/*
 * Universal File Format Converter - Stylesheet
 * Modern, responsive design with dark/light theme support
 */

/* CSS Variables */
:root {
    /* Light theme colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --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, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

[data-theme="dark"] {
    /* Dark theme colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #4b5563;
    --primary-color: #60a5fa;
    --primary-hover: #3b82f6;
    --success-color: #34d399;
    --error-color: #f87171;
    --warning-color: #fbbf24;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    min-height: 100vh;
    position: relative;
}

/* Header */
.header {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 1.5rem 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

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

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--text-primary);
    font-size: 1.125rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Section Headers */
.section-header {
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header h2 i {
    color: var(--primary-color);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Upload Section */
.upload-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    background: var(--bg-tertiary);
}

.drop-zone:hover {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.05);
    transform: scale(1.02);
}

.drop-zone.dragover {
    border-color: var(--primary-color);
    background: rgba(59, 130, 246, 0.1);
    transform: scale(1.02);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.drop-zone-content {
    pointer-events: none;
}

.upload-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: block;
}

.drop-zone h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.drop-zone p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.file-input {
    display: none;
}

.browse-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    pointer-events: all;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-md);
}

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

/* File Info */
.file-info {
    margin-top: 1.5rem;
}

.file-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.file-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
}

.file-icon-wrapper {
    width: 50px;
    height: 50px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.file-details {
    flex: 1;
}

.file-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.file-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.file-meta-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.file-meta-item i {
    color: var(--primary-color);
}

.remove-file-btn {
    background: rgba(239, 68, 68, 0.1);
    border: none;
    color: var(--error-color);
    font-size: 1.125rem;
    cursor: pointer;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.remove-file-btn:hover {
    background: var(--error-color);
    color: white;
    transform: scale(1.1);
}

/* Conversion Section */
.conversion-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.format-controls {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.format-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.format-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.format-label i {
    color: var(--primary-color);
}

.format-select {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.875rem center;
    padding-right: 2.5rem;
}

.format-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.conversion-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 2rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(0);
    }
    40% {
        transform: translateX(10px);
    }
    60% {
        transform: translateX(5px);
    }
}

.conversion-options {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.checkbox-label:hover {
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all 0.3s ease;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 0.75rem;
    font-weight: bold;
}

.convert-btn {
    width: 100%;
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1.25rem 2rem;
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-lg);
}

.convert-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* Preview Section */
.preview-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.preview-actions {
    display: flex;
    gap: 0.75rem;
}

.copy-btn, .fullscreen-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-btn:hover, .fullscreen-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.preview-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.875rem 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.tab-btn.active {
    color: var(--primary-color);
}

.tab-btn.active::after {
    transform: scaleX(1);
}

.tab-btn:hover:not(.active) {
    color: var(--text-primary);
}

.preview-content {
    position: relative;
    min-height: 400px;
}

.preview-pane {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.preview-pane.active {
    opacity: 1;
    visibility: visible;
}

.preview-header-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.preview-label {
    font-weight: 600;
    color: var(--text-primary);
}

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

.code-preview {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    max-height: 400px;
    overflow-y: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text-primary);
}

.code-preview::-webkit-scrollbar {
    width: 8px;
}

.code-preview::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.code-preview::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}

.code-preview::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Download Section */
.download-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.download-card {
    background: var(--success-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    color: white;
    box-shadow: var(--shadow-lg);
}

.download-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.download-info h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.download-info p {
    opacity: 0.9;
    font-size: 0.875rem;
}

.download-btn {
    background: white;
    color: var(--success-color);
    border: none;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: auto;
}

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

/* Status Messages */
.status-message {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    animation: slideIn 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.status-message.success {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.1);
}

.status-message.error {
    border-color: var(--error-color);
    background: rgba(239, 68, 68, 0.1);
}

.status-message.warning {
    border-color: var(--warning-color);
    background: rgba(245, 158, 11, 0.1);
}

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

.status-message.success .status-icon {
    color: var(--success-color);
}

.status-message.error .status-icon {
    color: var(--error-color);
}

.status-message.warning .status-icon {
    color: var(--warning-color);
}

.status-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.status-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

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

.status-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: all 0.15s ease;
}

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

/* Footer */
.footer {
    margin-top: 3rem;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.footer-section p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.format-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.format-tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    box-shadow: var(--shadow-xl);
    max-width: 400px;
    width: 90%;
}

.loading-spinner {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto 2rem;
}

.spinner-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 4px solid var(--border-color);
    border-radius: 50%;
    animation: spin 1.5s linear infinite;
}

.spinner-ring:nth-child(1) {
    border-top-color: var(--primary-color);
    animation-delay: 0s;
}

.spinner-ring:nth-child(2) {
    border-right-color: var(--primary-color);
    animation-delay: 0.2s;
}

.spinner-ring:nth-child(3) {
    border-bottom-color: var(--primary-color);
    animation-delay: 0.4s;
}

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

.loading-card h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.loading-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    border-radius: var(--radius-sm);
    transition: width 0.3s ease;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0.75rem;
    }

    .header-content {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .format-controls {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .conversion-arrow {
        transform: rotate(90deg);
    }

    .conversion-options {
        flex-direction: column;
        gap: 1rem;
    }

    .download-card {
        flex-direction: column;
        text-align: center;
    }

    .download-btn {
        margin-left: 0;
        width: 100%;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .format-tags {
        justify-content: center;
    }

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

    .copy-btn, .fullscreen-btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .logo i {
        font-size: 1.5rem;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .drop-zone {
        padding: 2rem 1rem;
    }

    .upload-icon {
        font-size: 3rem;
    }

    .file-meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .loading-card {
        padding: 2rem;
    }
}

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

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

/* Example Buttons in Sidebar */
.example-btn {
    display: block;
    width: 100%;
    padding: 10px 15px;
    margin: 5px 0;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    text-align: left;
    transition: all 0.3s;
    font-size: 14px;
}

.example-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(5px);
    border-color: var(--primary-color);
}

.example-btn i {
    margin-right: 8px;
    width: 20px;
}

.sidebar-section {
    margin-bottom: 20px;
    padding: 15px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.sidebar-section h4 {
    margin-bottom: 15px;
    color: var(--text-primary);
    font-size: 16px;
}

.resource-link {
    display: block;
    padding: 8px 12px;
    margin: 5px 0;
    color: var(--primary-color);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all 0.3s;
}

.resource-link:hover {
    background: var(--bg-tertiary);
    padding-left: 18px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}
/* Examples Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-primary);
    padding: 30px;
    border-radius: 20px;
    max-width: 900px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: slideIn 0.3s;
}

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

.modal-close {
    position: absolute;
    top: 15px;
    right: 25px;
    font-size: 35px;
    cursor: pointer;
    color: var(--text-tertiary);
    transition: 0.3s;
}

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

.examples-grid { display: grid; gap: 30px; margin-top: 20px; }

.example-category { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 15px; }
.example-category h3 { grid-column: 1 / -1; color: var(--primary-color); margin-bottom: 15px; font-size: 1.3em; }

.example-card {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.example-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

.example-card h4 { margin: 0 0 10px 0; color: var(--text-primary); }
.example-btn { padding: 8px 16px; background: var(--primary-color); color: white; border: none; border-radius: 6px; cursor: pointer; font-size: 14px; }
.example-btn:hover { background: var(--primary-dark); }