/* ==================== 全局变量和重置 ==================== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;

    --bg-body: #f1f5f9;
    --bg-white: #ffffff;
    --bg-sidebar: #1e293b;
    --bg-sidebar-hover: #334155;

    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-white: #ffffff;
    --text-sidebar: #cbd5e1;

    --border-color: #e2e8f0;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -2px rgba(0,0,0,.05);

    --sidebar-width: 250px;
    --topbar-height: 64px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.5;
}

/* ==================== 登录页面 ==================== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 420px;
    background: var(--bg-white);
    border-radius: 16px;
    padding: 48px 40px;
    box-shadow: var(--shadow-lg);
}

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

.logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    margin-bottom: 20px;
}

.logo svg {
    filter: drop-shadow(0 2px 4px rgba(0,0,0,.1));
}

.login-header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

.login-form .form-group {
    margin-bottom: 24px;
}

.login-form label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-form input[type="text"],
.login-form input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 15px;
    transition: all .2s ease;
    outline: none;
}

.login-form input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,.1);
}

.password-wrapper {
    position: relative;
}

.password-wrapper input {
    padding-right: 48px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    padding: 4px;
    display: flex;
    align-items: center;
}

/* ==================== 按钮系统 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all .2s ease;
    white-space: nowrap;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--text-white);
}
.btn-primary:hover { box-shadow: 0 4px 12px rgba(99,102,241,.4); }

.btn-success { background: var(--success); color: white; }
.btn-warning { background: var(--warning); color: white; }
.btn-danger { background: var(--danger); color: white; }

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--border-color);
    color: var(--text-primary);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-block { width: 100%; }

.btn-icon {
    width: 40px; height: 40px;
    border: none;
    background: var(--bg-white);
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text-secondary);
    transition: all .2s;
}
.btn-icon:hover { background: var(--bg-body); color: var(--primary); }

/* ==================== 主布局 ==================== */
.main-layout {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    color: var(--text-sidebar);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
    transition: transform .3s ease;
}

.sidebar-header {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}

.sidebar-header span {
    font-size: 17px;
    font-weight: 700;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 12px 0;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 24px;
    color: var(--text-sidebar);
    text-decoration: none;
    font-size: 14px;
    transition: all .2s;
    border-left: 3px solid transparent;
}

.sidebar-nav li a:hover {
    background: var(--bg-sidebar-hover);
    color: var(--text-white);
}

.sidebar-nav li a.active {
    background: rgba(99,102,241,.15);
    color: var(--primary-light);
    border-left-color: var(--primary-light);
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(255,255,255,.08);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.user-info .avatar {
    width: 34px; height: 34px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--bg-sidebar-hover);
}

.user-info .name {
    font-size: 13px;
    font-weight: 500;
}

.btn-logout {
    width: 100%;
    padding: 8px;
    border: 1px solid rgba(255,255,255,.15);
    background: transparent;
    color: var(--text-sidebar);
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: all .2s;
}
.btn-logout:hover { background: rgba(239,68,68,.2); color: #fca5a5; border-color: rgba(239,68,68,.3); }

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

.top-bar {
    height: var(--topbar-height);
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 16px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 8px;
}

.breadcrumb {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-actions {
    margin-left: auto;
    display: flex;
    gap: 8px;
}

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

/* ==================== 数据看板 ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 16px;
    transition: transform .2s, box-shadow .2s;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.stat-icon {
    width: 56px; height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: white;
    flex-shrink: 0;
}
.stat-icon.purple { background: linear-gradient(135deg, #667eea, #764ba2); }
.stat-icon.green { background: linear-gradient(135deg, #11998e, #38ef7d); }
.stat-icon.orange { background: linear-gradient(135deg, #f093fb, #f5576c); }
.stat-icon.blue { background: linear-gradient(135deg, #4facfe, #00f2fe); }

.stat-info h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}
.stat-info p {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* 图表区域 */
.chart-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.card {
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.card-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.card-body {
    padding: 24px;
}

/* 简易图表容器 */
.chart-container {
    width: 100%;
    height: 300px;
    position: relative;
}

.bar-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 260px;
    padding: 0 10px;
}

.bar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    flex: 1;
}

.bar {
    width: 36px;
    background: linear-gradient(to top, var(--primary), var(--primary-light));
    border-radius: 4px 4px 0 0;
    min-height: 4px;
    transition: height .5s ease;
}

.bar-label {
    font-size: 11px;
    color: var(--text-secondary);
    text-align: center;
}

.bar-value {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 最近操作列表 */
.recent-list {
    max-height: 320px;
    overflow-y: auto;
}

.recent-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    border-bottom: 1px solid var(--border-color);
}
.recent-item:last-child { border-bottom: none; }

.recent-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--primary);
    flex-shrink: 0;
}
.recent-dot.success { background: var(--success); }
.recent-dot.warning { background: var(--warning); }
.recent-dot.danger { background: var(--danger); }

.recent-info { flex: 1; min-width: 0; }
.recent-info strong { font-size: 13px; color: var(--text-primary); display: block; }
.recent-info span { font-size: 12px; color: var(--text-secondary); }

.recent-time {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
}

/* ==================== 表格和列表页 ==================== */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}
.page-header h2 { font-size: 20px; font-weight: 700; }
.page-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* 搜索筛选栏 */
.filter-bar {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 18px 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
}
.filter-group label {
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.filter-input {
    padding: 8px 14px;
    border: 1.5px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    min-width: 180px;
    transition: border-color .2s;
}
.filter-input:focus { border-color: var(--primary); }

select.filter-input {
    min-width: 140px;
    appearance: auto;
}

/* 表格 */
.table-container {
    background: var(--bg-white);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

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

thead {
    background: #f8fafc;
}

th {
    padding: 14px 16px;
    text-align: left;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

td {
    padding: 14px 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

tr:hover td { background: #fafbfc; }

tr:last-child td { border-bottom: none; }

.table-img {
    width: 60px; height: 42px;
    border-radius: 6px;
    object-fit: cover;
}

/* 标签 */
.tag {
    display: inline-flex;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}
.tag-primary { background: #ede9fe; color: #6d28d9; }
.tag-success { background: #d1fae5; color: #059669; }
.tag-warning { background: #fef3c7; color: #b45309; }
.tag-danger { background: #fee2e2; color: #dc2626; }
.tag-default { background: #f1f5f9; color: #64748b; }

/* 操作按钮组 */
.action-btns {
    display: flex;
    gap: 6px;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4px;
    padding: 20px;
}

.pagination button {
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    background: var(--bg-white);
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: all .2s;
}
.pagination button:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.pagination button.active { background: var(--primary); color: white; border-color: var(--primary); }
.pagination button:disabled { opacity: .5; cursor: not-allowed; }
.pagination .page-info { font-size: 13px; color: var(--text-secondary); margin: 0 12px; }

/* ==================== 表单（模态框内） ==================== */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1.5px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    transition: border-color .2s;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(99,102,241,.1); }

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

select.form-control { appearance: auto; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* 图片上传预览 */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    transition: all .2s;
    background: #fafafa;
}
.upload-area:hover { border-color: var(--primary); background: #f5f3ff; }
.upload-preview img {
    max-width: 200px;
    max-height: 120px;
    border-radius: 8px;
    margin-top: 10px;
}

/* ==================== 模态框 ==================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    animation: fadeIn .2s ease;
}

.modal {
    background: var(--bg-white);
    border-radius: 16px;
    width: 100%;
    max-width: 680px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    animation: slideUp .25s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}
.modal-header h3 { font-size: 17px; font-weight: 600; }

.modal-close {
    width: 32px; height: 32px;
    border: none;
    background: var(--bg-body);
    border-radius: 8px;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-close:hover { background: var(--danger); color: white; }

.modal-body {
    padding: 24px;
    overflow-y: auto;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* ==================== Toast 提示 ==================== */
.toast-container {
    position: fixed;
    top: 80px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 14px 20px;
    border-radius: 10px;
    background: var(--text-primary);
    color: white;
    font-size: 14px;
    box-shadow: var(--shadow-lg);
    animation: slideInRight .3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 280px;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}
.empty-state svg {
    width: 120px; height: 120px;
    opacity: .3;
    margin-bottom: 16px;
}
.empty-state h3 { font-size: 16px; margin-bottom: 8px; }
.empty-state p { font-size: 14px; }

/* 加载状态 */
.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}
.spinner {
    width: 36px; height: 36px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}

/* ==================== 动画 ==================== */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes slideInRight { from { transform: translateX(100%); } to { transform: translateX(0); } }
@keyframes spin { to { transform: rotate(360deg); } }

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .chart-row { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    :root { --sidebar-width: 0px; }

    .menu-toggle { display: flex; }

    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }
    .sidebar.open { transform: translateX(0); }

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

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

    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }
    .filter-input { min-width: auto; width: 100%; }

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

    table { min-width: 700px; }

    .page-header { flex-direction: column; align-items: stretch; }

    .modal { max-width: 100%; margin: 10px; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr; }
    
    .content-area { padding: 16px; }

    .login-container { padding: 32px 24px; }

    .stat-card { padding: 18px; }
    .stat-info h3 { font-size: 22px; }
}

/* 滚动条美化 */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* 开关按钮 */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.switch-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: #ccc;
    border-radius: 24px;
    transition: .3s;
}
.switch-slider::before {
    content: "";
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: .3s;
}
.switch input:checked + .switch-slider { background: var(--success); }
.switch input:checked + .switch-slider::before { transform: translateX(20px); }