:root {
    --age-primary: #2563eb;
    --age-primary-dark: #1d4ed8;
    --age-primary-light: #dbeafe;
    --age-success: #10b981;
    --age-warning: #f59e0b;
    --age-error: #ef4444;
    --age-info: #3b82f6;
    --age-surface: #ffffff;
    --age-background: #f8fafc;
    --age-border: #e2e8f0;
    --age-text: #0f172a;
    --age-text-muted: #64748b;
    --age-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
    --age-shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
    --age-shadow-lg: 0 12px 24px rgba(15, 23, 42, 0.12);
    --age-radius-sm: 0.5rem;
    --age-radius-md: 1rem;
    --age-radius-lg: 1.5rem;
    --age-radius-xl: 2rem;
    --age-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.age-calc-page {
    color: var(--age-text);
    padding: 2rem 0;
}

.age-calc-container {
    margin: 0 auto;
}

.age-calc-hero {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2.5rem 1.5rem;
    background: var(--age-surface);
    border-radius: var(--age-radius-xl);
    box-shadow: var(--age-shadow-md);
}

.age-calc-hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--age-text);
    line-height: 1.2;
}

.age-calc-hero .hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--age-text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.6;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.age-calc-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    list-style: none;
    padding: 0;
    margin: 0;
}

.age-calc-meta li {
    padding: 0.5rem 1rem;
    background: var(--age-primary-light);
    color: var(--age-primary-dark);
    border-radius: var(--age-radius-full);
    font-size: 0.875rem;
    font-weight: 600;
}

.calculator-intro {
    margin-bottom: 1.75rem;
}

.calculator-title {
    font-size: clamp(2rem, 4vw, 2.6rem);
    font-weight: 700;
    margin-bottom: 0.4rem;
    color: var(--age-text);
    line-height: 1.2;
}

.calculator-subtitle {
    font-size: 1.05rem;
    color: var(--age-text-muted);
    margin-bottom: 0.9rem;
    line-height: 1.6;
}

.calculator-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0;
    margin: 0;
    list-style: none;
}

.calculator-meta .meta-chip {
    padding: 0.45rem 0.85rem;
    background: var(--age-primary-light);
    color: var(--age-primary-dark);
    border-radius: var(--age-radius-full);
    font-weight: 600;
    font-size: 0.9rem;
}

.age-calc-main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.age-calc-card {
    background: var(--age-surface);
    border-radius: var(--age-radius-lg);
    padding: 2rem;
    box-shadow: var(--age-shadow-md);
    border: 1px solid var(--age-border);
}

.age-calc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.calc-pane {
    display: flex;
    flex-direction: column;
}

.results-pane {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.age-calc-card-header {
    margin-bottom: 1.5rem;
}

.age-calc-card-header .eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--age-primary-dark);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.age-calc-card-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 0.5rem;
    color: var(--age-text);
}

.age-calc-card-header p {
    color: var(--age-text-muted);
    margin: 0;
    font-size: 0.9375rem;
}

.status-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    border-radius: var(--age-radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.status-bar svg {
    flex-shrink: 0;
}

.status-info {
    background: var(--age-primary-light);
    color: var(--age-primary-dark);
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.status-success {
    background: rgba(16, 185, 129, 0.1);
    color: #059669;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-warning {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.status-error {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

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

.input-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--age-text);
}

.label-title {
    flex: 1;
}

.tooltip {
    position: relative;
    display: inline-flex;
}

.tooltip-trigger {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1px solid var(--age-border);
    background: var(--age-surface);
    color: var(--age-text-muted);
    font-size: 0.75rem;
    font-weight: 700;
    cursor: help;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--age-transition);
}

.tooltip-trigger:hover {
    background: var(--age-primary);
    color: white;
    border-color: var(--age-primary);
}

.tooltip-trigger:focus {
    outline: 2px solid var(--age-primary);
    outline-offset: 2px;
}

.tooltiptext {
    visibility: hidden;
    opacity: 0;
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--age-text);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: var(--age-radius-sm);
    font-size: 0.8125rem;
    white-space: nowrap;
    z-index: 1000;
    transition: opacity 0.3s;
    pointer-events: none;
    max-width: 250px;
    white-space: normal;
    text-align: center;
}

.tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--age-text);
}

.tooltip:hover .tooltiptext,
.tooltip-trigger:focus + .tooltiptext {
    visibility: visible;
    opacity: 1;
}

.calculator-input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--age-border);
    border-radius: var(--age-radius-md);
    font-size: 1rem;
    font-weight: 500;
    transition: var(--age-transition);
    background: var(--age-surface);
    color: var(--age-text);
}

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

.calculator-input:invalid {
    border-color: var(--age-error);
}

.input-help {
    margin-top: 0.5rem;
    font-size: 0.8125rem;
    color: var(--age-text-muted);
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.calculate-btn {
    flex: 1;
    min-width: 140px;
    padding: 0.875rem 1.5rem;
    background: var(--age-primary);
    color: white;
    border: none;
    border-radius: var(--age-radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--age-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.calculate-btn:hover {
    background: var(--age-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--age-shadow-md);
}

.calculate-btn:active {
    transform: translateY(0);
}

.calculate-btn:focus {
    outline: 2px solid var(--age-primary);
    outline-offset: 2px;
}

.ghost-btn {
    padding: 0.875rem 1.5rem;
    background: transparent;
    color: var(--age-text);
    border: 2px solid var(--age-border);
    border-radius: var(--age-radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--age-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.ghost-btn:hover {
    background: var(--age-background);
    border-color: var(--age-text-muted);
}

.ghost-btn:focus {
    outline: 2px solid var(--age-primary);
    outline-offset: 2px;
}

.results-container {
    background: var(--age-surface);
    border-radius: var(--age-radius-lg);
    padding: 2rem;
    box-shadow: var(--age-shadow-md);
    border: 1px solid var(--age-border);
    margin-top: 1.5rem;
}

.results-empty {
    background: var(--age-background);
    border-style: dashed;
}

.results-header {
    margin-bottom: 1.5rem;
}

.results-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 0.5rem;
    color: var(--age-text);
}

.empty-state-content {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--age-text-muted);
}

.empty-state-icon {
    margin: 0 auto 1rem;
    color: var(--age-text-muted);
    opacity: 0.5;
}

.result-content {
    margin-bottom: 1.5rem;
}

.result-main {
    text-align: center;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(16, 185, 129, 0.05));
    border-radius: var(--age-radius-md);
    margin-bottom: 1.5rem;
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.result-label {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--age-text-muted);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.result-value {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--age-primary);
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.result-date {
    font-size: 1.125rem;
    color: var(--age-text-muted);
    font-weight: 500;
}

.result-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.breakdown-item {
    padding: 1rem;
    background: var(--age-background);
    border-radius: var(--age-radius-md);
    border: 1px solid var(--age-border);
    text-align: center;
}

.breakdown-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--age-text-muted);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.breakdown-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--age-text);
}

.result-actions {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--age-border);
}

.copy-buttons-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.copy-button {
    flex: 1;
    min-width: 120px;
    padding: 0.85rem 1rem;
    background: var(--age-surface);
    color: var(--age-text);
    border: 1.5px solid var(--age-border);
    border-radius: var(--age-radius-md);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--age-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.copy-button:hover {
    background: var(--age-primary);
    color: white;
    border-color: var(--age-primary);
    box-shadow: var(--age-shadow-sm);
}

.copy-button:focus {
    outline: 2px solid var(--age-primary);
    outline-offset: 2px;
}

.copy-button.copied {
    background: var(--age-success);
    color: white;
    border-color: var(--age-success);
    box-shadow: var(--age-shadow-sm);
}

.share-container {
    margin-top: 1.5rem;
}

.share-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--age-text-muted);
    margin-bottom: 0.75rem;
    text-align: center;
}

.share-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.share-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1rem;
    min-height: 44px;
    border-radius: var(--age-radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--age-transition);
    border: 1.5px solid var(--age-border);
    background: var(--age-surface);
    color: var(--age-text);
}

.share-btn:focus {
    outline: 2px solid var(--age-primary);
    outline-offset: 2px;
}

.share-btn:hover {
    background: var(--age-primary);
    color: white;
    border-color: var(--age-primary);
    transform: translateY(-1px);
    box-shadow: var(--age-shadow-sm);
}

.age-card {
    padding: 0 1rem;
}

.age-education-card {
    background: var(--age-surface);
    padding: 3rem 2rem;
    border-radius: var(--age-radius-lg);
    box-shadow: var(--age-shadow-sm);
    line-height: 1.75;
}

.age-education-card h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--age-text);
}

.age-education-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--age-text);
}

.age-education-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--age-text);
}

.age-education-card p {
    margin-bottom: 1.25rem;
    color: var(--age-text);
    font-size: 1.0625rem;
}

.age-education-card ul,
.age-education-card ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.age-education-card li {
    margin-bottom: 0.75rem;
    color: var(--age-text);
    font-size: 1.0625rem;
}

.age-education-card a {
    color: var(--age-primary);
    text-decoration: none;
    font-weight: 600;
}

.age-education-card a:hover {
    text-decoration: underline;
}

.infographic-timeline {
    margin: 2rem 0;
    padding: 2rem;
    background: var(--age-background);
    border-radius: var(--age-radius-lg);
    border: 1px solid var(--age-border);
}

.infographic-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--age-text);
}

.infographic-conversion-formula {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
    padding: 2rem;
    background: var(--age-background);
    border-radius: var(--age-radius-lg);
    border: 1px solid var(--age-border);
}

.formula-box {
    text-align: center;
    padding: 1.5rem;
    background: var(--age-surface);
    border-radius: var(--age-radius-md);
    border: 1px solid var(--age-border);
}

.formula-label {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--age-primary);
    margin-bottom: 0.5rem;
}

.formula-content {
    font-size: 1rem;
    font-weight: 600;
    color: var(--age-text);
    margin-bottom: 0.5rem;
}

.formula-example {
    font-size: 0.875rem;
    color: var(--age-text-muted);
}

.faq-section {
    margin: 3rem 0 2rem;
}

.faq-card {
    background: var(--age-surface);
    border: 1px solid var(--age-border);
    border-radius: var(--age-radius-lg);
    box-shadow: var(--age-shadow-sm);
    padding: 1.75rem;
}

.faq-header h2 {
    margin: 0 0 0.5rem;
    color: var(--age-text);
    font-weight: 700;
}

.faq-header p {
    margin: 0;
    color: var(--age-text-muted);
}

.faq-grid details {
    border: 1px solid var(--age-border);
    border-radius: var(--age-radius-md);
    padding: 1rem 1.25rem;
    margin-top: 0.75rem;
    background: var(--age-background);
}

.faq-grid summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--age-text);
    outline: none;
}

.faq-grid p {
    margin-top: 0.6rem;
    color: var(--age-text-muted);
}

.related-tools-section {
    margin: 3rem 0;
}

.related-links {
    background: var(--age-surface);
    border: 1px solid var(--age-border);
    border-radius: var(--age-radius-lg);
    box-shadow: var(--age-shadow-sm);
    padding: 1.75rem;
}

.related-links h2 {
    margin: 0 0 1rem;
    color: var(--age-text);
    font-weight: 700;
}

.related-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 0.75rem;
}

.related-links li {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.related-links a {
    color: var(--age-primary-dark);
    font-weight: 600;
    text-decoration: none;
}

.related-links a:hover {
    color: var(--age-primary);
}

.related-links span {
    color: var(--age-text-muted);
    font-size: 0.95rem;
}

.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;
}

@media (max-width: 768px) {
    .age-calc-page {
        padding: 1.5rem 0 3rem;
    }

    .age-calc-hero {
        padding: 2rem 1rem;
    }

    .age-calc-card {
        padding: 1.5rem;
    }

    .age-calc-main {
        grid-template-columns: 1fr;
    }

    .form-actions {
        flex-direction: column;
    }

    .calculate-btn,
    .ghost-btn {
        width: 100%;
    }

    .copy-buttons-row {
        flex-direction: column;
    }

    .copy-button {
        width: 100%;
    }

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

    .age-education-card {
        padding: 2rem 1.5rem;
    }

    .infographic-conversion-formula {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .age-calc-hero h1 {
        font-size: 1.75rem;
    }

    .age-calc-card {
        padding: 1.25rem;
    }

    .result-main {
        padding: 1.5rem;
    }

    .result-value {
        font-size: 1.75rem;
    }
}