:root {
    --bg: #bcc8b4;
    --text: #1f251f;
    --muted: #495544;
    --line: #919e88;
    --soft: #aebaa6;
    --max: 1180px;
    --measure: 760px;
    --serif: "Libre Caslon Display", Georgia, "Times New Roman", serif;
    --sans: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

::selection {
    background: #e4eadf;
    color: #1f251f;
}

::-moz-selection {
    background: #e4eadf;
    color: #1f251f;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    line-height: 1.65;
}

a {
    color: inherit;
    text-decoration: none;
}

a:hover {
    color: #1f251f;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

.site-header, main, .site-footer {
    width: min(calc(100% - 40px), var(--max));
    margin-inline: auto;
}

main {
    padding-top: 46px;
}

.site-header {
    min-height: 74px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--line);
    gap: 22px;
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg);
}

.site-header::before {
    content: "";
    position: absolute;
    inset: 0 50%;
    width: 100vw;
    transform: translateX(-50%);
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    z-index: -1;
}

.site-title {
    font-family: var(--serif);
    font-size: 1.30rem;
    white-space: nowrap;
}

.nav {
    display: flex;
    align-items: center;
    gap: 7px;
    color: var(--muted);
    font-size: .82rem;
}

.nav a {
    display: inline-flex;
    align-items: center;
    border: 1px solid transparent;
    border-radius: 999px;
    padding: 7px 10px;
    line-height: 1.2;
    transition: .15s;
}

.nav a:hover {
    color: var(--text);
    border-color: var(--line);
    background: rgba(31, 37, 31, .045);
}

.nav a[aria-current="page"] {
    color: var(--text);
    border-color: #788570;
    background: rgba(255, 255, 255, .22);
}

.menu-button {
    display: none;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(31, 37, 31, .045);
    padding: 7px 10px;
}

.menu-button span {
    display: block;
    width: 20px;
    height: 1px;
    margin: 5px 0;
    background: var(--text);
}

.compact-title {
    padding: 4px 0 30px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 0;
}

.compact-title h1 {
    font-family: var(--serif);
    font-weight: 400;
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.05;
    margin: 7px 0 0;
}

.section-heading {
    padding-top: 4px;
}

.section-heading {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 25px;
    padding: 0 0 24px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 0;
}

.section-heading h2 {
    font-family: var(--serif);
    font-size: clamp(2.2rem, 4vw, 3.6rem);
    font-weight: 400;
    line-height: 1.05;
    margin: 8px 0 0;
}

.content-section {
    padding-bottom: 100px;
}

.prose {
    max-width: var(--measure);
    font-size: 1rem;
}

.prose p {
    margin: 0 0 1rem;
}

.prose a, .text-link {
    border-bottom: 1px solid #788570;
}

.download-link, .arxiv-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 6px 11px;
    color: var(--muted);
    font-size: .77rem;
    white-space: nowrap;
    transition: .15s;
}

.download-link:hover, .arxiv-link:hover {
    border-color: #74816c;
    color: var(--text);
    background: rgba(255, 255, 255, .18);
}

.home-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr);
    gap: 64px;
    align-items: start;
    padding-bottom: 28px;
}

.home-photo figure {
    margin: 0;
}

.home-photo img {
    width: 100%;
    background: var(--soft);
}

figcaption {
    margin-top: 12px;
    color: var(--muted);
    font-size: .85rem;
}

.contact-card {
    border-top: 1px solid var(--line);
    padding-top: 20px;
}

.contact-card h2 {
    font-family: var(--serif);
    font-weight: 400;
    font-size: 2.4rem;
    line-height: 1.08;
    margin: 0 0 18px;
}

.contact-card p {
    margin: 0 0 5px;
    color: #3f493c;
}

.contact-card .email {
    margin-bottom: 22px;
}

.last-update {
    margin-top: 25px;
    color: var(--muted);
    font-size: .78rem;
}


.research-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0 0 30px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 0;
}

.research-tabs a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 8px 14px;
    color: var(--muted);
    font-size: .82rem;
    line-height: 1.2;
    background: rgba(255, 255, 255, .12);
    transition: .15s;
}

.research-tabs a:hover,
.research-tabs a.current {
    color: var(--text);
    border-color: #74816c;
    background: rgba(255, 255, 255, .25);
}

.research-tabs + .content-section {
    padding-top: 0;
}

.publication-list {
    border-bottom: 1px solid var(--line);
}

.publication-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 24px;
    padding: 23px 0;
    border-top: 1px solid var(--line);
}

.publication-list .publication-item:first-child {
    border-top: 0;
}

.publication-authors {
    margin: 0 0 4px;
    color: var(--muted);
    font-size: .86rem;
}

.publication-title {
    font-family: var(--serif);
    font-weight: 400;
    font-size: 1.52rem;
    line-height: 1.15;
    margin: 0 0 7px;
}

.publication-citation {
    margin: 0;
    color: #495544;
    font-size: .91rem;
    max-width: 850px;
}

.notes-card {
    border-bottom: 1px solid var(--line);
}

.notes-card a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 25px;
    padding: 22px 0;
    border-top: 1px solid var(--line);
}

.notes-card h3 {
    font-family: var(--serif);
    font-weight: 400;
    font-size: 1.6rem;
    margin: 0;
}

.notes-card span {
    font-size: .85rem;
    color: var(--muted);
}

.year-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0 0 35px;
}

.year-strip a {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 7px 11px;
    color: var(--muted);
    font-size: .79rem;
    background: rgba(255, 255, 255, .12);
}

.year-strip a:hover, .year-strip a.current {
    color: var(--text);
    border-color: #74816c;
    background: rgba(255, 255, 255, .19);
}

.course-list {
    padding-bottom: 90px;
}

.course {
    display: grid;
    grid-template-columns: minmax(180px, .32fr) minmax(0, 1fr);
    gap: 36px;
    padding: 30px 0;
    border-top: 1px solid var(--line);
}

.course:first-child {
    border-top: 0;
}

.course h2 {
    font-family: var(--serif);
    font-weight: 400;
    font-size: 1.52rem;
    line-height: 1.15;
    margin: 0;
}

.course-body ul {
    margin: 0;
    padding-left: 20px;
}

.course-body li {
    margin: 0 0 9px;
}

.inline-links {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-left: 4px;
}

.sublist {
    margin-top: 8px!important;
}

.archive-list {
    border-bottom: 1px solid var(--line);
}

.archive-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 25px;
    padding: 18px 0;
    border-top: 1px solid var(--line);
    align-items: start;
}

.archive-item p {
    margin: 0;
}

.archive-actions {
    display: flex;
    gap: 7px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.polish-nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 38px;
}

.polish-nav a {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 7px 12px;
    color: var(--muted);
    font-size: .8rem;
    background: rgba(255, 255, 255, .12);
}

.polish-nav a.current {
    border-color: #74816c;
    color: var(--text);
}

.site-footer {
    padding: 22px 0 28px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: .78rem;
    display: flex;
    justify-content: space-between;
    gap: 25px;
    flex-wrap: wrap;
}


/* Compact section titles on Stuff in Polish → Dydaktyka. */
.dydaktyka-heading h2 {
    font-size: 1.52rem;
    line-height: 1.15;
    margin: 0;
}

.dydaktyka-heading-spaced {
    margin-top: 60px;
}

@media (max-width: 900px) {
    .home-grid {
        grid-template-columns: 1fr;
        gap: 42px;
    }
    .course {
        grid-template-columns: 1fr;
        gap: 14px;
    }
}

@media (max-width: 760px) {
    main {
        padding-top: 34px;
    }
    .site-header {
        position: sticky;
        top: 0;
    }
    .menu-button {
        display: block;
    }
    .nav {
        display: none;
        position: absolute;
        top: 73px;
        left: 0;
        right: 0;
        z-index: 20;
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
        padding: 20px 0;
        background: var(--bg);
        border-bottom: 1px solid var(--line);
    }
    .nav.open {
        display: flex;
    }
    .publication-item, .archive-item {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .archive-actions {
        justify-content: flex-start;
    }
    .publication-item .arxiv-link,
    .publication-item .download-link {
        justify-self: start;
    }
    .site-footer {
        flex-direction: column;
    }
    .home-grid {
        padding-bottom: 28px;
    }
    .content-section {
        padding-bottom: 75px;
    }
}