:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --line: #e5e7eb;
  --line-strong: #d1d5db;
  --header-bg: #f3f4f6;
  --slot-min-height: 6px;
  --hour-col-w: 54px;
  --side-pad: 20px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 14px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.topbar {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding: 12px var(--side-pad);
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.topbar h1 { font-size: 18px; margin: 0; font-weight: 600; }
.semester { color: var(--muted); font-size: 13px; }

.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 20px;
  padding: var(--side-pad);
  align-items: start;
}

/* SIDEBAR */
.sidebar h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 10px;
  font-weight: 600;
}

.people-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.person {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 8px;
  background: #fff;
  min-width: 0;
}

.person-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  border-radius: 4px;
}

.person-name { font-weight: 500; }

.person-notes {
  margin: 6px 0 0 22px;
  font-size: 12px;
  color: #4b5563;
  white-space: pre-wrap;
  line-height: 1.35;
}

.person-meta {
  margin: 4px 0 0 22px;
  font-size: 11px;
  color: var(--muted);
  font-style: italic;
}

.person-async {
  margin: 8px 0 0 22px;
  font-size: 11px;
  color: #374151;
}
.person-async-title {
  font-weight: 600;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 4px;
}
.person-async-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.person-async-list li { margin: 2px 0; }
.person-async-course {
  display: inline;
  padding: 0;
  margin: 0;
  border: none;
  background: none;
  font: inherit;
  color: #1d4ed8;
  cursor: pointer;
  text-align: left;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 2px;
}
.person-async-course:hover {
  color: #1e40af;
}

.swatch {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  border: 1px solid rgba(0,0,0,0.1);
  flex-shrink: 0;
}

.howto {
  font-size: 12px;
  color: var(--muted);
  background: #fff;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.howto summary { cursor: pointer; font-weight: 600; }
.howto ol, .howto ul { margin: 8px 0 0; padding-left: 18px; }
.howto code { background: #f3f4f6; padding: 1px 4px; border-radius: 3px; font-size: 11px; }

/* CALENDAR */
.calendar-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.calendar {
  display: grid;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  min-width: min-content;
  position: relative;
}

.cal-corner,
.cal-day-header,
.cal-hour-label,
.cal-cell {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.cal-day-header {
  background: var(--header-bg);
  text-align: center;
  font-weight: 600;
  padding: 8px 4px;
  position: sticky;
  top: 0;
  z-index: 2;
  font-size: 13px;
  white-space: nowrap;
}

.day-short { display: none; }

.cal-corner {
  background: var(--header-bg);
  position: sticky;
  top: 0;
  left: 0;
  z-index: 6;
}

.cal-hour-label {
  font-size: 11px;
  color: var(--muted);
  text-align: right;
  padding: 2px 6px 0 0;
  background: #fff;
  position: sticky;
  left: 0;
  /* Above .event (z-index ≤3) so horizontal scroll doesn’t paint lanes over times */
  z-index: 5;
  white-space: nowrap;
  box-shadow: 6px 0 10px -4px rgba(0, 0, 0, 0.12);
}

.cal-cell {
  min-height: var(--slot-min-height);
  border-right: 1px solid var(--line);
  border-bottom: none;
}

.cal-cell.minor { border-bottom: none; }
.cal-cell.half { border-bottom: 1px dashed var(--line); }
.cal-cell.hour { border-bottom: 1px solid var(--line-strong); }

.event {
  margin: 1px;
  padding: 3px 4px;
  border-radius: 3px;
  font-size: 11px;
  line-height: 1.15;
  background-color: var(--ev-bg);
  border-left: 3px solid var(--ev-border);
  color: #0a0a0a;
  overflow: hidden;
  pointer-events: auto;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  min-width: 0;
  cursor: pointer;
  transition: filter 0.1s ease, box-shadow 0.1s ease, outline 0.1s ease;
  outline: 3px solid transparent;
  outline-offset: -2px;
  position: relative;
  z-index: 1;
}
.event:hover { filter: brightness(0.95); }
.event.active {
  outline-color: var(--ev-border);
  outline-style: solid;
  filter: brightness(0.92);
  z-index: 3;
  box-shadow:
    0 0 0 1px #fff,
    0 0 0 3px rgba(0, 0, 0, 0.4);
}
.event.related {
  outline-color: #0f172a;
  outline-style: dashed;
  z-index: 2;
  box-shadow:
    0 0 0 1px #fff,
    0 0 0 3px rgba(15, 23, 42, 0.45);
}

.event .ev-code {
  font-weight: 600;
  line-height: 1.15;
  overflow: hidden;
  word-break: normal;
  overflow-wrap: normal;
}

/* Keep program code + number atomic so "CMPT" never breaks as "CMP" + "T" */
.event .ev-prefix,
.event .ev-num {
  white-space: nowrap;
}

.event .ev-prefix {
  color: #374151;
  font-weight: 600;
  font-size: 0.92em;
}

/* CAMPUS LEGEND */
.campus-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  margin: 0 0 8px;
  padding: 6px 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 12px;
  color: #374151;
}
.legend-label {
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 11px;
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.legend-swatch {
  display: inline-block;
  width: 18px;
  height: 14px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background-color: #d4d4d8;
}
.legend-swatch[data-online="true"] {
  border-style: dashed;
  border-width: 2px;
  background-color: #fff;
}
.popover-campus-swatch[data-online="true"] {
  border-style: dashed;
  border-width: 2px;
}

/* CAMPUS PATTERN OVERLAYS - shared between events, legend swatches, and popover */
.event[data-pattern="solid"],
.legend-swatch[data-pattern="solid"],
.popover-campus-swatch[data-pattern="solid"] {
  background-image: none;
}
.event[data-pattern="stripes"],
.legend-swatch[data-pattern="stripes"],
.popover-campus-swatch[data-pattern="stripes"] {
  background-image: repeating-linear-gradient(
    45deg,
    transparent 0,
    transparent 4px,
    rgba(255, 255, 255, 0.55) 4px,
    rgba(255, 255, 255, 0.55) 7px
  );
}
.event[data-pattern="dots"],
.legend-swatch[data-pattern="dots"],
.popover-campus-swatch[data-pattern="dots"] {
  background-image: radial-gradient(rgba(255, 255, 255, 0.7) 1.4px, transparent 1.6px);
  background-size: 7px 7px;
}
.event[data-pattern="crosshatch"],
.legend-swatch[data-pattern="crosshatch"],
.popover-campus-swatch[data-pattern="crosshatch"] {
  background-image:
    repeating-linear-gradient(45deg, transparent 0 5px, rgba(255,255,255,0.45) 5px 6px),
    repeating-linear-gradient(-45deg, transparent 0 5px, rgba(255,255,255,0.45) 5px 6px);
}
.event[data-pattern="vstripes"],
.legend-swatch[data-pattern="vstripes"],
.popover-campus-swatch[data-pattern="vstripes"] {
  background-image: repeating-linear-gradient(
    90deg,
    transparent 0 5px,
    rgba(255, 255, 255, 0.5) 5px 7px
  );
}
.event[data-pattern="hstripes"],
.legend-swatch[data-pattern="hstripes"],
.popover-campus-swatch[data-pattern="hstripes"] {
  background-image: repeating-linear-gradient(
    0deg,
    transparent 0 5px,
    rgba(255, 255, 255, 0.5) 5px 7px
  );
}

/* popover campus swatch uses the event's color as its background-color via a var */
.popover-campus-swatch {
  background-color: var(--pop-campus-color, #d4d4d8);
}

.status {
  color: var(--muted);
  font-size: 12px;
  margin: 8px 2px;
}
.status.error { color: #b91c1c; }

/* POPOVER */
.popover {
  position: fixed;
  z-index: 50;
  background: #fff;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.08);
  padding: 12px 14px 10px;
  min-width: 220px;
  max-width: 300px;
  font-size: 13px;
  color: var(--fg);
}
.popover[hidden] { display: none; }

.popover-close {
  position: absolute;
  top: 4px;
  right: 6px;
  background: transparent;
  border: none;
  font-size: 20px;
  line-height: 1;
  color: var(--muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
}
.popover-close:hover { background: #f3f4f6; color: var(--fg); }

.popover-person {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
  margin: 0 24px 4px 0;
  font-weight: 500;
}
.popover-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--pop-person-color, #999);
}

.popover-title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.popover-online-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 6px;
  border: 1.5px dashed var(--line-strong);
  border-radius: 4px;
  color: var(--muted);
  background: #f9fafb;
}
.popover-online-badge[hidden] { display: none; }

.popover-time {
  white-space: nowrap;
}
.popover-time.popover-time-async {
  white-space: normal;
  display: block;
  line-height: 1.45;
  align-self: start;
}
.popover-time-ref {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.popover-details {
  margin: 0;
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 4px 10px;
  font-size: 13px;
}
.popover-row { display: contents; }
.popover-row dt {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 500;
  align-self: center;
}
.popover-row dd {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}
.popover-row[hidden] { display: none; }

.popover-campus-swatch {
  display: inline-block;
  width: 16px;
  height: 12px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background-color: #d4d4d8;
  flex-shrink: 0;
}

@media (max-width: 420px) {
  .popover {
    left: 10px !important;
    right: 10px !important;
    max-width: none;
    width: auto;
  }
}

/* DENSITY-BASED EVENT STYLING.
   Prefix/number use nowrap so codes like CMPT stay intact.
   Labels off from lane 5 up (each lane has its own block = more variations).
   Below lane 5, shorter meetings can still hide labels via .ev-short tiers.
   Breakpoints add further label-off variations at 4 / 3 / 2 lanes. */

.calendar[data-lanes="2"] .event {
  font-size: 11px;
  padding: 3px 4px;
}
.calendar[data-lanes="2"] .event.ev-short .ev-code { display: none; }

.calendar[data-lanes="3"] .event {
  font-size: 10.5px;
  padding: 2px 3px;
}
.calendar[data-lanes="3"] .event.ev-short .ev-code { display: none; }

.calendar[data-lanes="4"] .event {
  font-size: 10px;
  padding: 2px 3px;
  border-left-width: 3px;
}
.calendar[data-lanes="4"] .event.ev-short .ev-code { display: none; }

/* Lanes 5–12: no labels; block size steps down as lanes increase */
.calendar[data-lanes="5"] .event {
  font-size: 10px;
  padding: 2px 3px;
  border-left-width: 3px;
}
.calendar[data-lanes="5"] .ev-code { display: none; }

.calendar[data-lanes="6"] .event {
  font-size: 9.75px;
  padding: 2px 3px;
  border-left-width: 3px;
}
.calendar[data-lanes="6"] .ev-code { display: none; }

.calendar[data-lanes="7"] .event {
  font-size: 9.5px;
  padding: 2px 2px;
  border-left-width: 2px;
}
.calendar[data-lanes="7"] .ev-code { display: none; }

.calendar[data-lanes="8"] .event {
  font-size: 9.25px;
  padding: 1px 2px;
  border-left-width: 2px;
}
.calendar[data-lanes="8"] .ev-code { display: none; }

.calendar[data-lanes="9"] .event {
  font-size: 9px;
  padding: 1px 2px;
  border-left-width: 2px;
}
.calendar[data-lanes="9"] .ev-code { display: none; }

.calendar[data-lanes="10"] .event {
  font-size: 8.75px;
  padding: 1px 2px;
  border-left-width: 2px;
}
.calendar[data-lanes="10"] .ev-code { display: none; }

.calendar[data-lanes="11"] .event {
  font-size: 8.5px;
  padding: 1px 1px;
  border-left-width: 2px;
}
.calendar[data-lanes="11"] .ev-code { display: none; }

.calendar[data-lanes="12"] .event {
  font-size: 8.25px;
  padding: 1px 1px;
  border-left-width: 2px;
}
.calendar[data-lanes="12"] .ev-code { display: none; }

/* RESPONSIVE: TABLET / SMALL LAPTOP */
@media (max-width: 900px) {
  :root { --side-pad: 12px; }
  .layout { gap: 14px; }
  .topbar { padding: 10px var(--side-pad); }

  /* Variation: label-off at 4 lanes (desktop keeps labels through lane 4) */
  .calendar[data-lanes="4"] .ev-code { display: none; }
}

/* RESPONSIVE: MOBILE - SIDEBAR REFLOWS ABOVE CALENDAR */
@media (max-width: 720px) {
  :root {
    --hour-col-w: 38px;
    --side-pad: 10px;
  }
  .layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }
  .topbar h1 { font-size: 16px; }
  .semester { font-size: 12px; }

  .sidebar h2 { margin-bottom: 6px; }
  .people-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 10px;
  }
  .person {
    flex: 1 1 45%;
    min-width: 140px;
    padding: 5px 7px;
  }
  .person-notes { font-size: 11px; margin-top: 4px; }
  .person-meta { font-size: 10.5px; }

  .day-full { display: none; }
  .day-short { display: inline; }
  .cal-day-header { font-size: 12px; padding: 6px 2px; }
  .cal-hour-label { font-size: 10px; padding: 1px 4px 0 0; }

  .calendar[data-lanes="2"] .event,
  .calendar[data-lanes="3"] .event,
  .calendar[data-lanes="4"] .event { font-size: 10px; padding: 2px; }

  .calendar[data-lanes="2"] .event.ev-short .ev-code,
  .calendar[data-lanes="3"] .event.ev-short .ev-code,
  .calendar[data-lanes="4"] .event.ev-short .ev-code { display: none; }

  /* Variation: label-off at 3 lanes (≤900px already turns off lane 4) */
  .calendar[data-lanes="3"] .ev-code { display: none; }

  .campus-legend { font-size: 11px; padding: 5px 8px; gap: 4px 10px; }
  .legend-swatch { width: 16px; height: 12px; }
}

/* RESPONSIVE: VERY SMALL */
@media (max-width: 420px) {
  :root { --hour-col-w: 32px; }
  .person { flex: 1 1 100%; }
  .cal-day-header { font-size: 11px; }

  /* Variation: label-off at 2 lanes */
  .calendar[data-lanes="2"] .ev-code { display: none; }
}