/* =============================================================
   NAV — sticky section navigation
   ============================================================= */

#site-nav {
    position: sticky;
    top: 0;
    background: white;
    border-bottom: 1px solid #e0e0e0;
    padding: 12px 24px;
    z-index: 100;
    display: flex;
    justify-content: flex-start;
    align-items: center;
}

#site-nav a {
    margin: 0 10px;
    font-family: 'Ubuntu', monospace;
    font-size: 14px;
    font-weight: normal;
    color: #4a6741;
}

#site-nav a:hover {
    text-decoration: underline;
}

#site-nav .nav-divider {
    margin: 0 10px;
    color: #ccc;
    font-size: 14px;
}

.nav-group {
    display: inline-flex;
    align-items: center;
}

.nav-collapse {
    display: inline-flex;
    max-width: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-width 0.4s ease 3s, opacity 0.25s ease 3s;
    white-space: nowrap;
}

.nav-group:hover .nav-collapse {
    max-width: 700px;
    opacity: 1;
    transition: max-width 0.4s ease, opacity 0.25s ease;
}

/* =============================================================
   1. BASE — links, body, typography
   ============================================================= */

html {
    scroll-behavior: smooth;
}

body {
    background-color: white;
    line-height: 1.2;
}

#main-content {
    max-width: 960px;
    margin: 0 auto;
    padding: 0;
}

#page-footer {
    max-width: 100%;
    padding: 20px;
    text-align: right;
}

.footer-credit {
    font-size: 12px;
}

a {
    color: #4a6741;
    text-decoration: none;
}

a:focus,
a:hover {
    color: #4a6741;
    text-decoration: none;
}

body,
p,
a {
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 14px;
}

strong {
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 14px;
}

/* =============================================================
   2. CUSTOM ELEMENTS — <name>, <heading>, <papertitle>
   ============================================================= */

h1.name, h2.heading, h3.papertitle {
    margin: 0;
    padding: 0;
}

h1.name {
    font-family: 'Ubuntu', monospace;
    font-size: 32px;
    font-weight: normal;
}

h2.heading {
    font-family: 'Ubuntu', monospace;
    font-size: 22px;
    font-weight: normal;
    color: #4a6741;
    display: inline;
}

h3.papertitle {
    font-family: 'Ubuntu', monospace;
    font-size: 14px;
    font-weight: 700;
    display: inline;
}

/* =============================================================
   3. IMAGE EFFECTS — .one, .two, .fade (paper thumbnails)
   ============================================================= */

.one {
    width: 160px;
    height: 160px;
    position: relative;
}

.two {
    width: 160px;
    height: 160px;
    position: absolute;
    transition: opacity .2s ease-in-out;
}

.fade {
    transition: opacity .2s ease-in-out;
}

/* =============================================================
   4. SELECTED PAPERS — accent on highlighted publications
   ============================================================= */

.entry-row.paper-selected {
    background-color: #f2f5f1;
    border-radius: 6px;
    padding: 10px;
}

.entry-row + .entry-row {
    margin-top: 8px;
}

/* =============================================================
   5. UTILITIES — .highlight, .new badge
   ============================================================= */

span.highlight {
    background-color: #ffffd0;
}

/* =============================================================
   6. LAYOUT — grid-based section layout (replaces tables)
   ============================================================= */

.section {
    padding: 20px;
}

.section-heading {
    padding: 0 0 10px 0;
    cursor: pointer;
    list-style: none;
}

.section-heading::-webkit-details-marker {
    display: none;
}

.section-heading .heading::before {
    content: '− ';
    font-size: 16px;
    color: #4a6741;
}

details.section:not([open]) .section-heading .heading::before {
    content: '+ ';
}

.pub-filter {
    font-family: 'Ubuntu', monospace;
    font-size: 14px;
    margin-left: 12px;
}

.pub-filter-option {
    cursor: pointer;
    color: #999;
}

.pub-filter-option.active {
    color: #4a6741;
    font-weight: 700;
}

.pub-filter-option:hover {
    text-decoration: underline;
}

.pub-filter-sep {
    color: #ccc;
    margin: 0 4px;
}

.entry-row:not(.paper-selected):hover {
    background-color: #fafafa;
    border-radius: 6px;
}

.logo-rounded {
    border-radius: 6px;
}

.entry-row {
    display: grid;
    grid-template-columns: 30% 1fr;
    gap: 0 20px;
    padding: 20px 0;
    align-items: start;
}

.section-narrow-img .entry-row {
    grid-template-columns: 25% 1fr;
}

.entry-img {
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: center;
    padding: 4px;
}

.entry-img img {
    width: 100%;
    height: auto;
    object-fit: contain;
}

.entry-row.paper-selected .entry-img {
    padding-left: 6px;
}

.entry-row.paper-selected .entry-body {
    padding-right: 6px;
}

.entry-body {
    padding-top: 0;
}

.about-row {
    display: grid;
    grid-template-columns: 70% 1fr;
    gap: 0 20px;
    padding: 20px;
}

.about-photo {
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.about-photo img {
    width: 70%;
    border-radius: 6px;
    margin-top: 60px;
}

.logo-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 4px;
}

.logo-row img {
    width: 48px;
}

.logo-row.logo-main {
    margin-bottom: 8px;
}

.logo-row.logo-main img {
    width: 140px;
}

/* =============================================================
   7. RESPONSIVE — mobile breakpoints
   ============================================================= */

@media (max-width: 768px) {
    #main-content {
        padding: 0 12px;
    }

    .about-row {
        grid-template-columns: 1fr;
        padding: 12px;
    }

    .about-photo {
        order: -1;
        margin-bottom: 16px;
    }

    .about-photo img {
        width: 40%;
        margin-top: 0;
    }

    .entry-row {
        grid-template-columns: 1fr;
        gap: 12px 0;
    }

    .entry-img {
        justify-content: center;
    }

    .entry-img img {
        width: 50%;
        max-width: 200px;
    }

    .logo-row img {
        min-width: 28px;
    }

    #site-nav {
        flex-wrap: wrap;
        padding: 8px 4px;
    }

    #site-nav a {
        margin: 2px 6px;
        font-size: 13px;
    }

    .nav-collapse {
        max-width: 700px;
        opacity: 1;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 12px 0;
    }

    .about-photo img {
        width: 50%;
    }

    .entry-img img {
        width: 70%;
    }

    h1.name {
        font-size: 26px;
    }

    h2.heading {
        font-size: 18px;
    }
}