:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #34495e;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --info-color: #1abc9c;
    --text-color: #333;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

.dark-mode {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --bg-color: #1a1a2e;
    --text-color: #ecf0f1;
    --card-bg: #16213e;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

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

header {
    background: linear-gradient(135deg, var(--primary-color), var(--dark-color));
    color: white;
    padding: 1.5rem 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    display: flex;
    align-items: center;
}

.logo i {
    margin-right: 10px;
}

.theme-switch {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1.5rem;
}

h1 {
    text-align: center;
    margin: 2rem 0;
    color: var(--primary-color);
}

.search-box {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
    transition: var(--transition);
}

#search {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: var(--transition);
}

#search:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.categories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.category {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.category:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.category-header {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.category-header h2 {
    font-size: 1.4rem;
}

.category-content {
    padding: 1.5rem;
}

.command {
    margin-bottom: 1.2rem;
    padding-bottom: 1.2rem;
    border-bottom: 1px solid #eee;
}

.command:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.command code {
    background-color: rgba(0, 0, 0, 0.05);
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: var(--accent-color);
    font-weight: bold;
    display: block;
    margin-bottom: 0.4rem;
    white-space: nowrap;
    overflow-x: auto;
    transition: var(--transition);
}

.command p {
    color: var(--text-color);
    font-size: 0.95rem;
}

footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--dark-color);
    color: white;
    margin-top: 2rem;
}

.hidden {
    display: none;
}

.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

@media (max-width: 768px) {
    .categories {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
}

.command-usage {
    font-size: 0.85rem;
    color: #777;
    margin-top: 0.3rem;
}

.examples {
    background-color: rgba(0, 0, 0, 0.03);
    padding: 0.8rem;
    border-left: 3px solid var(--secondary-color);
    margin-top: 0.5rem;
    border-radius: 0 4px 4px 0;
}

.examples p {
    margin: 0.3rem 0;
    font-size: 0.85rem;
}

.keyboard-shortcuts {
    margin-top: 2rem;
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.shortcut {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px dashed #eee;
}

.shortcut:last-child {
    border-bottom: none;
}

.key {
    background: var(--primary-color);
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
}