/* ═══ REN CALENDAR WEB COMPONENT ═══
   A fully accessible, keyboard-navigable calendar component
   with support for single, range, and multiple date selection.
   Uses ARIA grid pattern with roving tabindex for keyboard navigation.
   ══════════════════════════════════════════════════════════════════ */

/* ═══ BASE CONTAINER ═══ */
.ren-calendar {
  container-type: inline-size;
  container-name: ren-calendar;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-4);
  font-family: inherit;
}

/* ═══ HEADER WITH NAVIGATION ═══ */
.ren-calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  gap: var(--space-2);
}

/* ═══ MONTH/YEAR TITLE ═══ */
.ren-calendar-title {
  font-size: var(--body-size);
  font-weight: var(--label-weight);
  color: var(--color-text);
  flex: 1;
  text-align: center;
  min-width: 150px;
  white-space: nowrap;
}

/* ═══ NAVIGATION BUTTONS ═══ */
.ren-calendar-nav {
  display: flex;
  gap: var(--space-1);
}

.ren-calendar-nav button {
  width: var(--touch-min);
  height: var(--touch-min);
  min-width: var(--touch-min);
  min-height: var(--touch-min);
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition-tactile);
  position: relative;

  &:hover {
    background: var(--color-fill);
  }

  &:active {
    background: var(--color-fill-active);
  }

  &:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }

  &:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
  }

  /* ═══ CHEVRON ICONS ═══ */
  &.ren-calendar-prev::before {
    content: '‹';
    font-size: 1.5em;
    font-weight: bold;
  }

  &.ren-calendar-next::before {
    content: '›';
    font-size: 1.5em;
    font-weight: bold;
  }
}

/* ═══ WEEKDAY HEADERS ═══ */
.ren-calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--space-1);
  margin-bottom: var(--space-2);
  font-size: var(--label-size);
  font-weight: var(--label-weight);
  color: var(--color-text-muted);
  text-align: center;
}

.ren-calendar-weekday {
  padding: var(--space-2) var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ═══ CALENDAR GRID ═══ */
.ren-calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--space-1);
}

/* ═══ INDIVIDUAL DAY BUTTON ═══ */
.ren-calendar-day {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: var(--touch-min);
  min-height: var(--touch-min);
  width: 100%;
  aspect-ratio: 1;
  padding: var(--space-0-5);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--body-size);
  cursor: pointer;
  transition: var(--transition-tactile);
  position: relative;

  /* ═══ DEFAULT STATE ═══ */
  &:not([disabled]):hover {
    background: var(--color-fill);
  }

  &:not([disabled]):active {
    background: var(--color-fill-active);
  }

  &:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
  }

  /* ═══ SELECTED DATE ═══ */
  &[aria-selected="true"] {
    background: var(--color-accent);
    color: var(--color-on-accent);
    font-weight: 600;
  }

  /* ═══ TODAY INDICATOR ═══ */
  &[data-today] {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
    font-weight: 600;
    box-shadow: inset 0 0 0 2px var(--color-accent);
  }

  &[data-today][aria-selected="true"] {
    background: var(--color-accent);
    color: var(--color-on-accent);
    box-shadow: none;
  }

  /* ═══ OUTSIDE MONTH DATES ═══ */
  &[data-outside] {
    color: var(--color-text-faint);
    pointer-events: none;
  }

  /* ═══ DISABLED DATES ═══ */
  &[disabled] {
    color: var(--color-text-muted);
    cursor: not-allowed;
    opacity: 0.5;
  }

  /* ═══ RANGE START ═══ */
  &.ren-calendar-day-range-start {
    background: var(--color-accent);
    color: var(--color-on-accent);
    border-radius: var(--radius-md);

    &::after {
      content: '';
      position: absolute;
      right: -4px;
      top: 0;
      bottom: 0;
      width: 50%;
      background: var(--color-accent-subtle);
      z-index: -1;
    }
  }

  /* ═══ RANGE END ═══ */
  &.ren-calendar-day-range-end {
    background: var(--color-accent);
    color: var(--color-on-accent);
    border-radius: var(--radius-md);

    &::before {
      content: '';
      position: absolute;
      left: -4px;
      top: 0;
      bottom: 0;
      width: 50%;
      background: var(--color-accent-subtle);
      z-index: -1;
    }
  }

  /* ═══ IN RANGE ═══ */
  &.ren-calendar-day-in-range {
    background: var(--color-accent-subtle);
    color: var(--color-text);
    border-radius: 0;
  }
}

/* ═══ ANIMATION FOR MONTH TRANSITIONS ═══ */
@keyframes ren-calendar-fade-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.ren-calendar-grid {
  animation: ren-calendar-fade-in var(--duration-enter) var(--ease-enter);
}

/* ═══ REDUCED MOTION SUPPORT ═══ */
@media (prefers-reduced-motion: reduce) {
  .ren-calendar-grid {
    animation: none;
  }

  .ren-calendar-nav button,
  .ren-calendar-day {
    transition: none;
  }
}

/* ═══ SIZE VARIANT: SMALL ═══ */
.ren-calendar-sm {
  padding: var(--space-3);

  .ren-calendar-header {
    margin-bottom: var(--space-3);
  }

  .ren-calendar-title {
    font-size: var(--label-size);
  }

  .ren-calendar-nav button {
    width: 36px;
    height: 36px;
    min-width: 36px;
    min-height: 36px;
  }

  .ren-calendar-weekday {
    font-size: var(--caption-size);
  }

  .ren-calendar-day {
    font-size: var(--label-size);
    min-width: 36px;
    min-height: 36px;
  }
}

/* ═══ SIZE VARIANT: LARGE ═══ */
.ren-calendar-lg {
  padding: var(--space-6);

  .ren-calendar-header {
    margin-bottom: var(--space-6);
    gap: var(--space-4);
  }

  .ren-calendar-title {
    font-size: 1.25rem;
  }

  .ren-calendar-nav button {
    width: 52px;
    height: 52px;
    min-width: 52px;
    min-height: 52px;
    font-size: 1.25rem;
  }

  .ren-calendar-weekdays {
    margin-bottom: var(--space-4);
  }

  .ren-calendar-grid {
    gap: var(--space-2);
  }

  .ren-calendar-day {
    font-size: 1.125rem;
    min-width: 52px;
    min-height: 52px;
  }
}

/* ═══ DARK MODE SUPPORT ═══ */
@media (prefers-color-scheme: dark) {
  .ren-calendar {
    /* ═══ USES CSS VARIABLES - AUTO ADAPTS ═══ */
  }
}

/* ═══ COMPACT LAYOUT (Container Query) ═══ */
@container ren-calendar (max-width: 320px) {
  .ren-calendar {
    padding: var(--space-3);
  }

  .ren-calendar-grid {
    gap: var(--space-0-5);
  }

  .ren-calendar-day {
    min-width: 32px;
    min-height: 32px;
    font-size: var(--label-size);
  }

  .ren-calendar-nav button {
    width: 40px;
    height: 40px;
    min-width: 40px;
    min-height: 40px;
  }
}
/* Appearance API bridge */
.ren-calendar {
  inline-size: var(--ren-calendar-width, 280px);
  border-radius: var(--ren-calendar-radius, var(--radius-lg));
  background: var(--ren-calendar-bg, var(--color-surface));
  border-color: var(--ren-calendar-border, var(--color-border));
}
.ren-calendar [data-day], .ren-calendar-day { inline-size: var(--ren-calendar-day-size, var(--size-md)); block-size: var(--ren-calendar-day-size, var(--size-md)); }
.ren-calendar [data-today] { background: var(--ren-calendar-today-bg, var(--color-accent-subtle)); }
.ren-calendar [aria-selected="true"], .ren-calendar [data-selected] { background: var(--ren-calendar-selected-bg, var(--color-accent)); color: var(--ren-calendar-selected-color, var(--color-on-accent)); }
.ren-calendar [data-range], .ren-calendar-range { background: var(--ren-calendar-range-bg, var(--color-accent-subtle)); }

@media (any-pointer: coarse), (pointer: coarse) {
  .ren-calendar .ren-calendar-nav button,
  .ren-calendar .ren-calendar-day {
    inline-size: calc(var(--touch-min) + var(--stroke-1));
    block-size: calc(var(--touch-min) + var(--stroke-1));
    min-inline-size: calc(var(--touch-min) + var(--stroke-1));
    min-block-size: calc(var(--touch-min) + var(--stroke-1));
  }
}