/* Global Styles */
:root {
    --primary-color: #0071e3;
    --secondary-color: #06c;
    --background-color: #fafafa;
    --card-color: #ffffff;
    --text-color: #1d1d1f;
    --text-secondary: #86868b;
    --border-color: #d2d2d7;
    --hover-color: #0077ed;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.47059;
    letter-spacing: -0.022em;
    font-size: 16px;
}

.container {
    max-width: 1072px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header Styles */
header {
    text-align: center;
    margin-bottom: 48px;
}

header h1 {
    color: var(--text-color);
    font-size: 48px;
    font-weight: 600;
    letter-spacing: -0.003em;
    margin-bottom: 18px;
}

.search-container {
    max-width: 680px;
    margin: 0 auto;
}

#searchInput {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 17px;
    outline: none;
    transition: all 0.3s;
    background-color: rgba(0, 0, 0, 0.02);
}

#searchInput:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.3);
}

/* Main Content Styles */
main {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.category {
    background-color: var(--card-color);
    border-radius: 18px;
    padding: 24px;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.category:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.category h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.bookmark-list {
    list-style: none;
}

.bookmark-item {
    margin-bottom: 12px;
}

.bookmark-item a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-color);
    padding: 10px 8px;
    border-radius: 8px;
    transition: background-color 0.2s;
}

.bookmark-item a:hover {
    background-color: rgba(0, 0, 0, 0.04);
    color: var(--primary-color);
}

.bookmark-icon {
    width: 18px;
    height: 18px;
    margin-right: 12px;
    border-radius: 4px;
    background-color: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

/* Footer Styles */
footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 38px;
    }
    
    .container {
        padding: 30px 16px;
    }
    
    main {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #1d1d1f;
        --card-color: #2d2d2f;
        --text-color: #f5f5f7;
        --text-secondary: #a1a1a6;
        --border-color: #424245;
    }
    
    #searchInput {
        background-color: rgba(255, 255, 255, 0.04);
    }
    
    .bookmark-item a:hover {
        background-color: rgba(255, 255, 255, 0.04);
    }
}