:root {
    --bg: #f9f9f7;
    --surface: #ffffff;
    --ink: #21272e;
    --muted: #5c6670;
    --faint: #8a929b;
    --accent: #38596e;
    --line: #e4e5e1;
    --serif: 'IBM Plex Serif', Georgia, serif;
    --sans: 'IBM Plex Sans', -apple-system, sans-serif;
    --mono: 'IBM Plex Mono', 'Courier New', monospace;
}

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

@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; }
}

body {
    font-family: var(--sans);
    font-size: 1.0625rem;
    line-height: 1.65;
    color: var(--ink);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 2px;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Nav ---------- */
.nav {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(249, 249, 247, 0.92);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
}
.nav-inner {
    max-width: 760px;
    margin: 0 auto;
    padding: 0.9rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
}
.nav-name {
    font-family: var(--serif);
    font-weight: 600;
    font-size: 1rem;
    color: var(--ink);
}
.nav-name:hover { text-decoration: none; }
.nav-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.4rem 1.4rem;
    list-style: none;
    font-family: var(--mono);
    font-size: 0.78rem;
}
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a[aria-current="page"] {
    color: var(--ink);
    border-bottom: 1px solid var(--accent);
    padding-bottom: 2px;
}

/* ---------- Hero: paper title block (home) ---------- */
.hero { padding: 5.5rem 0 4.5rem; }
.meta-line {
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--faint);
    margin-bottom: 1.4rem;
}
.hero h1 {
    font-family: var(--serif);
    font-weight: 600;
    font-size: clamp(2.4rem, 6vw, 3.4rem);
    line-height: 1.12;
    letter-spacing: -0.01em;
    margin-bottom: 1.4rem;
}
.hero .statement {
    font-family: var(--serif);
    font-size: 1.2rem;
    line-height: 1.6;
    color: var(--muted);
    max-width: 38rem;
    margin-bottom: 1.6rem;
}
.hero .affiliation {
    font-size: 0.95rem;
    color: var(--muted);
    margin-bottom: 2.2rem;
}
.hero .affiliation strong { color: var(--ink); font-weight: 500; }
.hero-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem 1.8rem;
    font-family: var(--mono);
    font-size: 0.82rem;
}
.hero-links a { border-bottom: 1px solid var(--line); padding-bottom: 2px; }
.hero-links a:hover { border-color: var(--accent); text-decoration: none; }

/* ---------- Page header (subpages) ---------- */
.page-header { padding: 4rem 0 0.5rem; }
.page-header h1 {
    font-family: var(--serif);
    font-weight: 600;
    font-size: clamp(1.8rem, 4vw, 2.3rem);
    line-height: 1.15;
    letter-spacing: -0.01em;
}

/* ---------- Sections ---------- */
section { padding: 3.2rem 0; }
section + section { border-top: 1px solid var(--line); }
.eyebrow {
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--faint);
    margin-bottom: 1.8rem;
}

.prose p { margin-bottom: 1rem; max-width: 42rem; }
.prose p:last-child { margin-bottom: 0; }

/* About with photo */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 150px;
    gap: 2.5rem;
    align-items: start;
}
.about-grid img {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: 6px;
    filter: grayscale(15%);
}
@media (max-width: 620px) {
    .about-grid { grid-template-columns: 1fr; }
    .about-grid img { order: -1; }
}

/* Timeline entries (education, experience, projects) */
.entry {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 1.6rem;
    padding: 1.4rem 0;
}
.entry + .entry { border-top: 1px solid var(--line); }
.entry-date {
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--faint);
    padding-top: 0.3rem;
}
.entry h3 {
    font-family: var(--serif);
    font-weight: 600;
    font-size: 1.15rem;
    margin-bottom: 0.15rem;
}
.entry .org { font-size: 0.92rem; color: var(--muted); margin-bottom: 0.6rem; }
.entry .detail { font-size: 0.95rem; color: var(--ink); max-width: 38rem; }
.entry .detail em { color: var(--muted); }
@media (max-width: 620px) {
    .entry { grid-template-columns: 1fr; gap: 0.4rem; }
}

/* Research interests */
.interest-list { list-style: none; max-width: 42rem; }
.interest-list li {
    padding: 0.9rem 0;
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 1.2rem;
}
.interest-list li + li { border-top: 1px solid var(--line); }
.interest-list .term {
    font-family: var(--serif);
    font-weight: 600;
    font-size: 1rem;
}
.interest-list .desc { font-size: 0.95rem; color: var(--muted); }
@media (max-width: 620px) {
    .interest-list li { grid-template-columns: 1fr; gap: 0.2rem; }
}

/* Contact */
.contact-list { list-style: none; }
.contact-list li {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 1.6rem;
    padding: 0.55rem 0;
    font-size: 0.97rem;
}
.contact-list .k {
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--faint);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding-top: 0.2rem;
}
@media (max-width: 620px) {
    .contact-list li { grid-template-columns: 1fr; gap: 0.1rem; }
}
.contact-note {
    margin-top: 1.6rem;
    font-size: 0.95rem;
    color: var(--muted);
    max-width: 40rem;
}

/* Footer */
footer {
    border-top: 1px solid var(--line);
    padding: 2rem 0 3rem;
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--faint);
}