/* ── Sidebar Layout ── */
:root {
    --sidebar-width: 250px;
    --sidebar-collapsed-width: 60px;
    --sidebar-bg: #1e293b;
    --sidebar-text: #cbd5e1;
    --sidebar-active: #3b82f6;
    --sidebar-hover: #334155;
    --sidebar-group-text: #64748b;
    --topbar-height: 56px;
    --transition-speed: 0.25s;
}

/* Top navbar */
.app-topbar {
    height: var(--topbar-height);
    background: #ffffff;
    border-bottom: 1px solid #dee2e6;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
    display: flex;
    align-items: center;
    padding: 0 1rem;
}

.app-topbar .navbar-brand {
    font-weight: 600;
    color: #1e293b;
    margin-right: 1rem;
}

.app-topbar .btn-sidebar-toggle {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: #475569;
    padding: 0.25rem 0.5rem;
    cursor: pointer;
    border-radius: 0.375rem;
}

.app-topbar .btn-sidebar-toggle:hover {
    background: #f1f5f9;
}

.app-topbar .user-section {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Sidebar */
.app-sidebar {
    position: fixed;
    top: var(--topbar-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    overflow-y: auto;
    overflow-x: hidden;
    transition: width var(--transition-speed) ease;
    z-index: 1020;
    scrollbar-width: thin;
    scrollbar-color: #475569 transparent;
}

.app-sidebar::-webkit-scrollbar {
    width: 4px;
}

.app-sidebar::-webkit-scrollbar-thumb {
    background: #475569;
    border-radius: 2px;
}

/* Collapsed state */
.sidebar-collapsed .app-sidebar {
    width: var(--sidebar-collapsed-width);
}

.sidebar-collapsed .app-sidebar .menu-text,
.sidebar-collapsed .app-sidebar .menu-group-title,
.sidebar-collapsed .app-sidebar .submenu-arrow {
    display: none;
}

.sidebar-collapsed .app-sidebar .menu-item > a {
    justify-content: center;
    padding: 0.65rem 0;
}

.sidebar-collapsed .app-sidebar .menu-item > a i {
    margin-right: 0;
    font-size: 1.2rem;
}

.sidebar-collapsed .app-sidebar .submenu {
    display: none !important;
}

/* Main content area */
.app-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--topbar-height);
    padding: 1.25rem;
    transition: margin-left var(--transition-speed) ease;
    min-height: calc(100vh - var(--topbar-height));
}

.sidebar-collapsed .app-content {
    margin-left: var(--sidebar-collapsed-width);
}

/* Menu items */
.menu-group-title {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--sidebar-group-text);
    padding: 1rem 1rem 0.35rem 1rem;
    white-space: nowrap;
    overflow: hidden;
}

.menu-item > a,
.menu-item > button {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.875rem;
    border-radius: 0.375rem;
    margin: 1px 0.5rem;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
    border: none;
    background: none;
    width: calc(100% - 1rem);
    cursor: pointer;
    text-align: left;
}

.menu-item > a:hover,
.menu-item > button:hover {
    background: var(--sidebar-hover);
    color: #f1f5f9;
}

.menu-item > a.active,
.menu-item > button.active {
    background: var(--sidebar-active);
    color: #ffffff;
}

.menu-item > a i,
.menu-item > button i {
    width: 1.25rem;
    text-align: center;
    margin-right: 0.65rem;
    font-size: 1rem;
    flex-shrink: 0;
}

.menu-text {
    overflow: hidden;
    text-overflow: ellipsis;
}

.submenu-arrow {
    margin-left: auto;
    font-size: 0.7rem;
    transition: transform 0.2s;
}

.menu-item.open > button .submenu-arrow {
    transform: rotate(90deg);
}

/* Submenu */
.submenu {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.menu-item.open > .submenu {
    max-height: 500px;
}

.submenu .menu-item > a {
    padding-left: 2.75rem;
    font-size: 0.825rem;
}

/* Footer area in sidebar */
.sidebar-footer {
    padding: 0.75rem 1rem;
    border-top: 1px solid #334155;
    font-size: 0.75rem;
    color: var(--sidebar-group-text);
}

/* Responsive */
@media (max-width: 991.98px) {
    .app-sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width) !important;
    }

    .sidebar-mobile-open .app-sidebar {
        transform: translateX(0);
    }

    .app-content {
        margin-left: 0 !important;
    }

    /* Overlay behind sidebar on mobile */
    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.4);
        z-index: 1015;
    }

    .sidebar-mobile-open .sidebar-overlay {
        display: block;
    }
}

/* ── General improvements ── */
html {
    font-size: 14px;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

body {
    margin: 0;
    padding: 0;
    background: #f8fafc;
}

/* Status badges */
.badge-active { background-color: #22c55e; color: white; }
.badge-inactive { background-color: #94a3b8; color: white; }
.badge-blocked { background-color: #ef4444; color: white; }

/* Table improvements */
.table-admin th {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: #64748b;
    font-weight: 600;
    border-bottom: 2px solid #e2e8f0;
}

.table-admin td {
    vertical-align: middle;
    font-size: 0.875rem;
}

/* Card panels */
.admin-card {
    background: white;
    border-radius: 0.5rem;
    border: 1px solid #e2e8f0;
    padding: 1.25rem;
    margin-bottom: 1rem;
}

/* Pagination */
.pagination-sm .page-link {
    font-size: 0.8rem;
    padding: 0.25rem 0.6rem;
}

/* App footer */
.app-footer {
    padding: 1rem;
    text-align: center;
    font-size: 0.8rem;
    color: #94a3b8;
    border-top: 1px solid #e2e8f0;
    margin-top: 2rem;
}