:root {
    --Color-primary-500: #1e40af;
    --Color-primary-600: #1d4ed8;
    --Color-primary-700: #1e3a8a;
    --Color-primary-50: #eff6ff;
    --Color-primary-100: #dbeafe;
    --Color-gray-50: #f9fafb;
    --Color-gray-100: #f3f4f6;
    --Color-gray-200: #e5e7eb;
    --Color-gray-300: #d1d5db;
    --Color-gray-400: #9ca3af;
    --Color-gray-500: #6b7280;
    --Color-gray-600: #4b5563;
    --Color-gray-700: #374151;
    --Color-gray-800: #1f2937;
    --Color-gray-900: #111827;
    --Color-white: #ffffff;
    --Color-green-500: #10b981;
    --Color-red-500: #ef4444;
    --Color-amber-500: #f59e0b;
    --Typography-fs-xs: 0.75rem;
    --Typography-fs-sm: 0.875rem;
    --Typography-fs-base: 1rem;
    --Typography-fs-lg: 1.125rem;
    --Typography-fs-xl: 1.25rem;
    --Typography-fs-2xl: 1.5rem;
    --Typography-fs-3xl: 1.875rem;
    --Typography-fs-4xl: 2.25rem;
    --Typography-lh-tight: 1.25;
    --Typography-lh-normal: 1.5;
    --Typography-lh-relaxed: 1.625;
    --Typography-fw-normal: 400;
    --Typography-fw-medium: 500;
    --Typography-fw-semibold: 600;
    --Typography-fw-bold: 700;
    --Spacing-sp-xxxs: 0.25rem;
    --Spacing-sp-xxs: 0.5rem;
    --Spacing-sp-xs: 0.75rem;
    --Spacing-sp-sm: 1rem;
    --Spacing-sp-md: 1.5rem;
    --Spacing-sp-lg: 2rem;
    --Spacing-sp-xl: 2.5rem;
    --Spacing-sp-2xl: 3rem;
    --Border-radius-sm: 0.375rem;
    --Border-radius-md: 0.5rem;
    --Border-radius-lg: 0.75rem;
    --Border-radius-xl: 1rem;
    --Shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --Shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --Shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --Shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.refinance-calculator * {
    box-sizing: border-box;
}

.refinance-calculator {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    max-width: 100%;
    margin: 0 auto;
    padding: var(--Spacing-sp-md);
    background: var(--Color-gray-50);
}

.charts-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 8px;
}

.chart-card {
    background: transparent;
    border-radius: var(--Border-radius-xl);
    padding: var(--Spacing-sp-lg);
    box-shadow: none;
    border: none;
}

.chart-header {
    text-align: center;
    margin-bottom: 4px;
}

.chart-title {
    font-size: var(--Typography-fs-lg);
    font-weight: var(--Typography-fw-semibold);
    color: var(--Color-gray-900);
    line-height: var(--Typography-lh-tight);
}

.chart-container {
    height: 200px;
    position: relative;
    width: 100%;
}

    .chart-container canvas {
        max-height: 200px;
    }

.input-sections {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-bottom: 8px;
}

.input-card {
    background: var(--Color-white);
    border-radius: var(--Border-radius-lg);
    padding: var(--Spacing-sp-md);
    box-shadow: var(--Shadow-sm);
    border: 1px solid var(--Color-gray-200);
}

.input-card-title {
    font-size: var(--Typography-fs-lg);
    font-weight: var(--Typography-fw-semibold);
    color: var(--Color-gray-900);
    margin-bottom: var(--Spacing-sp-md);
    line-height: var(--Typography-lh-tight);
}

.form-group {
    margin-bottom: 8px;
}

    .form-group:last-child {
        margin-bottom: 0;
    }

.form-label-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 4px;
    width: 100%;
    min-height: 20px;
}

.form-label {
    font-size: var(--Typography-fs-sm);
    font-weight: var(--Typography-fw-medium);
    color: var(--Color-gray-700);
    line-height: var(--Typography-lh-normal);
    margin: 0;
    flex: 1;
    word-wrap: break-word;
    hyphens: auto;
    padding-right: 8px;
}

.info-icon {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--Color-gray-400);
    color: var(--Color-white);
    font-size: 10px;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: help;
    flex-shrink: 0;
    transition: background-color 0.2s ease;
    border: none;
}

    .info-icon:hover {
        background: var(--Color-gray-500);
    }

    .info-icon:focus {
        outline: 2px solid var(--Color-primary-500);
        outline-offset: 2px;
    }

.input-group {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.input-group-text {
    background: var(--Color-gray-100);
    color: var(--Color-gray-600);
    font-size: var(--Typography-fs-sm);
    font-weight: var(--Typography-fw-medium);
    padding: var(--Spacing-sp-xs) var(--Spacing-sp-xs);
    border: 1px solid var(--Color-gray-300);
    border-radius: var(--Border-radius-sm) 0 0 var(--Border-radius-sm);
    white-space: nowrap;
    line-height: var(--Typography-lh-normal);
}

    .input-group-text:last-child {
        border-radius: 0 var(--Border-radius-sm) var(--Border-radius-sm) 0;
        border-left: none;
    }

.form-control {
    flex: 1;
    font-size: var(--Typography-fs-sm);
    font-weight: var(--Typography-fw-normal);
    color: var(--Color-gray-900);
    background: var(--Color-white);
    border: 1px solid var(--Color-gray-300);
    border-radius: var(--Border-radius-sm);
    padding: var(--Spacing-sp-xs) var(--Spacing-sp-xs);
    line-height: var(--Typography-lh-normal);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.input-group .form-control {
    border-radius: 0;
    border-left: 0;
    border-right: 0;
}

    .input-group .form-control:first-child {
        border-left: 1px solid var(--Color-gray-300);
        border-radius: var(--Border-radius-sm) 0 0 var(--Border-radius-sm);
    }

    .input-group .form-control:last-child {
        border-right: 1px solid var(--Color-gray-300);
        border-radius: 0 var(--Border-radius-sm) var(--Border-radius-sm) 0;
    }

.form-control:focus {
    outline: none;
    border-color: var(--Color-primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-select {
    font-size: var(--Typography-fs-sm);
    font-weight: var(--Typography-fw-normal);
    color: var(--Color-gray-900);
    background: var(--Color-white);
    border: 1px solid var(--Color-gray-300);
    border-radius: var(--Border-radius-sm);
    padding: var(--Spacing-sp-xs) var(--Spacing-sp-xs);
    line-height: var(--Typography-lh-normal);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

    .form-select:focus {
        outline: none;
        border-color: var(--Color-primary-500);
        box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    }

/* Responsive Design */
@media (max-width: 1200px) {
    .charts-section {
        gap: var(--Spacing-sp-xs);
    }

    .input-sections {
        gap: var(--Spacing-sp-xs);
    }

    .chart-card {
        padding: var(--Spacing-sp-md);
    }
}

@media (max-width: 992px) {
    .charts-section {
        grid-template-columns: 1fr;
        gap: var(--Spacing-sp-md);
    }

    .input-sections {
        grid-template-columns: 1fr;
        gap: var(--Spacing-sp-md);
    }

    .chart-card {
        padding: var(--Spacing-sp-md);
    }

    .input-card {
        padding: var(--Spacing-sp-md);
    }
}

@media (max-width: 768px) {
    .refinance-calculator {
        padding: var(--Spacing-sp-sm);
    }

    .charts-section {
        gap: var(--Spacing-sp-sm);
    }

    .input-sections {
        gap: var(--Spacing-sp-sm);
    }

    .chart-card {
        padding: var(--Spacing-sp-sm);
    }

    .input-card {
        padding: var(--Spacing-sp-sm);
    }

    .chart-container {
        height: 160px;
        width: 100%;
        overflow: hidden;
    }

        .chart-container canvas {
            max-height: 160px;
            max-width: 100%;
        }

    .chart-title {
        font-size: var(--Typography-fs-sm);
        line-height: var(--Typography-lh-tight);
    }

    .form-group .row {
        margin-bottom: var(--Spacing-sp-xs);
    }

    .form-label-container {
        min-height: 18px;
    }

    .form-label {
        font-size: var(--Typography-fs-xs);
        line-height: var(--Typography-lh-tight);
        padding-right: 6px;
    }

    .info-icon {
        width: 12px;
        height: 12px;
        font-size: 8px;
    }
}

@media (max-width: 576px) {
    .form-group .col-6:first-child {
        margin-bottom: var(--Spacing-sp-xxs);
    }

    .chart-card {
        padding: var(--Spacing-sp-xs);
    }

    .chart-container {
        height: 140px;
    }

        .chart-container canvas {
            max-height: 140px;
        }

    .chart-title {
        font-size: var(--Typography-fs-xs);
        line-height: var(--Typography-lh-tight);
        margin-bottom: var(--Spacing-sp-xs);
    }

    .input-card-title {
        font-size: var(--Typography-fs-base);
    }

    .form-label-container {
        min-height: 16px;
    }

    .form-label {
        font-size: var(--Typography-fs-xs);
        line-height: 1.2;
        padding-right: 4px;
    }

    .info-icon {
        width: 11px;
        height: 11px;
        font-size: 7px;
    }
}

.tooltip-container {
    position: relative;
    display: inline-block;
}

.info-icon[data-tooltip]:hover::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    right: 0;
    background: var(--Color-gray-800);
    color: var(--Color-white);
    padding: var(--Spacing-sp-sm) var(--Spacing-sp-md);
    border-radius: var(--Border-radius-md);
    font-size: var(--Typography-fs-sm);
    z-index: 1000;
    box-shadow: var(--Shadow-lg);
    max-width: 280px;
    min-width: 200px;
    white-space: normal;
    word-wrap: break-word;
    line-height: var(--Typography-lh-normal);
    font-weight: normal;
}

.info-icon[data-tooltip]:hover::after {
    content: '';
    position: absolute;
    top: -5px;
    right: 10px;
    border: 5px solid transparent;
    border-top-color: var(--Color-gray-800);
    z-index: 1001;
}

@media (max-width: 768px) {
    .info-icon[data-tooltip]:hover::before {
        font-size: var(--Typography-fs-xs);
        padding: var(--Spacing-sp-xs) var(--Spacing-sp-sm);
        max-width: 220px;
        min-width: 160px;
    }

    .info-icon[data-tooltip]:hover::after {
        border-width: 4px;
    }
}