:root {
  --ink: #222;
  --soft: #555; /* used sparingly: footer only */
  --line: #e6e6e6;
  --c1: #2f7d7a; /* teal   */
  --c2: #b4531f; /* orange (darkened for contrast with white text) */
  --c3: #5e4f9e; /* purple */
  --head: "Fraunces", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: #fff; color: var(--ink); font-family: var(--sans); line-height: 1.55; }
a { color: inherit; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--c3); }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--c3); outline-offset: 2px; }

/* Visually hidden, still read by screen readers */
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.page { max-width: 720px; margin: 0 auto; padding: 56px 24px 80px; }

h1, h2 { font-family: var(--head); font-variation-settings: "SOFT" 100, "WONK" 0; line-height: 1.1; margin: 0; }
h1 { font-size: 3.2rem; font-weight: 500; letter-spacing: -0.015em; }
h2 { font-size: 2rem; font-weight: 400; letter-spacing: -0.01em; margin: 64px 0 14px; }

/* Header */
.when { font-family: var(--mono); font-size: .95rem; margin: 10px 0 6px; }
.tags { margin: 0 0 18px; }
.intro { margin: 0 0 12px; }
.nav { display: flex; flex-wrap: wrap; gap: 6px 22px; margin-top: 18px; font-family: var(--mono); font-size: .85rem; }

/* Small solid label, as in the reference */
.tag { display: inline-block; font-family: var(--mono); font-size: .72rem; font-weight: 600; color: #fff; padding: 1px 6px; border-radius: 2px; vertical-align: middle; }
.tag.c1 { background: var(--c1); }
.tag.c2 { background: var(--c2); }
.tag.c3 { background: var(--c3); }

/* Monospace note with a thin coloured left rule */
.note { font-family: var(--mono); font-size: .86rem; line-height: 1.7; max-width: 64ch; border-left: 2px solid var(--line); padding: 2px 0 2px 14px; margin: 10px 0; }
.note p { margin: .35em 0; }
.note.c1, .c1 .note { border-color: var(--c1); }
.note.c2, .c2 .note { border-color: var(--c2); }
.c1 details summary { color: var(--c1); }
.c2 details summary { color: var(--c2); }
.note.c3 { border-color: var(--c3); }

/* Programme: day tabs */
.day-tabs { display: flex; flex-wrap: wrap; gap: 10px; margin: 6px 0 14px; }
.day-tabs button { font: inherit; text-align: left; cursor: pointer; background: #fff; color: var(--ink); border: 1px solid #cfcfcf; border-radius: 4px; padding: 10px 14px; display: flex; flex-direction: column; gap: 4px; flex: 1 1 260px; }
.day-tabs button .tab-label { font-weight: 600; }
.day-tabs button[aria-selected="true"] { border-width: 2px; padding: 9px 13px; }
.day-tabs button[aria-selected="true"].c1 { border-color: var(--c1); }
.day-tabs button[aria-selected="true"].c2 { border-color: var(--c2); }
.day-tabs button:focus-visible { outline: 2px solid var(--c3); outline-offset: 2px; }
.day-tabs .c1 .tag { background: var(--c1); }
.day-tabs .c2 .tag { background: var(--c2); }
.tag { align-self: flex-start; }

.day-title { margin: 22px 0 4px; }
.session { font-family: var(--head); font-variation-settings: "SOFT" 100, "WONK" 0; font-weight: 500; font-size: 1.4rem; margin: 30px 0 4px; }
.c1 .session { color: var(--c1); }
.c2 .session { color: var(--c2); }
.slot { font-family: var(--mono); font-size: .86rem; margin: 6px 0; }
.slot-time { font-weight: 600; margin-right: 8px; }
.slot.break { border-left: 2px solid var(--c3); padding: 6px 0 6px 14px; margin: 26px 0; }
.slot-icon { width: 22px; height: 22px; vertical-align: -6px; margin-right: 8px; fill: none; stroke: var(--c3); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

/* Programme: talks */
.talk { display: grid; grid-template-columns: 96px 1fr; gap: 20px; padding: 14px 0; }
.talk-time { font-family: var(--mono); font-size: .8rem; font-weight: 600; margin: 0 0 2px; }
.c1 .talk-time { color: var(--c1); }
.c2 .talk-time { color: var(--c2); }
.talk-title { font-family: var(--sans); font-weight: 600; font-size: 1.1rem; line-height: 1.3; margin: 0 0 4px; }
.talk-who { margin: 0 0 6px; }
.talk-who strong { font-weight: 600; }
.talk-bio { font-size: .92rem; line-height: 1.6; margin: 0 0 6px; max-width: 62ch; }
.tba { font-style: italic; font-weight: 400; }

details { margin-top: 4px; }
details summary { cursor: pointer; font-family: var(--mono); font-size: .8rem; color: var(--c1); list-style: none; }
details summary::-webkit-details-marker { display: none; }
details summary::before { content: "+ "; }
details[open] summary::before { content: "– "; }

/* Avatars: photo, or initials in an outlined circle when there is none */
.avatar { width: 96px; height: 96px; margin-top: 2px; border-radius: 50%; background: #fff; border: 1px solid var(--line); position: relative; overflow: hidden; }
.avatar::before { content: attr(data-initials); position: absolute; inset: 0; display: grid; place-items: center; font-family: var(--head); font-size: 2rem; color: var(--c1); }
.avatar img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
a.site:hover .avatar { opacity: .85; }

.foot { margin-top: 72px; padding-top: 14px; border-top: 1px solid var(--line); font-family: var(--mono); font-size: .8rem; color: var(--soft); }
.foot { display: flex; align-items: center; gap: 20px; }
.foot p { margin: .3em 0; }
.foot .made { font-size: .72rem; margin-top: .8em; }
.pan-logo img { display: block; width: 115px; height: auto; }

@media (max-width: 560px) {
  .page { padding: 32px 18px 64px; }
  h1 { font-size: 2.4rem; }
  h2 { margin-top: 48px; }
  .foot { flex-direction: column; align-items: flex-start; }
  .talk { grid-template-columns: 64px 1fr; gap: 14px; }
  .avatar { width: 64px; height: 64px; }
  .avatar::before { font-size: 1.4rem; }
}