:root {
  --bg: #f6f6f3;
  --surface: #fffefd;
  --text: #20262b;
  --muted: #73706a;
  --border: #e2dfd7;
  --button-hover: #f1f0ec;
  --control-text: #3d4246;
  --export-fill: #b3a369;
  --export-hover: #a89652;
  --navy: #003057;
  --blue-soft: #e9eff4;
  --holiday-fill: #efe4a9;
  --reading-fill: #e2dff0;
  --final-fill: #e2b6b0;
  --recess-fill: #d9eadc;
  --spring: #eef7f0;
  --spring-strong: #cfe8d4;
  --summer: #fbf2c9;
  --summer-strong: #e6d173;
  --summer-maymester: #f8e4d1;
  --summer-maymester-strong: #e9b57a;
  --summer-early: #edf3d6;
  --summer-early-strong: #c5d883;
  --summer-late: #dfedf0;
  --summer-late-strong: #91c6cd;
  --fall: #f3e8df;
  --fall-strong: #d8b69e;
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

button,
input {
  font: inherit;
}

button {
  outline: none;
}

.app-shell {
  display: grid;
  grid-template-columns: 272px minmax(0, 1fr);
  grid-template-rows: 64px minmax(0, calc(100vh - 64px));
  min-height: 100vh;
}

.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 10px 18px;
  background: var(--surface);
}

.brand {
  min-width: 210px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 17px;
  line-height: 1.15;
  font-weight: 700;
}

.brand p {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.3;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  min-width: 0;
}

.view-switch {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 132px;
  height: 32px;
  padding: 2px;
  background: #e9e8e4;
  border-radius: 999px;
}

.view-switch::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: calc(50% - 2px);
  height: calc(100% - 4px);
  border-radius: inherit;
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(32, 38, 43, 0.12);
  transform: translateX(0);
  transition: transform 180ms ease;
}

.view-switch:has(.switch-button[data-view="month"].is-active)::before {
  transform: translateX(100%);
}

.switch-button,
.icon-button,
.action-button {
  border-radius: 6px;
  border: 0;
  min-height: 32px;
  cursor: pointer;
}

.switch-button {
  position: relative;
  z-index: 1;
  min-height: 24px;
  padding: 0 10px;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  transition: color 160ms ease;
}

.switch-button:hover,
.switch-button.is-active {
  color: var(--control-text);
}

.icon-button {
  width: 32px;
  display: grid;
  place-items: center;
  background: var(--surface);
  color: var(--control-text);
  transition: background 140ms ease;
}

.icon-button:hover {
  background: var(--button-hover);
}

.help-button {
  font-weight: 700;
  line-height: 1;
}

.help-popover-anchor {
  position: relative;
  display: inline-flex;
}

.help-popover {
  position: absolute;
  top: calc(100% + 10px);
  right: -8px;
  z-index: 40;
  width: min(360px, calc(100vw - 28px));
  background: var(--surface);
  border-radius: 8px;
  box-shadow: 0 12px 28px rgba(32, 38, 43, 0.12);
}

.help-popover::before,
.help-popover::after {
  content: "";
  position: absolute;
  right: 18px;
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
}

.help-popover::before {
  top: -9px;
  border-bottom: 9px solid var(--surface);
}

.help-popover::after {
  top: -8px;
  border-bottom: 9px solid var(--surface);
}

.popover-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 11px;
}

.popover-header h2 {
  font-size: 15px;
  line-height: 1.2;
}

.popover-close {
  flex: 0 0 auto;
  width: 28px;
  min-height: 28px;
}

.popover-close svg {
  width: 16px;
  height: 16px;
}

.popover-content {
  display: grid;
  gap: 10px;
  padding: 12px;
}

.popover-content p {
  color: #3d4246;
  font-size: 12px;
  line-height: 1.45;
}

.popover-lede {
  color: var(--text);
  font-weight: 600;
}

.popover-section {
  display: grid;
  gap: 5px;
  padding-top: 8px;
}

.popover-section h3 {
  margin: 0;
  color: var(--control-text);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.2;
  text-transform: uppercase;
}

.popover-section ul {
  display: grid;
  gap: 4px;
  margin: 0;
  padding-left: 17px;
  color: #3d4246;
  font-size: 12px;
  line-height: 1.45;
}

.popover-section a {
  color: var(--navy);
  text-decoration: none;
  font-weight: 600;
}

.popover-section a:hover {
  text-decoration: underline;
}

.popover-credit {
  color: var(--muted);
  font-size: 11px;
}

.popover-credit a {
  color: var(--navy);
  text-decoration: none;
  font-weight: 600;
}

.popover-credit a:hover {
  text-decoration: underline;
}

.icon-button svg,
.action-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 12px;
  background: var(--surface);
  color: var(--control-text);
  font-size: 13px;
  font-weight: 600;
  transition: background 140ms ease;
}

.action-button#export-ics {
  background: var(--export-fill);
  color: var(--text);
}

.action-button:hover {
  background: var(--button-hover);
}

.action-button#export-ics:hover {
  background: var(--export-hover);
}

.filters {
  overflow: auto;
  padding: 16px 14px;
  background: var(--surface);
}

.filter-section {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  padding: 0 0 14px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

.filter-section:last-child {
  border-bottom: 0;
}

.section-title {
  flex-basis: 100%;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
}

.toggle-option,
.radio-row {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
}

.toggle-option input,
.radio-row input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
}

.toggle-option span,
.radio-row span {
  display: inline-flex;
  align-items: center;
  min-height: 27px;
  padding: 0 8px;
  border-radius: 6px;
  color: #3d4246;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  transition: background 140ms ease, color 140ms ease;
}

.toggle-option input:checked + span,
.radio-row input:checked + span {
  color: var(--control-text);
}

.toggle-option input:focus-visible + span,
.radio-row:focus-within {
  outline: none;
}

.toggle-option:not(:has(input:checked)) span,
.radio-row:not(:has(input:checked)) span {
  color: var(--muted);
}

.toggle-option:hover span,
.radio-row:hover span,
.toggle-option:hover input:checked + span,
.radio-row:hover input:checked + span {
  background: var(--button-hover);
}

.radio-row input:checked + span {
  background: #f3efd8;
}

.toggle-types.toggle-holiday input:checked + span { background: var(--holiday-fill); }
.toggle-types.toggle-reading-period input:checked + span { background: var(--reading-fill); }
.toggle-types.toggle-final-exams input:checked + span { background: var(--final-fill); }
.toggle-types.toggle-recess input:checked + span { background: var(--recess-fill); }
.toggle-types.toggle-commencement input:checked + span { background: #f0e8cf; }
.toggle-types.toggle-classes input:checked + span,
.toggle-types.toggle-minimester input:checked + span,
.toggle-types.toggle-half-term input:checked + span { background: var(--blue-soft); }
.toggle-types.toggle-registration input:checked + span,
.toggle-types.toggle-withdrawal input:checked + span,
.toggle-types.toggle-payment input:checked + span,
.toggle-types.toggle-grades input:checked + span,
.toggle-types.toggle-thesis input:checked + span,
.toggle-types.toggle-readmission input:checked + span,
.toggle-types.toggle-faculty input:checked + span { background: #eef1f4; }

.toggle-terms.toggle-spring-full input:checked + span { background: var(--spring); }
.toggle-terms.toggle-summer-full input:checked + span { background: var(--summer); }
.toggle-terms.toggle-summer-maymester input:checked + span { background: var(--summer-maymester); }
.toggle-terms.toggle-summer-early input:checked + span { background: var(--summer-early); }
.toggle-terms.toggle-summer-late input:checked + span { background: var(--summer-late); }
.toggle-terms.toggle-fall-full input:checked + span { background: var(--fall); }

.calendar-panel {
  overflow: auto;
  padding: 20px;
}

.year-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(240px, 1fr));
  gap: 14px;
}

.month-grid {
  display: grid;
  grid-template-columns: minmax(760px, 1fr);
}

#period-title {
  margin-bottom: 12px;
  font-size: 21px;
  line-height: 1.1;
  font-weight: 700;
}

.month {
  min-width: 0;
  background: var(--surface);
  border-radius: 8px;
  overflow: hidden;
}

.month h3 {
  display: flex;
  align-items: center;
  min-height: 34px;
  margin: 0;
  padding: 0 11px;
  font-size: 14px;
  font-weight: 700;
}

.weekdays,
.week-days,
.week-events {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
}

.weekday {
  display: grid;
  place-items: center;
  height: 22px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
}

.weeks {
  display: grid;
}

.week {
  position: relative;
  min-width: 0;
}

.week-days {
  min-width: 0;
}

.week-events {
  position: absolute;
  top: 25px;
  left: 0;
  right: 0;
  z-index: 2;
  grid-auto-rows: 16px;
  row-gap: 2px;
  padding: 0 4px;
  pointer-events: none;
}

.month-grid .week-events {
  top: 30px;
  grid-auto-rows: 19px;
  row-gap: 3px;
  padding: 0 6px;
}

.day {
  position: relative;
  min-width: 0;
  height: 74px;
  padding: 5px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: #fffefd;
}

.month-grid .day {
  height: 116px;
}

.day:nth-child(7n) {
  border-right: 0;
}

.week:last-child .day {
  border-bottom: 0;
}

.day.is-muted,
.day.is-outside-month {
  background: #f4f3ef;
  color: #aaa59c;
}

.day.is-muted .day-number {
  color: #aaa59c;
}

.day.is-outside-month {
  cursor: pointer;
}

.calendar-panel:has(.day.is-outside-month:hover) .day.is-outside-month,
.calendar-panel:has(.day.is-outside-month:focus-visible) .day.is-outside-month,
.calendar-panel:has(.event-outside-month:hover) .day.is-outside-month {
  filter: saturate(0.85) brightness(0.98);
}

.day.is-today {
  background: #fbf5d8;
}

.day-number {
  display: block;
  margin-bottom: 3px;
  font-size: 11px;
  font-weight: 500;
  color: #2c3135;
}

.day.is-today .day-number {
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
}

.event-pill {
  min-width: 0;
  width: calc(100% - 2px);
  margin: 0 1px;
  padding: 2px 5px;
  border-radius: 4px;
  background: #eef1f4;
  overflow: hidden;
  color: #2b3034;
  font-size: 10px;
  line-height: 1.2;
  white-space: nowrap;
  text-overflow: ellipsis;
  cursor: default;
  pointer-events: auto;
  transition: opacity 120ms ease, transform 120ms ease, box-shadow 120ms ease, font-weight 120ms ease;
}

.event-pill.is-type-hovered {
  opacity: 1;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(32, 38, 43, 0.16);
}

.event-pill.event-outside-month {
  opacity: 0.58;
  filter: saturate(0.5) brightness(1.06);
}

.event-pill.event-preview {
  opacity: 0.72;
}

.event-pill.event-preview.is-type-hovered {
  opacity: 1;
}

.calendar-panel:has(.day.is-outside-month:hover) .event-outside-month,
.calendar-panel:has(.day.is-outside-month:focus-visible) .event-outside-month,
.calendar-panel:has(.event-outside-month:hover) .event-outside-month {
  opacity: 0.82;
}

.day.is-type-hovered {
  z-index: 3;
  filter: saturate(1.35) brightness(0.96);
}

.day.is-type-dimmed {
  opacity: 0.42;
}

.event-pill.is-type-dimmed {
  opacity: 0.32;
}

.month-grid .event-pill {
  font-size: 11px;
  padding: 3px 5px;
}

.event-classes,
.event-minimester,
.event-half-term { background: var(--blue-soft); }
.event-commencement { background: #f0e8cf; }

.week-more {
  grid-column: 1 / -1;
  min-width: 0;
  padding-left: 5px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.2;
  font-weight: 600;
  pointer-events: none;
}

.tooltip {
  position: fixed;
  z-index: 20;
  display: none;
  max-width: 280px;
  padding: 9px 10px;
  background: var(--surface);
  color: var(--text);
  border-radius: 6px;
  box-shadow: 0 10px 24px rgba(32, 38, 43, 0.14);
  font-size: 12px;
  line-height: 1.35;
  pointer-events: none;
}

.tooltip strong {
  display: block;
  margin-bottom: 3px;
}

.tooltip span {
  color: var(--muted);
}

.tooltip-date {
  margin-bottom: 6px;
  font-weight: 700;
}

.tooltip-event {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 7px;
  align-items: start;
}

.tooltip-swatch {
  width: 10px;
  height: 10px;
  margin-top: 2px;
  border-radius: 2px;
}

.tooltip ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.tooltip li + li {
  margin-top: 7px;
  padding-top: 7px;
  border-top: 1px solid var(--border);
}

.tooltip li strong {
  margin-bottom: 2px;
}

@media (max-width: 1120px) {
  .app-shell {
    grid-template-columns: 250px minmax(0, 1fr);
  }

  .year-grid {
    grid-template-columns: repeat(2, minmax(240px, 1fr));
  }
}

@media (max-width: 760px) {
  .app-shell {
    display: block;
  }

  .topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    align-items: flex-start;
    flex-direction: column;
  }

  .toolbar {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .help-popover {
    left: -48px;
    right: auto;
  }

  .help-popover::before,
  .help-popover::after {
    left: 56px;
    right: auto;
  }

  .filters {
    padding-top: 14px;
  }

  .year-grid,
  .month-grid {
    grid-template-columns: minmax(280px, 1fr);
  }
}