/* --- THE "CLINICAL RESEARCH" THEME --- */
:root {
    /* --- NEW COLOR PALETTE --- */
    --bg-color: #F6F7F4;       /* Main Background */
    --brand-color: #879FB0;    /* Company Name (Muted Blue-Grey) */
    --sub-header: #6FAFA6;     /* Subheaders (Sage Green) */
    --text-primary: #303437;   /* Main Text (Dark Charcoal) */
    --secondary-elements: #B4AEC3; /* Quotes, Footnotes, Separators (Lavender Grey) */
    --highlight: #D9A29A;      /* Highlights/Numbers (Dusty Rose) */
    
    /* --- UTILITIES --- */
    --card-bg: #FFFFFF;
    --border-color: #E6E4E1;
    --font-serif: "Georgia", "Times New Roman", serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* --- TOP NAVIGATION BAR --- */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--secondary-elements); /* Using lavender grey for subtle border */
    position: sticky;
    top: 0;
    z-index: 100;
    padding-block: 1rem;
    padding-inline: max(2rem, calc((100% - 1000px) / 2));
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-family: var(--font-serif);
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--brand-color);
    text-decoration: none;
}

/* The logo icon */
.nav-icon {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    object-fit: contain;
}

.nav-right ul {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-right a {
    text-decoration: none;
    color: var(--secondary-elements); /* Lavender Grey for inactive links */
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-right a:hover, .nav-right a.current {
    color: var(--brand-color); /* Blue-Grey on hover/active */
}

/* --- TYPOGRAPHY --- */
h1 {
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.1;
}

h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--sub-header); /* Sage Green for H2 Subheaders */
}

h3 {
    font-family: var(--font-serif);
    font-weight: 400;
    color: var(--text-primary);
}

p {
    color: var(--text-primary);
    font-size: 1.125rem;
    max-width: 650px;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

/* --- LAYOUT UTILS --- */
main {
    flex: 1;
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
    padding: 6rem 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: left;
}

.content-center {
    align-items: center;
    text-align: center;
}

/* --- CARDS & GRIDS --- */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    width: 100%;
    margin-top: 3rem;
}

.product-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.2s ease;
}

.product-card:hover {
    border-color: var(--sub-header); /* Green border on hover */
    box-shadow: 0 4px 20px rgba(0,0,0,0.04);
}

.product-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--highlight); /* Dusty Rose for tags/key info */
    background: rgba(217, 162, 154, 0.1); /* Low opacity rose */
    padding: 4px 8px;
    border-radius: 4px;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* --- BUTTONS --- */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--sub-header); /* Sage Green Buttons */
    color: #fff;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-family: var(--font-sans);
    margin-top: 1rem;
}

.cta-button:hover {
    background-color: var(--brand-color); /* Hover to Blue-Grey */
}

/* --- SPECIFIC TEXT STYLES --- */
.highlight-text {
    color: var(--highlight);
    font-weight: 600;
}

blockquote {
    border-left: 3px solid var(--secondary-elements); /* Lavender Grey Border */
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--secondary-elements); /* Lavender Grey Text */
    font-family: var(--font-serif);
}

/* --- MATH/PROTOCOL --- */
.equation-block {
    font-family: "Times New Roman", serif;
    font-size: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--secondary-elements);
    padding: 2rem;
    border-radius: 8px;
    margin: 2rem 0;
    text-align: center;
    color: var(--text-primary);
}

/* --- FOOTER --- */
footer {
    padding: 2rem;
    border-top: 1px solid var(--secondary-elements);
    text-align: center;
    font-size: 0.85rem;
    color: var(--secondary-elements); /* Lavender Grey */
}