/* ========== 后台管理样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --sidebar-width: 220px;
    --primary: #1890ff;
    --primary-hover: #40a9ff;
    --danger: #ff4d4f;
    --success: #52c41a;
    --warning: #faad14;
    --text: #333;
    --text-secondary: #666;
    --text-muted: #999;
    --border: #e8e8e8;
    --bg: #f0f2f5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
}

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

.login-box {
    background: #fff;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    width: 380px;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 24px;
    color: var(--text);
    font-size: 20px;
}

.login-box h2 i {
    margin-right: 8px;
    color: var(--primary);
}

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

.login-box label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--text-secondary);
}

.login-box input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.login-box input:focus {
    border-color: var(--primary);
}

.btn-login-submit {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 8px;
}

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

.login-hint {
    text-align: center;
    margin-top: 16px;
    font-size: 12px;
    color: var(--text-muted);
}

/* ========== 后台布局 ========== */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: var(--sidebar-width);
    background: #001529;
    color: #fff;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
}

.sidebar-header i {
    margin-right: 8px;
}

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

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    color: #fff;
    background: var(--primary);
}

.sidebar-nav a i {
    width: 18px;
    text-align: center;
}

.sidebar-footer {
    padding: 12px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-footer a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    color: rgba(255, 255, 255, 0.45);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
}

.sidebar-footer a:hover {
    color: rgba(255, 255, 255, 0.85);
}

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

.admin-topbar {
    background: #fff;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.admin-topbar h1 {
    font-size: 18px;
    font-weight: 600;
}

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

.admin-user i {
    margin-right: 4px;
}

.admin-content {
    padding: 24px;
}

/* ========== Flash消息 ========== */
.flash-messages {
    margin-bottom: 16px;
}

.flash {
    padding: 10px 16px;
    border-radius: 8px;
    margin-bottom: 8px;
    font-size: 14px;
}

.flash-success {
    background: #f6ffed;
    border: 1px solid #b7eb8f;
    color: #52c41a;
}

.flash-error {
    background: #fff2f0;
    border: 1px solid #ffccc7;
    color: #ff4d4f;
}

/* ========== 统计卡片 ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    display: block;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
}

/* ========== 管理卡片 ========== */
.admin-card {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.card-header h3 {
    font-size: 16px;
    font-weight: 600;
}

/* ========== 数据表格 ========== */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid #f0f0f0;
    font-size: 13px;
}

.data-table th {
    background: #fafafa;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table tr:hover {
    background: #fafafa;
}

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

/* ========== 按钮 ========== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
}

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

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 20px;
    background: #fff;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

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

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    color: var(--primary);
    text-decoration: none;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: rgba(24, 144, 255, 0.08);
}

.btn-icon.btn-danger {
    color: var(--danger);
}

.btn-icon.btn-danger:hover {
    background: rgba(255, 77, 79, 0.08);
}

/* ========== 徽章 ========== */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.badge-green { background: #f6ffed; color: #52c41a; }
.badge-red { background: #fff2f0; color: #ff4d4f; }
.badge-blue { background: #e6f7ff; color: #1890ff; }
.badge-gray { background: #f5f5f5; color: #999; }

/* ========== 表单 ========== */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
    font-family: inherit;
}

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

.required {
    color: var(--danger);
}

.form-row {
    display: flex;
    gap: 16px;
}

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.checkbox-label input {
    width: auto !important;
}

.form-actions {
    display: flex;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    margin-top: 16px;
}

.admin-toolbar {
    margin-bottom: 16px;
}

.actions {
    white-space: nowrap;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .admin-sidebar {
        width: 60px;
    }

    .admin-sidebar .sidebar-header h2 span,
    .admin-sidebar .sidebar-nav a span,
    .admin-sidebar .sidebar-footer a span {
        display: none;
    }

    .admin-main {
        margin-left: 60px;
    }

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

    .form-row {
        flex-direction: column;
    }
}