/* Palette / type, in the spirit of otto-b.info: warm beige background,
   black text, plain Helvetica, bordered tables, no link underlines. */
:root {
    --bg: #FFFFFF;
    --fg: #111111;
    --border: #111111;
    --accent: #386641;
    --link: #0645ad;
}

body {
    max-width: 760px;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
    background: var(--bg);
    color: var(--fg);
    font-family: Helvetica, Arial, sans-serif;
    line-height: 1.55;
}

h1, h2, h3 {
    letter-spacing: .03rem;
}

h2 {
    border-bottom: 1px solid var(--border);
    padding-bottom: .3rem;
    margin-top: 2.5rem;
}

a, a:visited, a:hover, a:active {
    color: var(--link);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

/* header / nav */
header {
    text-align: center;
    margin-bottom: 2rem;
}
header h1 {
    margin: 0;
    font-size: 1.4rem;
}
header h1 a {
    letter-spacing: .05rem;
}
header nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 1.25rem;
    list-style: none;
    margin: 1rem 0 0;
    padding: .6rem 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
header nav a,
header nav a:visited,
header nav a:hover,
header nav a:active {
    color: var(--fg);
    letter-spacing: .03rem;
}

footer {
    text-align: center;
    border-top: 1px solid var(--border);
    margin-top: 3rem;
    padding-top: 1rem;
    font-size: .85rem;
}

footer img.license-icon {
    height: 1em;
    width: auto;
    vertical-align: text-bottom;
}

.text-center { text-align: center; }

/* bordered tables, used for publications / projects listings */
table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0 2rem;
}
th, td {
    border: 1px solid var(--border);
    padding: .5rem .75rem;
    text-align: left;
    vertical-align: top;
    font-size: .95rem;
}
th {
    font-weight: bold;
    background: rgba(0, 0, 0, .05);
}

/* intro layout: picture/card on left, first paragraphs on right */
.intro-flex {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 1rem;
}
.intro-flex .people-grid {
    flex: 0 0 auto;
}
.intro-text {
    flex: 1 1 300px;
    min-width: 250px;
}

/* people grid */
.people-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
}
.person-card {
    text-align: center;
    width: 100%;
    max-width: 300px;
}
.person-card table {
    white-space: normal;
}
.person-card th,
.person-card td {
    padding: .3rem .35rem;
    font-size: .75rem;
}
.person-card .person-email {
    font-size: .85rem;
    white-space: nowrap;
}
.person-card > img {
    width: 100%;
    max-width: 220px;
    border: 2px solid var(--border);
    border-radius: 50%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    margin-bottom: 0.75rem;
}

/* group members: 3-column grid, wraps as more people are added */
.group-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    justify-items: center;
}
@media (max-width: 700px) {
    .group-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .group-grid { grid-template-columns: 1fr; }
}

/* photo gallery */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}
@media (max-width: 600px) {
    .photo-grid { grid-template-columns: 1fr; }
}
.photo-grid img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border: 1px solid var(--border);
    cursor: pointer;
}

#lightbox-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    z-index: 10;
    align-items: center;
    justify-content: center;
}
#lightbox-overlay.open { display: flex; }
#lightbox-overlay img {
    max-width: 90vw;
    max-height: 90vh;
    border: 4px solid var(--bg);
}
#lightbox-overlay .lightbox-close {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    color: white;
    font-size: 2rem;
    cursor: pointer;
}