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


/* 无障碍性：屏幕阅读器专用内容 */
.sr-only, .visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 焦点指示器改进 */
*:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

button:focus,
input:focus,
a:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

/* 改善颜色对比度 */
.high-contrast {
    --primary-color: #000000;
    --secondary-color: #0066cc;
    --text-color: #000000;
    --light-bg: #ffffff;
}

@media (prefers-contrast: high) {
    :root {
        --primary-color: #000000;
        --secondary-color: #0066cc;
        --text-color: #000000;
        --light-bg: #ffffff;
        --border-color: #000000;
    }
}

/* 减少动画 - 为有前庭功能障碍的用户 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 5px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
}

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

/* 头部样式 */
.header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

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

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

.logo i {
    font-size: 1.8rem;
    color: var(--secondary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.nav-menu ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
    flex-wrap: wrap;
    justify-content: center;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    background-color: var(--secondary-color);
}

/* 搜索区域样式 */
.search-section {
    margin: 2rem 0;
    text-align: center;
    padding: 0 1rem;
}

.search-container {
    max-width: 700px;
    margin: 0 auto 1.5rem;
    position: relative;
}

#searchForm {
    display: flex;
    width: 100%;
    position: relative;
}

#searchInput {
    flex: 1;
    padding: 1rem 3.5rem 1rem 1.2rem;
    border: 2px solid var(--border-color);
    border-radius: 12px 0 0 12px;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
    background: white;
    min-height: 52px;
    box-sizing: border-box;
}

#searchInput:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

#searchForm button[type="submit"] {
    padding: 1rem 1.5rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 0 12px 12px 0;
    cursor: pointer;
    transition: var(--transition);
    min-width: 60px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    box-sizing: border-box;
}

#searchForm button[type="submit"]:hover {
    background-color: #2980b9;
    transform: translateY(-1px);
}

#searchForm button[type="submit"]:active {
    transform: translateY(0);
}

.search-description {
    margin-top: 1rem;
    text-align: center;
}

.search-description p {
    color: #666;
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.5;
}



/* 网站卡片网格 */
.sites-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 2rem;
    margin: 2rem 0;
}

/* 确保PC端三个一行，覆盖所有可能的媒体查询冲突 */
@media (min-width: 1024px) {
    .sites-grid {
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 2rem !important;
    }
}

/* 中等屏幕（平板）两个一行 */
@media (min-width: 769px) and (max-width: 1023px) {
    .sites-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 1.5rem !important;
    }
}

.site-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

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

.site-card-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.site-icon {
    width: 40px;
    height: 40px;
    background-color: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.site-title {
    flex: 1;
}

.site-title h3 {
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
}

.site-category {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    background-color: #f0f0f0;
    border-radius: 12px;
    font-size: 0.8rem;
    color: #666;
}

.site-card-body {
    padding: 1rem;
    flex: 1;
}

.site-description {
    margin-bottom: 1rem;
    color: #666;
    line-height: 1.5;
}

.site-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.site-tag {
    padding: 0.2rem 0.5rem;
    background-color: #e3f2fd;
    border-radius: 12px;
    font-size: 0.8rem;
    color: var(--secondary-color);
}

.site-card-footer {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.site-visit-btn {
    padding: 0.5rem 1rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    text-decoration: none;
}

.site-visit-btn:hover,
.site-visit-btn:focus {
    background-color: #2980b9;
    color: white;
    text-decoration: none;
}

.site-detail-btn {
    padding: 0.5rem 1rem;
    background-color: #6c757d;
    color: white;
    border: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    text-decoration: none;
}

.site-detail-btn:hover,
.site-detail-btn:focus {
    background-color: #5a6268;
    color: white;
    text-decoration: none;
}

.site-rating {
    display: flex;
    gap: 0.2rem;
    color: #ffc107;
}

/* 添加网站表单 */
.add-site-section {
    margin: 3rem 0;
    padding: 2rem;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.add-site-section h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.add-site-form {
    display: grid;
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.add-site-form input,
.add-site-form select,
.add-site-form textarea {
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.add-site-form input:focus,
.add-site-form select:focus,
.add-site-form textarea:focus {
    border-color: var(--secondary-color);
}

.add-site-form textarea {
    min-height: 100px;
    resize: vertical;
}

#addSiteBtn {
    padding: 0.8rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
}

#addSiteBtn:hover {
    background-color: #2980b9;
}

/* 页脚样式 */
.footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .search-container {
        max-width: 100%;
        margin: 0 auto 1.5rem;
        padding: 0 0.5rem;
    }

    #searchInput {
        padding: 0.9rem 3rem 0.9rem 1rem;
        font-size: 16px; /* 防止iOS缩放 */
        border-radius: 10px 0 0 10px;
        min-height: 48px;
    }

    #searchForm button[type="submit"] {
        min-width: 50px;
        padding: 0.9rem 1rem;
        border-radius: 0 10px 10px 0;
        font-size: 1rem;
    }

    .search-section {
        padding: 0 0.5rem;
    }

    .search-description p {
        font-size: 0.85rem;
        padding: 0 0.5rem;
    }

    .sites-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .search-filters {
        justify-content: center;
    }

    .site-card-footer {
        flex-direction: column;
        gap: 0.8rem;
        align-items: stretch;
    }

    .site-card-footer > div {
        display: flex;
        gap: 0.8rem;
        justify-content: center;
    }

    .site-visit-btn,
    .site-detail-btn {
        flex: 1;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .logo h1 {
        font-size: 1.2rem;
    }

    .nav-link {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }

    .search-container {
        padding: 0;
    }

    #searchInput {
        padding: 0.8rem 2.5rem 0.8rem 0.8rem;
        font-size: 16px;
        border-radius: 8px 0 0 8px;
        min-height: 44px;
    }

    #searchForm button[type="submit"] {
        min-width: 45px;
        padding: 0.8rem 0.8rem;
        border-radius: 0 8px 8px 0;
        font-size: 0.9rem;
    }

    .search-section {
        padding: 0;
        margin: 1.5rem 0;
    }

    .search-description p {
        font-size: 0.8rem;
        padding: 0 1rem;
        line-height: 1.4;
    }

    .add-site-form {
        padding: 0 1rem;
    }
    .sites-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.site-card {
    animation: fadeIn 0.5s ease-in-out;
}

/* 隐藏元素的动画 */
.hide {
    display: none !important;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 2rem;
    color: #666;
}

.loading::after {
    content: "";
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--secondary-color);
    animation: spin 1s linear infinite;
    margin-left: 10px;
}

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

/* 强制PC端3列布局 - 最高优先级 */
@media (min-width: 1200px) {
    .sites-grid {
        display: grid !important;
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 2rem !important;
    }
}

/* 大屏幕桌面端 */
@media (min-width: 992px) and (max-width: 1199px) {
    .sites-grid {
        display: grid !important;
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 1.8rem !important;
    }
}

/* 中等屏幕桌面端 */
@media (min-width: 768px) and (max-width: 991px) {
    .sites-grid {
        display: grid !important;
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 1.5rem !important;
    }
}

/* 超大屏幕确保3列布局 */
@media (min-width: 1400px) {
    .sites-grid {
        display: grid !important;
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 2.5rem !important;
    }
}

/* 超强制PC端3列布局 - 覆盖所有可能的冲突 */
@media (min-width: 992px) {
    .sites-grid {
        display: grid !important;
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 2rem !important;
        width: 100% !important;
        max-width: 1200px !important;
        margin: 2rem auto !important;
    }

    /* 强制所有site-card在一行显示3个 */
    .sites-grid .site-card {
        width: 100% !important;
        max-width: none !important;
        flex: 1 1 0 !important;
        min-width: 0 !important;
    }
}