:root {
    --primary-color: #2563eb;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --dark-bg: #1e293b;
    --light-bg: #f8fafc;
    --border-color: #e2e8f0;
    --text-dark: #0f172a;
    --text-light: #64748b;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --card-hover-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-bg);
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 30px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

h1 {
    color: var(--text-dark);
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
}

h2 {
    color: var(--text-dark);
    font-size: 1.8rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

h3 {
    color: var(--text-dark);
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.info-box {
    background-color: #dbeafe;
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    margin-bottom: 30px;
    border-radius: 8px;
}

.info-box h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.info-box ul {
    list-style: none;
    padding-left: 0;
}

.info-box li {
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
}

.info-box li:before {
    content: "•";
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.form-section {
    margin-bottom: 40px;
}

.section-description {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.input-group {
    margin-bottom: 20px;
}

.account-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.account-row:last-child {
    border-bottom: none;
}

.account-row .input-group {
    margin-bottom: 0;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
}

input[type="number"],
input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input[type="number"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

small {
    display: block;
    color: var(--text-light);
    font-size: 0.85rem;
    margin-top: 5px;
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin: 10px 0;
}

.radio-group-inline {
    display: flex;
    gap: 20px;
    margin: 10px 0;
}

.radio-label {
    display: flex;
    align-items: center;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.radio-label:hover {
    border-color: var(--primary-color);
    background-color: var(--light-bg);
}

.radio-label input[type="radio"] {
    width: auto;
    margin-right: 10px;
    cursor: pointer;
}

.radio-label input[type="radio"]:checked + span {
    color: var(--primary-color);
    font-weight: 600;
}

.radio-label span {
    flex: 1;
}

.radio-label-inline {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.radio-label-inline input[type="radio"] {
    width: auto;
    margin-right: 8px;
    cursor: pointer;
}

.radio-label-inline span {
    font-weight: 500;
}

.radio-label-inline input[type="radio"]:checked + span {
    color: var(--primary-color);
    font-weight: 600;
}

.btn {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
    padding: 16px;
    font-size: 1.1rem;
    margin-top: 20px;
}

.btn-primary:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: var(--card-hover-shadow);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    margin-top: 10px;
}

.btn-secondary:hover {
    background-color: #059669;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.contribution-period {
    background-color: var(--light-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.contribution-period-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.contribution-period-header h4 {
    color: var(--text-dark);
    font-size: 1.1rem;
}

.contribution-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.period-basics-row {
    display: grid;
    grid-template-columns: 2fr 1.5fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.account-groups {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 20px;
}

.account-group {
    border: 3px solid;
    border-radius: 8px;
    padding: 15px;
}

.account-group h5 {
    margin: 0 0 15px 0;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
}

.tax-deferred-group {
    border-color: #667eea;
    background-color: rgba(102, 126, 234, 0.05);
}

.tax-deferred-group h5 {
    color: #667eea;
}

.tax-free-group {
    border-color: #f5576c;
    background-color: rgba(245, 87, 108, 0.05);
}

.tax-free-group h5 {
    color: #f5576c;
}

.taxable-group {
    border-color: #00f2fe;
    background-color: rgba(0, 242, 254, 0.05);
}

.taxable-group h5 {
    color: #00a8b3;
}

.account-group .input-group {
    margin-bottom: 15px;
}

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

.lump-sum-section {
    margin-top: 20px;
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
}

.lump-sum-toggle {
    background: none;
    border: none;
    color: var(--primary-color);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.3s;
}

.lump-sum-toggle:hover {
    color: #1d4ed8;
}

.toggle-icon {
    font-size: 0.8rem;
    display: inline-block;
    transition: transform 0.3s;
}

.lump-sum-inputs {
    margin-top: 15px;
    padding: 20px;
    background-color: var(--light-bg);
    border-radius: 8px;
    border: 2px solid var(--border-color);
}

.lump-sum-description {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.lump-sum-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

@media (max-width: 768px) {
    .lump-sum-grid {
        grid-template-columns: 1fr;
    }
}

.results {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 3px solid var(--primary-color);
}

.results.hidden {
    display: none;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.result-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s;
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-hover-shadow);
}

.result-card:nth-child(1) {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.result-card:nth-child(2) {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.result-card:nth-child(3) {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.result-card h3 {
    color: white;
    font-size: 1.2rem;
    margin-bottom: 15px;
    opacity: 0.9;
}

.result-amount {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 20px;
}

.result-details {
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    padding-top: 15px;
}

.result-details p {
    margin-bottom: 8px;
    font-size: 0.95rem;
    opacity: 0.9;
}

.result-details span {
    float: right;
    font-weight: 600;
}

.bucket3-breakdown {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px dashed rgba(255, 255, 255, 0.4);
}

.bucket3-breakdown .breakdown-title {
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    opacity: 0.95;
    margin-bottom: 8px;
}

.period-results {
    margin-bottom: 30px;
    background-color: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
}

.period-results h3 {
    color: var(--text-dark);
    margin-bottom: 20px;
    text-align: center;
}

.period-results-table {
    overflow-x: auto;
}

.period-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    border: 2px solid var(--secondary-color);
}

.period-table th {
    background-color: var(--primary-color);
    color: white;
    padding: 12px;
    text-align: left;
    font-weight: 600;
}

.period-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
}

.period-table tr:hover {
    background-color: var(--light-bg);
}

.period-table tr:last-child td {
    border-bottom: none;
}

.period-table .period-number {
    font-weight: 600;
    color: var(--primary-color);
}

.period-table .period-cell {
    white-space: nowrap;
}

.period-table .period-name {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
    white-space: nowrap;
}

.period-table .period-duration {
    font-size: 0.85em;
    color: var(--text-light);
    font-weight: normal;
}

.period-table .amount {
    text-align: right;
    font-family: 'Courier New', monospace;
}

.period-table .income-column {
    border-left: 3px solid var(--secondary-color);
    font-weight: 600;
}

.period-table tbody .income-column {
    background-color: rgba(16, 185, 129, 0.05);
}

.total-summary {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--card-shadow);
}

.total-summary h3 {
    color: white;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.total-amount {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 20px;
}

.total-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.total-breakdown p {
    font-size: 1rem;
}

.total-breakdown span {
    display: block;
    font-weight: 600;
    font-size: 1.2rem;
    margin-top: 5px;
}

footer {
    max-width: 1200px;
    margin: 30px auto 0;
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

footer p {
    margin-bottom: 10px;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .contribution-row {
        grid-template-columns: 1fr;
    }
    
    .account-groups {
        grid-template-columns: 1fr;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .total-breakdown {
        grid-template-columns: 1fr;
    }

    .result-amount {
        font-size: 2rem;
    }

    .total-amount {
        font-size: 2.5rem;
    }
}