:root {
    /* 云蓝色系 - 清透现代 */
    --primary: #4A9FE5;
    --primary-dark: #3A8BD4;
    --primary-light: #6BB3F0;
    --primary-bg: #EBF5FC;
    
    /* 纯净白系列 */
    --white: #FFFFFF;
    --gray-50: #FAFBFC;
    --gray-100: #F5F7FA;
    --gray-200: #EEF1F5;
    --gray-300: #DEE2E8;
    --gray-400: #BCC3CE;
    --gray-500: #9AA1AE;
    --gray-600: #6C7585;
    --gray-700: #495060;
    --gray-800: #333B48;
    --gray-900: #1E2530;
    
    /* 状态色 - 柔和版 */
    --success: #52C479;
    --danger: #FF6B6B;
    --warning: #FFB347;
    --info: #5AC8FA;
    
    /* 阴影 - 极轻盈 */
    --shadow-sm: 0 1px 3px rgba(74, 159, 229, 0.04);
    --shadow: 0 1px 6px rgba(74, 159, 229, 0.06);
    --shadow-md: 0 2px 10px rgba(74, 159, 229, 0.08);
    --shadow-lg: 0 4px 20px rgba(74, 159, 229, 0.1);
    
    --radius: 10px;
    --radius-lg: 14px;
    --transition: all 0.25s ease;
}

* {
    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(--white);
    color: var(--gray-900);
    line-height: 1.6;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background: var(--white);
    color: var(--gray-900);
    z-index: 1000;
    overflow-y: auto;
    transition: var(--transition);
    border-right: 1px solid var(--gray-200);
    box-shadow: 2px 0 12px rgba(74, 159, 229, 0.06);
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--gray-200);
    background: var(--primary-bg);
}

.sidebar-header h5 {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
    color: var(--primary-dark);
}

.sidebar-nav {
    padding: 16px 0;
}

.sidebar-nav .nav-item {
    padding: 0 12px;
    margin-bottom: 4px;
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--gray-600);
    text-decoration: none;
    border-radius: var(--radius);
    transition: var(--transition);
}

.sidebar-nav .nav-link:hover {
    background: var(--primary-bg);
    color: var(--primary);
}

.sidebar-nav .nav-link.active {
    background: var(--primary-bg);
    color: var(--primary);
    font-weight: 600;
    border-left: 3px solid var(--primary);
}

.sidebar-nav .nav-link i {
    width: 24px;
    margin-right: 12px;
    text-align: center;
}

.main-content {
    margin-left: 280px;
    min-height: 100vh;
    padding: 24px;
}

.content-header {
    margin-bottom: 24px;
}

.content-header h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--gray-900);
}

.content-header p {
    color: var(--gray-600);
    margin-top: 4px;
}

.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    margin-bottom: 24px;
}

.card-header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 24px;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-header h5 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
}

.card-body {
    padding: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

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

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

.btn-outline-primary {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

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

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

.btn-success:hover {
    background: #43A047;
    color: var(--white);
}

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

.btn-danger:hover {
    background: #E53935;
    color: var(--white);
}

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

.btn-warning:hover {
    background: #F57C00;
    color: var(--white);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

.form-control {
    display: block;
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    transition: var(--transition);
    background: var(--white);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 159, 229, 0.12);
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
}

.form-select {
    display: block;
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    transition: var(--transition);
    background: var(--white);
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 159, 229, 0.12);
}

.table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.table th {
    background: var(--primary-bg);
    padding: 16px 18px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-dark);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    border-bottom: 2px solid var(--primary-light);
}

.table td {
    padding: 16px 18px;
    font-size: 14px;
    border-bottom: 1px solid var(--gray-200);
    vertical-align: middle;
    color: var(--gray-800);
    white-space: nowrap;
}

/* 斑马纹 */
.table tbody tr:nth-child(even) {
    background: var(--gray-50);
}

.table tbody tr:hover {
    background: var(--primary-bg);
    transition: background 0.2s ease;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 500;
    border-radius: 20px;
}

.badge-success {
    background: rgba(76, 175, 80, 0.1);
    color: #2E7D32;
}

.badge-danger {
    background: rgba(244, 67, 54, 0.1);
    color: #C62828;
}

.badge-warning {
    background: rgba(255, 152, 0, 0.1);
    color: #E65100;
}

.badge-info {
    background: rgba(33, 150, 243, 0.1);
    color: #1565C0;
}

.badge-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.alert {
    padding: 14px 20px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
}

.alert-success {
    background: rgba(76, 175, 80, 0.1);
    color: #2E7D32;
    border: 1px solid rgba(76, 175, 80, 0.2);
}

.alert-danger {
    background: rgba(244, 67, 54, 0.1);
    color: #C62828;
    border: 1px solid rgba(244, 67, 54, 0.2);
}

.alert-warning {
    background: rgba(255, 152, 0, 0.1);
    color: #E65100;
    border: 1px solid rgba(255, 152, 0, 0.2);
}

.alert-info {
    background: rgba(33, 150, 243, 0.1);
    color: #1565C0;
    border: 1px solid rgba(33, 150, 243, 0.2);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-dialog {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    margin: 16px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h5 {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--gray-200);
}

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

.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius);
    background: var(--white);
    color: var(--gray-700);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
    border: 1px solid var(--gray-300);
}

.page-link:hover {
    background: var(--gray-100);
    color: var(--gray-900);
}

.page-link.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: var(--white);
    animation: spin 1s linear infinite;
}

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

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

.input-group-text {
    background: var(--gray-50);
    border: 1px solid var(--gray-300);
    color: var(--gray-600);
}

.input-group .form-control:focus {
    z-index: 2;
}

.loading-overlay .spinner {
    width: 40px;
    height: 40px;
    border-color: rgba(74, 159, 229, 0.18);
    border-top-color: var(--primary);
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .card-body {
        padding: 16px;
    }
    
    .table-responsive {
        overflow-x: auto;
    }
}

/* 用户详情弹窗样式 */
.detail-section {
    margin-bottom: 20px;
}

.detail-section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-dark);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--gray-200);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px 16px;
}

.detail-item {
    display: flex;
    flex-direction: column;
    padding: 6px 0;
}

.detail-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 2px;
}

.detail-value {
    font-size: 13px;
    color: var(--gray-800);
    word-break: break-all;
}

.device-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 14px;
    margin-bottom: 12px;
}

.device-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.device-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-800);
}

/* 操作按钮组 */
.btn-group-actions {
    display: flex;
    gap: 4px;
    flex-wrap: nowrap;
}

/* 信息提示 badge */
.badge-info {
    background: rgba(33, 150, 243, 0.1);
    color: #1565C0;
}

/* 模态框内容滚动 */
.modal-body {
    max-height: 60vh;
    overflow-y: auto;
}

.modal-body::-webkit-scrollbar {
    width: 6px;
}

.modal-body::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: 3px;
}

.modal-body::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 3px;
}

.modal-body::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* 时长管理切换按钮 */
.time-mode-switch {
    display: flex;
    gap: 0;
    margin-bottom: 20px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    overflow: hidden;
}

.time-mode-btn {
    flex: 1;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    background: var(--white);
    color: var(--gray-600);
    text-align: center;
}

.time-mode-btn:first-child {
    border-right: 1px solid var(--gray-300);
}

.time-mode-btn:hover {
    background: var(--gray-50);
}

.time-mode-btn.active {
    background: var(--primary);
    color: var(--white);
    font-weight: 600;
}

/* 操作按钮统一为文字+背景色 */
.table .btn-sm {
    padding: 5px 12px;
    font-size: 13px;
    font-weight: 500;
    border-radius: 6px;
    border: none;
    letter-spacing: 0.3px;
}

/* 禁用按钮样式 */
.table .btn-sm[disabled] {
    background: var(--gray-200);
    color: var(--gray-400);
    cursor: not-allowed;
    opacity: 0.7;
}

@media (max-width: 600px) {
    .detail-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-dialog {
        max-width: 100% !important;
        margin: 8px;
    }
}