:root {
    --primary-color: #1a73e8;
    --primary-color-darker: #1765cc;
    --text-color: #202124;
    --muted-color: #5f6368;
    --border-color: #dadce0;
    --background-color: #ffffff;
    --accent-bg-color: #f8f9fa;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

body {
    font-family: var(--font-family);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
    box-sizing: border-box;
}

h1, h2, h3 {
    line-height: 1.3;
    margin-bottom: 1rem;
    font-weight: 600;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease-in-out;
}

a:hover {
    text-decoration: underline;
    color: var(--primary-color-darker);
}

img {
    max-width: 100%;
    height: auto;
}

.site-header {
    background-color: var(--background-color);
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-header .brand {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-color);
}

.site-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.site-nav li {
    margin-left: 25px;
}

.site-nav a {
    font-size: 1.1rem;
    color: var(--text-color);
    font-weight: 500;
}

.site-nav a.active {
    color: var(--primary-color);
    font-weight: 700;
}

.site-nav a:hover {
    color: var(--primary-color);
    text-decoration: none;
}

main {
    flex: 1;
    padding: 2.5rem 0;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    text-align: left;
}

.card {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.card-header {
    font-size: 1.6rem;
    margin-top: 0;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.bio-grid {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 2.5rem;
    align-items: center;
}

.bio-grid img {
    border-radius: 8px;
}

.bio-details p {
    margin: 0 0 1rem 0;
}

.bio-details p:last-child {
    margin-bottom: 0;
}

.card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.card li {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border-color);
}

.card li:last-child {
    border-bottom: none;
}

.research-list li {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.research-list .vuln-title {
    font-weight: 500;
    flex-grow: 1;
}

.research-list .vuln-links {
    flex-shrink: 0;
    text-align: right;
    white-space: nowrap;
}

.research-list .vuln-links a,
.research-list .vuln-links span {
    margin-left: 8px;
    font-size: 0.9rem;
}

.site-footer {
    background-color: var(--accent-bg-color);
    border-top: 1px solid var(--border-color);
    color: var(--muted-color);
    text-align: center;
    padding: 2rem 0;
    margin-top: auto;
    font-size: 0.9rem;
}

.site-footer p {
    margin: 0;
}

@media (max-width: 768px) {
    .site-header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .site-nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0 10px;
    }

    .site-nav li {
        margin-left: 0;
    }

    .bio-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .bio-grid img {
        margin: 0 auto 1.5rem;
        max-width: 180px;
    }

    .research-list li {
        flex-direction: column;
        align-items: flex-start;
    }

    .research-list .vuln-links {
        text-align: left;
        margin-top: 0.5rem;
        white-space: normal;
    }

    .research-list .vuln-links a,
    .research-list .vuln-links span {
        margin-left: 0;
        margin-right: 8px;
    }
}