body {
            font-family: 'Inter', sans-serif;
            background-color: #f4f6f9;
            color: #333333;
        }

        .dumas-card {
            background: #ffffff;
            border-radius: 16px;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            border: 1px solid #eaeaea;
            max-width: 680px;
            margin: 40px auto;
            padding: 0;
            overflow: hidden;
        }

        .nav-tabs {
            border-bottom: 1px solid #eaeaea;
            background-color: #ffffff;
            padding: 12px 24px 0 24px;
        }

        .nav-tabs .nav-link {
            border: none;
            color: #6b7280;
            font-weight: 500;
            font-size: 0.9rem;
            padding: 12px 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            border-bottom: 2px solid transparent;
        }

        .nav-tabs .nav-link.active {
            color: #d9534f;
            border-bottom: 2px solid #d9534f;
            background: transparent;
            font-weight: 600;
        }

        .card-body-custom { padding: 28px 32px 32px 32px; }

        .dumas-header {
            display: flex;
            align-items: center;
            gap: 16px;
            padding-bottom: 20px;
            margin-bottom: 24px;
        }

        .icon-box {
            width: 48px;
            height: 48px;
            background-color: #fff3eb;
            color: #e65100;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            flex-shrink: 0;
        }

        .title-badge { display: inline-flex; align-items: center; gap: 8px; }
        .title-badge h5 { margin: 0; font-weight: 700; color: #1f2937; font-size: 1.1rem; }

        .badge-dumas {
            background-color: #fde8e4;
            color: #d9534f;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 12px;
        }

        .subtitle { margin: 2px 0 0 0; color: #71717a; font-size: 0.85rem; }
        .form-label { font-size: 0.85rem; font-weight: 600; color: #374151; margin-bottom: 6px; }
        .required-star { color: #e53e3e; }

        .form-control {
            border-radius: 8px;
            border: 1px solid #d1d5db;
            padding: 9px 12px;
            font-size: 0.9rem;
            color: #111827;
        }

        .form-control:focus {
            border-color: #d9534f;
            box-shadow: 0 0 0 3px rgba(217, 83, 79, 0.15);
        }

        .char-counter { font-size: 0.78rem; color: #9ca3af; text-align: right; margin-top: 6px; }

        .btn-submit {
            background-color: #d9534f;
            color: #ffffff;
            border: none;
            border-radius: 8px;
            padding: 10px 22px;
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: background-color 0.2s ease;
        }

        .btn-submit:hover { background-color: #c9302c; color: #ffffff; }
        .footer-note { font-size: 0.82rem; color: #e53e3e; margin: 0; }