* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --bg-color: #F5F5F5;
    --card-color: #FFFFFF;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --border-color: #EEEEEE;
    --divider-color: #E5E5E5;
    
    /* 动态字体大小 - 使用clamp实现响应式 */
    font-size: clamp(14px, 2vw, 16px);
}

a {
    text-decoration: none;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: clamp(0.5rem, 2vw, 0.9375rem);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.back-btn {
    color: white;
    font-size: clamp(1.2rem, 3vw, 1.75rem);
    background: none;
    border: 0.2rem solid #ffffff;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: clamp(0.25rem, 0.75vw, 0.3125rem);
    padding: clamp( 0.3rem, 0.75vw, 0.3125rem);
    border-radius: 10%;
    transition: background-color 0.2s;
}

.back-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.header-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 500;
    text-align: center;
    flex: 1;
    padding-right: clamp(2.5rem, 6vw, 3rem);
}

.container {
    padding: clamp(1rem, 3vw, 1.25rem);
}

.category-section {
    background: var(--card-color);
    border-radius: 0.75rem;
    box-shadow: 0 0.125rem 0.75rem rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

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

.category-item {
    display: flex;
    align-items: center;
    padding: clamp(1rem, 3vw, 1.25rem) clamp(0.75rem, 2vw, 0.9375rem);
    border-bottom: 1px solid var(--divider-color);
    transition: background-color 0.2s;
    cursor: pointer;
    height: clamp(4rem, 7.5vw, 5rem);
}

.category-item:last-child {
    border-bottom: none;
}

.category-item:hover {
    background-color: #f8f9fa;
}

.category-icon {
    width: clamp(2rem, 5vw, 2.5rem);
    height: clamp(2rem, 5vw, 2.5rem);
    background: #f0f9f0;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(1rem, 3vw, 1.125rem);
    color: var(--primary-color);
    margin-right: clamp(0.75rem, 2vw, 0.9375rem);
}

.category-info {
    flex: 1;
}

.category-name {
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: clamp(0.25rem, 0.75vw, 0.3125rem);
}

.category-desc {
    font-size: clamp(0.8rem, 2.2vw, 0.875rem);
    color: var(--text-secondary);
}

.category-arrow {
    color: var(--text-light);
    font-size: clamp(0.9rem, 2.5vw, 1rem);
    margin-left: clamp(0.5rem, 1.5vw, 0.625rem);
}

/* 响应式调整 */
@media (max-width: 480px) {
    .container {
        padding: clamp(0.75rem, 2vw, 0.9375rem);
    }
    
    .category-item {
        padding: clamp(0.8rem, 2.5vw, 1rem) clamp(0.75rem, 2vw, 0.9375rem);
    }
}