/* ----- reset & base ----- */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: #eef2f7;
            color: #0b1a2f;
            line-height: 1.5;
            padding: 0 0 3rem 0;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            background-image:
                radial-gradient(ellipse at 10% 20%, rgba(37, 99, 235, 0.06) 0%, transparent 55%),
                radial-gradient(ellipse at 90% 80%, rgba(37, 99, 235, 0.05) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 50%, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
            background-attachment: fixed;
        }

        /* ----- banner ----- */
        .banner {
            width: 100%;
            background: #0b1a2f;
            display: flex;
            justify-content: center;
            align-items: center;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.20);
            position: relative;
            z-index: 2;
        }

        .banner img {
            width: 100%;
            max-width: 1200px;
            height: auto;
            display: block;
            object-fit: contain;
            background: #0b1a2f;
        }

        /* ----- container ----- */
        .container {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 1.5rem;
            position: relative;
            z-index: 1;
            flex: 1;
        }

        /* ----- header text (more refined) ----- */
        .event-header {
            text-align: center;
            margin: 2.8rem 0 2rem 0;
        }

        .event-header h1 {
            font-size: 2.4rem;
            font-weight: 700;
            letter-spacing: -0.03em;
            color: #0b1a2f;
            background: rgba(255, 255, 255, 0.65);
            display: inline-block;
            padding: 0.3rem 2.4rem;
            border-radius: 60px;
            backdrop-filter: blur(8px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.5);
        }

        .event-header .sub {
            font-size: 1.05rem;
            color: #1e3a5f;
            margin-top: 0.6rem;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.55);
            display: inline-block;
            padding: 0.4rem 2rem;
            border-radius: 40px;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.3);
        }

        .event-header .date-venue {
            font-size: 0.95rem;
            color: #1e3a5f;
            margin-top: 0.5rem;
            background: rgba(255, 255, 255, 0.5);
            padding: 0.4rem 2rem;
            border-radius: 40px;
            display: inline-block;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.25);
            font-weight: 500;
        }

        .expo-names {
            font-size: 0.95rem;
            font-weight: 600;
            color: #0b1a2f;
            margin-top: 0.7rem;
            background: rgba(255, 255, 255, 0.75);
            padding: 0.5rem 2rem;
            border-radius: 40px;
            display: inline-block;
            backdrop-filter: blur(4px);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.3);
            line-height: 1.6;
        }
        .expo-names .separator {
            display: inline-block;
            margin: 0 0.4rem;
            color: #64748b;
            font-weight: 300;
        }
        @media (max-width: 600px) {
            .expo-names .separator {
                display: none;
            }
            .expo-names br {
                display: block;
            }
        }
        @media (min-width: 601px) {
            .expo-names br {
                display: none;
            }
        }

        /* ----- form card (heavily beautified) ----- */
        .form-card {
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(12px);
            border-radius: 36px;
            box-shadow:
                0 24px 64px rgba(0, 0, 0, 0.08),
                0 8px 24px rgba(0, 0, 0, 0.04),
                inset 0 1px 0 rgba(255, 255, 255, 0.6);
            padding: 2.8rem 3rem 3rem 3rem;
            margin-top: 0.5rem;
            border: 1px solid rgba(255, 255, 255, 0.7);
            transition: box-shadow 0.4s ease;
            position: relative;
            overflow: hidden;
            min-height: 450px;
        }

        .form-card:hover {
            box-shadow:
                0 32px 80px rgba(0, 0, 0, 0.10),
                0 8px 28px rgba(0, 0, 0, 0.05);
        }

        /* decorative blobs */
        .form-card::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.05) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .form-card::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -20%;
            width: 350px;
            height: 350px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.04) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        /* ----- form elements ----- */
        .form-group {
            margin-bottom: 1.5rem;
            position: relative;
            z-index: 1;
        }

        .form-group label {
            display: block;
            font-weight: 600;
            font-size: 0.9rem;
            color: #1a3352;
            margin-bottom: 0.4rem;
            letter-spacing: -0.01em;
        }

        .form-group label .required {
            color: #dc2626;
            margin-left: 2px;
            font-weight: 700;
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 0.8rem 1.2rem;
            font-size: 0.95rem;
            font-family: 'Inter', sans-serif;
            border: 1.5px solid rgba(203, 213, 225, 0.6);
            border-radius: 18px;
            background: rgba(255, 255, 255, 0.75);
            backdrop-filter: blur(2px);
            transition: border-color 0.25s, box-shadow 0.25s, background 0.25s, transform 0.15s;
            color: #0b1a2f;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
        }

        .form-group input:hover,
        .form-group select:hover,
        .form-group textarea:hover {
            background: rgba(255, 255, 255, 0.92);
            border-color: rgba(148, 163, 184, 0.7);
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: #2563eb;
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.10), inset 0 1px 3px rgba(0, 0, 0, 0.02);
            background: #ffffff;
            transform: translateY(-1px);
        }

        .form-group input::placeholder,
        .form-group textarea::placeholder {
            color: #94a3b8;
            font-weight: 400;
            font-size: 0.9rem;
        }

        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }

        /* ----- two-column row (Full Name + Job Title, Phone + Email) ----- */
        .form-row-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.2rem 1.5rem;
        }

        .form-row-2 .form-group {
            margin-bottom: 0;
        }

        /* ----- radio group (modern) ----- */
        .radio-group {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem 2.5rem;
            padding-top: 0.2rem;
        }

        .radio-group label {
            display: flex;
            align-items: center;
            gap: 0.7rem;
            font-weight: 500;
            font-size: 0.95rem;
            color: #1a3352;
            cursor: pointer;
            padding: 0.4rem 1.2rem 0.4rem 0.9rem;
            border-radius: 40px;
            transition: background 0.2s, transform 0.12s, box-shadow 0.2s;
            background: rgba(255, 255, 255, 0.4);
            border: 1.5px solid transparent;
            user-select: none;
        }

        .radio-group label:hover {
            background: rgba(255, 255, 255, 0.8);
            border-color: rgba(37, 99, 235, 0.20);
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
        }

        .radio-group label:has(input:checked) {
            background: rgba(37, 99, 235, 0.08);
            border-color: #2563eb;
            box-shadow: 0 4px 16px rgba(37, 99, 235, 0.08);
        }

        .radio-group input[type="radio"] {
            width: 1.2rem;
            height: 1.2rem;
            accent-color: #2563eb;
            margin: 0;
            flex-shrink: 0;
            cursor: pointer;
        }

        /* ----- select custom (chevron) ----- */
        select {
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='10' viewBox='0 0 14 10'%3E%3Cpath d='M1 2l6 6 6-6' stroke='%23334e68' stroke-width='1.8' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 1.2rem center;
            background-size: 14px 10px;
            padding-right: 2.8rem;
            cursor: pointer;
        }

        select:invalid {
            color: #94a3b8;
        }
        select option {
            color: #0b1a2f;
        }

        /* ----- submit button (premium) ----- */
        .btn-submit {
            width: 100%;
            padding: 1.1rem 1.5rem;
            background: linear-gradient(145deg, #0b1a2f 0%, #1a3352 100%);
            color: #ffffff;
            font-weight: 600;
            font-size: 1.1rem;
            border: none;
            border-radius: 60px;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            letter-spacing: 0.02em;
            margin-top: 0.6rem;
            box-shadow: 0 8px 28px rgba(11, 26, 47, 0.30);
            position: relative;
            overflow: hidden;
        }

        .btn-submit::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.12) 0%, transparent 50%);
            pointer-events: none;
            border-radius: 60px;
        }

        .btn-submit::after {
            content: '';
            position: absolute;
            top: -60%;
            left: -60%;
            width: 220%;
            height: 220%;
            background: radial-gradient(circle at 30% 40%, rgba(255, 255, 255, 0.08) 0%, transparent 60%);
            opacity: 0;
            transition: opacity 0.6s;
            pointer-events: none;
        }

        .btn-submit:hover::after {
            opacity: 1;
        }

        .btn-submit:hover {
            transform: translateY(-3px) scale(1.01);
            box-shadow: 0 14px 40px rgba(11, 26, 47, 0.40);
        }

        .btn-submit:active {
            transform: scale(0.97) translateY(0);
            box-shadow: 0 4px 16px rgba(11, 26, 47, 0.25);
        }

        .btn-submit:disabled {
            opacity: 0.7;
            cursor: not-allowed;
            transform: none !important;
            box-shadow: 0 4px 16px rgba(11, 26, 47, 0.15);
        }

        /* ----- success / error messages ----- */
        .form-message {
            margin-top: 1.8rem;
            padding: 1rem 1.8rem;
            border-radius: 24px;
            font-weight: 500;
            display: none;
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.5);
            position: relative;
            z-index: 2;
            animation: fadeSlideIn 0.4s ease;
        }

        @keyframes fadeSlideIn {
            0% {
                opacity: 0;
                transform: translateY(12px);
            }
            100% {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .form-message.success {
            display: block;
            background: rgba(220, 252, 231, 0.92);
            border-color: #86efac;
            color: #14532d;
            box-shadow: 0 4px 20px rgba(0, 80, 0, 0.06);
        }

        .form-message.error {
            display: block;
            background: rgba(254, 226, 226, 0.92);
            border-color: #fca5a5;
            color: #7f1d1d;
            box-shadow: 0 4px 20px rgba(128, 0, 0, 0.06);
        }

        .form-hidden {
            display: none !important;
        }

        /* ----- Thank You Card (Success State) ----- */
        .thank-you-card {
            display: none;
            text-align: center;
            padding: 2rem 1rem 1rem 1rem;
            position: relative;
            z-index: 2;
            animation: fadeSlideIn 0.6s ease;
        }

        .thank-you-card .icon {
            font-size: 4rem;
            margin-bottom: 0.5rem;
        }

        .thank-you-card h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #0b1a2f;
            margin-bottom: 0.8rem;
        }

        .thank-you-card p {
            font-size: 1rem;
            color: #1e3a5f;
            max-width: 500px;
            margin: 0 auto 1.5rem auto;
            line-height: 1.6;
        }

        .thank-you-actions {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
            margin: 1.5rem 0 1rem 0;
        }

        .btn-primary, .btn-secondary, .btn-outline {
            padding: 0.8rem 2rem;
            border-radius: 60px;
            font-weight: 600;
            font-size: 0.95rem;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            font-family: 'Inter', sans-serif;
        }

        .btn-primary {
            background: #0b1a2f;
            color: white;
            box-shadow: 0 4px 14px rgba(11, 26, 47, 0.25);
        }
        .btn-primary:hover {
            background: #1a3352;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(11, 26, 47, 0.30);
        }

        .btn-secondary {
            background: #e2e8f0;
            color: #0b1a2f;
        }
        .btn-secondary:hover {
            background: #cbd5e1;
            transform: translateY(-2px);
        }

        .btn-outline {
            background: transparent;
            color: #1e3a5f;
            border: 1.5px solid #cbd5e1;
        }
        .btn-outline:hover {
            background: #f1f5f9;
            border-color: #94a3b8;
            transform: translateY(-2px);
        }

        .thank-you-reminder {
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px dashed rgba(148, 163, 184, 0.4);
            font-size: 0.9rem;
            color: #334155;
        }
        .thank-you-reminder strong {
            color: #0b1a2f;
        }
        .social-links {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            margin-top: 1rem;
        }

        .social-links a {
            color: #475569;
            text-decoration: none;
            font-weight: 500;
            font-size: 0.9rem;
            transition: color 0.2s;
        }
        .social-links a:hover {
            color: #0b1a2f;
        }

        /* ----- footer ----- */
        .form-footer {
            text-align: center;
            font-size: 0.82rem;
            color: #1e3a5f;
            margin-top: 2rem;
            padding: 0.8rem 1.4rem;
            border-radius: 40px;
            background: rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            position: relative;
            z-index: 1;
        }

        .form-footer a {
            color: #1a4f8a;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s;
        }

        .form-footer a:hover {
            color: #2563eb;
            text-decoration: underline;
        }

        /* ----- responsive ----- */
        @media (max-width: 768px) {
            .container {
                padding: 0 1rem;
            }

            .form-card {
                padding: 1.8rem 1.2rem 2.2rem 1.2rem;
                border-radius: 28px;
                min-height: auto;
            }

            .form-row-2 {
                grid-template-columns: 1fr;
                gap: 0;
            }

            .form-row-2 .form-group {
                margin-bottom: 1.5rem;
            }
            .form-row-2 .form-group:last-child {
                margin-bottom: 0;
            }

            .event-header h1 {
                font-size: 1.7rem;
                padding: 0.2rem 1.2rem;
            }

            .event-header .sub {
                font-size: 0.9rem;
                padding: 0.3rem 1.2rem;
            }

            .event-header .date-venue {
                font-size: 0.85rem;
                padding: 0.3rem 1.2rem;
            }

            .expo-names {
                font-size: 0.85rem;
                padding: 0.4rem 1.2rem;
                line-height: 1.5;
            }

            .radio-group {
                gap: 0.6rem 1.2rem;
            }
            .radio-group label {
                font-size: 0.9rem;
                padding: 0.3rem 0.9rem 0.3rem 0.7rem;
            }

            .btn-submit {
                font-size: 1rem;
                padding: 0.9rem 1rem;
            }

            .thank-you-card h2 {
                font-size: 1.6rem;
            }
            .thank-you-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn-primary, .btn-secondary, .btn-outline {
                width: 100%;
                justify-content: center;
            }
        }

        @media (max-width: 420px) {
            .form-card {
                padding: 1.2rem 0.8rem 1.8rem 0.8rem;
                border-radius: 24px;
            }

            .event-header h1 {
                font-size: 1.4rem;
                padding: 0.15rem 1rem;
            }

            .radio-group {

                flex-direction: column;
                gap: 0.4rem;
            }
            .radio-group label {
                padding: 0.25rem 0.8rem 0.25rem 0.6rem;
            }
        }