:root {
    --sa-primary: #4f46e5;
    --sa-primary-dark: #4338ca;
    --sa-primary-light: #e0e7ff;
    --sa-sidebar-bg: #1e1b4b;
    --sa-sidebar-width: 250px;
    --sa-sidebar-collapsed-width: 70px;
    --sa-body-bg: #f1f5f9;
    --sa-card-bg: #ffffff;
    --sa-text-muted: #64748b;
    --sa-border: #e2e8f0;
    --sa-radius: 0.625rem;
    --sa-shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
    --sa-shadow-lg: 0 10px 25px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
    --sa-transition: .2s ease all;
}

html {
    font-size: 15px;
    position: relative;
    min-height: 100%;
}

body {
    margin: 0;
    background-color: var(--sa-body-bg);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* ===== Layout shell ===== */
.sa-layout {
    display: flex;
    min-height: 100vh;
}

/* ===== Sidebar ===== */
.sa-sidebar {
    width: var(--sa-sidebar-width);
    background: var(--sa-sidebar-bg);
    color: #c7d2fe;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 1040;
    display: flex;
    flex-direction: column;
    transition: var(--sa-transition);
}

.sa-sidebar-brand {
    padding: 1.25rem 1.5rem;
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
    display: flex;
    align-items: center;
    gap: .6rem;
    white-space: nowrap;
    overflow: hidden;
}

.sa-sidebar-brand i {
    font-size: 1.5rem;
    color: var(--sa-primary);
}

.sa-sidebar-nav {
    flex: 1;
    padding: .5rem .75rem;
    overflow-y: auto;
}

.sa-sidebar-nav .nav-link {
    color: #c7d2fe;
    border-radius: var(--sa-radius);
    padding: .65rem .9rem;
    margin-bottom: .2rem;
    display: flex;
    align-items: center;
    gap: .7rem;
    font-size: .9rem;
    transition: var(--sa-transition);
}

.sa-sidebar-nav .nav-link:hover {
    background: rgba(255,255,255,.08);
    color: #fff;
}

.sa-sidebar-nav .nav-link.active {
    background: var(--sa-primary);
    color: #fff;
}

.sa-sidebar-nav .nav-link i {
    font-size: 1.15rem;
    flex-shrink: 0;
}

.sa-sidebar-section {
    font-size: .7rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: #818cf8;
    padding: 1rem .9rem .4rem;
    font-weight: 600;
}

/* ===== Main area ===== */
.sa-main {
    flex: 1;
    margin-left: var(--sa-sidebar-width);
    display: flex;
    flex-direction: column;
    min-width: 0;
    transition: var(--sa-transition);
}

/* ===== Topbar ===== */
.sa-topbar {
    background: var(--sa-card-bg);
    box-shadow: var(--sa-shadow);
    padding: .65rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 1030;
}

.sa-topbar-toggle {
    background: none;
    border: none;
    font-size: 1.3rem;
    color: var(--sa-text-muted);
    cursor: pointer;
    padding: .25rem .5rem;
    border-radius: var(--sa-radius);
    transition: var(--sa-transition);
}

.sa-topbar-toggle:hover {
    background: var(--sa-primary-light);
    color: var(--sa-primary);
}

.sa-topbar-user {
    display: flex;
    align-items: center;
    gap: .75rem;
}

.sa-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--sa-primary), #7c3aed);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: .85rem;
    flex-shrink: 0;
}

.sa-user-info {
    line-height: 1.2;
}

.sa-user-name {
    font-size: .85rem;
    font-weight: 600;
    color: #1e293b;
}

.sa-user-tenant {
    font-size: .75rem;
    color: var(--sa-text-muted);
}

/* ===== Content ===== */
.sa-content {
    padding: 1.5rem;
    flex: 1;
}

/* ===== Cards ===== */
.sa-card {
    background: var(--sa-card-bg);
    border: 1px solid var(--sa-border);
    border-radius: var(--sa-radius);
    box-shadow: var(--sa-shadow);
    transition: var(--sa-transition);
}

.sa-card:hover {
    box-shadow: var(--sa-shadow-lg);
}

.sa-stat-card {
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sa-stat-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--sa-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.sa-stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: #1e293b;
    line-height: 1;
}

.sa-stat-label {
    font-size: .8rem;
    color: var(--sa-text-muted);
    margin-top: .2rem;
}

/* ===== Sidebar collapsed ===== */
.sa-layout.collapsed .sa-sidebar {
    width: var(--sa-sidebar-collapsed-width);
}

.sa-layout.collapsed .sa-sidebar-brand span,
.sa-layout.collapsed .sa-sidebar-nav .nav-link span,
.sa-layout.collapsed .sa-sidebar-section {
    display: none;
}

.sa-layout.collapsed .sa-sidebar-brand {
    justify-content: center;
}

.sa-layout.collapsed .sa-sidebar-nav .nav-link {
    justify-content: center;
}

.sa-layout.collapsed .sa-main {
    margin-left: var(--sa-sidebar-collapsed-width);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .sa-sidebar {
        transform: translateX(-100%);
    }
    .sa-layout.mobile-open .sa-sidebar {
        transform: translateX(0);
    }
    .sa-main {
        margin-left: 0;
    }
    .sa-layout.collapsed .sa-main {
        margin-left: 0;
    }
}

/* ===== Bootstrap overrides ===== */
.btn-primary {
    background: var(--sa-primary);
    border-color: var(--sa-primary);
}
.btn-primary:hover {
    background: var(--sa-primary-dark);
    border-color: var(--sa-primary-dark);
}
.btn:focus, .btn:active:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 .2rem rgba(79,70,229,.2);
}