/*!
 * 云盘搜 - 前台样式表
 * 现代化、简洁、响应式设计
 */

/* ====================
   CSS变量定义
   ==================== */
:root {
    /* 主色调 */
    --primary-color: #3B82F6;
    --primary-hover: #2563EB;
    --primary-light: #EFF6FF;
    
    /* 辅助色 */
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
    --info-color: #6B7280;
    
    /* 中性色 */
    --bg-color: #F9FAFB;
    --card-bg: #FFFFFF;
    --border-color: #E5E7EB;
    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-muted: #9CA3AF;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    
    /* 容器宽度 */
    --container-width: 1100px;
    --header-height: 64px;
}

/* ====================
   基础重置
   ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
    min-height: 100vh;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

img {
    max-width: 100%;
    height: auto;
}

ul, ol {
    list-style: none;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ====================
   布局组件
   ==================== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.main-wrapper {
    min-height: calc(100vh - 180px);
}

/* ====================
   头部导航
   ==================== */
.site-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.logo svg {
    width: 24px;
    height: 24px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    margin: 0 24px;
}

.nav-link {
    padding: 8px 16px;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

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

/* 下拉菜单 */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-btn {
    display: flex;
    align-items: center;
    gap: 4px;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 160px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    margin-top: 8px;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    margin-top: 4px;
}

.dropdown-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid var(--border-color);
}

.dropdown-item {
    display: block;
    padding: 10px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.dropdown-item:hover,
.dropdown-item.active {
    color: var(--primary-color);
    background: var(--primary-light);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* 登录/注册下拉菜单 */
.auth-dropdown {
    position: relative;
}

.auth-dropdown-btn {
    display: flex;
    align-items: center;
    gap: 4px;
}

.auth-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 160px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    margin-top: 8px;
    z-index: 1001;
}

.auth-dropdown:hover .auth-dropdown-menu {
    opacity: 1;
    visibility: visible;
    margin-top: 4px;
}

.auth-dropdown-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    right: 16px;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid var(--border-color);
}

.auth-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.auth-dropdown-item:hover {
    color: var(--primary-color);
    background: var(--primary-light);
}

.auth-dropdown-item svg {
    color: var(--text-muted);
}

.auth-dropdown-item:hover svg {
    color: var(--primary-color);
}

/* ====================
   Hero区域
   ==================== */
.hero-section {
    padding: 60px 0 48px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #6366F1 100%);
}

.hero-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.hero-title {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.hero-desc {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 32px;
}

.search-box {
    display: flex;
    gap: 8px;
    background: #fff;
    padding: 6px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.search-input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 16px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-field {
    width: 100%;
    padding: 14px 16px 14px 48px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    outline: none;
}

.search-field::placeholder {
    color: var(--text-muted);
}

.search-button {
    padding: 14px 28px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.hot-tags {
    margin-top: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
}

.hot-tags-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.85rem;
}

.hot-tag {
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border-radius: 20px;
    font-size: 0.8rem;
    transition: all var(--transition-fast);
}

.hot-tag:hover {
    background: rgba(255, 255, 255, 0.25);
    color: #fff;
}

/* ====================
   内容区域
   ==================== */
.content-section {
    padding: 40px 0;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title svg {
    color: var(--primary-color);
}

/* ====================
   资源列表
   ==================== */
.resource-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.resource-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.resource-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.resource-icon {
    width: 44px;
    height: 44px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
}

.resource-content {
    flex: 1;
    min-width: 0;
}

.resource-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.resource-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.resource-category {
    padding: 2px 10px;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
}

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

.resource-stats {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.resource-arrow {
    color: var(--text-muted);
    flex-shrink: 0;
}

.resource-item:hover .resource-arrow {
    color: var(--primary-color);
    transform: translateX(2px);
}

/* ====================
   资源卡片
   ==================== */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.resource-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.card-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.card-category {
    padding: 4px 10px;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.card-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.card-stats {
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-stats span {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.card-time {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ====================
   分类区域
   ==================== */
.category-section {
    padding: 20px 0 48px;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.category-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.category-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.category-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ====================
   按钮样式
   ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    text-decoration: none;
    font-size: 0.9rem;
}

.btn-primary {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    color: #fff;
}

.btn-outline {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

/* ====================
   提示框
   ==================== */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.alert-success {
    background: #D1FAE5;
    color: #065F46;
}

.alert-error {
    background: #FEE2E2;
    color: #991B1B;
}

/* ====================
   空状态
   ==================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* ====================
   底部样式
   ==================== */
.site-footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 32px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ====================
   认证页面样式
   ==================== */
.auth-container {
    max-width: 420px;
    margin: 60px auto;
    padding: 40px;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.auth-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 0.95rem;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 500;
}

/* ====================
   表单样式
   ==================== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-size: 0.95rem;
    background: var(--bg-color);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
    background: var(--card-bg);
}

.form-input::placeholder {
    color: var(--text-muted);
}

/* ====================
   响应式设计 - 平板设备
   ==================== */
@media (max-width: 768px) {
    :root {
        --header-height: auto;
    }
    
    .header-inner {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 0;
        gap: 12px;
    }
    
    .main-nav {
        order: 3;
        width: 100%;
        margin: 0;
        overflow-x: auto;
        padding-bottom: 4px;
        -webkit-overflow-scrolling: touch;
    }
    
    /* 移动端登录/注册按钮优化 */
    .header-actions {
        gap: 6px;
    }
    
    .auth-dropdown {
        position: static;
    }
    
    .auth-dropdown-btn {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
    
    /* 移动端直接显示登录/注册按钮，不使用下拉菜单 */
    .auth-dropdown-menu {
        position: fixed;
        top: auto;
        left: 50%;
        right: auto;
        bottom: 20px;
        transform: translateX(-50%);
        min-width: 200px;
        margin: 0;
        background: var(--card-bg);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        opacity: 1;
        visibility: visible;
        display: none;
        z-index: 1001;
    }
    
    .auth-dropdown.active .auth-dropdown-menu {
        display: block;
        animation: slideUpFade 0.2s ease;
    }
    
    .auth-dropdown-menu::before {
        display: none;
    }
    
    @keyframes slideUpFade {
        from {
            opacity: 0;
            transform: translateX(-50%) translateY(10px);
        }
        to {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }
    }
    
    .hero-section {
        padding: 40px 0;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .hero-desc {
        font-size: 0.9rem;
    }
    
    .search-box {
        flex-direction: column;
        padding: 8px;
    }
    
    .search-button {
        width: 100%;
    }
    
    .hot-tags {
        gap: 6px;
    }
    
    /* 移动端资源列表优化 - 修复信息显示不全问题 */
    .resource-item {
        padding: 12px 16px;
        flex-wrap: nowrap;
        align-items: flex-start;
        gap: 12px;
    }
    
    .resource-icon {
        width: 36px;
        height: 36px;
        flex-shrink: 0;
    }
    
    .resource-content {
        flex: 1;
        min-width: 0;
        padding-right: 8px;
    }
    
    .resource-title {
        font-size: 0.9rem;
        margin-bottom: 4px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    
    .resource-meta {
        gap: 8px;
        font-size: 0.75rem;
    }
    
    .resource-category {
        padding: 2px 8px;
        font-size: 0.7rem;
    }
    
    .resource-time {
        font-size: 0.75rem;
    }
    
    .resource-stats {
        display: flex;
        align-items: center;
        gap: 12px;
        width: auto;
        margin-top: 0;
        padding-top: 0;
        border-top: none;
        flex-shrink: 0;
    }
    
    .stat-item {
        font-size: 0.75rem;
        white-space: nowrap;
    }
    
    .resource-arrow {
        flex-shrink: 0;
        width: 18px;
        height: 18px;
    }
    
    .resource-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* ====================
   响应式设计 - 手机设备
   ==================== */
@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }
    
    .logo {
        font-size: 1.1rem;
    }
    
    .logo svg {
        width: 20px;
        height: 20px;
    }
    
    .nav-link {
        padding: 6px 10px;
        font-size: 0.8rem;
    }
    
    /* 移动端头部操作区域优化 */
    .header-actions {
        position: fixed;
        top: 12px;
        right: 12px;
        z-index: 1002;
        background: rgba(255, 255, 255, 0.95);
        padding: 6px 10px;
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-md);
        backdrop-filter: blur(8px);
    }
    
    .auth-dropdown-btn {
        padding: 5px 10px;
        font-size: 0.8rem;
    }
    
    .dropdown-menu {
        left: 0;
        transform: none;
    }
    
    .dropdown-menu::before {
        left: 32px;
    }
    
    /* 移动端分类网格优化 */
    .category-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }
    
    .category-card {
        padding: 12px 6px;
        gap: 6px;
    }
    
    .category-icon {
        width: 36px;
        height: 36px;
    }
    
    .category-name {
        font-size: 0.75rem;
        text-align: center;
    }
    
    .category-icon svg {
        width: 18px;
        height: 18px;
    }
    
    /* 极小屏幕资源列表进一步优化 */
    .resource-item {
        padding: 10px 12px;
        gap: 10px;
    }
    
    .resource-icon {
        width: 32px;
        height: 32px;
    }
    
    .resource-icon svg {
        width: 16px;
        height: 16px;
    }
    
    .resource-title {
        font-size: 0.85rem;
    }
    
    .resource-meta {
        flex-wrap: nowrap;
        gap: 6px;
    }
    
    .resource-category {
        padding: 1px 6px;
        font-size: 0.65rem;
    }
    
    .resource-time {
        font-size: 0.7rem;
        white-space: nowrap;
    }
    
    .stat-item svg {
        width: 12px;
        height: 12px;
    }
    
    .resource-stats {
        gap: 8px;
    }
    
    /* 资源卡片移动端优化 */
    .resource-card {
        padding: 16px;
    }
    
    .card-icon {
        width: 36px;
        height: 36px;
    }
    
    .card-title {
        font-size: 0.9rem;
    }
    
    .card-category {
        padding: 3px 8px;
        font-size: 0.7rem;
    }
}