/* Universal Media Downloader - Enhanced Styles */
/* Based on Dark Mode First Design with High Contrast */

/* CSS Custom Properties */
:root {
    /* Colors - Dark Mode First */
    --primary-100: #A5F3FC;
    --primary-500: #06B6D4;
    --primary-700: #0E7490;
    --bg-page: #000000;
    --bg-surface: #141414;
    --border-default: #262626;
    --text-primary: #E4E4E7;
    --text-secondary: #A3A3A3;
    --text-heading: #FAFAFA;
    --success: #22C55E;
    --warning: #FBBF24;
    --error: #F43F5E;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Spacing (4px Grid System) */
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-xxl: 48px;
    --space-xxxl: 64px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    
    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-normal: 200ms ease-out;
    --transition-slow: 300ms cubic-bezier(0.25, 1, 0.5, 1);
    
    /* Shadows */
    --shadow-focus: 0 0 0 3px rgba(6, 182, 212, 0.4);
    --shadow-hover: 0 0 12px 0 rgba(6, 182, 212, 0.2);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-page);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--space-xl);
}

/* Header */
.app-header {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin-bottom: var(--space-xl);
}

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

.app-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-heading);
    margin: 0;
}

.header-controls {
    display: flex;
    gap: var(--space-sm);
}

.icon-btn {
    width: 48px;
    height: 48px;
    background: transparent;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
}

.icon-btn:hover {
    border-color: var(--primary-500);
    color: var(--primary-500);
    box-shadow: var(--shadow-hover);
}

.icon-btn:focus {
    outline: none;
    box-shadow: var(--shadow-focus);
}

.icon {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

/* Main Content */
.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    padding-bottom: 80px; /* Space for bottom nav on mobile */
}

/* Section Styles */
.section-title {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-heading);
    margin-bottom: var(--space-md);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
}

/* Input Section */
.input-section {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

.url-form {
    margin: 0;
}

.input-group {
    margin-bottom: var(--space-sm);
}

.input-label {
    display: block;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-heading);
    margin-bottom: var(--space-xs);
}

.url-input-container {
    display: flex;
    gap: var(--space-sm);
    align-items: stretch;
}

.url-input {
    flex: 1;
    height: 56px;
    background: var(--bg-page);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 16px;
    padding: 0 var(--space-md);
    transition: all var(--transition-normal);
}

.url-input::placeholder {
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.url-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--shadow-focus);
}

.analyze-btn {
    min-width: 120px;
    height: 56px;
    background: var(--primary-500);
    color: var(--text-heading);
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-slow);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    position: relative;
    overflow: hidden;
}

.analyze-btn:hover {
    background: var(--primary-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.analyze-btn:active {
    transform: translateY(0);
    background: var(--primary-700);
}

.analyze-btn:focus {
    outline: none;
    box-shadow: var(--shadow-focus);
}

.analyze-btn:disabled {
    background: var(--border-default);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-loading {
    display: none;
}

.analyze-btn.loading .btn-text {
    display: none;
}

.analyze-btn.loading .btn-loading {
    display: flex;
    align-items: center;
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

.path {
    stroke-dasharray: 90, 150;
    stroke-dashoffset: 0;
    stroke-linecap: round;
    animation: dash 1.5s ease-in-out infinite;
}

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

@keyframes dash {
    0% {
        stroke-dasharray: 1, 150;
        stroke-dashoffset: 0;
    }
    50% {
        stroke-dasharray: 90, 150;
        stroke-dashoffset: -35;
    }
    100% {
        stroke-dashoffset: -124;
    }
}

.help-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Status Section */
.status-section {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

.status-container {
    min-height: 60px;
}

.status-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.status-icon {
    font-size: 18px;
}

.status-text {
    color: var(--text-primary);
    line-height: 1.5;
}

/* Progress Section */
.progress-section {
    margin-top: var(--space-md);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.progress-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.progress-speed {
    font-size: 14px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.progress-bar-container {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border-default);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar::-webkit-progress-bar {
    background: var(--border-default);
    border-radius: 4px;
}

.progress-bar::-webkit-progress-value {
    background: var(--primary-500);
    border-radius: 4px;
    transition: width var(--transition-normal);
}

.progress-bar::-moz-progress-bar {
    background: var(--primary-500);
    border-radius: 4px;
}

.progress-percentage {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    min-width: 40px;
    text-align: right;
}

/* Media Info Section */
.media-info-section {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

.media-info {
    display: flex;
    gap: var(--space-lg);
    align-items: flex-start;
}

.media-thumbnail {
    flex-shrink: 0;
    width: 120px;
    height: 80px;
    background: var(--bg-page);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.media-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.placeholder-icon {
    width: 32px;
    height: 32px;
    fill: var(--text-secondary);
}

.media-details {
    flex: 1;
    min-width: 0;
}

.media-title {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-heading);
    margin-bottom: var(--space-xs);
    word-wrap: break-word;
}

.media-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
    align-items: center;
}

.media-uploader {
    font-size: 14px;
    color: var(--text-secondary);
}

.platform-badge {
    background: var(--primary-500);
    color: var(--text-heading);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
}

.duration {
    font-size: 14px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.media-stats {
    display: flex;
    gap: var(--space-md);
}

.stat-item {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Formats Section */
.formats-section {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

.format-filters {
    display: flex;
    gap: var(--space-xs);
}

.filter-btn {
    padding: var(--space-xs) var(--space-sm);
    background: transparent;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.filter-btn:hover {
    border-color: var(--primary-500);
    color: var(--primary-500);
}

.filter-btn.active {
    background: var(--primary-500);
    color: var(--text-heading);
    border-color: var(--primary-500);
}

.format-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.format-item {
    background: var(--bg-page);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 72px;
}

.format-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary-500);
    transform: translateY(-1px);
}

.format-item:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--shadow-focus);
}

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

.format-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-heading);
    line-height: 1.3;
    margin-bottom: 2px;
    word-wrap: break-word;
}

.format-details {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.4;
    font-family: var(--font-mono);
}

.format-actions {
    display: flex;
    gap: var(--space-xs);
    align-items: center;
}

.format-item.downloading {
    background: var(--primary-500);
    color: var(--text-heading);
    border-color: var(--primary-500);
}

.format-item.completed {
    background: var(--success);
    color: var(--bg-page);
    border-color: var(--success);
}

.format-item.error {
    background: var(--error);
    color: var(--text-heading);
    border-color: var(--error);
}

/* Download Options Section */
.download-options-container {
    margin-top: var(--space-md);
}

.download-options-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.download-options-title::before {
    content: "⚠️";
    font-size: 20px;
}

.download-instruction {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    padding: var(--space-sm);
    background: rgba(255, 193, 7, 0.1);
    border: 1px solid rgba(255, 193, 7, 0.3);
    border-radius: var(--radius-sm);
    line-height: 1.4;
}

.download-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    margin-bottom: var(--space-sm);
    background: var(--bg-page);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-normal);
    font-size: 14px;
    font-weight: 500;
}

.download-link:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary-500);
    transform: translateY(-1px);
    color: var(--primary-500);
}

.download-link:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--shadow-focus);
}

.download-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    color: var(--primary-500);
    flex-shrink: 0;
}

.download-text-container {
    flex: 1;
    min-width: 0;
}

.download-text {
    font-weight: 500;
    color: var(--text-primary);
    word-break: break-all;
    margin-bottom: 2px;
}

.download-file-info {
    font-size: 12px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    word-break: break-all;
    opacity: 0.8;
}

/* Queue Section */
.queue-section {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

.queue-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.queue-item {
    background: var(--bg-page);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    min-height: 80px;
}

.queue-thumbnail {
    width: 64px;
    height: 40px;
    background: var(--border-default);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.queue-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

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

.queue-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-heading);
    line-height: 1.3;
    margin-bottom: 2px;
    word-wrap: break-word;
}

.queue-url {
    font-size: 12px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    word-wrap: break-word;
    overflow: hidden;
    text-overflow: ellipsis;
}

.queue-progress {
    width: 120px;
    text-align: center;
}

.queue-progress .progress-bar {
    height: 4px;
    margin-bottom: 4px;
}

.queue-status {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Error and Success Sections */
.error-section,
.success-section {
    background: rgba(244, 63, 94, 0.1);
    border: 1px solid var(--error);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

.success-section {
    background: rgba(34, 197, 94, 0.1);
    border-color: var(--success);
}

.error-container,
.success-container {
    min-height: 60px;
}

.error-item,
.success-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.error-item:last-child,
.success-item:last-child {
    margin-bottom: 0;
}

.error-icon {
    color: var(--error);
    font-size: 18px;
}

.success-icon {
    color: var(--success);
    font-size: 18px;
}

.error-text,
.success-text {
    font-size: 16px;
    line-height: 1.5;
}

/* Secondary Button */
.secondary-btn {
    padding: var(--space-xs) var(--space-md);
    background: transparent;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.secondary-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-heading);
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-default);
    display: none;
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
    z-index: 1000;
}

.nav-item {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.nav-item.active {
    background: var(--primary-500);
    color: var(--text-heading);
}

.nav-icon {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.nav-label {
    font-size: 12px;
    font-weight: 500;
}

/* Settings Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--space-md);
}

.modal-content {
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-heading);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-normal);
}

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

.modal-body {
    padding: var(--space-lg);
}

.setting-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.setting-label {
    font-size: 16px;
    color: var(--text-primary);
}

.toggle {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 24px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--border-default);
    border-radius: 24px;
    transition: var(--transition-normal);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: var(--text-primary);
    border-radius: 50%;
    transition: var(--transition-normal);
}

.toggle input:checked + .toggle-slider {
    background: var(--primary-500);
}

.toggle input:checked + .toggle-slider:before {
    transform: translateX(24px);
    background: var(--text-heading);
}

.setting-select {
    background: var(--bg-page);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: var(--space-xs) var(--space-sm);
    font-size: 14px;
    cursor: pointer;
}

.setting-select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: var(--shadow-focus);
}

.modal-footer {
    padding: var(--space-lg);
    border-top: 1px solid var(--border-default);
    display: flex;
    justify-content: flex-end;
}

.primary-btn {
    padding: var(--space-sm) var(--space-lg);
    background: var(--primary-500);
    color: var(--text-heading);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.primary-btn:hover {
    background: var(--primary-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}

.primary-btn:focus {
    outline: none;
    box-shadow: var(--shadow-focus);
}

/* Responsive Design */
@media (max-width: 767px) {
    .app-container {
        padding: var(--space-md);
    }
    
    .app-title {
        font-size: 32px;
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .url-input-container {
        flex-direction: column;
    }
    
    .analyze-btn {
        width: 100%;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
    
    .media-info {
        flex-direction: column;
        text-align: center;
    }
    
    .media-thumbnail {
        align-self: center;
    }
    
    .format-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
    
    .format-actions {
        align-self: flex-end;
    }
    
    .queue-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
    
    .queue-progress {
        width: 100%;
    }
    
    .bottom-nav {
        display: flex;
    }
    
    .app-main {
        padding-bottom: 100px; /* More space for bottom nav */
    }
}

@media (min-width: 768px) {
    .bottom-nav {
        display: none;
    }
    
    .app-main {
        padding-bottom: 0;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-default: #666666;
        --text-secondary: #CCCCCC;
    }
    
    .url-input,
    .analyze-btn,
    .format-item,
    .queue-item {
        border-width: 2px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .spinner {
        animation: none;
    }
    
    .path {
        animation: none;
    }
}

/* Print Styles */
@media print {
    .app-header,
    .bottom-nav,
    .icon-btn,
    .analyze-btn {
        display: none;
    }
    
    .app-container {
        padding: 0;
    }
    
    body {
        background: white;
        color: black;
    }
}