/* ========== 总后台样式 ========== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --dark: #0f172a;
    --dark-800: #1e293b;
    --dark-700: #334155;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --white: #ffffff;
    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --radius: 10px;
    --radius-lg: 16px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--dark-700);
    background: var(--gray-100);
    line-height: 1.5;
}

/* ========== Logo ========== */
.logo-icon {
    display: flex;
    align-items: flex-end;
    gap: 3px;
    height: 24px;
}
.logo-icon .bar {
    width: 4px;
    background: var(--primary);
    border-radius: 2px;
}
.logo-icon .bar1 { height: 10px; }
.logo-icon .bar2 { height: 16px; background: var(--secondary); }
.logo-icon .bar3 { height: 24px; background: var(--accent); }

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

/* ========== 侧边栏 ========== */
.admin-sidebar {
    width: 260px;
    background: var(--white);
    border-right: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-100);
}
.sidebar-brand span {
    font-size: 17px;
    font-weight: 700;
    color: var(--dark);
}

.sidebar-nav {
    flex: 1;
    padding: 12px 16px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    margin-bottom: 4px;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
}
.nav-item i {
    width: 20px;
    text-align: center;
    font-size: 15px;
}
.nav-item:hover {
    background: var(--gray-50);
    color: var(--primary);
}
.nav-item.active {
    background: linear-gradient(135deg, rgba(99,102,241,0.1) 0%, rgba(139,92,246,0.08) 100%);
    color: var(--primary);
    font-weight: 600;
}

.nav-badge {
    margin-left: auto;
    background: var(--danger);
    color: var(--white);
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 9999px;
    min-width: 22px;
    text-align: center;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--gray-100);
}

.admin-info {
    display: flex;
    align-items: center;
    gap: 10px;
}
.admin-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
}
.admin-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark-700);
}
.admin-role {
    font-size: 12px;
    color: var(--gray-400);
}

/* ========== 主内容区 ========== */
.admin-main {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ========== 顶部栏 ========== */
.admin-topbar {
    height: 64px;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    position: sticky;
    top: 0;
    z-index: 50;
}
.admin-topbar h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.refresh-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    background: var(--white);
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: all 0.2s ease;
}
.refresh-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99,102,241,0.04);
}
.refresh-btn.spinning i {
    animation: spin 1s linear infinite;
}
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ========== 统计卡片 ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    position: relative;
    overflow: hidden;
}
.stat-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}
.stat-card.blue::before { background: var(--info); }
.stat-card.green::before { background: var(--success); }
.stat-card.purple::before { background: var(--secondary); }
.stat-card.orange::before { background: var(--warning); }

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}
.stat-card.blue .stat-icon { background: rgba(59,130,246,0.1); color: var(--info); }
.stat-card.green .stat-icon { background: rgba(16,185,129,0.1); color: var(--success); }
.stat-card.purple .stat-icon { background: rgba(139,92,246,0.1); color: var(--secondary); }
.stat-card.orange .stat-icon { background: rgba(245,158,11,0.1); color: var(--warning); }

.stat-info { flex: 1; }
.stat-num {
    font-size: 28px;
    font-weight: 800;
    color: var(--dark);
    line-height: 1.2;
}
.stat-label {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 4px;
}
.stat-trend {
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 9999px;
}
.stat-trend.up {
    background: rgba(16,185,129,0.1);
    color: var(--success);
}

/* ========== 内容区 ========== */
.admin-section {
    display: none;
    padding: 28px;
    animation: fadeIn 0.3s ease;
}
.admin-section.active { display: block; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== Dashboard 卡片 ========== */
.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-bottom: 28px;
}

.admin-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-100);
}
.card-header h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 8px;
}
.card-header h3 i { color: var(--primary); font-size: 14px; }

.card-tabs {
    display: flex;
    gap: 4px;
}
.card-tabs button {
    padding: 6px 14px;
    border: none;
    background: none;
    font-size: 13px;
    color: var(--gray-500);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
}
.card-tabs button.active,
.card-tabs button:hover {
    background: var(--gray-100);
    color: var(--primary);
    font-weight: 600;
}

.card-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.view-all {
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 4px;
}

.chart-container {
    padding: 20px 24px;
    height: 300px;
}
.chart-container canvas { width: 100%; height: 100%; }

.pie-chart {
    display: flex;
    align-items: center;
    gap: 24px;
}

.pie-legend {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--gray-600);
}
.legend-item .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

/* ========== 表格 ========== */
.table-wrap { overflow-x: auto; }

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.data-table th {
    text-align: left;
    padding: 14px 20px;
    font-weight: 600;
    color: var(--gray-600);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    white-space: nowrap;
}
.data-table td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--gray-100);
    color: var(--dark-700);
    white-space: nowrap;
}
.data-table tbody tr:hover { background: var(--gray-50); }

.empty-state {
    text-align: center;
    color: var(--gray-400);
    padding: 40px !important;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 12px;
    font-weight: 600;
}
.status-badge.active {
    background: rgba(16,185,129,0.1);
    color: var(--success);
}
.status-badge.inactive {
    background: rgba(148,163,184,0.1);
    color: var(--gray-500);
}
.status-badge.banned {
    background: rgba(239,68,68,0.1);
    color: var(--danger);
}

.action-btn {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    border: none;
    background: none;
    color: var(--gray-400);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s ease;
    margin-right: 4px;
}
.action-btn:hover {
    background: var(--gray-100);
    color: var(--primary);
}
.action-btn.danger:hover {
    background: rgba(239,68,68,0.1);
    color: var(--danger);
}

/* ========== 搜索框 ========== */
.search-box {
    position: relative;
    display: flex;
    align-items: center;
}
.search-box i {
    position: absolute;
    left: 12px;
    color: var(--gray-400);
    font-size: 13px;
}
.search-box input {
    padding: 8px 12px 8px 34px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 13px;
    outline: none;
    width: 220px;
    transition: all 0.25s ease;
}
.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

/* ========== 筛选器 ========== */
.filter-group {
    display: flex;
    gap: 8px;
}
.filter-group select {
    padding: 8px 12px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 13px;
    outline: none;
    background: var(--white);
    color: var(--gray-600);
    cursor: pointer;
}
.filter-group select:focus {
    border-color: var(--primary);
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    border: none;
    outline: none;
    white-space: nowrap;
}
.btn-primary {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(99,102,241,0.35);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99,102,241,0.45);
}
.btn-outline {
    background: var(--white);
    color: var(--gray-600);
    border: 1.5px solid var(--gray-200);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(99,102,241,0.04);
}
.btn-sm { padding: 6px 14px; font-size: 13px; }

/* ========== 分页 ========== */
.pagination {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 20px 24px;
    justify-content: flex-end;
}
.page-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: 1.5px solid var(--gray-200);
    background: var(--white);
    color: var(--gray-600);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.page-btn:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
}
.page-btn.active {
    background: var(--gradient);
    color: var(--white);
    border-color: transparent;
}
.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ========== 设置页 ========== */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.settings-form {
    padding: 24px;
}
.settings-form .form-group {
    margin-bottom: 20px;
}
.settings-form label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--dark-700);
    margin-bottom: 8px;
}
.settings-form input[type="text"],
.settings-form input[type="password"] {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 14px;
    outline: none;
    transition: all 0.25s ease;
}
.settings-form input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

.checkbox-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 14px;
    color: var(--gray-600);
}
.checkbox-wrap input { display: none; }
.checkmark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--gray-300);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}
.checkbox-wrap input:checked + .checkmark {
    background: var(--gradient);
    border-color: var(--primary);
}
.checkbox-wrap input:checked + .checkmark::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    color: var(--white);
    font-size: 10px;
}

/* ========== 弹窗 ========== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-overlay.active { display: flex; }

.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    max-width: 480px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.3s ease;
    overflow: hidden;
}
.modal-lg { max-width: 700px; }

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-100);
}
.modal-header h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
}
.modal-close {
    background: none;
    border: none;
    color: var(--gray-400);
    font-size: 18px;
    cursor: pointer;
    padding: 4px;
}
.modal-close:hover { color: var(--danger); }

.modal-body {
    padding: 24px;
}

.user-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.user-detail-item {
    padding: 12px;
    background: var(--gray-50);
    border-radius: var(--radius);
}
.user-detail-item label {
    font-size: 12px;
    color: var(--gray-500);
    display: block;
    margin-bottom: 4px;
}
.user-detail-item span {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark-700);
}

/* ========== Toast ========== */
.toast-container {
    position: fixed;
    top: 80px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary);
    animation: toastIn 0.3s ease;
    min-width: 280px;
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ========== 响应式 ========== */
@media (max-width: 1200px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .dashboard-grid { grid-template-columns: 1fr; }
    .settings-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .admin-sidebar { transform: translateX(-100%); }
    .admin-main { margin-left: 0; }
    .stats-grid { grid-template-columns: 1fr; }
    .user-detail-grid { grid-template-columns: 1fr; }
}


/* ========== 管理员登录界面 ========== */
.login-overlay {
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 50%, #fff0f5 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.login-box {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.4s ease;
}

.login-brand {
    text-align: center;
    margin-bottom: 32px;
}
.login-brand .logo-icon {
    justify-content: center;
    margin-bottom: 16px;
    height: 32px;
}
.login-brand h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}
.login-brand p {
    font-size: 14px;
    color: var(--gray-500);
}

.login-box .form-group {
    margin-bottom: 20px;
}
.login-box label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--dark-700);
    margin-bottom: 8px;
}
.login-box .input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}
.login-box .input-wrap i {
    position: absolute;
    left: 14px;
    color: var(--gray-400);
    font-size: 14px;
}
.login-box input {
    width: 100%;
    padding: 12px 14px 12px 42px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 14px;
    outline: none;
    transition: all 0.25s ease;
    background: var(--white);
    color: var(--dark-700);
}
.login-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}
.login-box input::placeholder {
    color: var(--gray-400);
}

.login-hint {
    text-align: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-100);
    font-size: 12px;
    color: var(--gray-500);
}
.login-hint strong {
    color: var(--primary);
}