:root {
    --brand-navy: #1B2B48;
    --brand-accent: #1D6F8A;
    --brand-accent-light: #E6F3F7;
    --brand-teal: #0D9488;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --border-color: #E2E8F0;
    --card-bg: #FFFFFF;
    --warning-bg: #FEF3C7;
    --warning-border: #F59E0B;
    --warning-text: #92400E;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --max-width: 860px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --brand-navy: #93C5FD;
        --brand-accent: #38BDF8;
        --brand-accent-light: #0C4A6E;
        --brand-teal: #2DD4BF;
        --bg-primary: #0B1120;
        --bg-secondary: #0F172A;
        --bg-tertiary: #1E293B;
        --text-primary: #F8FAFC;
        --text-secondary: #CBD5E1;
        --text-muted: #94A3B8;
        --border-color: #334155;
        --card-bg: #1E293B;
        --warning-bg: #451A03;
        --warning-border: #D97706;
        --warning-text: #FDE68A;
    }
}

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

body {
    font-family: var(--font-sans);
    line-height: 1.65;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
}

.site-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.2rem;
}

.brand-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #1B2B48 0%, #1D6F8A 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
    font-size: 1rem;
}

.nav-links {
    display: flex;
    gap: 1.25rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--brand-accent);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}

h1 {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--brand-navy);
    letter-spacing: -0.025em;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

h2 {
    font-size: 1.45rem;
    font-weight: 700;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.4rem;
}

h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

p {
    margin-bottom: 1.15rem;
    color: var(--text-secondary);
}

ul, ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.5rem;
}

strong {
    color: var(--text-primary);
}

a {
    color: var(--brand-accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

a:hover {
    color: var(--brand-teal);
}

.medical-disclaimer-banner {
    background-color: var(--warning-bg);
    border-left: 4px solid var(--warning-border);
    padding: 1rem 1.25rem;
    border-radius: 0 8px 8px 0;
    margin-bottom: 2rem;
}

.medical-disclaimer-banner h4 {
    color: var(--warning-text);
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.medical-disclaimer-banner p {
    color: var(--warning-text);
    font-size: 0.9rem;
    margin-bottom: 0;
    line-height: 1.45;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
    margin: 2rem 0;
}

.feature-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.feature-card h3 {
    margin-top: 0;
    color: var(--brand-accent);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.feature-card p {
    font-size: 0.925rem;
    margin-bottom: 0;
}

.callout-box {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1.25rem;
    margin: 1.5rem 0;
}

.callout-box p:last-child {
    margin-bottom: 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.925rem;
}

th, td {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    text-align: left;
}

th {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
}

.site-footer {
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    padding: 2.5rem 0 3.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.footer-nav {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
}

.footer-nav a:hover {
    color: var(--brand-accent);
}

.footer-disclaimer {
    font-size: 0.825rem;
    line-height: 1.45;
}

@media (max-width: 640px) {
    .header-container {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    h1 {
        font-size: 1.85rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
}