/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS变量 - 支持主题切换 */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

/* 暗色主题 */
[data-theme="dark"] {
    --bg-color: #1a202c;
    --card-bg: #2d3748;
    --text-color: #f7fafc;
    --text-secondary: #a0aec0;
    --border-color: #4a5568;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    min-height: 100vh;
    color: var(--text-color);
    transition: var(--transition);
}

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

/* 头部样式 */
.header {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 20px;
    gap: 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 1.8rem;
}

.search-container {
    flex: 1;
    max-width: 400px;
    position: relative;
    display: flex;
}

#searchInput {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
}

#searchInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

#searchBtn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

#searchBtn:hover {
    background: var(--secondary-color);
}

.theme-toggle button {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    padding: 0.75rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.theme-toggle button:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 主要内容区域 */
.main {
    background: var(--bg-color);
    min-height: calc(100vh - 140px);
    padding: 2rem 0;
}

section {
    margin-bottom: 3rem;
}

section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

section h2::before {
    content: '';
    width: 4px;
    height: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* 卡片网格布局 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

/* 个人导航特殊布局 */
.personal-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    max-width: 900px;
    margin: 0 auto;
    justify-content: center;
    gap: 2rem;
}

/* 个人导航卡片样式优化 */
.personal-nav .card {
    min-height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    transition: all 0.4s ease;
}

.personal-nav .card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.15);
}

.personal-nav .card-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.personal-nav .card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    font-weight: 600;
}

.personal-nav .card p {
    font-size: 1rem;
    opacity: 0.8;
}

.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.card:hover::before {
    transform: scaleX(1);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-align: center;
}

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    text-align: center;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
    line-height: 1.4;
}

/* 底部样式 */
.footer {
    background: var(--card-bg);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

/* 搜索高亮效果 */
.card.hidden {
    display: none;
}

.card.highlight {
    animation: pulse 0.5s ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .search-container {
        max-width: 100%;
    }
    
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
    }
    
    .personal-grid {
        grid-template-columns: 1fr;
        max-width: 100%;
        gap: 1.5rem;
    }
    
    .card {
        padding: 1rem;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .personal-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .personal-nav .card {
        min-height: 150px;
    }
    
    .personal-nav .card-icon {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }
    
    .personal-nav .card h3 {
        font-size: 1.2rem;
    }
    
    .logo {
        font-size: 1.2rem;
    }
    
    .logo i {
        font-size: 1.4rem;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(102, 126, 234, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}