill: none;
    stroke: var(--primary);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.3s ease;
}

.progress-percentage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.progress-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    width: 100%;
}

.progress-stat {
    text-align: center;
}

.progress-stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.progress-stat-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.cancel-button {
    background: transparent;
    border: 1px solid var(--error);
    color: var(--error);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.cancel-button:hover {
    background: var(--error);
    color: white;
}

/* Result Section */
.result-section {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    animation: fadeIn 0.5s ease;
}

.result-success {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.success-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-md);
    animation: scaleIn 0.5s ease;
}

@keyframes scaleIn {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.action-btn {
    flex: 1;
    min-width: 150px;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.action-btn-primary {
    background: var(--primary);
    color: white;
    border: none;
}

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

.action-btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.action-btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-hover);
}

/* Toast System */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
}

.toast {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.toast-icon {
    font-size: 1.25rem;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

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

.toast-close {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.toast-close:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--error); }
.toast.warning { border-left: 4px solid var(--warning); }
.toast.info { border-left: 4px solid var(--info); }

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: scaleIn 0.3s ease;
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.modal-body h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.modal-body h3:first-child {
    margin-top: 0;
}

.modal-body p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.modal-body ul {
    margin-left: var(--spacing-lg);
    color: var(--text-secondary);
}

.modal-body li {
    margin-bottom: var(--spacing-sm);
}

/* Footer */
.footer {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-xl);
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-layout {
        grid-template-columns: 280px 1fr;
    }

    .format-selector-container {
        max-width: 400px;
    }
}

@media (max-width: 768px) {
    .main-layout {
        grid-template-columns: 1fr;
    }

    .left-panel {
        position: fixed;
        left: -320px;
        top: 73px;
        bottom: 50px;
        width: 320px;
        z-index: 90;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-xl);
    }

    .left-panel.open {
        left: 0;
    }

    .top-bar {
        flex-wrap: wrap;
    }

    .format-selector-container {
        order: 3;
        width: 100%;
        max-width: 100%;
    }

    .header-actions {
        flex-wrap: wrap;
    }

    .offline-badge span {
        display: none;
    }

    .preset-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 480px) {
    .top-bar {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .brand-name {
        font-size: 1rem;
    }

    .format-select {
        min-width: 140px;
        font-size: 0.75rem;
    }

    .preset-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .progress-stats {
        grid-template-columns: 1fr;
    }

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

    .action-btn {
        width: 100%;
    }

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        max-width: calc(100% - 2 * var(--spacing-md));
    }
}

/* Accessibility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus Styles */
*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
    outline-offset: 4px;
}

/* Loading Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Error State */
.error-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--error);
}

.error-state svg {
    margin-bottom: var(--spacing-md);
}

.error-message {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.retry-button {
    background: var(--error);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.retry-button:hover {
    background: #DC2626;
    transform: translateY(-2px);
}