/* Layout: full-width header bar and banner; all text in one centered column. */
:root {
  --bg: #f6f0e6;        /* cream */
  --ink: #2b1d14;       /* dark roast */
  --muted: #7a6656;
  --rule: #e2d6c4;
  --accent: #8a5a36;    /* coffee brown: header bar, links, next date */
  --on-accent: #f6f0e6;
  --maxw: 880px;
  --gutter: 24px;
  --f-head: "Source Serif 4", Georgia, "Times New Roman", serif;
  --f-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: max(var(--gutter), env(safe-area-inset-left, 0px));
  padding-right: max(var(--gutter), env(safe-area-inset-right, 0px));
}

/* Header bar */
.site-header { background: var(--accent); }
.site-header .inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 24px;
  padding-block: 12px;
}
.site-name {
  color: var(--on-accent);
  font-family: var(--f-head);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.site-name:hover { text-decoration: none; }
.site-nav { display: flex; gap: 22px; font-size: 15px; }
.site-nav a { color: var(--on-accent); text-underline-offset: 4px; }
.site-nav a[aria-current="page"] { text-decoration: underline; }
.site-header a:focus-visible { outline-color: var(--on-accent); }

/* Banner */
.banner {
  display: block;
  width: 100%;
  height: clamp(180px, 30vw, 380px);
  object-fit: cover;
  object-position: 50% 45%;
  filter: grayscale(1);
}

/* Main content */
main.inner {
  display: grid;
  gap: 36px;
  padding-block: 36px 48px;
}
h1, h2 {
  font-family: var(--f-head);
  font-weight: 600;
  text-wrap: balance;
  margin: 0;
}
h1 { font-size: 30px; line-height: 1.2; margin-bottom: 12px; }
h2 {
  font-size: 22px;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--rule);
}
p { margin: 0 0 12px; }
p:last-child { margin-bottom: 0; }
.lede { font-size: 19px; line-height: 1.5; text-wrap: pretty; }

/* Session details */
.meta {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 28px;
  margin: 0;
}
.meta dt { color: var(--muted); font-size: 14px; padding-top: 2px; }
.meta dd { margin: 0; font-weight: 500; }
#next-date { color: var(--accent); }
#next-rel { color: var(--muted); font-weight: 400; margin-left: 6px; }
#next-rel.live {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px;
  border-radius: 3px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  vertical-align: 2px;
}

/* Paper list */
.paper-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.paper-list li { display: grid; gap: 2px; }
.paper-id { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.paper-title { font-family: var(--f-head); font-weight: 600; font-size: 18px; line-height: 1.35; }
.paper-authors { color: var(--muted); font-size: 14px; }
.demo-tag {
  margin-left: 10px;
  padding: 1px 6px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  color: var(--muted);
  font-family: var(--f-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  vertical-align: 4px;
}
.demo-note { margin-top: 14px; color: var(--muted); font-size: 13px; font-style: italic; }

/* Footer */
.site-footer { border-top: 1px solid var(--rule); color: var(--muted); font-size: 13px; }
.site-footer .inner { padding-block: 18px 28px; }

@media (max-width: 560px) {
  :root { --gutter: 16px; }
  .meta { grid-template-columns: 1fr; gap: 0; }
  .meta dd { margin-bottom: 10px; }
}