/* ---------- tokens ---------- */
:root {
    --bg:          #f8f6f1;      /* warm off-white */
    --surface:     #fdfbf7;      /* slightly lighter card surface */
    --ink:         #1a1a1a;
    --ink-soft:    #4a4a4a;
    --muted:       #7a7368;
    --rule:        #e4ddd0;
    --accent:      #6b2a2e;      /* muted burgundy */
    --accent-hover:#8f3a3f;

    --serif:       "EB Garamond", "Iowan Old Style", "Apple Garamond", Georgia, serif;
    --sans:        "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

    --maxw:        1020px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img { max-width: 100%; height: auto; display: block; }

/* ---------- base ---------- */
body {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 17px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid rgba(107, 42, 46, 0.25);
    transition: color 0.15s ease, border-color 0.15s ease;
}
a:hover {
    color: var(--accent-hover);
    border-bottom-color: var(--accent-hover);
}

.sep {
    color: var(--muted);
    margin: 0 0.45em;
    user-select: none;
}

/* ---------- layout ---------- */
.page {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 72px 32px 96px;
}

/* ---------- hero ---------- */
.hero {
    display: grid;
    grid-template-columns: 1fr 230px;
    gap: 56px;
    align-items: start;
    margin-bottom: 80px;
}

.hero-text .name {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 44px;
    line-height: 1.1;
    margin: 0 0 20px 0;
    letter-spacing: -0.01em;
}

.bio {
    font-size: 17px;
    color: var(--ink-soft);
    margin: 0 0 16px 0;
    max-width: 60ch;
}

.contact {
    font-size: 15px;
    color: var(--muted);
    margin: 0 0 28px 0;
}
.contact a {
    color: var(--ink-soft);
    border-bottom-color: rgba(74, 74, 74, 0.3);
}
.contact a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.nav-btn {
    font-family: var(--sans);
    font-weight: 500;
    font-size: 14px;
    letter-spacing: 0.02em;
    padding: 9px 18px;
    border: 1px solid var(--rule);
    border-radius: 999px;
    background: var(--surface);
    color: var(--ink);
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.nav-btn:hover {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--bg);
}

.hero-photo {
    width: 230px;
}
.hero-photo img {
    width: 230px;
    height: 230px;
    object-fit: cover;
    border-radius: 4px;
    filter: grayscale(15%);
}

/* ---------- research ---------- */
.section-heading {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 28px;
    margin: 0 0 40px 0;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--rule);
    letter-spacing: 0.01em;
}

.paper {
    display: grid;
    grid-template-columns: 330px 1fr;
    gap: 36px;
    padding: 32px 0;
    border-bottom: 1px solid var(--rule);
}
.paper:last-child {
    border-bottom: none;
}

.paper-thumb img {
    width: 100%;
    border-radius: 3px;
    background: var(--surface);
    border: 1px solid var(--rule);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.paper-thumb a {
    display: block;
    border: none;
}
.paper-thumb a:hover img {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(26, 26, 26, 0.08);
}

.paper-title {
    font-family: var(--serif);
    font-weight: 600;
    font-size: 22px;
    line-height: 1.3;
    margin: 0 0 6px 0;
    letter-spacing: 0.005em;
}
.paper-title a {
    color: var(--ink);
    border-bottom: none;
}
.paper-title a:hover {
    color: var(--accent);
}

.paper-subtitle {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 400;
    font-size: 17px;
    color: var(--ink-soft);
    line-height: 1.35;
    margin: 0 0 6px 0;
}

.paper-authors {
    font-size: 15px;
    color: var(--muted);
    font-style: italic;
    margin: 0 0 10px 0;
}
.paper-authors a {
    color: var(--muted);
    border-bottom-color: rgba(122, 115, 104, 0.4);
    font-style: italic;
}
.paper-authors a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.paper-links {
    font-size: 14px;
    margin: 0 0 14px 0;
}

.paper-abstract {
    font-size: 15.5px;
    line-height: 1.65;
    color: var(--ink-soft);
    margin: 0;
}
.abs-label {
    font-weight: 600;
    color: var(--ink);
    font-style: italic;
}

/* ---------- footer ---------- */
.footer {
    margin-top: 80px;
    padding-top: 24px;
    border-top: 1px solid var(--rule);
    color: var(--muted);
    font-size: 14px;
    text-align: center;
}
.footer a {
    color: var(--muted);
    border-bottom-color: rgba(122, 115, 104, 0.4);
}
.footer a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* ---------- responsive ---------- */
@media (max-width: 720px) {
    .page {
        padding: 48px 22px 72px;
    }
    .hero {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .hero-photo {
        width: 140px;
        order: -1;
    }
    .hero-photo img {
        width: 140px;
        height: 140px;
    }
    .hero-text .name {
        font-size: 34px;
    }
    .paper {
        grid-template-columns: 1fr;
        gap: 18px;
    }
    .paper-thumb {
        max-width: 420px;
    }
    .section-heading {
        font-size: 24px;
    }
}