:root {
    --primary-color: #4a89dc;
    --secondary-color: #5d9cec;
    --background-color: #f5f7fa;
    --card-color: #ffffff;
    --text-color: #434a54;
    --text-light: #656d78;
    --border-color: #e6e9ed;
    --hover-color: #f5f7fa;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --category-colors: #4a89dc, #8cc152, #f6bb42, #e9573f, #967adc;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: 700;
}

.search-box {
    display: flex;
    background: var(--card-color);
    border-radius: 50px;
    padding: 5px 15px;
    box-shadow: 0 2px 10px var(--shadow-color);
    width: 300px;
}

.search-box input {
    border: none;
    outline: none;
    background: transparent;
    width: 100%;
    padding: 8px;
    font-size: 1rem;
}

.search-box button {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--primary-color);
}

main {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.category {
    background: var(--card-color);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px var(--shadow-color);
    transition: transform 0.3s ease;
    grid-column: 1 / -1;
}

.category:hover {
    transform: translateY(-5px);
}

.category-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.category-header i {
    font-size: 1.5rem;
    margin-right: 10px;
    color: var(--primary-color);
}

.category:nth-child(1) .category-header i {
    color: var(--category-colors, 0);
}

.category:nth-child(2) .category-header i {
    color: var(--category-colors, 1);
}

.category:nth-child(3) .category-header i {
    color: var(--category-colors, 2);
}

.category:nth-child(4) .category-header i {
    color: var(--category-colors, 3);
}

.category h2 {
    font-size: 1.5rem;
    font-weight: 500;
}

.bookmark-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.bookmark-group {
    background: var(--card-color);
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 2px 4px var(--shadow-color);
    transition: transform 0.2s ease;
}

.bookmark-group:hover {
    transform: translateY(-3px);
}

.bookmark-group h3 {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 15px;
    font-weight: 500;
}

.bookmarks {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 15px;
}

.bookmark-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-color);
    background: var(--card-color);
    padding: 15px 10px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.bookmark-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px var(--shadow-color);
    background: var(--hover-color);
}

.bookmark-card .icon {
    font-size: 1.8rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.bookmark-card .title {
    font-size: 0.9rem;
    text-align: center;
    font-weight: 400;
}

footer {
    margin-top: 40px;
    text-align: center;
    padding: 20px 0;
    color: var(--text-light);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .search-box {
        width: 100%;
        margin-top: 15px;
    }
    
    main {
        grid-template-columns: 1fr;
    }

    .bookmark-container {
        grid-template-columns: 1fr;
    }
}