/* research.nikwall.de
   One typeface (Roboto, light by default), the arq palette, light background and dark text throughout.
   Layout: a compact intro (person left, about and profiles right), then the research as topic clusters
   with four cards per row, then a two-column background list. Every paper has its own page. */

:root {
  /* arq palette (arq manual) */
  --green: #135b49;
  --sage: #9dc09f;
  --crimson: #bb2649;
  --ink: #2f3639;
  --green-2: #91a596;
  --sage-2: #d7e1d2;
  --rose-2: #d79ba5;
  --grey-2: #9ba0a5;
  --yellow: #faf09b;
  --tint: #f1f5f0;
  --white: #ffffff;
  /* derived from ink for small text, so it stays readable on white */
  --muted: #5b6366;

  --font: "Roboto", "Segoe UI", system-ui, -apple-system, sans-serif;
  --wrap: 82rem;
  --gutter: max(1.25rem, env(safe-area-inset-left));
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 4rem; }
body { margin: 0; background: var(--white); color: var(--ink); font-family: var(--font); font-weight: 300; font-size: 1rem; line-height: 1.55; }
[hidden] { display: none !important; }
a { color: var(--green); text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { color: var(--crimson); }
:focus-visible { outline: 2px solid var(--crimson); outline-offset: 2px; border-radius: 2px; }
h1, h2, h3, p { margin: 0; }
b, strong { font-weight: 500; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: var(--gutter); }

/* top bar */
.bar { position: sticky; top: 0; z-index: 10; background: var(--white); border-bottom: 1px solid var(--sage-2); }
.bar-in { max-width: var(--wrap); margin: 0 auto; padding: 0.6rem var(--gutter); display: flex; justify-content: space-between; align-items: center; gap: 0.5rem 1rem; flex-wrap: wrap; }
.brand { font-weight: 500; color: var(--ink); text-decoration: none; }
.bar nav { display: flex; gap: 1.4rem; font-size: 0.92rem; font-weight: 400; }
.bar nav a { color: var(--muted); text-decoration: none; }
.bar nav a:hover { color: var(--green); }

/* intro: person on the left, about and profiles on the right */
.intro { border-bottom: 1px solid var(--sage-2); }
.intro-in { max-width: var(--wrap); margin: 0 auto; padding: 1.6rem var(--gutter) 1.4rem; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 1.1rem 3.5rem; align-items: start; }
.id { display: flex; align-items: center; gap: 1.25rem; }
.portrait { width: 5.25rem; height: 5.25rem; border-radius: 50%; object-fit: cover; border: 2px solid var(--sage); flex: none; }
.portrait.mono { display: grid; place-items: center; background: var(--tint); color: var(--green); font-size: 1.7rem; letter-spacing: 0.04em; }
.intro h1 { font-size: clamp(2rem, 3.6vw, 2.75rem); font-weight: 300; line-height: 1.05; letter-spacing: -0.02em; }
.tagline { margin-top: 0.3rem; font-size: 1.05rem; color: var(--muted); }
.facts { grid-column: 1; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 1.25rem; padding-top: 0.85rem; border-top: 1px solid var(--sage-2); }
.facts dt { font-size: 0.68rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--green); }
.facts dd { margin: 0.15rem 0 0; font-size: 0.92rem; font-weight: 400; line-height: 1.35; }
.intro-side { grid-column: 2; grid-row: 1 / span 2; display: grid; gap: 0.9rem; align-content: center; height: 100%; }
.about { font-size: 0.95rem; }
.profiles { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.4rem; }
.profiles li { display: flex; align-items: center; gap: 0.25rem; }
.pbtn { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.28rem 0.7rem 0.28rem 0.55rem; border: 1px solid var(--sage-2); border-radius: 99px; color: var(--green); background: var(--white); text-decoration: none; font-size: 0.82rem; font-weight: 400; transition: background 0.15s, border-color 0.15s; }
a.pbtn:hover { border-color: var(--green); background: var(--tint); color: var(--green); }
.pbtn.off { color: var(--grey-2); }
.ico { width: 1rem; height: 1rem; flex: none; }

/* research */
.research { padding: 1.4rem 0 2.25rem; }
.sec-head { display: flex; justify-content: space-between; align-items: center; gap: 0.6rem 2rem; flex-wrap: wrap; margin-bottom: 0.4rem; }
.sec-head h2 { font-size: 1.6rem; font-weight: 300; letter-spacing: -0.01em; }
.filters { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.filters button { font: inherit; font-size: 0.8rem; font-weight: 400; color: var(--ink); background: var(--white); border: 1px solid var(--sage-2); border-radius: 99px; padding: 0.22rem 0.7rem; cursor: pointer; }
.filters button span { color: var(--grey-2); margin-left: 0.1rem; font-variant-numeric: tabular-nums; }
.filters button:hover { border-color: var(--green); }
.filters button[aria-pressed="true"] { background: var(--tint); border-color: var(--green); color: var(--green); font-weight: 500; }

.cluster { margin-top: 1.1rem; }
.cluster-head { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.2rem 0.9rem; padding-bottom: 0.4rem; margin-bottom: 0.75rem; border-bottom: 2px solid var(--green); }
.accent-1 .cluster-head { border-bottom-color: var(--sage); }
.accent-2 .cluster-head { border-bottom-color: var(--crimson); }
.accent-3 .cluster-head { border-bottom-color: var(--green-2); }
.cluster-head h3 { font-size: 1.1rem; font-weight: 500; }
.cluster-head p { font-size: 0.88rem; color: var(--muted); }
.cluster-head .count { margin-left: auto; font-size: 0.8rem; color: var(--grey-2); font-variant-numeric: tabular-nums; }

.cards { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.9rem; }
.card a { display: flex; flex-direction: column; height: 100%; background: var(--white); border: 1px solid var(--sage-2); border-radius: 6px; overflow: hidden; color: var(--ink); text-decoration: none; transition: border-color 0.15s, box-shadow 0.15s; }
.card a:hover { border-color: var(--green); box-shadow: 0 6px 18px -12px rgba(19, 91, 73, 0.5); color: var(--ink); }
.card-vis { position: relative; aspect-ratio: 5 / 2; background: var(--tint); border-bottom: 1px solid var(--sage-2); }
.card-vis svg, .card-vis img { display: block; width: 100%; height: 100%; object-fit: cover; }
.soon { position: absolute; left: 0.45rem; bottom: 0.45rem; background: var(--white); color: var(--muted); font-size: 0.65rem; font-weight: 400; padding: 0 0.4rem; border-radius: 3px; }
.card-body { padding: 0.7rem 0.85rem 0.85rem; display: flex; flex-direction: column; gap: 0.3rem; flex: 1; }
.kicker { display: flex; flex-wrap: wrap; gap: 0.25rem 0.7rem; align-items: center; font-size: 0.66rem; font-weight: 500; letter-spacing: 0.09em; text-transform: uppercase; color: var(--green); }
.kicker span + span { color: var(--grey-2); }
.kicker .theme { color: var(--crimson); }
.flag { color: var(--crimson) !important; border: 1px solid var(--rose-2); border-radius: 3px; padding: 0 0.3rem; }
.card h3 { font-size: 0.98rem; font-weight: 400; line-height: 1.28; }
.card a:hover h3 { color: var(--green); }
.card .meta { font-size: 0.76rem; color: var(--muted); line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 2; line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card .sum { font-size: 0.82rem; line-height: 1.45; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 3; line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* background: two columns of stations */
.background { padding: 1.4rem 0 2.25rem; border-top: 1px solid var(--sage-2); }
.background .sec-head { margin-bottom: 0.9rem; }
.timeline { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.55rem 3rem; }
.timeline li { display: grid; grid-template-columns: 4.5rem minmax(0, 1fr); gap: 0.75rem; font-size: 0.93rem; }
.yrs { font-weight: 400; color: var(--green); font-variant-numeric: tabular-nums; }

/* footer */
.foot { border-top: 1px solid var(--sage-2); background: var(--tint); }
.foot-in { max-width: var(--wrap); margin: 0 auto; padding: 1.25rem var(--gutter) 1.5rem; display: flex; justify-content: space-between; align-items: center; gap: 0.75rem 3rem; flex-wrap: wrap; font-size: 0.9rem; }
.foot-in > div:first-child { display: flex; gap: 0.5rem 1.25rem; flex-wrap: wrap; align-items: baseline; }
.foot-name { font-weight: 500; }
.foot-links { display: flex; gap: 0.5rem 1.25rem; flex-wrap: wrap; color: var(--muted); }

/* paper page */
.paper { max-width: 56rem; margin: 0 auto; padding: 1.25rem var(--gutter) 2.5rem; display: grid; gap: 1.75rem; }
.back { font-size: 0.88rem; font-weight: 400; text-decoration: none; }
.back::before { content: "← "; }
.paper-head { display: grid; gap: 0.65rem; }
.paper h1 { font-size: clamp(1.7rem, 3.6vw, 2.4rem); font-weight: 300; line-height: 1.15; letter-spacing: -0.015em; text-wrap: balance; }
.authors { font-size: 1rem; }
.role-note, .venue, .also { color: var(--muted); }
.also { font-size: 0.88rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.25rem; }
.btn { font: inherit; font-size: 0.88rem; font-weight: 400; display: inline-flex; align-items: center; padding: 0.4rem 0.9rem; border-radius: 4px; border: 1px solid var(--sage-2); color: var(--green); background: var(--white); text-decoration: none; cursor: pointer; }
.btn:hover { border-color: var(--green); background: var(--tint); color: var(--green); }
.btn.primary { border-color: var(--green); background: var(--tint); font-weight: 500; }
.btn.primary:hover { background: var(--sage-2); }

.media { margin: 0; display: grid; gap: 0.5rem; }
.media img, .media video, .media iframe, .media .cover-art { display: block; width: 100%; border-radius: 6px; border: 1px solid var(--sage-2); background: var(--tint); }
.media .cover-art { aspect-ratio: 3 / 1; height: auto; }
.media.embed > svg.vis { display: block; width: 100%; height: auto; border-radius: 6px; border: 1px solid var(--sage-2); background: var(--tint); }
.media figcaption { font-size: 0.88rem; color: var(--muted); }
.block-text { max-width: 46rem; }

.paper section { display: grid; gap: 0.7rem; }
.paper h2 { font-size: 0.75rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--green); padding-bottom: 0.4rem; border-bottom: 1px solid var(--sage-2); }
.inshort p { font-size: 1.2rem; line-height: 1.45; }
.findings { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.55rem; }
.findings li { position: relative; padding-left: 1.4rem; }
.findings li::before { content: ""; position: absolute; left: 0; top: 0.55rem; width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--crimson); }
.findings li:nth-child(even)::before { background: var(--green); }
.quiet { color: var(--muted); }
.ref { font-size: 0.95rem; }
.bib pre { margin: 0; padding: 0.85rem 1rem; background: var(--tint); border: 1px solid var(--sage-2); border-radius: 6px; font-family: var(--font); font-weight: 400; font-size: 0.82rem; line-height: 1.5; white-space: pre-wrap; overflow-wrap: anywhere; }
.bib .btn { margin-top: 0.5rem; }
.prevnext { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; border-top: 1px solid var(--sage-2); padding-top: 1.1rem; }
.pn { display: grid; gap: 0.15rem; text-decoration: none; color: var(--ink); font-weight: 400; }
.pn span { font-size: 0.7rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--green); }
.pn.next { text-align: right; grid-column: 2; }

/* open points in draft builds (arq yellow is reserved for markings) */
mark.tbd { background: var(--yellow); color: var(--ink); font-size: 0.74rem; font-weight: 400; padding: 0.02rem 0.35rem; border-radius: 3px; }
.draft { position: relative; z-index: 11; background: var(--yellow); color: var(--ink); font-size: 0.82rem; padding: 0.4rem var(--gutter); }
.draft summary { cursor: pointer; font-weight: 500; }
.draft ul { margin: 0.4rem 0 0.2rem; padding-left: 1.2rem; columns: 2; column-gap: 2rem; }

@media (prefers-reduced-motion: reduce) {
  .card a, .pbtn { transition: none; }
}

@media (max-width: 1150px) {
  .cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .intro-in { grid-template-columns: minmax(0, 1fr); }
  .intro-side { grid-column: 1; grid-row: auto; }
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .timeline { grid-template-columns: minmax(0, 1fr); }
  .draft ul { columns: 1; }
}
@media (max-width: 560px) {
  .facts { grid-template-columns: minmax(0, 1fr); gap: 0.5rem; }
  .cards { grid-template-columns: minmax(0, 1fr); }
  .portrait { width: 4.25rem; height: 4.25rem; }
  .portrait.mono { font-size: 1.4rem; }
  .cluster-head .count { margin-left: 0; }
  .prevnext { grid-template-columns: minmax(0, 1fr); }
  .pn.next { grid-column: 1; text-align: left; }
}