:root {
    --primary: #2c3e50;
    --primary-light: #34495e;
    --secondary: #3498db;
    --light: #f5f7fa;
    --gray: #95a5a6;
    --border: #e0e0e0;
    --shadow: 0 2px 5px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
    --hover-bg: #fff9c4; /* 黄色背景 */
    --hover-border: #ffeb3b; /* 黄色边框 */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, sans-serif;
}

body {
    background-color: var(--light);
    color: var(--primary);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 15px;
}

header {
    background-color: white;
    border-bottom: 1px solid var(--border);
    padding: 15px 0;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 22px;
    font-weight: bold;
    color: var(--primary);
    text-decoration: none;
    display: inline-block;
    padding: 4px 8px; /* 预留hover框空间 */
    transition: var(--transition);
}

.logo span {
    color: var(--secondary);
}

/* logo链接悬停效果 */
.logo:hover {
    background-color: var(--hover-bg);
    border: 1px solid var(--hover-border);
    border-radius: 4px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav li {
    margin-left: 25px;
}

nav a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 6px 10px; /* 增加内边距让hover框更明显 */
    display: inline-block; /* 确保背景框完整显示 */
    position: relative;
}

/* 导航链接悬停效果（移除位移） */
nav a:hover {
    color: var(--primary); /* 保持文字颜色 */
    background-color: var(--hover-bg);
    border: 1px solid var(--hover-border);
    border-radius: 4px;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary);
    transition: var(--transition);
}

.search-section {
    padding: 20px 0;
    background-color: white;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.search-box {
    display: flex;
}

.search-input {
    flex: 1;
    padding: 10px 15px;
    border: 1px solid var(--border);
    border-right: none;
    font-size: 16px;
    outline: none;
    transition: var(--transition);
}

.search-input:focus {
    border-color: var(--secondary);
}

.search-btn {
    background-color: var(--secondary);
    color: white;
    border: none;
    padding: 0 20px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    background-color: #2980b9;
}

main {
    padding: 20px 0 40px;
}

.section-title {
    font-size: 18px;
    margin-bottom: 15px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--secondary);
    color: var(--primary);
}

.url-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-bottom: 30px;
}

.url-item {
    background-color: white;
    border: 1px solid var(--border);
    border-radius: 4px;
    transition: var(--transition);
    overflow: hidden;
}

.url-item:hover {
    box-shadow: var(--shadow);
    border-color: var(--hover-border); /* 容器边框随hover变化 */
}

.url-item a {
    display: block;
    padding: 12px 15px;
    text-decoration: none;
    color: var(--primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: var(--transition);
}

/* 链接项悬停效果（移除位移） */
.url-item a:hover {
    color: var(--primary);
    background-color: var(--hover-bg);
    border-radius: 3px; /* 与容器边框呼应 */
}

.category-list {
    background-color: white;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 15px;
    margin-bottom: 30px;
}

.category-item {
    padding: 8px 0;
    border-bottom: 1px dashed var(--border);
}

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

.category-item a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
    padding: 4px 8px; /* 固定内边距，避免位移 */
    display: inline-block;
}

/* 分类链接悬停效果（移除左移位移） */
.category-item a:hover {
    color: var(--primary);
    background-color: var(--hover-bg);
    border: 1px solid var(--hover-border);
    border-radius: 4px;
}

.tags-section {
    background-color: white;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 15px;
    margin-bottom: 30px;
}

.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag-item {
    background-color: var(--light);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 14px;
    transition: var(--transition);
}

.tag-item a {
    color: var(--primary);
    text-decoration: none;
    padding: 3px 6px;
    border-radius: 12px; /* 与标签圆角匹配 */
    display: inline-block;
}

/* 标签链接悬停效果（移除位移） */
.tag-item:hover {
    background-color: var(--hover-bg); /* 标签背景变为黄色 */
    border: 1px solid var(--hover-border);
}

.tag-item a:hover {
    color: var(--primary);
}

.pagination {
    display: flex;
    justify-content: center;
    margin: 30px 0;
    gap: 10px;
}

.page-link {
    display: inline-block;
    padding: 8px 15px;
    background-color: white;
    border: 1px solid var(--border);
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

/* 分页链接悬停效果（移除位移） */
.page-link:hover {
    background-color: var(--hover-bg);
    color: var(--primary);
    border-color: var(--hover-border);
}

.page-link.active {
    background-color: var(--secondary);
    color: white;
    border-color: var(--secondary);
}

.detail-card {
    background-color: white;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 20px;
    margin-bottom: 30px;
}

.detail-title {
    font-size: 22px;
    margin-bottom: 20px;
    color: var(--primary);
}

.detail-info {
    margin-bottom: 20px;
}

.detail-info p {
    margin-bottom: 10px;
}

.detail-info strong {
    display: inline-block;
    width: 100px;
    color: var(--primary-light);
}

.visit-btn {
    display: inline-block;
    background-color: var(--secondary);
    color: white;
    padding: 10px 20px;
    text-decoration: none;
    transition: var(--transition);
    border-radius: 4px;
}

/* 访问按钮悬停效果（移除位移） */
.visit-btn:hover {
    background-color: var(--hover-bg);
    color: var(--primary);
    border: 1px solid var(--hover-border);
}

.results-header {
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
}

.results-title {
    font-size: 18px;
    margin-bottom: 10px;
}

.results-count {
    color: var(--gray);
    font-size: 14px;
}

footer {
    background-color: var(--primary);
    color: white;
    padding: 30px 0 15px;
    margin-top: 40px;
}

.footer-content {
    text-align: center;
}

.footer-links {
    margin-bottom: 15px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    margin: 0 10px;
    transition: var(--transition);
    padding: 4px 8px;
    display: inline-block;
}

/* 页脚链接悬停效果（移除位移） */
.footer-links a:hover {
    color: var(--primary);
    background-color: var(--hover-bg);
    border: 1px solid var(--hover-border);
    border-radius: 4px;
}

.copyright {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 768px) {
    .url-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    nav ul {
        justify-content: center;
    }
    
    nav li {
        margin: 0 10px;
    }
}

@media (max-width: 480px) {
    .url-grid {
        grid-template-columns: 1fr;
    }
    
    .search-box {
        flex-direction: column;
    }
    
    .search-input {
        border-right: 1px solid var(--border);
        margin-bottom: 10px;
    }
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: #fff;
        padding: 1rem;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }
    nav ul.show {
        display: flex;
    }
}

.site-logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-right: 1.5rem;
}

.default-logo {
    width: 80px;
    height: 80px;
    background: #f0f0f0;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    color: #333;
    margin-right: 1.5rem;
}

.detail-header {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.tag {
    display: inline-block;
    background: #f0f0f0;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    color: #666;
    text-decoration: none;
}

/* 详情页标签悬停效果（移除位移） */
.tag:hover {
    background-color: var(--hover-bg);
    border: 1px solid var(--hover-border);
    color: var(--primary);
}

.visit-btn {
    display: inline-block;
    background: #0066cc;
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    margin-top: 1rem;
    transition: background 0.3s ease;
}

.detail-card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

.section-title {
    font-size: 1.5rem;
    margin: 1.5rem 0 1rem;
    color: #333;
}

.submit-section {
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    padding: 30px;
    margin: 30px 0;
}

.submit-section .section-title {
    color: #2c3e50;
    font-size: 24px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #3498db;
}

.submit-form {
    max-width: 800px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #34495e;
}

.required {
    color: #e74c3c;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: #7f8c8d;
    font-size: 14px;
}

.submit-notes {
    background-color: #f8f9fa;
    border-left: 4px solid #3498db;
    padding: 15px 20px;
    margin: 30px 0;
    border-radius: 0 6px 6px 0;
}

.submit-notes h4 {
    margin-top: 0;
    color: #2c3e50;
    font-size: 16px;
    margin-bottom: 10px;
}

.submit-notes ul {
    margin: 0;
    padding-left: 20px;
}

.submit-notes li {
    margin-bottom: 5px;
    color: #34495e;
    font-size: 14px;
}

.form-actions {
    text-align: center;
    margin-top: 30px;
}

.submit-btn {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease; /* 保留颜色过渡，移除位移 */
}

.submit-btn:hover {
    background-color: #2980b9;
    /* 移除上移效果：transform: translateY(-2px); */
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.2);
}

.success-message, .error-messages {
    padding: 20px;
    border-radius: 6px;
    margin-bottom: 30px;
}

.success-message {
    background-color: #f1f8e9;
    border: 1px solid #dcedc8;
    color: #558b2f;
    text-align: center;
}

.success-message h3 {
    margin-top: 0;
    color: #33691e;
}

.back-link {
    display: inline-block;
    margin-top: 15px;
    color: #3498db;
    text-decoration: none;
    font-weight: 600;
    padding: 4px 8px;
}

/* 返回链接悬停效果（移除位移） */
.back-link:hover {
    background-color: var(--hover-bg);
    border: 1px solid var(--hover-border);
    border-radius: 4px;
    text-decoration: none;
    color: var(--primary);
}

.error-messages {
    background-color: #ffebee;
    border: 1px solid #ffcdd2;
    color: #c62828;
}

.error-messages ul {
    margin: 0;
    padding-left: 20px;
}

.error-messages li {
    margin-bottom: 5px;
}

@media (max-width: 768px) {
    .submit-section {
        padding: 20px;
    }
    
    .form-group input,
    .form-group textarea,
    .form-group select {
        padding: 10px 12px;
        font-size: 14px;
    }
    
    .submit-btn {
        width: 100%;
        padding: 12px;
    }
}

.url-item a {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 15px 10px;
}

.url-item .default-logo {
    margin-right: 0;
    margin-bottom: 8px;
}

.url-item .site-domain {
    white-space: normal;
    word-break: break-all;
}