:root {
    --admin-primary: #4f46e5;
    --admin-primary-light: #818cf8;
    --admin-bg: #f1f5f9;
    --admin-sidebar-bg: #1e293b;
    --admin-sidebar-text: #94a3b8;
    --admin-sidebar-active: #4f46e5;
    --admin-card-bg: #ffffff;
    --admin-border: #e2e8f0;
    --admin-text: #1e293b;
    --admin-text-secondary: #64748b;
    --admin-success: #10b981;
    --admin-warning: #f59e0b;
    --admin-danger: #ef4444;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--admin-bg);
    color: var(--admin-text);
}

.admin-wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.admin-sidebar {
    width: 240px;
    background: var(--admin-sidebar-bg);
    color: var(--admin-sidebar-text);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-header i {
    font-size: 28px;
    color: var(--admin-primary-light);
}

.sidebar-header span {
    color: #fff;
    font-size: 18px;
    font-weight: 700;
}

.sidebar-header small {
    color: var(--admin-sidebar-text);
    font-size: 12px;
}

.sidebar-nav {
    padding: 12px 10px;
    flex: 1;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 14px;
    border-radius: 8px;
    color: var(--admin-sidebar-text);
    text-decoration: none;
    font-size: 13px;
    margin-bottom: 2px;
    transition: all 0.2s;
}

.nav-item i {
    font-size: 16px;
    width: 18px;
    text-align: center;
}

.nav-item:hover {
    background: rgba(255,255,255,0.08);
    color: #fff;
}

.nav-item.active {
    background: var(--admin-sidebar-active);
    color: #fff;
}

/* 手风琴分组 */
.nav-group {
    margin-top: 4px;
}

.nav-group-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    border-radius: 8px;
    color: #cbd5e1;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s;
}

.nav-group-header i:first-child {
    font-size: 16px;
    width: 18px;
    text-align: center;
    color: var(--admin-primary-light);
}

.nav-group-header:hover {
    background: rgba(255,255,255,0.06);
    color: #fff;
}

.nav-arrow {
    margin-left: auto;
    font-size: 12px !important;
    width: auto !important;
    color: #64748b;
    transition: transform 0.25s ease;
}

.nav-group.open .nav-arrow {
    transform: rotate(180deg);
}

.nav-group-items {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding-left: 8px;
}

.nav-group.open .nav-group-items {
    max-height: 600px;
}

.nav-group-items .nav-item {
    font-size: 13px;
    padding: 7px 14px;
    color: #94a3b8;
}

.nav-group-items .nav-item i {
    font-size: 15px;
}

.nav-group-items .nav-item.active {
    color: #fff;
}

/* Main */
.admin-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.admin-topbar {
    background: #fff;
    border-bottom: 1px solid var(--admin-border);
    padding: 16px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

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

.admin-user {
    display: flex;
    align-items: center;
    gap: 8px;
}

.admin-name {
    font-weight: 500;
    color: var(--admin-text);
}

.admin-role {
    background: var(--admin-primary);
    color: #fff;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
}

.btn-logout {
    color: var(--admin-text-secondary);
    text-decoration: none;
    font-size: 14px;
    padding: 6px 12px;
    border-radius: 6px;
    transition: all 0.2s;
}

.btn-logout:hover {
    background: var(--admin-bg);
    color: var(--admin-danger);
}

/* Content */
.admin-content {
    padding: 28px;
    flex: 1;
    overflow-y: auto;
}

/* Cards */
.admin-card {
    background: var(--admin-card-bg);
    border-radius: 12px;
    border: 1px solid var(--admin-border);
    padding: 24px;
    margin-bottom: 20px;
}

.admin-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.admin-card-title {
    font-size: 16px;
    font-weight: 600;
    margin: 0;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--admin-border);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.blue { background: #dbeafe; color: #1d4ed8; }
.stat-icon.green { background: #d1fae5; color: #059669; }
.stat-icon.orange { background: #fed7aa; color: #ea580c; }
.stat-icon.purple { background: #ede9fe; color: #7c3aed; }
.stat-icon.red { background: #fee2e2; color: #dc2626; }

.stat-info h3 {
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 4px;
}

.stat-info p {
    margin: 0;
    color: var(--admin-text-secondary);
    font-size: 13px;
}

/* Tables */
.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th {
    text-align: left;
    padding: 12px 16px;
    background: var(--admin-bg);
    font-weight: 600;
    font-size: 13px;
    color: var(--admin-text-secondary);
    border-bottom: 1px solid var(--admin-border);
}

.admin-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--admin-border);
    font-size: 14px;
}

.admin-table tr:hover td {
    background: #f8fafc;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #dbeafe; color: #1e40af; }
.badge-secondary { background: #e2e8f0; color: #475569; }

/* Buttons */
.btn-primary {
    background: var(--admin-primary);
    color: #fff;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover { background: #4338ca; color: #fff; }
.btn-success { background: var(--admin-success); color: #fff; }
.btn-success:hover { background: #059669; color: #fff; }
.btn-danger { background: var(--admin-danger); color: #fff; }
.btn-danger:hover { background: #dc2626; color: #fff; }
.btn-warning { background: var(--admin-warning); color: #fff; }
.btn-warning:hover { background: #d97706; color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-link { background: none; border: none; color: var(--admin-primary); cursor: pointer; padding: 4px 8px; }
.btn-link:hover { text-decoration: underline; }

/* Chart container */
.chart-container {
    position: relative;
    height: 300px;
}

/* Login page */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.login-card {
    width: 400px;
    background: #fff;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}

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

.login-header i {
    font-size: 48px;
    color: var(--admin-primary);
}

.login-header h1 {
    font-size: 22px;
    margin: 12px 0 4px;
}

.login-header p {
    color: var(--admin-text-secondary);
    margin: 0;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--admin-border);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--admin-primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

.btn-block {
    width: 100%;
    padding: 12px;
    font-size: 15px;
    font-weight: 600;
}

/* Search bar */
.search-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.search-bar .form-control {
    width: auto;
    min-width: 200px;
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: #fff;
    border-radius: 12px;
    width: 500px;
    max-width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--admin-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 18px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--admin-text-secondary);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--admin-border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* Alert */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-warning { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }

/* Avatar */
.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.avatar-sm { width: 28px; height: 28px; }

/* Utility */
.text-muted { color: var(--admin-text-secondary); }
.text-sm { font-size: 13px; }
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.d-flex { display: flex; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.w-100 { width: 100%; }