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

:root {
    --primary-color: #0f172a;
    --secondary-color: #059669;
    --accent-color: #3b82f6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --text-color: #374151;
    --light-text: #6b7280;
    --bg-color: #f9fafb;
    --white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --finance-green: #16a34a;
    --finance-blue: #2563eb;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.calculator-container {
    min-height: 100vh;
}

.calculator-header {
    background: var(--white);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--primary-color);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background: var(--finance-blue);
    color: var(--white);
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: var(--transition);
}

.back-btn:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
}

.calculator-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.intro-section {
    margin-bottom: 2rem;
}

.intro-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.intro-card h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.intro-card p {
    color: var(--text-color);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.einstein-quote {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 1px solid #0ea5e9;
    border-radius: 0.5rem;
    padding: 1.5rem;
    color: #075985;
    font-size: 1rem;
    line-height: 1.6;
    text-align: center;
    font-style: italic;
}

.calculator-section {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.input-panel, .results-panel {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.input-panel {
    height: fit-content;
    position: sticky;
    top: 120px;
}

.input-panel h3, .results-panel h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.input-with-prefix, .input-with-suffix {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-prefix {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--light-text);
    font-weight: 600;
    font-size: 1rem;
    z-index: 10;
    pointer-events: none;
    background: var(--white);
    padding: 0 2px;
}

.input-with-prefix input {
    padding-left: 2rem !important;
    text-indent: 1rem;
}

.percent-suffix, .years-suffix {
    position: absolute;
    right: 1rem;
    color: var(--light-text);
    font-weight: 600;
    z-index: 2;
}

.input-with-suffix input {
    padding-right: 3rem;
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
    color: var(--text-color);
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.1);
}

.field-note {
    font-size: 0.875rem;
    color: var(--light-text);
    margin-top: 0.5rem;
    font-style: italic;
}

.calculate-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: var(--finance-green);
    color: var(--white);
    border: none;
    border-radius: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.calculate-btn:hover {
    background: #15803d;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.quick-scenarios {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.quick-scenarios h4 {
    color: var(--primary-color);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.scenario-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.scenario-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-color);
    background: var(--white);
    color: var(--text-color);
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
}

.scenario-btn:hover {
    border-color: var(--secondary-color);
    background: #f0fdf4;
    color: var(--secondary-color);
}

.results-content {
    min-height: 400px;
}

.metric-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.metric-card {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    text-align: center;
}

.metric-label {
    font-size: 0.875rem;
    color: var(--light-text);
    font-weight: 500;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--finance-green);
}

.chart-container {
    margin-bottom: 2rem;
    height: 300px;
    position: relative;
}

.breakdown-section h4 {
    color: var(--primary-color);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.yearly-table {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
}

.yearly-table table {
    width: 100%;
    border-collapse: collapse;
}

.yearly-table th {
    background: var(--bg-color);
    padding: 0.75rem;
    text-align: left;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.875rem;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
}

.yearly-table td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
}

.yearly-table tr:hover {
    background: #f8fafc;
}

.education-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.education-card, .tips-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.education-card h3, .tips-card h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.concept-item, .tip-item {
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    line-height: 1.6;
}

.concept-item:last-child, .tip-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.disclaimer-section {
    margin-bottom: 2rem;
}

.disclaimer-card {
    background: #fef7cd;
    border: 1px solid var(--warning-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.disclaimer-card h4 {
    color: #92400e;
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.disclaimer-card p {
    color: #92400e;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.disclaimer-card p:last-child {
    margin-bottom: 0;
    font-weight: 600;
}

@media (max-width: 1024px) {
    .calculator-section {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .input-panel {
        position: static;
    }
    
    .education-section {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

@media (max-width: 768px) {
    .calculator-content {
        padding: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .header-content h1 {
        font-size: 1.5rem;
    }
    
    .input-panel, .results-panel, .intro-card, .education-card, .tips-card, .disclaimer-card {
        padding: 1.5rem;
    }
    
    .metric-cards {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: 0.75rem;
    }
    
    .metric-card {
        padding: 1rem;
    }
    
    .metric-value {
        font-size: 1.25rem;
    }
    
    .scenario-buttons {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .calculator-content {
        padding: 0.5rem;
    }
    
    .metric-cards {
        grid-template-columns: 1fr;
    }
    
    .yearly-table th, .yearly-table td {
        padding: 0.5rem;
        font-size: 0.8rem;
    }
}