/* ========================================
   网址导航网站 - 深色侧边栏 + 浅色主内容区
   ======================================== */

/* CSS 变量 */
:root {
    /* 侧边栏 */
    --sidebar-bg: #1a1a2e;
    --sidebar-text: #e0e0e0;
    --sidebar-hover: #252545;
    --sidebar-active: #2a2a4a;
    --sidebar-active-border: #e94560;
    --sidebar-width: 220px;
    --sidebar-collapsed-width: 0px;
    --content-max-width: 1400px;

    /* 主内容区 */
    --main-bg: #f5f5f5;
    --card-bg: #ffffff;
    --text-primary: #333333;
    --text-secondary: #888888;

    /* 强调色 */
    --accent: #e94560;
    --accent-hover: #ff3570;

    /* 搜索区 */
    --search-gradient: linear-gradient(135deg, #1a1a2e, #16213e);

    /* 其他 */
    --border-color: #e0e0e0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.3s ease;
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--main-bg);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

/* 无障碍：视觉隐藏但屏幕阅读器可读 */
.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;
}

.app-layout {
    display: flex;
    min-height: 100vh;
}

/* ========================================
   左侧侧边栏
   ======================================== */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 1000;
    transition: transform var(--transition), min-width var(--transition), width var(--transition);
    overflow: hidden;
}

/* 侧边栏 Logo 区域 */
.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 18px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    flex-shrink: 0;
}

.sidebar-logo .logo-icon {
    font-size: 26px;
}

.sidebar-logo .logo-text {
    font-size: 18px;
    font-weight: 700;
    color: #ffffff;
    white-space: nowrap;
}

/* 侧边栏折叠按钮 */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 1100;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--sidebar-bg);
    border: none;
    color: var(--sidebar-text);
    font-size: 20px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
    box-shadow: var(--shadow-md);
}

.sidebar-toggle:hover {
    background: var(--sidebar-hover);
}

/* 侧边栏导航列表 */
.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 12px 0;
}

.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

/* 一级分类 */
.sidebar-category {
    margin-bottom: 2px;
}

.sidebar-category-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 18px;
    color: var(--sidebar-text);
    font-size: 14px;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    user-select: none;
    white-space: nowrap;
}

.sidebar-category-link:hover {
    background: var(--sidebar-hover);
}

.sidebar-category-link.active {
    background: var(--sidebar-active);
    border-left: 3px solid var(--sidebar-active-border);
    color: #ffffff;
}

.sidebar-category-link .category-emoji {
    font-size: 16px;
    width: 22px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-category-link .category-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-category-link .category-arrow {
    font-size: 10px;
    transition: transform var(--transition);
    flex-shrink: 0;
    opacity: 0.5;
}

.sidebar-category-link.expanded .category-arrow {
    transform: rotate(90deg);
}

/* 二级分类 */
.sidebar-subcategories {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}

.sidebar-subcategories.open {
    max-height: 500px;
}

.sidebar-subcategory-link {
    display: block;
    padding: 8px 18px 8px 50px;
    color: rgba(224, 224, 224, 0.6);
    font-size: 13px;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-subcategory-link:hover {
    background: var(--sidebar-hover);
    color: var(--sidebar-text);
}

.sidebar-subcategory-link.active {
    background: var(--sidebar-active);
    border-left: 3px solid var(--sidebar-active-border);
    color: #ffffff;
}

/* 侧边栏底部 */
.sidebar-footer {
    padding: 16px 18px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    flex-shrink: 0;
}

.sidebar-footer a {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(224, 224, 224, 0.5);
    font-size: 13px;
    transition: color var(--transition);
}

.sidebar-footer a:hover {
    color: var(--accent);
}

/* 侧边栏遮罩层（移动端） */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

.sidebar-overlay.show {
    display: block;
}

/* ========================================
   主内容区
   ======================================== */
.main-wrapper {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--transition);
}

/* ========================================
   顶部导航栏（隐藏/最小化）
   ======================================== */
.navbar {
    display: none;
}

/* ========================================
   搜索区域
   ======================================== */
.search-section {
    background: var(--search-gradient);
    padding: 40px 30px 36px;
    position: relative;
    overflow: hidden;
}

.search-section::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), #ff6b6b, var(--accent));
    background-size: 200% 100%;
    animation: shimmer 3s ease infinite;
}

@keyframes shimmer {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.search-container {
    max-width: 680px;
    margin: 0 auto;
    text-align: center;
}

.search-title {
    font-size: 26px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 6px;
}

.search-subtitle {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 24px;
}

.search-box {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    overflow: hidden;
    transition: border-color var(--transition), background var(--transition);
}

.search-box:focus-within {
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.15);
}

.search-box .search-icon {
    padding: 0 0 0 20px;
    font-size: 16px;
    color: rgba(255, 255, 255, 0.4);
    flex-shrink: 0;
}

.search-box input {
    flex: 1;
    padding: 14px 16px;
    border: none;
    background: transparent;
    color: #ffffff;
    font-size: 15px;
    outline: none;
    min-width: 0;
}

.search-box input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.search-box button {
    padding: 14px 28px;
    background: var(--accent);
    border: none;
    color: #ffffff;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition);
    flex-shrink: 0;
}

.search-box button:hover {
    background: var(--accent-hover);
}

/* ========================================
   主内容区
   ======================================== */
.main-content {
    flex: 1;
    padding: 24px 30px 40px;
    max-width: var(--content-max-width);
    width: 100%;
    margin: 0 auto;
}

/* ========================================
   分类区块
   ======================================== */
.category-section {
    margin-bottom: 32px;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

.category-icon {
    font-size: 22px;
}

.category-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

/* 二级分类筛选标签（pill 形状） */
.subcategory-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.subcategory-tag {
    padding: 6px 16px;
    background: #e8e8e8;
    border-radius: 50px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    white-space: nowrap;
    user-select: none;
}

.subcategory-tag:hover {
    background: #d0d0d0;
    color: var(--text-primary);
}

.subcategory-tag.active {
    background: var(--accent);
    color: #ffffff;
}

/* ========================================
   网站卡片网格
   ======================================== */
.website-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px;
    align-items: start;
}

/* ========================================
   网站卡片
   ======================================== */
.website-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
    box-shadow: var(--shadow-sm);
    border: 1px solid transparent;
    width: 100%;
    min-height: 68px;
    position: relative;
    overflow: visible;
}

.website-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(0, 0, 0, 0.04);
    z-index: 201;
}

/* 卡片图标 */
.website-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #ffffff;
    flex-shrink: 0;
    font-weight: 600;
}

/* 卡片信息 */
.website-info {
    flex: 1;
    min-width: 0;
}

.website-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.website-desc {
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
}

.website-card-tooltip {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 8px);
    padding: 10px 12px;
    background: rgba(26, 26, 46, 0.96);
    color: #f0f0f0;
    font-size: 12px;
    line-height: 1.6;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    white-space: normal;
    word-break: break-word;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    transform: translateY(-4px);
}

.website-card-tooltip::after {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 24px;
    border: 6px solid transparent;
    border-bottom-color: rgba(26, 26, 46, 0.96);
}

.website-card:hover .website-card-tooltip,
.website-card:focus-visible .website-card-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: #ffffff;
    padding: 24px 30px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.footer-content {
    max-width: var(--content-max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright {
    font-size: 13px;
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    font-size: 13px;
    color: var(--text-secondary);
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--accent);
}

/* ========================================
   申请收录页面
   ======================================== */
.submit-section {
    max-width: 600px;
    margin: 40px auto;
    padding: 36px;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.submit-title {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.submit-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 28px;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--main-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

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

.btn-primary {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-md);
    color: #ffffff;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition);
}

.btn-primary:hover {
    background: var(--accent-hover);
}

/* ========================================
   资讯页面
   ======================================== */
.news-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 30px;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.news-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    box-shadow: var(--shadow-sm);
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.news-image {
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
}

.news-content {
    padding: 18px;
}

.news-category {
    display: inline-block;
    padding: 3px 10px;
    background: var(--accent);
    border-radius: 50px;
    font-size: 12px;
    color: #ffffff;
    margin-bottom: 8px;
}

.news-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.news-summary {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.6;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 12px;
}

/* 资讯详情页 */
.news-detail {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 30px;
}

.news-detail-header {
    text-align: center;
    margin-bottom: 32px;
}

.news-detail-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.4;
}

.news-detail-meta {
    color: var(--text-secondary);
    display: flex;
    justify-content: center;
    gap: 20px;
    font-size: 13px;
}

.news-detail-content {
    background: var(--card-bg);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    line-height: 1.8;
    color: var(--text-primary);
}

.news-detail-content p {
    margin-bottom: 16px;
}

/* ========================================
   加载动画
   ======================================== */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ========================================
   消息提示
   ======================================== */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 14px 22px;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--accent);
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    transform: translateX(calc(100% + 40px));
    transition: transform var(--transition);
    font-size: 14px;
    color: var(--text-primary);
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left-color: #4caf50;
}

.toast.error {
    border-left-color: #f44336;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
    /* 侧边栏变为抽屉式 */
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-toggle {
        display: flex;
    }

    .main-wrapper {
        margin-left: 0;
    }

    /* 搜索区域 */
    .search-section {
        padding: 60px 20px 32px;
    }

    .search-title {
        font-size: 22px;
    }

    /* 主内容区 */
    .main-content {
        padding: 16px 16px 32px;
    }

    /* 卡片网格自适应 */
    .website-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
    }

    /* 分类区块 */
    .category-header {
        margin-bottom: 10px;
    }

    .category-title {
        font-size: 16px;
    }

    /* 资讯网格 */
    .news-grid {
        grid-template-columns: 1fr;
    }

    /* 页脚 */
    .footer {
        padding: 20px 16px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    /* 申请收录 */
    .submit-section {
        margin: 24px 16px;
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .website-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }

    .search-box {
        flex-direction: column;
        border-radius: var(--radius-md);
        gap: 0;
    }

    .search-box .search-icon {
        display: none;
    }

    .search-box input {
        padding: 12px 16px;
        text-align: center;
    }

    .search-box button {
        padding: 12px;
        border-radius: 0 0 var(--radius-md) var(--radius-md);
    }
}