/* ── Day navigation ─────────────────────────────────────────────────── */
.prog-day-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--clr-dark);
  display: flex;
  gap: 2px;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 2px solid var(--clr-accent);
}
.prog-day-nav::-webkit-scrollbar { display: none; }

.prog-day-nav a {
  flex-shrink: 0;
  padding: 12px 20px;
  color: rgba(255,255,255,.65);
  text-decoration: none;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.prog-day-nav a:hover { background: rgba(255,255,255,.08); color: #fff; }
.prog-day-nav a.prog-day-nav--main {
  color: var(--clr-accent);
  border-bottom: 2px solid var(--clr-accent);
  margin-bottom: -2px;
}
.prog-day-nav a.prog-day-nav--main:hover { background: rgba(43,179,163,.1); }

/* ── Day section ────────────────────────────────────────────────────── */
.prog-day {
  padding: 2.5rem 0 3rem;
  border-bottom: 1px solid var(--clr-border);
  scroll-margin-top: 50px;
}
.prog-day-header { margin-bottom: 1.6rem; }
.prog-day-label {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 4px;
}
.prog-day-title {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--clr-dark);
  margin: 0;
}
.prog-day-subtitle {
  font-size: .88rem;
  color: var(--clr-subtle);
  margin-top: 4px;
}

/* ── Timeline ───────────────────────────────────────────────────────── */
.prog-timeline {
  display: flex;
  flex-direction: column;
  border-left: 2px solid var(--clr-border);
  margin-left: 96px;
}

.prog-entry {
  display: flex;
  position: relative;
}
.prog-entry::before {
  content: '';
  position: absolute;
  left: -7px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--clr-border);
  border: 2px solid #fff;
}

.prog-time {
  position: absolute;
  left: -96px;
  top: 14px;
  width: 84px;
  text-align: right;
  font-size: .72rem;
  font-weight: 600;
  color: var(--clr-subtle);
  white-space: normal;
  word-break: break-all;
  font-family: monospace;
  line-height: 1.3;
}

.prog-body {
  flex: 1;
  padding: 10px 0 10px 20px;
}

/* ── Entry types ────────────────────────────────────────────────────── */
.prog-entry--keynote::before { background: var(--clr-accent); }
.prog-entry--keynote .prog-body {
  background: rgba(43,179,163,.06);
  border-left: 3px solid var(--clr-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 12px 16px;
  margin: 4px 0;
}

.prog-entry--special::before { background: #d97706; }
.prog-entry--special .prog-body {
  background: rgba(217,119,6,.07);
  border-left: 3px solid #d97706;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 12px 16px;
  margin: 4px 0;
}

.prog-entry--break::before { background: #ccc; }
.prog-entry--break .prog-body {
  padding: 8px 16px;
  color: var(--clr-subtle);
  font-size: .85rem;
}

.prog-entry--invited::before { background: #7c3aed; }
.prog-entry--invited .prog-body {
  background: rgba(124,58,237,.05);
  border-left: 3px solid #7c3aed;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 12px 16px;
  margin: 4px 0;
}

.prog-entry--session .prog-body {
  margin: 4px 0;
  padding: 0 0 0 16px;
}

/* ── Badge ──────────────────────────────────────────────────────────── */
.prog-badge {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 4px;
  vertical-align: middle;
}
.prog-badge--keynote  { background: rgba(43,179,163,.15); color: #1a8a7a; }
.prog-badge--invited  { background: rgba(124,58,237,.12); color: #6d28d9; }
.prog-badge--special  { background: rgba(217,119,6,.12);  color: #b45309; }
.prog-badge--workshop { background: rgba(59,130,246,.1);  color: #1d4ed8; }
.prog-badge--session  { background: rgba(13,27,46,.07);   color: #4f6275; }
.prog-badge--poster   { background: rgba(236,72,153,.1);  color: #be185d; }

/* ── Entry content ──────────────────────────────────────────────────── */
.prog-entry-title {
  font-weight: 700;
  font-size: .97rem;
  color: var(--clr-dark);
  margin: 0 0 2px;
  line-height: 1.3;
}
.prog-entry-speaker { font-size: .88rem; color: var(--clr-subtle); margin: 0; }
.prog-entry-affil   { font-size: .82rem; color: var(--clr-subtle); }

/* ── Session with papers ────────────────────────────────────────────── */
.prog-session {
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin: 4px 0;
}
.prog-session summary {
  padding: 10px 14px;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 10px;
  background: var(--clr-light);
  user-select: none;
}
.prog-session summary::-webkit-details-marker { display: none; }
.prog-session summary::after {
  content: '▸';
  margin-left: auto;
  font-size: .75rem;
  color: var(--clr-subtle);
  transition: transform .2s;
  flex-shrink: 0;
}
.prog-session[open] summary::after { transform: rotate(90deg); }
.prog-session summary:hover { background: rgba(43,179,163,.05); }

.prog-session-title { font-weight: 700; font-size: .95rem; }
.prog-session-chair { font-size: .8rem; color: var(--clr-subtle); }

.prog-papers {
  padding: 4px 0 8px;
  border-top: 1px solid var(--clr-border);
}
.prog-paper {
  padding: 8px 14px;
  border-bottom: 1px solid rgba(0,0,0,.04);
  font-size: .88rem;
}
.prog-paper:last-child { border-bottom: none; }
.prog-paper-title   { color: var(--clr-dark); font-weight: 500; margin-bottom: 2px; }
.prog-paper-authors { color: var(--clr-subtle); font-size: .82rem; }

/* ── Parallel tracks (Mon / Tue) ────────────────────────────────────── */
.prog-track-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 4px 0;
  padding: 0 0 0 16px;
}
.prog-track {
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.prog-track-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  background: var(--clr-dark);
  color: #fff;
}
.prog-track-header.track--workshops { background: #1d4ed8; }
.prog-track-header.track--course    { background: #065f46; }
.prog-track-header.track--tutorial  { background: #6d28d9; }
.prog-track-header.track--phocon    { background: #0e7490; }
.prog-track-header.track--ataed     { background: #92400e; }
.prog-track-header.track--mcc       { background: #374151; }

.prog-track-content { padding: 10px 12px; font-size: .86rem; }
.prog-track-content .prog-paper { padding: 5px 0; border-bottom: 1px solid var(--clr-border); }
.prog-track-content .prog-paper:last-child { border: none; }
.prog-track-lecturer {
  font-size: .82rem;
  color: var(--clr-subtle);
  font-style: italic;
  margin-bottom: 6px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--clr-border);
}

/* ── Progressive enhancement — hide interactive elements without JS ──── */
.cal-bar,
.cal-toggle,
.prog-cal-hint { display: none; }

.js-ready .cal-bar        { display: flex; }
.js-ready .cal-toggle     { display: inline-flex; }
.js-ready .prog-cal-hint  { display: flex; }

/* ── Calendar hint ──────────────────────────────────────────────────── */
.prog-cal-hint {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .84rem;
  color: var(--clr-subtle);
  margin-bottom: .75rem;
}

/* ── Calendar schedule bar ──────────────────────────────────────────── */
.cal-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--clr-dark);
  color: #fff;
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
  font-size: .88rem;
}
.cal-bar__count {
  background: var(--clr-accent);
  color: #fff;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 700;
}
.cal-bar__clear {
  display: none;
  background: transparent;
  border: 1px solid rgba(255,255,255,.3);
  color: rgba(255,255,255,.8);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  cursor: pointer;
  font-size: .82rem;
  transition: color .15s, border-color .15s;
}
.cal-bar__clear:hover { color: #fff; border-color: rgba(255,255,255,.6); }
.cal-bar__export {
  background: var(--clr-accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  font-size: .85rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity .15s;
}
.cal-bar__export:disabled {
  opacity: .4;
  cursor: not-allowed;
}
.cal-bar__export:not(:disabled):hover { opacity: .85; }

/* ── Calendar selection highlight ───────────────────────────────────── */
[data-eid].cal-selected {
  outline: 2px solid var(--clr-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}
[data-eid].cal-selected > .prog-body {
  background: rgba(43,179,163,.08) !important;
  border-radius: var(--radius-sm);
}
[data-eid].cal-selected .prog-track-header {
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.6);
}
[data-eid].cal-selected .prog-track-content {
  background: rgba(43,179,163,.06);
}

/* ── Calendar toggle button ─────────────────────────────────────────── */
.cal-toggle {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1.5px solid var(--clr-accent);
  background: transparent;
  color: var(--clr-accent);
  font-size: .72rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, color .15s;
  white-space: nowrap;
  flex-shrink: 0;
  line-height: 1.4;
}
.cal-toggle:hover { background: rgba(43,179,163,.1); }
.cal-toggle.is-added,
[data-eid].cal-selected .cal-toggle {
  background: var(--clr-accent);
  color: #fff;
  border-color: var(--clr-accent);
}

/* Toggle in body (before details) */
.prog-body > .cal-toggle { margin: 0 0 6px 0; }

/* Toggle inside track header */
.prog-track-header .cal-toggle {
  border-color: rgba(255,255,255,.7);
  color: rgba(255,255,255,.9);
  font-size: .68rem;
  padding: 2px 7px;
  margin-left: 0;
}
.prog-track-header .cal-toggle:hover { background: rgba(255,255,255,.15); }
.prog-track-header .cal-toggle.is-added,
[data-eid].cal-selected .prog-track-header .cal-toggle {
  background: rgba(255,255,255,.25);
  color: #fff;
  border-color: #fff;
}

/* ── PDF download strip ─────────────────────────────────────────────── */
.prog-download-strip {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 2rem;
  padding: 14px 18px;
  background: var(--clr-light);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  align-items: center;
  font-size: .88rem;
}
.prog-download-strip strong { margin-right: 4px; }

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .prog-timeline { margin-left: 70px; }
  .prog-time { left: -70px; width: 58px; font-size: .68rem; }
  .prog-track-grid { grid-template-columns: 1fr; }
  .prog-day-nav a { padding: 10px 14px; }
}

/* ── Dark mode ──────────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  .prog-day-nav { background: #0a1628; }
  .prog-entry--keynote .prog-body { background: rgba(43,179,163,.08); }
  .prog-entry--special .prog-body { background: rgba(217,119,6,.1); }
  .prog-entry--invited .prog-body { background: rgba(124,58,237,.08); }
  .prog-session summary { background: #14273d; }
  .prog-track-content .prog-paper { border-color: rgba(255,255,255,.06); }
}