:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --accent-color: #fbbc05;
    --warning-color: #ea4335;
    --text-color: #333;
    --bg-color: #f9f9f9;
    --card-bg: #ffffff;
    --header-bg: #ffffff;
}

/* 暗黑模式变量 */
.dark-mode {
    --primary-color: #8ab4f8;
    --secondary-color: #81c995;
    --accent-color: #fdd663;
    --warning-color: #f28b82;
    --text-color: #e8eaed;
    --bg-color: #202124;
    --card-bg: #303134;
    --header-bg: #282a2d;
}

* {
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

body {
    font-family: 'Roboto', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--header-bg);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 15px 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo h1 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.search-container {
    position: relative;
}

.search-input {
    padding: 8px 15px;
    border-radius: 20px;
    border: 1px solid #ddd;
    width: 200px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.search-btn {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.2rem;
}

main {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
    flex-grow: 1;
}

.categories {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.category-btn {
    padding: 8px 15px;
    border: none;
    border-radius: 20px;
    background-color: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.category-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.links-grid {
    display: grid;
    /* 修改网格布局，默认三列，最小宽度增加到350px */
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 25px;
    max-width: 1600px;
    margin: 0 auto;
}

.link-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    transition: transform 0.3s, box-shadow 0.3s;
    display: flex;
    flex-direction: column;
    /* 设置最小高度确保卡片更长 */
    min-height: 250px;
    position: relative;
    overflow: hidden;
}

.link-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding-bottom: 15px;
}

.card-icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
}

.card-title {
    flex-grow: 1;
}

.card-title h3 {
    margin: 0;
    font-size: 1.4rem;
    /* 添加文本长度过长时的处理 */
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-domain {
    font-size: 0.85rem;
    color: #888;
    margin-top: 5px;
}

.new-tag {
    background-color: var(--warning-color);
    color: white;
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 8px;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 0.7; }
    50% { opacity: 1; }
    100% { opacity: 0.7; }
}

.card-body {
    margin: 10px 0;
    flex-grow: 1;
    /* 添加内容区域样式 */
    line-height: 1.6;
    font-size: 0.95rem;
}

.card-body p {
    margin-top: 0;
}

/* 添加额外信息部分 */
.card-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: #666;
    margin: 15px 0;
    padding-top: 10px;
    border-top: 1px dashed rgba(0, 0, 0, 0.08);
}

.card-info span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 15px;
}

.goto-btn {
    padding: 8px 16px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.goto-btn:hover {
    background-color: #3367d6;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.latency {
    padding: 6px 10px;
    border-radius: 8px;
    background-color: var(--bg-color);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

/* 响应式布局调整 */
@media (min-width: 1600px) {
    .links-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 1200px) {
    .links-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .links-grid {
        grid-template-columns: 1fr;
    }
    
    .header-container {
        flex-direction: column;
        gap: 10px;
    }
    
    .search-input {
        width: 150px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .link-card {
        min-height: 200px;
    }
}

footer {
    background-color: var(--header-bg);
    padding: 20px;
    text-align: center;
    margin-top: 40px;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.visitor-counter {
    display: flex;
    align-items: center;
    gap: 10px;
}

.counter-box {
    background-color: var(--card-bg);
    padding: 5px 10px;
    border-radius: 5px;
    font-weight: bold;
    color: var(--primary-color);
}

.time-display {
    color: var(--text-color);
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 15px;
    height: 15px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 隐藏不属于当前分类的链接 */
.hidden {
    display: none;
}