:root {
  --paper: #f5f0e6;
  --paper-2: #ebe4d5;
  --ink: #1d1a16;
  --muted: #5a5348;
  --accent: #a8341a;
  --rule: #b9ae9a;
  --focus: #1a4fd6;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: 1rem; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1.0625rem/1.5 var(--serif);
  overflow-wrap: anywhere;      /* stops long words forcing sideways scroll */
}

/* ---------- focus: every interactive element ---------- */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip {
  position: absolute; left: 1rem; top: -4rem;
  background: var(--ink); color: var(--paper);
  padding: .5rem .75rem; z-index: 10;
}
.skip:focus { top: 1rem; }

/* ---------- masthead ---------- */
.masthead {
  padding: 1.5rem 1rem 1rem;
  max-width: 68rem; margin: 0 auto;
  border-bottom: 3px solid var(--ink);
}
.where { margin: 0; font-size: .9375rem; color: var(--muted); }
h1 { margin: .25rem 0 1rem; font-size: clamp(1.75rem, 7vw, 3.25rem); line-height: 1.05; font-weight: 700; }
.masthead nav { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; }
.masthead a { color: var(--ink); text-decoration-thickness: 2px; text-underline-offset: 4px; font-weight: 600; }
.masthead a:hover { color: var(--accent); }

.site-footer {
  max-width: 68rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
  border-top: 3px solid var(--ink);
}
.site-footer p {
  margin: 0 0 .5rem;
  font: .8125rem/1.5 var(--mono);
  color: var(--muted);
}

.key { display: flex; flex-wrap: wrap; align-items: center; gap: .25rem .5rem; }
.key .sw { flex: none; }
.sw { width: .875rem; height: .875rem; border: 1px solid var(--ink); margin-left: .75rem; }
.sw:first-child { margin-left: 0; }
.sw-a { background: #e4ebdc; border-left: 4px solid #3f6b3a; }
.sw-b { background: #f1e0d6; border-left: 4px double #a8341a; }
.sw-c { background: #dde5ea; border-left: 4px dashed #35607a; }

/* ---------- days and slots ---------- */
main { max-width: 68rem; margin: 0 auto; padding: 0 1rem 2rem; }
h2 { font-size: 1.5rem; margin: 2.5rem 0 .5rem; }

.slot { border-top: 1px solid var(--rule); padding: 1rem 0; }
.slot h3 { margin: 0 0 .5rem; font: 600 1rem var(--mono); font-variant-numeric: tabular-nums; }
.slot h3 span { color: var(--muted); font-weight: 400; }

.sessions { list-style: none; margin: 0; padding: 0; display: grid; gap: .75rem; }

/* ---------- session button ---------- */
.session-btn {
  display: block; width: 100%;
  margin: 0; padding: .75rem .875rem;
  text-align: left; font: inherit; color: inherit;
  background: transparent;
  border: 1px solid var(--ink);
  border-left-width: 6px;
  border-radius: 0;
  cursor: pointer;
}
.session-btn span { display: block; }
.track-label { font-size: .875rem; font-weight: 600; color: var(--accent); margin-bottom: .25rem; }
.title { font-weight: 700; line-height: 1.25; }
.who { color: var(--muted); font-size: .9375rem; margin-top: .25rem; }

/* one muted tint per track; border style still differs too */
.a { --t-bg: #e4ebdc; --t-line: #3f6b3a; --t-ink: #2f5230; }
.b { --t-bg: #f1e0d6; --t-line: #a8341a; --t-ink: #8a2a14; }
.c { --t-bg: #dde5ea; --t-line: #35607a; --t-ink: #274a60; }

.a .session-btn,
.b .session-btn,
.c .session-btn {
  background: var(--t-bg);
  border-color: var(--t-line);
}
.a .track-label,
.b .track-label,
.c .track-label { color: var(--t-ink); }

.a .session-btn { border-left-style: solid; }
.b .session-btn { border-left-style: double; }
.c .session-btn { border-left-style: dashed; }

.all .session-btn { background: var(--paper-2); }

.session-btn:hover .title { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 3px; }


/* ---------- wide screens: three columns ---------- */
@media (min-width: 52rem) {
  .slot { display: grid; grid-template-columns: 8rem minmax(0, 1fr); gap: 0 1rem; }
  .slot h3 { margin: .25rem 0 0; }
  .sessions { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
  .a { grid-column: 1; }
  .b { grid-column: 2; }
  .c { grid-column: 3; }
  .all { grid-column: 1 / -1; }
  .session-btn { height: 100%; }
}

/* ---------- dialog ---------- */
dialog {
  width: min(38rem, calc(100vw - 2rem));
  max-height: calc(100dvh - 2rem);
  padding: 0; margin: auto;
  border: 2px solid var(--ink);
  background: var(--paper); color: var(--ink);
  overflow: auto;
}
dialog::backdrop { background: rgb(29 26 22 / .6); }
.dialog-inner { padding: 1rem 1.25rem 1.5rem; }
.close {
  display: block; margin: 0 0 1rem auto;
  font: 600 .9375rem var(--mono);
  padding: .5rem .875rem;
  background: var(--ink); color: var(--paper);
  border: 2px solid var(--ink); border-radius: 0; cursor: pointer;
}
.close:hover { background: var(--accent); border-color: var(--accent); }
.detail-body h2 { margin: 0 0 .5rem; font-size: 1.5rem; line-height: 1.15; }
.detail-body .meta { font: .875rem var(--mono); color: var(--muted); margin: 0 0 1rem; }