body {
            font-family: 'Sarabun', sans-serif;
            background-color: #f0f7f4;
        }

        .pastel-green {
            background-color: #e8f5e9;
        }

        .accent-green {
            background-color: #81c784;
        }

        .hover-green:hover {
            background-color: #66bb6a;
        }

        .hover-yellow:hover {
            background-color: #fff9c4;
        }

        .card {
            background: white;
            border-radius: 1rem;
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
        }

        .tab-active {
            border-bottom: 3px solid #4caf50;
            color: #2e7d32;
            font-weight: 600;
        }

        input,
        select,
        textarea {
            border: 1px solid #e0e0e0;
            transition: all 0.3s ease;
        }

        input:focus,
        select:focus,
        textarea:focus {
            outline: none;
            border-color: #81c784;
            box-shadow: 0 0 0 3px rgba(129, 199, 132, 0.2);
        }

        .loading-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(255, 255, 255, 0.8);
            z-index: 1000;
            justify-content: center;
            align-items: center;
            flex-direction: column;
        }