:root {
    --primary: #0d6efd;
    --primary-soft: #eaf2ff;
    --success: #198754;
    --warning: #ffc107;
    --danger: #dc3545;
    --info: #0dcaf0;
    --dark: #111827;
    --muted: #6c757d;
    --card: #ffffff;
}

body {
    font-family: "Segoe UI", sans-serif;
    background: linear-gradient(180deg, #f4f7fb 0%, #eef5ff 100%);
}

.app-shell {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: #101827;
    color: #fff;
    padding: 1.25rem 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 2rem;
    padding: 0.5rem 0.75rem;
}

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    padding: 0.75rem 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.7rem;
    transition: 0.2s ease;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background: rgba(255, 255, 255, 0.08);
    color: white;
}

.main-content {
    flex: 1;
    padding: 1.5rem 1rem 2rem;
}

.topbar {
    background: rgba(255,255,255,0.75);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(17,24,39,0.05);
    border-radius: 18px;
    padding: 1rem 1.2rem;
    margin-bottom: 1.25rem;
}

.stat-card {
    border-radius: 20px;
    background: linear-gradient(135deg, #ffffff, #f8fbff);
}

.icon-badge {
    width: 68px;
    height: 68px;
    border-radius: 18px;
    background: linear-gradient(135deg, #dfeeff, #ffffff);
    color: var(--primary);
    display: grid;
    place-items: center;
    font-size: 2rem;
}

.auth-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #e9f1ff, #f7fafc);
    padding: 20px;
}

.auth-card {
    width: min(100%, 480px);
    border-radius: 22px;
}

.card {
    border-radius: 20px;
}

.table td, .table th {
    vertical-align: middle;
}

@media (max-width: 991.98px) {
    .app-shell {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }

    .main-content {
        padding-top: 1rem;
    }
}