:root {
            --primary: #3b82f6;
            --primary-hover: #2563eb;
            --bg: #f0f4f8;
            --card-bg: #ffffff;
            --text-main: #1a202c;
            --text-muted: #475569;
            --border: #e2e8f0;
        }

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            display: flex;
            flex-direction: column;
            align-items: center;
            background-color: var(--bg);
            margin: 0;
            padding: 2rem 1rem;
            color: var(--text-main);
        }

        h2 {
            margin-top: 0;
            color: var(--text-main);
            font-weight: 700;
        }

        #simCanvas {
            background: linear-gradient(to bottom, #63a4ff 0%, #83eaf1 100%);
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
            margin-bottom: 24px;
            max-width: 100%;
            height: auto;
        }

        .control-panel {
            background: var(--card-bg);
            padding: 20px;
            border-radius: 20px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
            display: flex;
            flex-direction: column;
            gap: 16px;
            width: 100%;
            max-width: 940px;
            box-sizing: border-box;
        }

        #adminSection, .admin-only {
            display: none !important; /* Admin Authority Hidden by Default */
        }

        .admin-mode #adminSection {
            display: flex !important;
            animation: fadeIn 0.4s ease-out;
        }

        .admin-mode .admin-only {
            display: inline-block !important;
            animation: fadeIn 0.4s ease-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .control-section {
            background: #ffffff;
            border: 1px solid var(--border);
            padding: 16px;
            border-radius: 12px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .control-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
        }

        .section-title {
            font-weight: 800;
            color: var(--text-muted);
            font-size: 13px;
            text-transform: uppercase;
            letter-spacing: 0.1rem;
            margin-bottom: 4px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .slider-group {
            display: flex;
            align-items: center;
            gap: 10px;
            flex: 1 1 calc(50% - 10px);
            background: #f8fafc;
            padding: 8px 12px;
            border-radius: 10px;
            border: 1px solid var(--border);
            min-height: 40px;
            box-sizing: border-box;
        }

        input[type="range"] {
            accent-color: var(--primary);
            flex-grow: 1;
            cursor: ew-resize;
        }

        /* Fixed radius/hole selection layout */
        .hole-selector-group {
            padding-right: 8px;
        }

        .segmented-control {
            display: flex;
            background: #e2e8f0;
            padding: 3px;
            border-radius: 8px;
            flex-grow: 1;
            gap: 2px;
        }

        .hole-btn {
            flex: 1;
            padding: 6px 4px;
            font-size: 12px;
            border: none;
            background: transparent;
            color: var(--text-muted);
            cursor: pointer;
            border-radius: 6px;
            font-weight: 700;
            box-shadow: none;
            transition: all 0.2s;
        }

        .hole-btn.active {
            background: var(--primary);
            color: white;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }

        .hole-btn:hover:not(.active) {
            background: rgba(255,255,255,0.5);
        }

        button {
            padding: 10px 16px;
            font-size: 13px;
            cursor: pointer;
            border: none;
            border-radius: 8px;
            background-color: var(--primary);
            color: white;
            font-weight: 600;
            transition: all 0.2s ease;
        }

        .btn-secondary {
            background-color: #64748b;
        }

        button:hover {
            opacity: 0.9;
            transform: translateY(-1px);
        }

        .disabled-group {
            opacity: 0.5;
            pointer-events: none;
        }

        label {
            width: 90px;
            font-size: 13px;
            color: var(--text-muted);
            font-weight: 700;
            white-space: nowrap;
        }

        .val-display {
            min-width: 80px;
            text-align: right;
            color: var(--primary);
            font-family: 'JetBrains Mono', monospace;
            font-size: 13px;
        }

        @media (max-width: 850px) {
            .slider-group {
                flex: 1 1 100%;
            }
        }