:root {
    --primary: #0066CC;
    --primary-dark: #0052A3;
    --secondary: #00A8A8;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --dark: #1F2937;
    --dark-lighter: #374151;
    --light-bg: #F9FAFB;
    --border-color: #E5E7EB;
    --shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
}

body {
    background: var(--light-bg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--dark);
}

/* Typography */
h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

h1:focus {
    outline: none;
}

.lead {
    font-size: 1.125rem;
    color: #6B7280;
    margin-bottom: 2rem;
}

/* Sidebar Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

.app-sidebar {
    width: 260px;
    background: white;
    border-right: 1px solid var(--border-color);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
}

.app-main {
    flex: 1;
    margin-left: 260px;
    padding: 2rem;
    min-height: 100vh;
}

.sidebar-brand {
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: block;
}

.sidebar-brand:hover {
    color: var(--primary-dark);
}

.sidebar-nav {
    padding: 1rem 0;
}

.sidebar-nav-item {
    display: block;
    padding: 0.75rem 1.25rem;
    color: #6B7280;
    text-decoration: none;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

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

.sidebar-nav-item.active {
    background: #EFF6FF;
    color: var(--primary);
    border-left-color: var(--primary);
    font-weight: 600;
}

.sidebar-user {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.sidebar-user-badge {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-user-avatar {
    flex-shrink: 0;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    letter-spacing: 0.05em;
    user-select: none;
}

.sidebar-user-info {
    min-width: 0;
    flex: 1;
}

.sidebar-user-name {
    font-size: 0.875rem;
    color: var(--dark);
    font-weight: 600;
    margin-bottom: 0.1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-email {
    font-size: 0.7rem;
    color: #9CA3AF;
    margin-bottom: 0.2rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-link {
    font-size: 0.75rem;
    color: #6B7280;
    text-decoration: none;
}

.sidebar-user-link:hover {
    color: var(--primary);
}

/* Cards */
.card {
    border: none;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    transition: box-shadow 0.3s, transform 0.3s;
    background: white;
    margin-bottom: 1.5rem;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.card-header {
    background: white;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0.75rem 0.75rem 0 0;
    padding: 1rem 1.25rem;
    font-weight: 600;
}

.card-body {
    padding: 1.25rem;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.card-text {
    color: #6B7280;
    line-height: 1.6;
}

/* Tables */
.table {
    background: white;
    border-radius: 0.75rem;
    overflow: hidden;
}

.table thead {
    background: var(--light-bg);
}

.table th {
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #6B7280;
    border-bottom: 2px solid var(--border-color);
    padding: 0.875rem 1rem;
}

.table td {
    padding: 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--border-color);
}

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

.table-hover tbody tr:hover {
    background: var(--light-bg);
}

/* Buttons */
.btn {
    border-radius: 0.5rem;
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    transition: all 0.2s;
    border: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0,102,204,0.3);
}

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

.btn-success:hover {
    background: #059669;
}

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

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

.btn-outline-secondary {
    border: 1px solid var(--border-color);
    color: #6B7280;
}

.btn-outline-secondary:hover {
    background: var(--light-bg);
}

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

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

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

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

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.875rem;
}

/* Forms */
.form-label {
    font-weight: 500;
    color: var(--dark);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.form-control {
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.625rem 0.875rem;
    transition: all 0.2s;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,102,204,0.1);
}

.form-check-input:checked {
    background-color: var(--primary);
    border-color: var(--primary);
}

/* Badges */
.badge {
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
    font-weight: 500;
    font-size: 0.75rem;
}

.bg-success {
    background: var(--success) !important;
}

.bg-warning {
    background: var(--warning) !important;
}

.bg-danger {
    background: var(--danger) !important;
}

/* Alerts */
.alert {
    border-radius: 0.75rem;
    border: none;
    padding: 1rem 1.25rem;
}

.alert-success {
    background: #D1FAE5;
    color: #065F46;
}

.alert-danger {
    background: #FEE2E2;
    color: #991B1B;
}

.alert-warning {
    background: #FEF3C7;
    color: #92400E;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    margin: 0 0 0.35rem;
    background: none;
    box-shadow: none;
    border-radius: 0;
}

.breadcrumb-item {
    font-size: 0.8rem;
    color: #9CA3AF;
    display: flex;
    align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "›";
    padding: 0 0.4rem;
    color: #D1D5DB;
}

.breadcrumb-item a {
    color: #6B7280;
    text-decoration: none;
    transition: color 0.15s;
}

.breadcrumb-item a:hover {
    color: var(--primary);
    text-decoration: none;
}

.breadcrumb-item.active {
    color: var(--dark);
    font-weight: 500;
}

/* Text utilities */
.text-muted {
    color: #6B7280 !important;
}

/* Validation */
.valid.modified:not([type=checkbox]) {
    border-color: var(--success);
}

.invalid {
    border-color: var(--danger);
}

.validation-message {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Error boundary */
.blazor-error-boundary {
    background: var(--danger);
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
    border-radius: 0.5rem;
}

.blazor-error-boundary::after {
    content: "An error has occurred."
}

#blazor-error-ui {
    background: var(--danger);
    bottom: 0;
    box-shadow: 0 -1px 8px rgba(0, 0, 0, 0.2);
    display: none;
    left: 0;
    padding: 1rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
    color: white;
    border-radius: 0;
}

#blazor-error-ui .dismiss {
    cursor: pointer;
    position: absolute;
    right: 1rem;
    top: 0.5rem;
    font-size: 1.5rem;
}

/* Page header */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    margin-bottom: 0.25rem;
}

/* Code elements */
code {
    background: var(--light-bg);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-size: 0.875em;
    color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
    .app-sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }

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

    .sidebar-toggle:checked ~ .app-sidebar {
        transform: translateX(0);
    }
}