/**
 * ============================================================
 * WordPress 风格后台管理系统样式表
 * 文件: css/admin.css
 * 说明: 完整的后台管理界面样式，包含导航栏、内容区、表格、表单等
 * ============================================================
 */

/* ==================== 基础重置与变量 ==================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主题色 */
    --primary-color: #2271b1;
    --primary-hover: #135e96;
    --danger-color: #d63638;
    --danger-hover: #b32d2e;
    --success-color: #46b450;
    --success-hover: #3a9e42;
    
    /* 导航栏 */
    --nav-bg: #23282d;
    --nav-hover: #32373c;
    --nav-text: #a0a5aa;
    --nav-active: #0073aa;
    
    /* 内容区 */
    --content-bg: #f1f1f1;
    --card-bg: #fff;
    --header-bg: #fff;
    
    /* 边框 */
    --border-light: #eee;
    --border-medium: #ccd0d4;
    --border-dark: #8c8f94;
    
    /* 文字 */
    --text-primary: #23282d;
    --text-secondary: #646970;
    --text-muted: #a0a5aa;
    
    /* 尺寸 */
    --nav-width: 220px;
    --header-height: 56px;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    background-color: var(--content-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

/* ==================== 左侧导航栏 ==================== */

.admin-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--nav-width);
    height: 100vh;
    background-color: var(--nav-bg);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform 0.3s ease;
    overflow-y: auto;
    overflow-x: hidden;
}

/* 导航栏顶部 Logo 区域 */
.nav-logo {
    padding: 16px;
    color: #fff;
    font-size: 18px;
    font-weight: 600;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 菜单列表 */
.nav-menu {
    flex: 1;
    padding: 8px 0;
}

/* 单个菜单项 */
.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: var(--nav-text);
    font-size: 14px;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
    white-space: nowrap;
}

.nav-item svg {
    width: 18px;
    height: 18px;
    margin-right: 12px;
    fill: currentColor;
    flex-shrink: 0;
}

/* 菜单项悬浮效果 */
.nav-item:hover {
    background-color: var(--nav-hover);
    color: #fff;
}

/* 菜单项激活状态 */
.nav-item.active {
    background-color: var(--nav-active);
    color: #fff;
    border-left-color: #fff;
}

/* 导航栏底部折叠按钮 */
.nav-toggle {
    padding: 12px 20px;
    color: var(--nav-text);
    font-size: 13px;
    cursor: pointer;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-toggle:hover {
    background-color: var(--nav-hover);
    color: #fff;
}

/* ==================== 右侧主内容区 ==================== */

.admin-main {
    margin-left: var(--nav-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s ease;
}

/* ==================== 顶部栏 ==================== */

.admin-header {
    height: var(--header-height);
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-medium);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.page-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-name {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ==================== 内容区域 ==================== */

.admin-content {
    flex: 1;
    padding: 24px 32px;
}

/* ==================== 卡片组件 ==================== */

.card {
    background-color: var(--card-bg);
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
    overflow: hidden;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: 20px;
}

/* ==================== 统计卡片（仪表盘） ==================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background-color: var(--card-bg);
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: box-shadow 0.2s ease;
}

.stat-card:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon svg {
    width: 24px;
    height: 24px;
    fill: #fff;
}

.stat-icon.blue {
    background-color: var(--primary-color);
}

.stat-icon.green {
    background-color: var(--success-color);
}

.stat-icon.orange {
    background-color: #f0ad4e;
}

.stat-icon.purple {
    background-color: #8564c8;
}

.stat-info {
    flex: 1;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* ==================== 快速入口 ==================== */

.quick-links {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.quick-link {
    display: flex;
    align-items: center;
    padding: 14px 16px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.2s ease;
    cursor: pointer;
}

.quick-link svg {
    width: 18px;
    height: 18px;
    margin-right: 10px;
    fill: var(--primary-color);
    flex-shrink: 0;
}

.quick-link:hover {
    border-color: var(--primary-color);
    box-shadow: 0 1px 3px rgba(34, 113, 177, 0.15);
    color: var(--primary-color);
}

/* ==================== 表格样式 ==================== */

.table-wrap {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead th {
    background-color: #f9f9f9;
    font-weight: 600;
    text-align: left;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-light);
    font-size: 14px;
    color: var(--text-primary);
    white-space: nowrap;
}

.data-table tbody tr {
    border-bottom: 1px solid #f0f0f0;
    transition: background-color 0.15s ease;
}

.data-table tbody tr:hover {
    background-color: #f9f9f9;
}

.data-table tbody td {
    padding: 12px 16px;
    font-size: 14px;
    color: var(--text-primary);
    vertical-align: middle;
}

/* 表格中的缩略图 */
.table-thumb {
    width: 60px;
    height: 40px;
    object-fit: cover;
    border-radius: 3px;
    border: 1px solid var(--border-light);
}

/* 表格中的操作按钮组 */
.table-actions {
    display: flex;
    gap: 6px;
    flex-wrap: nowrap;
}

/* 表格空状态 */
.table-empty {
    text-align: center;
    padding: 48px 20px;
    color: var(--text-muted);
}

.table-empty svg {
    width: 48px;
    height: 48px;
    fill: var(--border-medium);
    margin-bottom: 12px;
}

/* ==================== 按钮样式 ==================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 3px;
    font-size: 14px;
    font-weight: 400;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s ease;
    line-height: 1.5;
    white-space: nowrap;
    font-family: inherit;
}

.btn svg {
    width: 14px;
    height: 14px;
    fill: currentColor;
}

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

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

/* 次按钮 */
.btn-secondary {
    background-color: #f6f7f7;
    color: var(--text-primary);
    border-color: var(--border-medium);
}

.btn-secondary:hover {
    background-color: #e8e8e8;
    border-color: var(--border-dark);
}

/* 危险按钮 */
.btn-danger {
    background-color: var(--danger-color);
    color: #fff;
    border-color: var(--danger-color);
}

.btn-danger:hover {
    background-color: var(--danger-hover);
    border-color: var(--danger-hover);
}

/* 成功按钮 */
.btn-success {
    background-color: var(--success-color);
    color: #fff;
    border-color: var(--success-color);
}

.btn-success:hover {
    background-color: var(--success-hover);
    border-color: var(--success-hover);
}

/* 小按钮 */
.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

/* 按钮禁用状态 */
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 工具栏按钮组 */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.toolbar-left,
.toolbar-right {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* ==================== 表单样式 ==================== */

.form-group {
    margin-bottom: 16px;
}

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

.form-label .required {
    color: var(--danger-color);
    margin-left: 2px;
}

/* 文本输入框 */
.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-dark);
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text-primary);
    background-color: #fff;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 1px var(--primary-color);
}

/* 多行文本框 */
.form-textarea {
    min-height: 200px;
    resize: vertical;
    line-height: 1.6;
}

/* 代码编辑区域 */
.form-textarea.code {
    font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
    font-size: 13px;
    line-height: 1.5;
}

/* 表单提示文字 */
.form-hint {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* 表单行（两列布局） */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* ==================== 图片网格（媒体库） ==================== */

.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.media-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: 4px;
    overflow: hidden;
    transition: box-shadow 0.2s ease;
    position: relative;
}

.media-item:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
    border-color: var(--border-medium);
}

.media-thumb {
    width: 100%;
    height: 140px;
    object-fit: cover;
    display: block;
    background-color: #f5f5f5;
}

.media-info {
    padding: 10px 12px;
}

.media-name {
    font-size: 13px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 8px;
}

.media-actions {
    display: flex;
    gap: 6px;
}

/* 上传区域 */
.upload-area {
    border: 2px dashed var(--border-medium);
    border-radius: 4px;
    padding: 40px 20px;
    text-align: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    cursor: pointer;
    margin-bottom: 24px;
    background-color: #fafafa;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(34, 113, 177, 0.05);
    color: var(--primary-color);
}

.upload-area svg {
    width: 48px;
    height: 48px;
    fill: currentColor;
    margin-bottom: 12px;
}

.upload-area p {
    font-size: 14px;
    margin-bottom: 4px;
}

.upload-area small {
    font-size: 12px;
    color: var(--text-muted);
}

/* ==================== Toast 提示 ==================== */

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 12px 20px;
    border-radius: 4px;
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    animation: slideInRight 0.3s ease forwards;
    max-width: 320px;
    word-break: break-word;
}

.toast.success {
    background-color: var(--success-color);
}

.toast.error {
    background-color: var(--danger-color);
}

.toast.info {
    background-color: var(--primary-color);
}

.toast.hiding {
    animation: fadeOut 0.3s ease forwards;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* ==================== 确认对话框 ==================== */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9998;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

.modal-box {
    background-color: #fff;
    border-radius: 4px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 420px;
    animation: slideUp 0.2s ease;
}

.modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-light);
}

.modal-title {
    font-size: 16px;
    font-weight: 600;
}

.modal-body {
    padding: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.modal-footer {
    padding: 12px 20px 16px;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ==================== 移动端菜单按钮 ==================== */

.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 1001;
    width: 36px;
    height: 36px;
    background-color: var(--nav-bg);
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 18px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    padding: 0;
}

/* ==================== 导航栏遮罩（移动端） ==================== */

.nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

/* ==================== 响应式布局 ==================== */

/* iPad (<=1024px) */
@media screen and (max-width: 1024px) {
    :root {
        --nav-width: 180px;
    }

    .admin-content {
        padding: 20px 24px;
    }

    .stats-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}

/* 手机 (<=768px) */
@media screen and (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .admin-nav {
        transform: translateX(-100%);
    }

    .admin-nav.open {
        transform: translateX(0);
    }

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

    .admin-header {
        padding: 0 16px 0 56px;
    }

    .admin-content {
        padding: 16px;
    }

    .nav-overlay.open {
        display: block;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .stat-value {
        font-size: 22px;
    }

    .toolbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .data-table {
        font-size: 13px;
    }

    .table-actions {
        flex-direction: column;
        gap: 4px;
    }

    .media-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 12px;
    }
}

/* 小屏手机 (<=480px) */
@media screen and (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

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

/* ==================== 编辑器页面特殊样式 ==================== */

.editor-form {
    max-width: 900px;
}

.video-list {
    margin-top: 12px;
}

.video-item {
    display: grid;
    grid-template-columns: 1fr auto auto auto;
    gap: 10px;
    align-items: center;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 4px;
    margin-bottom: 8px;
    border: 1px solid var(--border-light);
}

.video-item input {
    padding: 6px 10px;
    border: 1px solid var(--border-medium);
    border-radius: 3px;
    font-size: 13px;
    font-family: inherit;
}

.video-item input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* ==================== 辅助工具类 ==================== */

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

.text-secondary {
    color: var(--text-secondary);
}

.mb-0 {
    margin-bottom: 0;
}

.mb-1 {
    margin-bottom: 8px;
}

.mb-2 {
    margin-bottom: 16px;
}

.mt-1 {
    margin-top: 8px;
}

.mt-2 {
    margin-top: 16px;
}

.flex {
    display: flex;
}

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

/* 图片预览 */
.img-preview {
    max-width: 200px;
    max-height: 120px;
    border-radius: 4px;
    border: 1px solid var(--border-light);
    margin-top: 8px;
    object-fit: cover;
}

/* 加载中动画 */
.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* 面包屑导航 */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.breadcrumb a {
    color: var(--primary-color);
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb-separator {
    color: var(--text-muted);
}

/* 标签 */
.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 3px;
    font-size: 12px;
    font-weight: 500;
}

.tag-blue {
    background-color: rgba(34, 113, 177, 0.1);
    color: var(--primary-color);
}

.tag-green {
    background-color: rgba(70, 180, 80, 0.1);
    color: var(--success-color);
}