:root {
    /* Brand & Accent */
    --mf-primary: #0d6efd;
    --mf-primary-hover: #0b5ed7;
    --mf-primary-border-subtle: rgba(13, 110, 253, 0.25);

    /* Surfaces & Backgrounds */
    --mf-bg-page: #ffffff;
    --mf-bg-surface: #ffffff;
    --mf-bg-subtle: #f8f9fa;
    --mf-bg-muted: #e9ecef;

    /* Text & Hierarchy */
    --mf-text-primary: #212529;
    --mf-text-secondary: #495057;
    --mf-text-muted: #6c757d;

    /* Borders, Radius & Elevation */
    --mf-border-color: rgba(0, 0, 0, 0.08);
    --mf-border-subtle: #e9ecef;
    --mf-radius-sm: 0.375rem;
    --mf-radius-md: 0.5rem;
    --mf-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.05);
    --mf-shadow-hover: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.07);

    /* Transitions & Layout */
    --mf-transition-fast: 0.15s ease-in-out;
    --mf-navbar-height: 56px;
    --mf-control-min-height: 2.75rem;

    /* Semantic Feedback */
    --mf-danger: #dc3545;
}

.app-navbar {
    min-height: var(--mf-navbar-height);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.app-brand {
    min-height: var(--mf-navbar-height);
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #ffffff;
    transition: opacity var(--mf-transition-fast), transform var(--mf-transition-fast);
}

.app-brand:hover,
.app-brand:focus-visible {
    color: #ffffff;
}

.app-brand-icon {
    width: 1.875rem;
    height: 1.875rem;
    border-radius: var(--mf-radius-sm);
    background: linear-gradient(135deg, var(--mf-primary), var(--mf-primary-hover));
    color: #ffffff;
    box-shadow: 0 2px 6px rgba(13, 110, 253, 0.35);
    transition: transform var(--mf-transition-fast), box-shadow var(--mf-transition-fast);
}

.app-brand:hover .app-brand-icon {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(13, 110, 253, 0.5);
}

.app-brand-title {
    line-height: 1;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9);
}

.app-brand-accent {
    font-weight: 700;
    color: #ffffff;
}

.sidebar-container {
    min-height: calc(100vh - var(--mf-navbar-height));
    background-color: var(--mf-bg-subtle);
    border-right: 1px solid var(--mf-border-subtle);
}

.sidebar-sticky {
    top: var(--mf-navbar-height);
    min-height: calc(100vh - var(--mf-navbar-height));
    display: flex;
    flex-direction: column;
}

.sidebar-heading {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--mf-text-muted);
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--mf-radius-sm);
    font-size: 0.9375rem;
    transition: background-color var(--mf-transition-fast), color var(--mf-transition-fast), box-shadow var(--mf-transition-fast);
}

.sidebar-nav .nav-link:hover:not(.active) {
    background-color: var(--mf-bg-muted);
    color: var(--mf-text-primary) !important;
}

.sidebar-nav .nav-link.active {
    background-color: var(--mf-primary);
    color: var(--mf-bg-surface) !important;
    box-shadow: var(--mf-shadow-sm);
}

.sidebar-icon {
    flex-shrink: 0;
    opacity: 0.75;
    transition: opacity var(--mf-transition-fast);
}

.sidebar-nav .nav-link:hover .sidebar-icon,
.sidebar-nav .nav-link.active .sidebar-icon {
    opacity: 1;
}

.sidebar-user-avatar {
    width: 1.75rem;
    height: 1.75rem;
    border-radius: var(--mf-radius-sm);
    background-color: var(--mf-bg-surface);
    border: 1px solid var(--mf-border-subtle);
    color: var(--mf-text-secondary);
}

.auth-card {
    border: 1px solid var(--mf-border-color);
    border-radius: var(--mf-radius-md);
    background-color: var(--mf-bg-surface);
}

.auth-card .form-control,
.auth-card .btn {
    min-height: var(--mf-control-min-height);
}

.surface-card {
    border: 1px solid var(--mf-border-color);
    border-radius: var(--mf-radius-md);
    background-color: var(--mf-bg-surface);
}

.form-error {
    color: var(--mf-danger);
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: block;
}

.item-link {
    text-decoration: none;
    color: var(--mf-text-primary);
    font-weight: 600;
    line-height: 1.4;
    transition: color var(--mf-transition-fast);
}

.item-link:hover {
    color: var(--mf-primary);
}

.item-card {
    border: 1px solid var(--mf-border-color);
    border-radius: var(--mf-radius-md);
    background-color: var(--mf-bg-surface);
    transition: transform var(--mf-transition-fast), box-shadow var(--mf-transition-fast), border-color var(--mf-transition-fast);
}

.item-card:hover {
    border-color: var(--mf-primary-border-subtle);
    box-shadow: var(--mf-shadow-hover) !important;
}

.item-channel-logo-wrapper {
    width: 64px;
    height: 48px;
    border-radius: var(--mf-radius-sm);
    background-color: var(--mf-bg-subtle);
    border: 1px solid var(--mf-border-subtle);
    align-items: center;
    justify-content: center;
    padding: 0.25rem;
    overflow: hidden;
}

.item-channel-logo {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.item-channel-name {
    color: var(--mf-text-secondary);
    transition: color var(--mf-transition-fast);
}

.item-channel-name:hover {
    color: var(--mf-primary);
}

.item-category-badge {
    font-weight: 500;
    transition: background-color var(--mf-transition-fast), color var(--mf-transition-fast);
}

.item-category-badge:hover {
    background-color: var(--mf-bg-muted) !important;
    color: var(--mf-text-primary) !important;
}

.item-description {
    font-size: 0.95rem;
    line-height: 1.6;
}

.item-datepicker {
    width: 150px;
}

.min-width-0 {
    min-width: 0;
}