calendar/calendar.css

/* Color tokens */
:root {
  --bg: #f6f7fb;
  --panel: #fff;
  --today: #f83;
  --ink: #111;
  --ink-rgb: 17, 17, 17;
  --muted: #888;
  --weekend: #888;
  --firstday: #000;
  --select: #aaf;
  --label-bg: #fafbfe;
  --label-bg-rgb: 250, 251, 254;
}

/* Prevent text selection in calendar */
#calendar-viewport, #calendar-content, .week-row, .cell, 
.calendar-header, .week-label, .month-name-label,
.calendar-container, .jogwheel-viewport, .jogwheel-content {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

/* Month tints (light) */
.cell.dec { background: hsl(220 20% 95%) }
.cell.jan { background: hsl(220 20% 88%) }
.cell.feb { background: hsl(220 20% 95%) }
.cell.mar { background: hsl(125 60% 88%) }
.cell.apr { background: hsl(125 60% 95%) }
.cell.may { background: hsl(125 60% 88%) }
.cell.jun { background: hsl(45 85% 95%) }
.cell.jul { background: hsl(45 85% 88%) }
.cell.aug { background: hsl(45 85% 95%) }
.cell.sep { background: hsl(18 78% 88%) }
.cell.oct { background: hsl(18 78% 95%) }
.cell.nov { background: hsl(18 78% 88%) }

/* Color tokens (dark) */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: radial-gradient(1200px 800px at 20% -10%, #1c2130 0%, #0c0f16 35%, #0a0b11 100%);
    --panel: #111318;
    --today: #f83;
    --ink: #ddd;
    --ink-rgb: 221, 221, 221;
    --muted: #888;
    --weekend: #999;
    --firstday: #fff;
    --select: #44f;
    --label-bg: #1a1d25;
    --label-bg-rgb: 26, 29, 37;
  }

  /* Month tints (dark) */
  .cell.dec { background: hsl(220 20% 22%) }
  .cell.jan { background: hsl(220 20% 16%) }
  .cell.feb { background: hsl(220 20% 22%) }
  .cell.mar { background: hsl(125 40% 18%) }
  .cell.apr { background: hsl(125 40% 26%) }
  .cell.may { background: hsl(125 40% 18%) }
  .cell.jun { background: hsl(45 70% 24%) }
  .cell.jul { background: hsl(45 70% 18%) }
  .cell.aug { background: hsl(45 70% 24%) }
  .cell.sep { background: hsl(18 70% 18%) }
  .cell.oct { background: hsl(18 70% 26%) }
  .cell.nov { background: hsl(18 70% 18%) }
}

/* Layout & typography */
:root {
  --row-h: 2.2em;
  --label-w: 4em;
  --cell-w: 6em;
  --cell-h: 6em;
  --overlay-w: 3rem;
}

* { box-sizing: border-box }

body {
  margin: 0;
  font: 500 14px/1.2 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial;
  background: var(--bg);
  color: var(--ink);
}

.wrap {
  width: fit-content;
  margin: 2rem auto;
  background: var(--panel);
  height: calc(100vh - 4rem);
  display: flex;
  flex-direction: column;
  min-width: calc(var(--label-w) + 7 * var(--cell-w) + 2.4rem);
  white-space: pre-wrap;
}

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: .75rem;
  flex-shrink: 0;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.today-date {
  cursor: pointer;
}
.today-date::first-line {
  color: var(--today);
}
.today-button:hover { opacity: .8 }

.calendar-header {
  display: grid;
  grid-template-columns: var(--label-w) repeat(7, var(--cell-w)) var(--overlay-w);
  border-bottom: .1em solid var(--muted);
  align-items: last baseline;
  flex-shrink: 0;
}

.calendar-container {
  flex: 1;
  overflow: hidden;
  position: relative;
  width: 100%;
  display: flex;
}

.calendar-viewport {
  height: 100%;
  overflow-y: auto;
  overflow-x: hidden;
  flex: 0 0 auto;
  width: calc(var(--label-w) + 7 * var(--cell-w) + var(--overlay-w));
  scrollbar-width: none;
}
.calendar-viewport::-webkit-scrollbar { display: none }

.jogwheel-viewport {
  position: absolute;
  inset: 0 0 0 auto;
  width: var(--overlay-w);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
  z-index: 20;
  cursor: ns-resize;
}
.jogwheel-viewport::-webkit-scrollbar { display: none }

.jogwheel-content { position: relative; width: 100% }

.calendar-content { position: relative }

.week-row {
  display: grid;
  grid-template-columns: var(--label-w) repeat(7, var(--cell-w)) var(--overlay-w);
  position: relative;
  overflow: visible;
  height: var(--cell-h);
  scroll-snap-align: start;
}

/* Fixed heights for cells and labels */
.week-row .cell,
.week-row .week-label { height: var(--cell-h) }

header h1 { margin: 0; font-size: 1rem }

.dow-label,
.week-label {
  display: grid;
  place-items: center;
  width: var(--label-w);
  height: var(--row-h);
  color: var(--muted);
  cursor: ns-resize;
  font-size: 1.2em;
}

.dow { text-transform: uppercase; }
.cell {
  display: grid;
  place-items: center;
  width: var(--cell-w);
  height: var(--row-h);
  font-weight: 700;
  cursor: pointer;
  transition: background-color .15s ease;
}

.weekend { color: var(--weekend) }
.firstday { color: var(--firstday); text-shadow: 0 0 .1em rgba(var(--ink-rgb), .5) }

.today h1 {
  border-radius: 2em;
  border: .2em dotted var(--today);
  margin: -.2em;
}

/* Selection */
input {
  background: transparent;
  border: none;
  color: var(--ink);
  width: 11em;
}
label:has(input[value]) {
  display: block;
}
.selected {
  background: var(--select) !important;
}
.selected h1,
:is(.range-start,.range-end,.range-middle,.range-single) h1 {
  background: transparent !important;
  color: var(--panel) !important;
  font-weight: 700;
}

.cell {
  position: relative;
}

.cell h1 {
  position: absolute;
  top: 0;
  left: 0;
  padding: .25em;
  margin: 0;
  transition: background-color .15s ease;
  font-size: 1em;
}
.cell:hover h1 { text-shadow: 0 0 .2em; }

/* Month labels in jogwheel column */
.month-name-label {
  grid-column: -2 / -1;
  font-size: 2em;
  font-weight: 700;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 15;
  overflow: visible;
  position: absolute;
  top: 0;
  right: 0;
  width: var(--overlay-w);
}

.month-name-label > span {
  display: inline-block;
  white-space: nowrap;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  transform-origin: center;
}