@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600&family=Playfair+Display:wght@500;600&display=swap');

/* ─── Variables ─────────────────────────────────────────── */
:root {
    --navy:       #1c2b5e;
    --navy-hover: #243470;
    --text:       #1a1a2e;
    --muted:      #5a5a72;
    --link:       #1c2b5e;
    --max-w:      1200px;
    --pad:        2rem;
    --col-left:   220px;   /* unified left column — photo width = section label width */
    --col-gap:    3rem;    /* unified gap — keeps bio and paper text left-aligned */
}

/* ─── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Outfit', sans-serif;
    font-weight: 400;
    color: var(--text);
    background: #fff;
    line-height: 1.6;
}

a { color: var(--link); text-decoration: underline; }
a:hover { color: var(--navy-hover); }

/* ─── Navigation ────────────────────────────────────────── */
nav {
    background: var(--navy);
    padding: 0 var(--pad);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 68px;
}

.nav-brand {
    color: #fff;
    text-decoration: none;
    font-family: 'Outfit', sans-serif;
    font-weight: 500;
    font-size: 1.2rem;
    letter-spacing: 0.01em;
}
.nav-brand:hover { color: rgba(255,255,255,0.85); }

.nav-links { display: flex; gap: 2rem; }
.nav-links a {
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 400;
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
}
.nav-links a:hover,
.nav-links a.active {
    color: #fff;
    border-bottom-color: rgba(255,255,255,0.5);
}

/* ─── Hero wrapper — full-width tinted background ───────── */
.hero-wrapper {
    background: #eef2f8;
    padding: 3rem 0;
}

/* ─── Hero content ──────────────────────────────────────── */
.hero {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 var(--pad);
    display: flex;
    gap: var(--col-gap);
    align-items: flex-start;
}

.hero-photo {
    flex: 0 0 var(--col-left);
}
.hero-photo img {
    width: var(--col-left);
    height: auto;
    display: block;
    border: 3px solid var(--navy);
    box-shadow: 0 4px 18px rgba(28, 43, 94, 0.18);
}
.hero-email {
    margin-top: 0.65rem;
    font-size: 0.875rem;
}
.hero-email a { color: var(--link); }

.hero-info {
    flex: 1;
    padding-top: 0.2rem;
}
.hero-info h1 {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 0.5rem;
    color: var(--text);
}
.hero-info .title-block { margin-bottom: 1.25rem; }
.hero-info .title-line {
    font-size: 0.975rem;
    font-weight: 400;
    color: var(--text);
    line-height: 1.55;
}
.hero-info .bio {
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--text);
}

/* ─── Sections (Publications, Working Papers, Notes) ─────── */
.section-row {
    max-width: var(--max-w);
    margin: 3rem auto 0;
    padding: 0 var(--pad);
    display: flex;
    gap: var(--col-gap);
    align-items: flex-start;
}

.section-label {
    flex: 0 0 var(--col-left);
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    font-weight: 500;
    line-height: 1.3;
    color: var(--text);
    padding-top: 0.1rem;
}

.papers-list { flex: 1; }

/* ─── Paper entries ─────────────────────────────────────── */
.paper {
    margin-bottom: 1.75rem;
    padding: 0.6rem 0.75rem;
    border-radius: 6px;
    margin-left: -0.75rem;
    transition: background 0.15s;
}
.paper:last-child { margin-bottom: 0; }
.paper:hover { background: #f0f4fb; }

.paper-title {
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 0.15rem;
}
.paper-authors {
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 0.1rem;
}
.paper-info {
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 0.35rem;
}
.paper-links {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 0.35rem;
}
.paper-links a {
    font-size: 0.875rem;
    color: var(--link);
    text-decoration: underline;
}

/* ─── Abstract toggle ───────────────────────────────────── */
.abstract-details {
    margin-top: 0.3rem;
}
.abstract-details summary {
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--navy);
    list-style: none;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    user-select: none;
}
.abstract-details summary::-webkit-details-marker { display: none; }
.abstract-details summary::before {
    content: '▶';
    font-size: 0.6rem;
    display: inline-block;
    transition: transform 0.15s;
}
.abstract-details[open] summary::before {
    transform: rotate(90deg);
}
.abstract-text {
    margin-top: 0.6rem;
    font-size: 0.9rem;
    line-height: 1.75;
    color: #333;
    border-left: 3px solid #c8d3ee;
    padding-left: 0.9rem;
}

/* ─── Page bottom padding ───────────────────────────────── */
.page-end { height: 4rem; }

/* ─── Research page top padding ────────────────────────── */
.research-top { margin-top: 3.5rem; }

/* ─── Responsive ────────────────────────────────────────── */
@media (max-width: 720px) {
    .hero-wrapper { padding: 2rem var(--pad); }
    .hero { flex-direction: column; gap: 1.5rem; }
    .hero-photo { flex: unset; width: fit-content; }
    .hero-photo img { width: 160px; }
    .section-row { flex-direction: column; gap: 0.75rem; }
    .section-label { flex: unset; font-size: 1.6rem; }
    .paper { margin-left: 0; }
}