:root {
        --primary-blue: #2563eb;
        --primary-blue-dark: #1d4ed8;
        --primary-green: #10b981;
        --primary-green-dark: #059669;
        --gray-50: #f9fafb;
        --gray-100: #f3f4f6;
        --gray-200: #e5e7eb;
        --gray-300: #d1d5db;
        --gray-400: #9ca3af;
        --gray-600: #4b5563;
        --gray-800: #1f2937;
        --gray-900: #111827;
        --warning: #f59e0b;
        --warning-dark: #d97706;
        --error: #ef4444;
        --radius-lg: 12px;
        --radius-md: 8px;
        --radius-sm: 6px;
        --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
        --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
        --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.1);
        --primary-dark: #0A1A3D;
        --primary-accent: #3A5FCD;
        --light-blue: #E8F1FF;
        --gray-dark: #2C3E50;
        --gray-medium: #6c757d;
        --white: #FFFFFF;
        --transition: 0.3s ease;
    }

    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    body {
        font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
        line-height: 1.5;
        color: var(--gray-900);
        background-color: var(--gray-50);
    }

    .container {
        max-width: 100%;
        margin: 0 auto;
        padding: 0 16px;
    }

    /* Header */
    .header {
        background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
        color: white;
        padding: 24px 16px;
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        box-shadow: var(--shadow-md);
        margin-bottom: 24px;
    }

    .header-content {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .logo-container {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .logo-icon {
        font-size: 28px;
        background: rgba(255,255,255,0.15);
        padding: 10px;
        border-radius: 50%;
    }

    .logo-text h1 {
        font-size: 1.5rem;
        font-weight: 700;
        line-height: 1.2;
    }

    .logo-text .subtitle {
        font-size: 0.875rem;
        opacity: 0.9;
        margin-top: 4px;
    }

    .header-actions {
        display: flex;
        gap: 12px;
    }

    .icon-button {
        background: rgba(255,255,255,0.15);
        border: none;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        color: white;
        cursor: pointer;
        transition: background-color 0.2s;
    }

    .icon-button:hover {
        background: rgba(255,255,255,0.25);
    }

    /* Progress Indicator */
    .progress-indicator {
        display: flex;
        justify-content: center;
        gap: 8px;
        margin-bottom: 32px;
    }

    .progress-step {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 8px;
        flex: 1;
        max-width: 100px;
    }

    .step-circle {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: var(--gray-200);
        color: var(--gray-600);
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 600;
        font-size: 0.875rem;
        transition: all 0.3s ease;
    }

    .step-circle.active {
        background: var(--primary-blue);
        color: white;
    }

    .step-circle.completed {
        background: var(--primary-green);
        color: white;
    }

    .step-label {
        font-size: 0.75rem;
        color: var(--gray-600);
        text-align: center;
        font-weight: 500;
    }

    .step-label.active {
        color: var(--primary-blue);
        font-weight: 600;
    }

    /* Card Styles */
    .card {
        background: white;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-sm);
        padding: 24px;
        margin-bottom: 20px;
        transition: box-shadow 0.3s ease;
        border: 1px solid var(--gray-200);
    }

    .card:hover {
        box-shadow: var(--shadow-md);
    }

    .card-title {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 20px;
        font-size: 1.125rem;
        font-weight: 600;
        color: var(--gray-800);
    }

    .card-title i {
        color: var(--primary-blue);
    }

    /* Form Elements */
    .form-group {
        margin-bottom: 20px;
    }

    .form-row {
        display: flex;
        gap: 16px;
        margin-bottom: 20px;
    }

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

    label {
        display: block;
        margin-bottom: 8px;
        font-weight: 600;
        color: var(--gray-800);
        font-size: 0.875rem;
    }

    .input-group {
        position: relative;
    }

    .input-with-icon {
        position: relative;
    }

    .input-with-icon i {
        position: absolute;
        left: 14px;
        top: 50%;
        transform: translateY(-50%);
        color: var(--gray-400);
    }

    .input-with-icon input,
    .input-with-icon select {
        padding-left: 40px;
    }

    input, select {
        width: 100%;
        padding: 12px 16px;
        border: 1px solid var(--gray-300);
        border-radius: var(--radius-md);
        font-size: 1rem;
        transition: all 0.2s;
        background-color: white;
        font-family: 'Inter', sans-serif;
        cursor: pointer;
    }

    input:focus, select:focus {
        outline: none;
        border-color: var(--primary-blue);
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    input[type="number"] {
        -moz-appearance: textfield;
    }

    input[type="number"]::-webkit-inner-spin-button,
    input[type="number"]::-webkit-outer-spin-button {
        -webkit-appearance: none;
        margin: 0;
    }

    /* Toggle Switch */
    .toggle-container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 12px 0;
        border-bottom: 1px solid var(--gray-100);
    }

    .toggle-label {
        font-weight: 500;
        color: var(--gray-800);
    }

    .toggle-description {
        font-size: 0.75rem;
        color: var(--gray-600);
        margin-top: 4px;
    }

    .toggle-switch {
        position: relative;
        display: inline-block;
        width: 52px;
        height: 28px;
    }

    .toggle-switch input {
        opacity: 0;
        width: 0;
        height: 0;
    }

    .toggle-slider {
        position: absolute;
        cursor: pointer;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--gray-300);
        transition: .4s;
        border-radius: 34px;
    }

    .toggle-slider:before {
        position: absolute;
        content: "";
        height: 20px;
        width: 20px;
        left: 4px;
        bottom: 4px;
        background-color: white;
        transition: .4s;
        border-radius: 50%;
    }

    input:checked + .toggle-slider {
        background-color: var(--primary-blue);
    }

    input:checked + .toggle-slider:before {
        transform: translateX(24px);
    }

    /* Radio & Checkbox Groups */
    .radio-group, .checkbox-group {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 10px;
    }

    .radio-option input, .checkbox-option input {
        display: none;
    }

    .radio-option label, .checkbox-option label {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 14px 12px;
        background: var(--gray-100);
        border: 2px solid transparent;
        border-radius: var(--radius-md);
        text-align: center;
        cursor: pointer;
        transition: all 0.2s;
        font-weight: 500;
        font-size: 0.875rem;
        height: 100%;
    }

    .radio-option input:checked + label,
    .checkbox-option input:checked + label {
        background: rgba(37, 99, 235, 0.1);
        border-color: var(--primary-blue);
        color: var(--primary-blue);
    }

    /* Results Section */
    .results-card {
        border-left: 4px solid var(--primary-green);
    }

    .cost-summary {
        background: var(--gray-50);
        border-radius: var(--radius-md);
        padding: 20px;
        margin-bottom: 20px;
    }

    .total-cost {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 16px;
    }

    .total-label {
        font-size: 1rem;
        font-weight: 600;
        color: var(--gray-800);
    }

    .total-amount {
        font-size: 2rem;
        font-weight: 700;
        color: var(--primary-green);
    }

    .cost-breakdown {
        margin: 20px 0;
    }

    .cost-item {
        display: flex;
        justify-content: space-between;
        padding: 12px 0;
        border-bottom: 1px solid var(--gray-100);
    }

    .cost-item:last-child {
        border-bottom: none;
    }

    .cost-label {
        display: flex;
        align-items: center;
        gap: 8px;
        color: var(--gray-700);
    }

    .cost-label i {
        color: var(--gray-400);
        font-size: 0.875rem;
    }

    .cost-amount {
        font-weight: 600;
        color: var(--gray-800);
    }

    .cost-percentage {
        font-size: 0.75rem;
        color: var(--gray-500);
        margin-left: 8px;
    }

    /* Button Styles */
    .button-container {
        display: flex;
        gap: 12px;
        margin-top: 24px;
    }

    .btn {
        flex: 1;
        padding: 16px 24px;
        border-radius: var(--radius-md);
        font-weight: 600;
        font-size: 1rem;
        cursor: pointer;
        transition: all 0.2s;
        border: none;
        font-family: 'Inter', sans-serif;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
    }

    .btn-primary {
        background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
        color: white;
    }

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-md);
    }

    .btn-secondary {
        background: white;
        color: var(--gray-800);
        border: 1px solid var(--gray-300);
    }

    .btn-secondary:hover {
        background: var(--gray-50);
    }

    .btn-ghost {
        background: transparent;
        color: var(--primary-blue);
        border: 1px solid transparent;
    }

    .btn-ghost:hover {
        background: rgba(37, 99, 235, 0.05);
    }

    /* Alert & Tips */
    .alert {
        padding: 16px;
        border-radius: var(--radius-md);
        margin-bottom: 20px;
        font-size: 0.875rem;
    }

    .alert-info {
        background: rgba(37, 99, 235, 0.05);
        border-left: 4px solid var(--primary-blue);
        color: var(--gray-800);
    }

    .alert-warning {
        background: rgba(245, 158, 11, 0.05);
        border-left: 4px solid var(--warning);
        color: var(--gray-800);
    }

    .tips-container {
        margin-top: 20px;
    }

    .tip-item {
        display: flex;
        gap: 12px;
        padding: 12px 0;
        border-bottom: 1px solid var(--gray-100);
    }

    .tip-item:last-child {
        border-bottom: none;
    }

    .tip-icon {
        color: var(--primary-green);
        font-size: 1rem;
    }

    .tip-content h4 {
        font-size: 0.875rem;
        font-weight: 600;
        margin-bottom: 4px;
        color: var(--gray-800);
    }

    .tip-content p {
        font-size: 0.75rem;
        color: var(--gray-600);
    }

    /* Sidebar Styles */
    .sidebar {
        margin-top: 24px;
    }

    .sidebar-box {
        background: white;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-sm);
        padding: 24px;
        margin-bottom: 20px;
        border: 1px solid var(--gray-200);
    }

    .sidebar-box:hover {
        box-shadow: var(--shadow-md);
    }

    .sidebar-title {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 20px;
        font-size: 1.125rem;
        font-weight: 600;
        color: var(--gray-800);
        border-bottom: 2px solid var(--gray-100);
        padding-bottom: 12px;
    }

    .sidebar-title i {
        color: var(--primary-blue);
    }

    .explanation-item {
        margin-bottom: 20px;
        padding-bottom: 20px;
        border-bottom: 1px solid var(--gray-100);
    }

    .explanation-item:last-child {
        margin-bottom: 0;
        padding-bottom: 0;
        border-bottom: none;
    }

    .explanation-item h4 {
        font-size: 0.875rem;
        font-weight: 600;
        color: var(--primary-blue);
        margin-bottom: 8px;
    }

    .explanation-item p {
        font-size: 0.75rem;
        color: var(--gray-600);
        line-height: 1.5;
    }

    .faq-item {
        margin-bottom: 16px;
        padding-bottom: 16px;
        border-bottom: 1px solid var(--gray-100);
    }

    .faq-item:last-child {
        margin-bottom: 0;
        padding-bottom: 0;
        border-bottom: none;
    }

    .faq-question {
        font-size: 0.875rem;
        font-weight: 600;
        color: var(--gray-800);
        margin-bottom: 8px;
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .faq-question:hover {
        color: var(--primary-blue);
    }

    .faq-question::after {
        content: "▼";
        font-size: 0.75rem;
        transition: transform 0.3s ease;
        color: var(--gray-400);
    }

    .faq-question.active::after {
        transform: rotate(180deg);
    }

    .faq-answer {
        font-size: 0.75rem;
        color: var(--gray-600);
        line-height: 1.5;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
    }

    .faq-answer.active {
        max-height: 200px;
        margin-top: 8px;
    }

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

    .fade-in {
        animation: fadeIn 0.3s ease forwards;
    }

    /* Hidden Class */
    .hidden {
        display: none !important;
    }

    .header-text {
        background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark) 100%);
        color: white;
        text-align: center;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        width: 100%;
        padding-top: 10px;
        padding-bottom: 10px;
        margin-bottom: 20px;
        max-width: 1168px;
        margin-left: auto;
        margin-right: auto;
        padding-left: 0px;
        padding-right: 0px;
        box-sizing: border-box;
        margin-top: 20px;
        border-radius: 10px;
    }

    /* Main Content Area */
    .main-content {
        flex: 1;
        max-width: 1200px;
        width: 100%;
        margin-top: 0;
        margin-right: auto;
        margin-bottom: 0;
        margin-left: auto;
        padding-top: 0px;
        padding-right: 0px;
        padding-bottom: 20px;
        padding-left: 0px;
    }

    .content-placeholder {
        background: var(--white);
        padding: 40px;
        border-radius: 12px;
        box-shadow: 0 5px 20px rgba(0,0,0,0.05);
        text-align: center;
    }

    .content-placeholder h1 {
        color: var(--primary-dark);
        margin-bottom: 20px;
        font-size: 2.2rem;
    }

    .content-placeholder p {
        color: var(--gray-dark);
        font-size: 1.1rem;
        line-height: 1.7;
        margin-bottom: 30px;
        max-width: 800px;
        margin-left: auto;
        margin-right: auto;
    }

    .feature-list {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: 30px;
        margin-top: 40px;
    }

    .feature-item {
        background: var(--light-blue);
        padding: 25px;
        border-radius: 10px;
        width: 300px;
        border: 1px solid rgba(58, 95, 205, 0.1);
    }

    .feature-item h3 {
        color: var(--primary-blue);
        margin-bottom: 10px;
        font-size: 1.3rem;
    }

    .text-center {
        text-align: center;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
        .form-row {
            flex-direction: column;
            gap: 0;
        }
        
        .radio-group, .checkbox-group {
            grid-template-columns: 1fr;
        }
        
        .button-container {
            flex-direction: column;
        }
        
        .header-actions {
            display: none;
        }
        
        .main-content {
            display: block;
        }
        
        .sidebar {
            margin-top: 20px;
        }
        
        .header-text h1 {
            font-size: 1.25rem;
        }
        
        .header-text p {
            font-size: 0.875rem;
        }
    }

    @media (min-width: 768px) {
        .container {
            max-width: 720px;
        }
    }

    @media (min-width: 992px) {
        .container {
            max-width: 1200px;
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 24px;
        }
        
        .header {
            grid-column: 1 / -1;
        }
        
        .progress-indicator {
            grid-column: 1 / -1;
        }
        
        .main-content {
            grid-column: 1;
        }
        
        .sidebar {
            grid-column: 2;
            margin-top: 0;
        }
    }