/* ========== Base Styles ========== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: "Open Sans", "Microsoft JhengHei", "微軟正黑體", sans-serif;
            background-color: #EF5100;
            color: #222222;
            min-height: 100vh;
        }

        /* ========== Decorative Elements ========== */
        .decorative-circles {
            position: fixed;
            top: -100px;
            right: -100px;
            width: 400px;
            height: 400px;
            pointer-events: none;
            overflow: visible;
            z-index: 1;
            animation: float 20s ease-in-out infinite;
        }

        @keyframes float {
            0%, 100% { transform: translate(0, 0) rotate(0deg); }
            25% { transform: translate(-30px, 30px) rotate(90deg); }
            50% { transform: translate(-50px, 0) rotate(180deg); }
            75% { transform: translate(-30px, -30px) rotate(270deg); }
        }

        .circle {
            position: absolute;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.3);
            animation: pulse 4s ease-in-out infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 0.3; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(1.05); }
        }

        .circle-1 { width: 400px; height: 400px; top: 0; right: 0; animation-delay: 0s; }
        .circle-2 { width: 320px; height: 320px; top: 40px; right: 40px; animation-delay: 0.5s; }
        .circle-3 { width: 240px; height: 240px; top: 80px; right: 80px; animation-delay: 1s; }

        /* ========== Layout Components ========== */
        .header {
            background-color: transparent;
            padding: 20px 40px;
            display: flex;
            justify-content: space-between;
            align-items: space-between;
            position: relative;
            z-index: 2;
        }

        .logo img {
            height: 40px;
            width: auto;
        }

        .nav-buttons {
            display: flex;
            gap: 15px;
        }

        .nav-btn {
            padding: 10px 20px;
            border-radius: 25px;
            font-size: 14px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s;
            border: 2px solid #FFFFFF;
            background-color: transparent;
            color: #FFFFFF;
        }

        .nav-btn:hover {
            background-color: #FFFFFF;
            color: #EF5100;
            transform: translateY(-2px);
        }

        .main-container {
            background-color: #FFFFFF;
            margin: 20px auto;
            border-radius: 20px;
            padding: 60px 40px;
            max-width: 900px;
            min-height: calc(100vh - 140px);
            position: relative;
            z-index: 2;
        }

        /* ========== Contact Section ========== */
        .contact-section {
            text-align: center;
            margin-bottom: 30px;
        }

        .page-title {
            font-size: 40px;
            font-weight: 700;
            color: #222222;
            margin-bottom: 30px;
        }

        .contact-description {
            font-size: 16px;
            color: #555555;
            line-height: 1.8;
            margin-bottom: 10px;
            font-weight: 600;
        }

        .contact-link {
            color: #EF5100;
            text-decoration: none;
            font-weight: 600;
            transition: 0.3s;
        }

        .contact-link:hover {
            color: #EF5100;
            opacity: 0.7;
        }

        .icon-link {
            font-size: 11px;
            margin-left: 2px;
            color: #EF5100;
        }

        .contact-link:hover ~ .icon-link {
            color: #EF5100;
        }

        /* ========== Form Container ========== */
        .form-container {
            background-color: #FFFFFF;
            border: 1px solid #E0E0E0;
            border-radius: 12px;
            padding: 40px;
            max-width: 700px;
            margin: 0 auto;
        }

        /* ========== Form Groups ========== */
        .form-group {
            margin-bottom: 25px;
        }

        .form-row {
            display: flex;
            gap: 20px;
            margin-bottom: 25px;
        }

        .form-row .form-group {
            flex: 1;
            margin-bottom: 0;
        }

        .form-row-phone {
            display: flex;
            gap: 15px;
            align-items: flex-start;
        }

        .phone-group {
            flex: 2;
        }

        .ext-group {
            flex: 1;
        }

        .form-label {
            font-size: 16px;
            font-weight: 700;
            color: #222222;
            margin-bottom: 8px;
            display: block;
        }

        .required {
            color: #EF5100;
            margin-left: 2px;
        }

        /* ========== Form Controls ========== */
        .form-input,
        .form-select,
        .form-textarea {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid #E0E0E0;
            border-radius: 8px;
            font-size: 16px;
            font-family: inherit;
            transition: all 0.3s;
            background-color: #FFFFFF;
        }

        .form-select {
            cursor: pointer;
            appearance: none;
            background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23222222' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
            background-repeat: no-repeat;
            background-position: right 12px center;
            background-size: 20px;
            padding-right: 40px;
        }

        .form-textarea {
            min-height: 150px;
            resize: vertical;
        }

        .form-input:focus,
        .form-select:focus,
        .form-textarea:focus {
            outline: none;
            border-color: #EF5100;
            background-color: #FFF5F0;
        }

        .form-input.error,
        .form-select.error,
        .form-textarea.error {
            border-color: #DC3545;
            background-color: #FFEBEE;
        }

        /* ========== Error Messages ========== */
        .error-msg {
            color: #DC3545;
            font-size: 12px;
            margin-top: 5px;
            display: none;
        }

        /* ========== Button Group ========== */
        .button-group {
            display: flex;
            gap: 15px;
            justify-content: center;
            margin-top: 35px;
        }

        .btn {
            padding: 15px 40px;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s;
            border: none;
            min-width: 120px;
        }

        .btn-back {
            background-color: #FFFFFF;
            color: #EF5100;
            border: 2px solid #EF5100;
        }

        .btn-back:hover {
            background-color: #FFF5F0;
            transform: translateY(-2px);
        }

        .btn-submit {
            background-color: #EF5100;
            color: #FFFFFF;
        }

        .btn-submit:hover:not(:disabled) {
            background-color: #D44400;
            transform: translateY(-2px);
        }

        .btn-submit:disabled {
            background-color: #CCCCCC;
            cursor: not-allowed;
        }

        /* Mobile button order */
        @media (max-width: 480px) {
            .button-group {
                flex-direction: column-reverse;
            }
        }

        /* ========== Modal Overlay ========== */
        .modal-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            justify-content: center;
            align-items: center;
        }

        .modal-overlay.active {
            display: flex;
        }

        .modal-content {
            background-color: #FFFFFF;
            border-radius: 12px;
            padding: 40px 60px;
            max-width: 500px;
            text-align: center;
            position: relative;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        }

        .modal-close {
            position: absolute;
            top: 15px;
            right: 15px;
            font-size: 24px;
            color: #999;
            cursor: pointer;
            transition: color 0.3s;
            background: none;
            border: none;
        }

        .modal-close:hover {
            color: #333;
        }

        .modal-icon {
            font-size: 48px;
            margin-bottom: 20px;
            color: #EF5100;
        }

        .modal-title {
            font-size: 24px;
            font-weight: 700;
            color: #222222;
            margin-bottom: 30px;
        }

        .modal-message {
            font-size: 16px;
            color: #555555;
            line-height: 1.6;
            margin-bottom: 10px;
        }

        .modal-highlight {
            color: #EF5100;
            font-weight: 700;
        }

        .modal-btn {
            padding: 12px 40px;
            background-color: #EF5100;
            color: #FFFFFF;
            border: none;
            border-radius: 25px;
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 30px;
        }

        .modal-btn:hover {
            background-color: #D44400;
        }

        /* ========== Loading State ========== */
        .loading-spinner {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid #FFFFFF;
            border-radius: 50%;
            border-top-color: transparent;
            animation: spin 0.8s linear infinite;
            margin-left: 8px;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* ========== Responsive Design ========== */
        @media (max-width: 768px) {
            .main-container {
                margin: 10px;
                padding: 40px 20px;
            }
            
            .page-title { 
                font-size: 32px; 
            }
            
            .form-container { 
                padding: 30px 20px; 
            }
            
            .form-row {
                flex-direction: column;
            }
            
            .button-group {
                flex-direction: column-reverse;
            }
            
            .btn {
                width: 100%;
            }
        }

        @media (max-width: 480px) {
            .header { 
                padding: 15px 20px;
                flex-direction: column;
                gap: 15px;
            }
            
            .nav-buttons {
                width: 100%;
                justify-content: center;
            }
            
            .page-title { 
                font-size: 28px; 
            }
            
            .contact-description {
                font-size: 14px;
            }
            
            .decorative-circles { 
                right: -50px; 
                top: -50px; 
                width: 300px; 
                height: 300px; 
            }
            
            .circle-1 { width: 300px; height: 300px; }
            .circle-2 { width: 240px; height: 240px; top: 30px; right: 30px; }
            .circle-3 { width: 180px; height: 180px; top: 60px; right: 60px; }
            
            .modal-content {
                margin: 20px;
                padding: 30px 20px;
            }
            .modal-message {
                font-size: 14px;
            }
        }