/* ========== 全局变量 ========== */
:root {
    --primary-color: #4F6EF7;
    --primary-hover: #3B5CE4;
    --primary-light: #EEF1FE;
    --primary-lighter: #F5F7FF;
    --bg-color: #F0F2F5;
    --card-bg: #FFFFFF;
    --text-primary: #1A1A2E;
    --text-secondary: #8C8FA3;
    --text-tertiary: #B0B3C5;
    --border-color: #E8EAF0;
    --border-radius-xs: 6px;
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --transition-fast: 0.15s;
    --transition-normal: 0.25s;
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08), 0 2px 6px rgba(0, 0, 0, 0.04);
    --shadow-card-hover: 0 8px 24px rgba(79, 110, 247, 0.1), 0 2px 6px rgba(0, 0, 0, 0.04);
    --danger-color: #EF4444;
    --success-color: #10B981;
    --purple: #8B5CF6;
}

/* ========== 全局基础 ========== */
body {
    background-color: var(--bg-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 100vh;
}

/* ========== 导航栏 ========== */
.navbar {
    background: var(--card-bg) !important;
    box-shadow: 0 1px 0 var(--border-color);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1030;
}

.navbar > .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-top: 0.7rem;
    padding-bottom: 0.7rem;
}

.navbar-brand {
    font-size: 1.3rem !important;
    font-weight: 700 !important;
    color: var(--primary-color) !important;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    text-decoration: none;
    padding: 0;
    white-space: nowrap;
    flex-shrink: 0;
    line-height: 1;
}

.navbar-brand .brand-text {
    background: linear-gradient(135deg, var(--primary-color) 0%, #7C3AED 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-brand:hover {
    color: var(--primary-color) !important;
}

/* ========== 搜索框 ========== */
.search-box-wrapper {
    display: flex;
    align-items: center;
    background: var(--bg-color);
    border-radius: var(--border-radius-lg);
    padding: 3px;
    border: 2px solid transparent;
    transition: all var(--transition-normal) ease;
    max-width: 460px;
    width: 100%;
}

.search-box-wrapper:focus-within {
    background: var(--card-bg);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(79, 110, 247, 0.08);
}

.search-icon {
    position: absolute;
    left: 15px;
    color: var(--text-tertiary);
    font-size: 0.9rem;
    z-index: 2;
    pointer-events: none;
    transition: color var(--transition-normal) ease;
}

.search-box-wrapper:focus-within .search-icon {
    color: var(--primary-color);
}

.search-input {
    width: 100% !important;
    border: none !important;
    background: transparent !important;
    padding: 0.5rem 0.75rem 0.5rem 2.3rem !important;
    font-size: 0.88rem !important;
    color: var(--text-primary);
    outline: none !important;
    box-shadow: none !important;
    border-radius: var(--border-radius-lg) 0 0 var(--border-radius-lg) !important;
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-btn {
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 0 var(--border-radius-lg) var(--border-radius-lg) 0 !important;
    padding: 0.5rem 1.2rem;
    font-size: 0.88rem;
    font-weight: 500;
    transition: all var(--transition-fast) ease;
    white-space: nowrap;
    flex-shrink: 0;
    letter-spacing: 0.02em;
}

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

.search-btn:active {
    transform: scale(0.97);
}

/* ========== 页面主内容区 ========== */
main.container {
    padding-top: 1.25rem;
    padding-bottom: 2rem;
}

/* ========== 筛选栏 ========== */
.filter-bar {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 0.65rem 1rem;
    box-shadow: var(--shadow-xs);
    border: 1px solid var(--border-color);
    margin-bottom: 1.25rem;
}

.filter-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-item {
    display: flex;
    align-items: center;
}

.filter-dropdown {
    height: 32px;
    font-size: 0.8rem;
    padding: 0 12px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    white-space: nowrap;
    color: var(--text-primary);
    transition: all var(--transition-fast) ease;
    gap: 1px;
    letter-spacing: 0.01em;
}

.filter-dropdown:hover {
    border-color: var(--primary-color);
    background: var(--primary-lighter);
    color: var(--primary-color);
}

.filter-dropdown:focus,
.filter-dropdown[aria-expanded="true"] {
    border-color: var(--primary-color);
    background: var(--card-bg);
    box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.08);
    color: var(--primary-color);
}

.filter-dropdown::after {
    margin-left: 3px;
    font-size: 0.6rem;
    color: var(--text-tertiary);
    transition: transform var(--transition-fast) ease;
}

.filter-dropdown[aria-expanded="true"]::after {
    transform: rotate(180deg);
}

.filter-dropdown i {
    font-size: 0.82rem;
    opacity: 0.6;
}

.btn-clear-filter {
    height: 32px;
    font-size: 0.8rem;
    padding: 0 12px;
    background: var(--card-bg);
    border: 1px solid #F9A8A8;
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    white-space: nowrap;
    color: var(--danger-color);
    transition: all var(--transition-fast) ease;
    gap: 1px;
    letter-spacing: 0.01em;
}

.btn-clear-filter:hover {
    background: #FEF2F2;
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.btn-clear-filter i {
    font-size: 0.82rem;
}

/* 筛选下拉菜单 */
.filter-bar .dropdown-menu {
    min-width: fit-content;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-md);
    padding: 4px;
    font-size: 0.8rem;
    overflow: hidden;
    animation-duration: 0.15s !important;
}

.filter-bar .dropdown-item {
    padding: 5px 12px;
    border-radius: var(--border-radius-xs);
    font-size: 0.8rem;
    color: var(--text-primary);
    transition: all var(--transition-fast) ease;
    white-space: nowrap;
}

.filter-bar .dropdown-item:hover {
    background: var(--primary-lighter);
    color: var(--primary-color);
}

.filter-bar .dropdown-item:active {
    background: var(--primary-lighter);
    color: var(--primary-color);
}

/* ========== 搜索结果提示 ========== */
.search-result-info {
    padding: 0.4rem 0;
    margin-bottom: 0.5rem;
}

.result-count-text {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin: 0;
}

.result-count-text .text-primary {
    color: var(--primary-color) !important;
    font-weight: 600;
}

/* ========== 资源卡片列表 ========== */
.search-results {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ========== 单个资源卡片 ========== */
.resource-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all var(--transition-normal) ease;
    border: 1px solid var(--border-color);
}

.resource-card:hover {
    box-shadow: var(--shadow-card-hover);
    border-color: rgba(79, 110, 247, 0.15);
    transform: translateY(-1px);
}

.resource-card:focus {
    outline: none;
}

.resource-card-inner {
    padding: 1rem 1.2rem;
}

/* 卡片头部 */
.resource-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 0.5rem;
}

.resource-title {
    font-size: 0.92rem;
    font-weight: 600;
    margin: 0;
    line-height: 1.55;
    flex: 1;
    min-width: 0;
}

.resource-title .file-title {
    color: var(--text-primary);
    text-decoration: none;
    transition: color var(--transition-fast) ease;
    display: inline;
    word-break: break-word;
}

.resource-title .file-title:hover {
    color: var(--primary-color);
}

.resource-date {
    font-size: 0.72rem;
    color: var(--text-tertiary);
    white-space: nowrap;
    flex-shrink: 0;
    padding-top: 3px;
    line-height: 1;
}

.resource-date i {
    font-size: 0.68rem;
    margin-right: 2px;
    opacity: 0.7;
}

/* ========== 目录区域 ========== */
.directory-box {
    background: var(--primary-lighter);
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 0.65rem;
    margin-bottom: 0.5rem;
    max-height: 150px;
    overflow-y: auto;
    border: 1px solid rgba(79, 110, 247, 0.06);
}

.directory-item {
    padding: 0.2rem 0.4rem;
    margin-bottom: 1px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    border-radius: var(--border-radius-xs);
    transition: all var(--transition-fast) ease;
    line-height: 1.55;
    word-break: break-all;
}

.directory-item i {
    font-size: 0.72rem;
    opacity: 0.45;
    margin-right: 1px;
}

.directory-item:hover {
    background: rgba(79, 110, 247, 0.08);
    color: var(--primary-color);
}

.directory-item:last-child {
    margin-bottom: 0;
}

/* ========== 资源卡片底部 ========== */
.resource-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-top: 0.4rem;
}

.badge-group {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.badge {
    font-size: 0.7rem;
    padding: 0.25em 0.65em;
    border-radius: var(--border-radius-xs);
    font-weight: 500;
    transition: all var(--transition-fast) ease;
    letter-spacing: 0.02em;
    line-height: 1.5;
}

.badge:hover {
    transform: none;
}

.badge.bg-primary { background-color: var(--primary-color) !important; color: #fff; }
.badge.bg-success { background-color: var(--success-color) !important; color: #fff; }
.badge.bg-danger { background-color: var(--danger-color) !important; color: #fff; }
.badge.bg-info { background-color: #06B6D4 !important; color: #fff; }
.badge.bg-warning { background-color: #F59E0B !important; color: #fff; }
.badge.bg-secondary { background-color: var(--bg-color) !important; color: var(--text-secondary); }

/* 提取码样式 */
.badge.extraction-code {
    background: linear-gradient(135deg, #8B5CF6 0%, #6D28D9 100%);
    color: white;
    display: inline-flex;
    align-items: center;
    gap: 2px;
    font-weight: 500;
    cursor: pointer;
}

.badge.extraction-code i {
    font-size: 0.65rem;
    opacity: 0.85;
}

/* 访问资源按钮 */
.resource-go-btn {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    font-size: 0.76rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    padding: 3px 10px;
    border-radius: var(--border-radius-xs);
    transition: all var(--transition-fast) ease;
    white-space: nowrap;
    flex-shrink: 0;
    background: var(--primary-lighter);
    border: 1px solid transparent;
}

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

.resource-go-btn i {
    font-size: 0.68rem;
    transition: transform var(--transition-fast) ease;
}

.resource-go-btn:hover i {
    transform: translateX(2px);
}

/* ========== 分页 ========== */
.pagination-container {
    padding: 1.5rem 0 1rem;
}

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

.pagination .page-item {
    display: flex;
}

.pagination .page-link {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    background-color: var(--card-bg);
    padding: 0.3rem 0.65rem;
    font-size: 0.8rem;
    min-width: 34px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-xs) !important;
    transition: all var(--transition-fast) ease;
    white-space: nowrap;
}

.pagination .page-link:hover {
    background: var(--primary-lighter);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.pagination .page-item.active .page-link {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
    font-weight: 500;
}

.pagination .page-item.disabled .page-link {
    background: var(--bg-color);
    border-color: var(--border-color);
    color: var(--text-tertiary);
    opacity: 0.7;
}

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: all var(--transition-normal) ease;
    padding: 0;
    box-shadow: var(--shadow-md);
    background: var(--primary-color);
    border: none;
    color: #fff;
}

.back-to-top:hover {
    opacity: 1 !important;
    transform: translateY(-3px);
    background: var(--primary-hover);
    color: #fff;
    box-shadow: var(--shadow-lg);
}

.back-to-top i {
    font-size: 17px;
}

/* ========== 搜索关键词高亮 ========== */
.highlight-keyword {
    background-color: rgba(79, 110, 247, 0.12);
    color: var(--primary-color);
    border-radius: 3px;
    padding: 0 2px;
    font-weight: 600;
}

.file-title:hover .highlight-keyword {
    background-color: rgba(79, 110, 247, 0.22);
}

.directory-item .highlight-keyword {
    background-color: rgba(79, 110, 247, 0.1);
    color: var(--primary-color);
}

/* ========== 骨架屏 ========== */
@keyframes shimmer {
    0% { background-position: -800px 0; }
    100% { background-position: 800px 0; }
}

.skeleton {
    animation: shimmer 1.8s infinite linear;
    background: linear-gradient(to right, #f6f7f8 4%, #edeef1 25%, #f6f7f8 36%);
    background-size: 800px 100%;
    border-radius: var(--border-radius-xs);
}

.skeleton-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1rem 1.2rem;
    margin-bottom: 12px;
    border: 1px solid var(--border-color);
}

.skeleton-title {
    height: 16px;
    width: 45%;
    max-width: 280px;
    margin-bottom: 0;
}

.skeleton-directory {
    height: 48px;
    margin: 0.5rem 0;
    background: var(--primary-lighter);
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 0.65rem;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.skeleton-directory-item {
    height: 10px;
    width: 75%;
    background: rgba(0, 0, 0, 0.04);
    border-radius: 4px;
}

.skeleton-directory-item:nth-child(2) { width: 60%; }
.skeleton-directory-item:nth-child(3) { width: 70%; }

.skeleton-badges {
    display: flex;
    gap: 6px;
    margin: 0;
    align-items: center;
}

.skeleton-badge {
    height: 20px;
    border-radius: var(--border-radius-xs);
}

.skeleton-badge:nth-child(1) { width: 72px; }
.skeleton-badge:nth-child(2) { width: 48px; }
.skeleton-badge:nth-child(3) { width: 62px; }

.skeleton-time {
    height: 14px;
    width: 65px;
    margin-bottom: 0;
    opacity: 0.7;
}

/* ========== 无结果 ========== */
.no-results-container {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    padding: 3rem 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    max-width: 400px;
    margin: 3rem auto;
    animation: fadeInUp 0.3s ease-out;
}

.no-results-icon {
    width: 68px;
    height: 68px;
    background: var(--primary-lighter);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.no-results-icon i {
    font-size: 1.8rem;
    color: var(--primary-color);
    opacity: 0.6;
}

.no-results-title {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
}

.no-results-text {
    color: var(--text-secondary);
    font-size: 0.82rem;
    max-width: 260px;
    margin: 0 auto;
}

.no-results-container .btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
    background: transparent;
    transition: all var(--transition-fast) ease;
    padding: 0.4rem 0.9rem;
    font-size: 0.8rem;
    border-radius: var(--border-radius-sm);
}

.no-results-container .btn-outline-primary:hover {
    background: var(--primary-color);
    color: #fff;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== 通用按钮 ========== */
.btn {
    transition: all var(--transition-fast) ease;
}

.btn:active {
    transform: scale(0.97);
}

/* ========== 文件标题图标颜色 ========== */
.file-title i.bi-folder-fill { color: #F59E0B; }
.file-title i.bi-camera-video-fill { color: #EF4444; }
.file-title i.bi-music-note-beamed { color: #10B981; }
.file-title i.bi-image-fill { color: #06B6D4; }
.file-title i.bi-file-earmark-text-fill { color: #8B5CF6; }
.file-title i.bi-windows { color: #3B82F6; }
.file-title i.bi-file-earmark-zip-fill { color: #F97316; }
.file-title i.bi-file-earmark { color: #6B7280; }

/* 资源类型图标 */
.resource-type-icon {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-xs);
    background: var(--bg-color);
    margin-right: 8px;
    flex-shrink: 0;
    transition: all var(--transition-fast) ease;
}

.resource-type-icon i { font-size: 1rem; }
.resource-type-icon[data-type="folder"] i { color: #F59E0B; }
.resource-type-icon[data-type="video"] i { color: #EF4444; }
.resource-type-icon[data-type="music"] i { color: #10B981; }
.resource-type-icon[data-type="image"] i { color: #06B6D4; }
.resource-type-icon[data-type="document"] i { color: #8B5CF6; }
.resource-type-icon[data-type="software"] i { color: #3B82F6; }
.resource-type-icon[data-type="archive"] i { color: #F97316; }
.resource-type-icon[data-type="other"] i { color: #6B7280; }

/* ========== 搜索中状态 ========== */
.search-input.searching {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { box-shadow: none; }
    50% { box-shadow: 0 0 0 4px rgba(79, 110, 247, 0.12); }
    100% { box-shadow: none; }
}

/* ========== 下拉菜单动画 ========== */
.dropdown-menu {
    transform-origin: top;
    animation-duration: 0.15s !important;
}

.dropdown-toggle.selected {
    animation: selectPop 0.2s ease;
}

.dropdown-toggle.reset {
    animation: resetShake 0.2s ease;
}

@keyframes selectPop {
    50% { transform: scale(1.02); }
}

@keyframes resetShake {
    25% { transform: translateX(-2px); }
    75% { transform: translateX(2px); }
}

/* ========== 自定义滚动条 ========== */
::-webkit-scrollbar {
    width: 5px;
    height: 5px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.18);
}

/* ========== 文本辅助 ========== */
.text-muted {
    color: var(--text-secondary) !important;
}

.text-primary {
    color: var(--primary-color) !important;
}

/* ========== 表格徽章辅助 ========== */
td .badge {
    vertical-align: middle;
}

/* ========== 移动端响应式 ========== */
@media (max-width: 768px) {
    .navbar > .container {
        flex-wrap: nowrap;
        gap: 0.5rem;
        padding-top: 0.6rem;
        padding-bottom: 0.6rem;
    }

    .navbar-brand {
        font-size: 1.15rem !important;
    }

    .search-box-wrapper {
        max-width: 260px;
    }

    main.container {
        padding-top: 1rem;
    }

    .filter-bar {
        padding: 0.55rem 0.75rem;
        margin-bottom: 1rem;
    }

    .filter-row {
        gap: 6px;
    }

    .filter-dropdown,
    .btn-clear-filter {
        height: 30px;
        font-size: 0.76rem;
        padding: 0 10px;
    }

    .resource-card-inner {
        padding: 0.85rem 0.95rem;
    }

    .resource-header {
        flex-direction: column;
        gap: 4px;
        margin-bottom: 0.4rem;
    }

    .resource-date {
        padding-top: 0;
    }

    .resource-footer {
        flex-direction: row;
        align-items: center;
        gap: 8px;
    }

    .resource-go-btn {
        align-self: center;
    }

    .back-to-top {
        bottom: 18px;
        right: 14px;
        width: 36px;
        height: 36px;
    }

    .pagination .page-link {
        padding: 0.25rem 0.5rem;
        min-width: 30px;
        height: 28px;
        font-size: 0.76rem;
    }

    .no-results-container {
        padding: 2rem 1.5rem;
        margin: 2rem auto;
    }
}

@media (max-width: 480px) {
    .navbar-brand {
        font-size: 1.05rem !important;
    }

    .search-input {
        font-size: 0.82rem !important;
        padding-left: 2rem !important;
    }

    .search-btn {
        padding: 0.45rem 0.85rem;
        font-size: 0.82rem;
    }

    .filter-row {
        gap: 4px;
    }

    .filter-dropdown,
    .btn-clear-filter {
        height: 28px;
        font-size: 0.72rem;
        padding: 0 8px;
    }

    .search-results {
        gap: 10px;
    }

    .resource-card-inner {
        padding: 0.75rem 0.85rem;
    }
}