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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav a:hover,
nav a.active {
    background-color: rgba(255,255,255,0.2);
}

/* Main Content */
main {
    min-height: calc(100vh - 120px);
    padding: 2rem 0;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.hero p {
    font-size: 1.2rem;
    color: #666;
}

/* Feature Cards */
.features {
    margin-bottom: 3rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: #333;
}

.feature-card p {
    color: #666;
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s;
    margin: 0.25rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #545b62;
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-info:hover {
    background: #138496;
}

/* Editor Styles */
.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.input-section,
.preview-section,
.export-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.export-section {
    grid-column: 1 / -1;
}

.input-section h3,
.preview-section h3,
.export-section h3 {
    margin-bottom: 1rem;
    color: #333;
}

#latexInput {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e9ecef;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    resize: vertical;
    margin-bottom: 1rem;
}

#latexInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.2);
}

.math-preview {
    min-height: 150px;
    padding: 1rem;
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 5px;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

/* Examples */
.examples {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.example-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.example-item {
    padding: 1rem;
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.example-item:hover {
    border-color: #667eea;
    background: #e8f0fe;
    transform: translateY(-2px);
}

/* Upload Section */
.upload-section {
    margin-bottom: 2rem;
}

.upload-area {
    background: white;
    border: 3px dashed #dee2e6;
    border-radius: 10px;
    padding: 3rem;
    text-align: center;
    transition: all 0.3s;
    cursor: pointer;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: #667eea;
    background: #f8f9ff;
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.upload-hint {
    color: #666;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.image-preview {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
}

.image-preview img {
    max-width: 100%;
    max-height: 400px;
    border-radius: 5px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 1rem;
}

/* Loading */
.loading-section {
    background: white;
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
}

.loading-spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* Result Section */
.result-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.result-tabs {
    display: flex;
    border-bottom: 2px solid #e9ecef;
    margin-bottom: 1rem;
}

.tab-btn {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-size: 1rem;
    color: #666;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

.tab-btn.active,
.tab-btn:hover {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e9ecef;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    resize: vertical;
    margin-bottom: 1rem;
}

/* Info Section */
.info,
.tips {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.info ul,
.tips ul {
    padding-left: 1.5rem;
}

.info li,
.tips li {
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 1rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .editor-container {
        grid-template-columns: 1fr;
    }
    
    nav ul {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .button-group {
        justify-content: center;
    }
    
    .result-tabs {
        overflow-x: auto;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .upload-section,
    .button-group,
    nav,
    footer {
        display: none !important;
    }
}