/* SmallSat Europe Research. Layout: slim navy bar, a quiet proceedings header with the search box,
   volumes, then a filter rail beside the paper list. A paper opens as its
   own page: article on the left, download and citation on the right. */
:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #151a2c;
  --muted: #5a6175;
  --rule: #e1e4eb;
  --link: #1f3a93;
  --band: #0e1631;
  --mark: #fff1a1;
  --mark-ink: #151a2c;
  --soft: #eef1f6;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Manrope", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0f1c; --surface: #121829; --ink: #e4e7ef; --muted: #9aa1b6; --rule: #232b42;
    --link: #a9b9ff; --band: #070b17; --mark: rgba(255, 230, 60, .28); --mark-ink: #ffffff; --soft: #1a2136;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b0f1c; --surface: #121829; --ink: #e4e7ef; --muted: #9aa1b6; --rule: #232b42;
  --link: #a9b9ff; --band: #070b17; --mark: rgba(255, 230, 60, .28); --mark-ink: #ffffff; --soft: #1a2136;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font: 15px/1.55 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--link); text-underline-offset: 3px; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid #f2cf00; outline-offset: 2px; border-radius: 3px; }
mark { background: var(--mark); color: var(--mark-ink); border-radius: 2px; padding: 0 1px; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.linkbtn { background: none; border: 0; padding: 0; color: var(--link); cursor: pointer; text-decoration: underline; text-decoration-color: transparent; text-underline-offset: 3px; }
.linkbtn:hover { text-decoration-color: currentColor; }

/* top bar */
.topbar { background: var(--band); border-bottom: 2px solid #f2cf00; }
.topbar .wrap { display: flex; align-items: center; gap: 14px; height: 56px; }
.topbar img { height: 26px; width: auto; display: block; }
.topbar .div { width: 1px; height: 22px; background: rgba(255,255,255,.25); }
.topbar .sec { color: #e9edf8; font: 600 14px/1 var(--sans); letter-spacing: .02em; }
.topbar nav { margin-left: auto; display: flex; gap: 18px; }
.topbar nav button { background: none; border: 0; color: rgba(233,237,248,.8); cursor: pointer; font-size: 13.5px; font-weight: 600; padding: 6px 0; }
.topbar nav button:hover { color: #fff; }

/* proceedings header */
.head { background: var(--surface); border-bottom: 1px solid var(--rule); }
.head .wrap { padding-top: 34px; padding-bottom: 30px; display: grid; gap: 14px; }
.head h1 { margin: 0; font: 600 38px/1.1 var(--serif); letter-spacing: -.01em; }
.head .sub { margin: 0; color: var(--muted); max-width: 66ch; font-size: 15.5px; }
.head .stats { font: 400 13px/1 var(--mono); color: var(--muted); }
.search { position: relative; max-width: 780px; margin-top: 6px; }
.search svg { position: absolute; left: 15px; top: 50%; transform: translateY(-50%); width: 18px; height: 18px; color: var(--muted); pointer-events: none; }
.search input { width: 100%; height: 50px; border: 1px solid #c9cfdb; border-radius: 8px; padding: 0 46px 0 44px; font: 500 16.5px/1 var(--sans); background: var(--surface); color: var(--ink); }
.search input:focus { outline: 3px solid #f2cf00; outline-offset: -1px; border-color: transparent; }
.search input::-webkit-search-cancel-button { display: none; }
.search .kbd, .search .clear { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); }
.search .kbd { font: 500 11.5px/1 var(--mono); color: var(--muted); border: 1px solid var(--rule); border-radius: 5px; padding: 4px 7px; }
.search .clear { border: 0; background: var(--soft); border-radius: 999px; width: 28px; height: 28px; cursor: pointer; font-size: 16px; line-height: 1; }
.hint { margin: 0; font-size: 13px; color: var(--muted); }
.hint code { font: 400 12.5px var(--mono); background: var(--soft); padding: 1px 5px; border-radius: 4px; }

/* volumes */
.volumes { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; padding-top: 26px; }
.vol { background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; padding: 18px 20px; display: grid; gap: 6px; align-content: start; }
.vol .eyebrow { font: 500 12px/1 var(--mono); color: var(--muted); }
.vol h2 { margin: 0; font: 600 20px/1.25 var(--serif); }
.vol p { margin: 0; color: var(--muted); font-size: 14px; }
.vol .row { display: flex; gap: 14px; margin-top: 6px; flex-wrap: wrap; }
.vol .row button { font-weight: 700; font-size: 13.5px; }

.volhead { background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; padding: 18px 20px; margin-bottom: 18px; display: grid; gap: 8px; }
.volhead h2 { margin: 0; font: 600 22px/1.25 var(--serif); }
.volhead p { margin: 0; color: var(--muted); font-size: 14px; max-width: 72ch; }

/* list layout */
.layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 36px; padding-top: 26px; padding-bottom: 56px; align-items: start; }
.rail { position: sticky; top: 16px; display: grid; gap: 22px; max-height: calc(100vh - 32px); overflow: auto; padding-right: 4px; }
.facet { border: 0; margin: 0; padding: 0; min-width: 0; }
.facet legend { font: 700 11px/1 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--muted); padding: 0 0 10px; }
.opt { display: grid; grid-template-columns: 16px 1fr auto; align-items: center; gap: 9px; padding: 3px 6px; margin: 0 -6px; border-radius: 5px; cursor: pointer; font-size: 14px; }
.opt:hover { background: var(--soft); }
.opt input { margin: 0; width: 15px; height: 15px; accent-color: var(--link); cursor: pointer; }
.opt .n { font: 400 12px/1 var(--mono); color: var(--muted); }
.opt.zero { color: var(--muted); opacity: .5; }
.opt.on { font-weight: 700; }
.more { background: none; border: 0; padding: 6px 0 0; color: var(--link); cursor: pointer; font-size: 13px; font-weight: 600; }
.ib { border: 1px solid var(--rule); background: var(--surface); border-radius: 7px; height: 34px; min-width: 34px; padding: 0 11px; cursor: pointer; font-size: 13px; font-weight: 600; display: inline-flex; align-items: center; justify-content: center; gap: 6px; }
.ib:hover:not(:disabled) { border-color: var(--link); }
.ib:disabled { opacity: .4; cursor: default; }
.ib.filters-toggle { display: none; }

.bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; padding-bottom: 12px; border-bottom: 1px solid var(--ink); }
.count { margin: 0; font: 600 15px/1.3 var(--sans); }
.active { display: flex; flex-wrap: wrap; gap: 6px; flex: 1; }
.pill { display: inline-flex; align-items: center; gap: 6px; background: var(--soft); color: var(--ink); border: 1px solid var(--rule); border-radius: 999px; padding: 2px 10px; font-size: 12.5px; font-weight: 600; cursor: pointer; }
.pill span { color: var(--muted); font-size: 14px; line-height: 1; }
.pill.ghost { background: none; border-color: transparent; color: var(--link); }
.sort { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); margin-left: auto; }
.sort select { font: 600 13px/1 var(--sans); color: var(--ink); background: var(--surface); border: 1px solid var(--rule); border-radius: 7px; padding: 7px 26px 7px 10px; }
.note { margin: 14px 0 0; padding: 10px 14px; border-radius: 8px; background: var(--soft); font-size: 14px; }
.list { list-style: none; margin: 0; padding: 0; }
.hit { padding: 20px 0 22px; border-bottom: 1px solid var(--rule); display: grid; gap: 5px; }
.hit h3 { margin: 0; font: 600 19px/1.3 var(--serif); text-wrap: balance; }
.hit h3 a { color: var(--ink); text-decoration: none; }
.hit h3 a:hover { color: var(--link); text-decoration: underline; }
.by { margin: 0; font-size: 14px; }
.by .org { color: var(--muted); }
.src { margin: 0; font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; }
.src em { font-style: italic; font-family: var(--serif); font-size: 14px; color: var(--ink); }
.src .pdf { font-weight: 700; text-decoration: none; display: inline-flex; gap: 5px; align-items: baseline; }
.src .pdf:hover { text-decoration: underline; }
.fmt { font: 600 10.5px/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; border: 1px solid currentColor; border-radius: 4px; padding: 3px 5px; position: relative; top: -1px; }
.snip { margin: 4px 0 0; font-size: 14.5px; line-height: 1.6; color: var(--ink); max-width: 80ch; opacity: .92; }
.kw { display: flex; flex-wrap: wrap; gap: 4px 14px; margin-top: 4px; font-size: 13px; }
.kw button { background: none; border: 0; padding: 0; color: var(--muted); cursor: pointer; }
.kw button::before { content: "#"; opacity: .55; margin-right: 1px; }
.kw button:hover, .kw button.on { color: var(--link); }
.kw button.on { font-weight: 700; }
.empty { padding: 48px 0; max-width: 60ch; }
.empty h3 { margin: 0 0 6px; font: 600 21px/1.3 var(--serif); }
.empty p { margin: 0; color: var(--muted); }

/* paper page */
.paper { padding-top: 22px; padding-bottom: 64px; }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 13.5px; color: var(--muted); }
.crumbs .sep { opacity: .5; }
.pnav { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.pnav .pos { font: 400 12.5px var(--mono); }
.pgrid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 44px; margin-top: 22px; align-items: start; }
.article { background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; padding: 34px 40px 40px; }
.kind { font: 600 12px/1.3 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.article h1 { margin: 10px 0 16px; font: 700 31px/1.2 var(--serif); letter-spacing: -.01em; text-wrap: balance; }
.authors { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; border-top: 1px solid var(--rule); }
.authors li { display: grid; grid-template-columns: minmax(0, 13rem) minmax(0, 1fr); gap: 2px 18px; padding: 8px 0; border-bottom: 1px solid var(--rule); align-items: baseline; }
.authors .who { background: none; border: 0; padding: 0; color: var(--link); cursor: pointer; font-weight: 600; font-size: 15.5px; text-align: left; }
.authors .who:hover { text-decoration: underline; }
.authors .aff { font-size: 14px; color: var(--muted); }
.authors .aff button { background: none; border: 0; padding: 0; color: var(--ink); cursor: pointer; text-align: left; }
.authors .aff button:hover { color: var(--link); text-decoration: underline; }
.authors .tag { font: 600 10.5px/1 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); border: 1px solid var(--rule); border-radius: 4px; padding: 3px 5px; margin-left: 8px; position: relative; top: -2px; }
.pager { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; padding-top: 22px; }
.pager .range { font: 400 13px var(--mono); color: var(--muted); margin-right: auto; }
.pager button { min-width: 36px; height: 36px; padding: 0 10px; border: 1px solid var(--rule); background: var(--surface); border-radius: 7px; cursor: pointer; font: 600 13.5px var(--sans); color: var(--ink); }
.pager button:hover:not(:disabled) { border-color: var(--link); }
.pager button[aria-current="page"] { background: var(--ink); color: var(--surface); border-color: var(--ink); }
.pager button:disabled { opacity: .4; cursor: default; }
.pager .gap { color: var(--muted); padding: 0 2px; }
.pubin { margin: 20px 0 0; padding: 12px 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); font-size: 14px; color: var(--muted); display: grid; gap: 3px; }
.pubin em { font-family: var(--serif); font-size: 15px; color: var(--ink); }
.article h2 { margin: 26px 0 10px; font: 700 12px/1 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--muted); }
.abstract { font: 400 17.5px/1.7 var(--serif); max-width: 68ch; }
.abstract p { margin: 0 0 .85em; }
.side { position: sticky; top: 16px; display: grid; gap: 16px; }
.box { background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; padding: 18px; display: grid; gap: 10px; }
.box h3 { margin: 0; font: 700 11px/1 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--muted); }
.dl { display: flex; align-items: center; gap: 10px; background: var(--band); color: #fff; text-decoration: none; border-radius: 8px; padding: 12px 14px; font-weight: 700; }
.dl svg { width: 20px; height: 20px; flex: none; }
.dl small { display: block; font: 400 12px/1.3 var(--mono); opacity: .75; }
.dl:hover { outline: 2px solid #f2cf00; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--rule); }
.tabs button { background: none; border: 0; border-bottom: 2px solid transparent; padding: 6px 8px; font-size: 13px; font-weight: 600; color: var(--muted); cursor: pointer; margin-bottom: -1px; }
.tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--ink); }
.cite { margin: 0; font: 400 12.5px/1.55 var(--mono); background: var(--soft); border-radius: 7px; padding: 11px 12px; white-space: pre-wrap; word-break: break-word; max-height: 260px; overflow: auto; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 7px; padding: 8px 12px; font-weight: 700; font-size: 13.5px; cursor: pointer; border: 1px solid var(--rule); background: var(--surface); color: var(--ink); }
.btn:hover { border-color: var(--link); }
.perm { font: 400 12px/1.45 var(--mono); color: var(--muted); word-break: break-all; }
.slots { display: grid; gap: 6px; font-size: 13.5px; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--ink); color: var(--surface); padding: 10px 16px; border-radius: 9px; font-weight: 600; font-size: 14px; z-index: 30; }

footer { border-top: 1px solid var(--rule); color: var(--muted); font-size: 13px; background: var(--surface); }
footer .wrap { padding-top: 22px; padding-bottom: 30px; display: grid; gap: 8px; }
footer h2 { margin: 0; font: 600 16px/1.3 var(--serif); color: var(--ink); }
footer p { margin: 0; max-width: 80ch; }

[hidden] { display: none !important; }
#ptitle:focus { outline: none; }
.dl.mobile { display: none; margin-top: 16px; }

@media (max-width: 980px) {
  .pgrid { grid-template-columns: 1fr; gap: 18px; }
  .side { position: static; }
  .article { padding: 24px 22px 28px; }
  .article h1 { font-size: 26px; }
  .authors li { grid-template-columns: 1fr; }
  .dl.mobile { display: flex; }
  .side > .dl { display: none; }
}
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; gap: 12px; }
  .rail { position: static; max-height: none; display: none; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px; padding: 16px; background: var(--surface); border: 1px solid var(--rule); border-radius: 10px; }
  .rail.open { display: grid; }
  .ib.filters-toggle { display: inline-flex; }
  .head h1 { font-size: 30px; }
}
@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .topbar .div, .topbar nav { display: none; }
  .hint { display: none; }
  .crumbs .vcrumb { display: none; }
}

/* production additions */
a.ib { text-decoration: none; color: var(--ink); }
.topbar a.home { display: flex; align-items: center; gap: 14px; text-decoration: none; }
.topbar nav a { color: rgba(233,237,248,.8); font-size: 13.5px; font-weight: 600; text-decoration: none; padding: 6px 0; }
.topbar nav a:hover { color: #fff; }
.authors .who { text-decoration: none; }
.authors .aff a { color: var(--ink); text-decoration: none; }
.authors .aff a:hover { color: var(--link); text-decoration: underline; }
.kw a { color: var(--muted); text-decoration: none; }
.kw a::before { content: "#"; opacity: .55; margin-right: 1px; }
.kw a:hover { color: var(--link); }
.cite[hidden] { display: none; }
.loading { padding: 40px 0; color: var(--muted); }
.notfound { padding: 80px 0; display: grid; gap: 10px; }
.notfound h1 { margin: 0; font: 600 34px/1.2 var(--serif); }