:root {
    --primary-color: #ef4444;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f1f5f9;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-xl: 0 10px 25px rgba(0,0,0,0.1);
    --panel-bg: #ffffff;
}

/*
 * Prevent permission flicker: keep guarded navigation/actions hidden until
 * auth-guard marks the page as ready.
 */
html:not(.auth-guard-ready) .sidebar-nav .nav-item,
html:not(.auth-guard-ready) [data-secure-action] {
    visibility: hidden;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
}

.index-body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: var(--primary-color);
    color: white;
    flex-direction: column;
}

        /* Essential Global Buttons & Forms fallback */
        .btn { padding: 10px 16px; border: none; border-radius: 8px; font-weight: 600; cursor: pointer; transition: all 0.2s; display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
        .btn-primary { background: var(--primary-color); color: white; }
        .btn-primary:hover { background: #dc2626; }
        .btn-secondary { background: var(--border-color); color: var(--text-main); }
        .btn-secondary:hover { background: #cbd5e1; }
        .btn-danger { background: var(--danger-color); color: white; }
        .btn-success { background: var(--success-color); color: white; }

        .form-group { display: flex; flex-direction: column; margin-bottom: 15px; }
        .form-group label { margin-bottom: 5px; font-weight: 600; font-size: 0.9rem; color: var(--text-main); }
        .form-control { padding: 10px 12px; border: 1px solid var(--border-color); border-radius: 8px; font-size: 1rem; outline: none; transition: border-color 0.2s; width: 100%; box-sizing: border-box; }
        .form-control:focus { border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);  }

        .loader {
            border: 4px solid rgba(255, 255, 255, 0.3);
            border-top: 4px solid white;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin-bottom: 20px;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }