:root {
    --bg: #ffffff;
    --surface: #ffffff;
    --surface-alt: #fcfcfc;
    --text: #1f1f1f;
    --muted: #5e5e5e;
    --border: #e8e8e8;
    --primary: #1f1f1f;
    --accent: #4a4a4a;
    --shadow: none;
    --radius-lg: 6px;
    --radius-md: 0px;
    --radius-sm: 0px;
    --max-width: 960px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    letter-spacing: -0.015em;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

h1, h2, h3, p, ul { margin-top: 0; }
h1, h2, h3 { font-weight: 500; line-height: 1.2; letter-spacing: -0.02em; color: var(--text); }
h1 { font-size: clamp(3.5rem, 7vw, 6rem); line-height: 0.85; margin-bottom: 2rem; letter-spacing: -0.06em; font-weight: 700; max-width: 10ch; }
h2 { font-size: clamp(1.75rem, 2.5vw, 2.1rem); margin-bottom: 1.25rem; }
h3 { font-size: 1.3rem; margin-bottom: 1rem; }
p { margin-bottom: 0; }

.eyebrow {
    margin: 0 0 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--accent);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(16px);
    background: rgba(246, 248, 251, 0.88);
    border-bottom: 1px solid rgba(20, 32, 51, 0.08);
}

.nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo { font-weight: 800; font-size: 1.05rem; letter-spacing: 0.02em; }
.logo span { color: var(--primary); }

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
    color: var(--muted);
    font-size: 0.96rem;
}

.nav-links a {
    transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible { color: var(--text); }

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1.5rem 5rem;
}

.hero {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 3rem;
    align-items: start;
    padding: 4rem 0 2rem;
}

.hero-copy { padding: 0; }

.pi {
    border: 0;
    padding: 0;
    margin: 1rem 0 2rem;
    font-size: 1.2rem;
    line-height: 1.45;
    color: var(--text);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.hero-panel {
    padding: 2.5rem;
    display: grid;
    gap: 1.5rem;
    align-content: start;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    font-size: 0.9rem;
}

.hero-stat {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(20, 32, 51, 0.08);
}
.hero-stat:last-child { border-bottom: 0; }
.stat-label { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 0.5rem; }
.hero-stat strong { display: block; line-height: 1.3; font-size: 1rem; }

.btn {
    height: 48px;
    padding: 0 1.75rem;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    border: 1px solid var(--text);
    background: transparent;
}
.btn-primary { background: #1f1f1f; color: #ffffff; }
.btn-primary:hover { background: #333333; }
.btn-secondary { border-color: var(--border); color: var(--text); }
.btn-secondary:hover { background: #fcfcfc; border-color: #1f1f1f; }

.section { padding: 3.25rem 0; }
.section-heading { max-width: 760px; margin-bottom: 1.75rem; }
.section-heading p:last-child {
    max-width: 62ch;
    line-height: 1.7;
    color: var(--muted);
}

.highlight-band {
    margin: 4rem 0;
    padding: 3rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 3rem;
    border: 1px solid var(--border);
    background: #f8f9fa;
}

.highlight-label { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 0.5rem; }
.highlight-item strong { display: block; line-height: 1.4; }

.research-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; }

.card {
    padding: 2.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.card p { color: var(--muted); }

.split-section {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
    gap: 1.25rem;
    align-items: start;
}

.publication-list { margin: 0; padding-left: 1.1rem; list-style: none; }
.publication-list li { margin-bottom: 1.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border); }
.publication-list li:last-child { margin-bottom: 0; padding-bottom: 0; border-bottom: 0; }

.project-list { display: grid; gap: 1rem; }
.project-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(240px, 0.8fr);
    gap: 1.25rem;
    align-items: start;
    border-top: 1px solid var(--border);
    padding: 2rem 0;
}
.project-type {
    margin-bottom: 0.35rem;
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary);
}

.team-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.team-group {
    padding: 1.5rem;
    border: 1px solid var(--border);
    background: var(--surface-alt);
}

.team-group h3 { font-size: 0.95rem; margin-bottom: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.member-names { line-height: 1.5; font-size: 1rem; color: var(--text); }

.contact-section {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
    gap: 1.25rem;
    align-items: stretch;
}
.contact-card { padding: 2.5rem; border: 1px solid var(--border); background: var(--surface); }

.site-footer { text-align: center; padding: 1.5rem; color: var(--muted); font-size: 0.92rem; }

@media (max-width: 980px) {
    .hero,
    .split-section,
    .contact-section,
    .project-item,
    .highlight-band {
        grid-template-columns: 1fr;
    }

    .hero {
        gap: 2rem;
    }

    .hero-panel {
        padding: 2rem;
    }

    .research-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
    .nav {
        flex-direction: column;
        align-items: flex-start;
        padding: 1.1rem 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        gap: 0.75rem 1rem;
        font-size: 0.92rem;
    }

    main { padding: 1.5rem 1rem 4rem; }

    .hero {
        padding: 2.5rem 0 1.25rem;
        gap: 1.5rem;
    }

    h1 {
        font-size: clamp(2.5rem, 14vw, 3.6rem);
        line-height: 0.95;
        max-width: none;
    }

    .pi {
        font-size: 1.05rem;
        margin-bottom: 1.5rem;
    }

    .hero-panel,
    .highlight-band,
    .card,
    .contact-card,
    .team-group {
        padding: 1.5rem;
    }

    .section {
        padding: 2.25rem 0;
    }

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

    .project-item {
        gap: 0.75rem;
        padding: 1.5rem 0;
    }

    .team-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}