/* ==========================================================================
   78 UI Kit — FullCalendar theme adapter
   Primary target: FullCalendar **7.x core** (verified against 7.0.2, classic
   theme). A legacy v6 block follows at the bottom. MIT, not vendored.
   ⚠️ Core only — nothing here assumes a premium plugin.

   Opt-in — NOT imported by kit.css. Load FullCalendar's own CSS first, this
   after:

     <link rel="stylesheet" href="…/fullcalendar@7/skeleton.css">
     <link rel="stylesheet" href="…/fullcalendar@7/themes/classic/theme.css">
     <link rel="stylesheet" href="…/fullcalendar@7/themes/classic/palette.css">
     <link rel="stylesheet" href="/78UIKit/css/adapters/fullcalendar.css">
     <script src="…/fullcalendar@7/all/global.min.js"></script>
     <script src="…/fullcalendar@7/themes/classic/global.js"></script>

   🔴 Why this file is only variables now. v7 ships **hashed atomic class
   names** — the calendar root looks like `fc-classic-dl1 fc-classic-1sP …`,
   and those strings change between builds. Class-level overrides are
   therefore off the table; the palette custom properties are the whole
   supported theming surface, and they are all this adapter touches. That is
   also why the mapping below is per-theme: the variables are named for the
   theme that defines them (`--fc-classic-*` for `themes/classic`, the closest
   to a plain calendar).

   Everything resolves at runtime, so the calendar re-themes the instant
   `data-theme` flips — no JS, no re-render.
   ========================================================================== */

/* --- v7: remap the classic palette onto kit tokens ------------------------
   The second selector covers a consumer who has opted into FullCalendar's own
   `data-color-scheme` switching: v7 redefines its palette there, and a
   declaration on a closer element would otherwise beat one on :root.
   -------------------------------------------------------------------------- */
:root,
[data-color-scheme] {
  /* Surfaces. faint/muted/strong are washes v7 composites over the
     background; kit surfaces are opaque, which composites to themselves. */
  --fc-classic-background: var(--bg2);
  --fc-classic-faint: var(--bg3);
  --fc-classic-muted: var(--bg3);
  --fc-classic-strong: var(--row-hover);

  /* Text */
  --fc-classic-foreground: var(--text);
  --fc-classic-muted-foreground: var(--dim);
  --fc-classic-faint-foreground: var(--dim);   /* other-month day numbers */

  /* Grid lines */
  --fc-classic-border: var(--border);
  --fc-classic-strong-border: var(--border);
  --fc-classic-border-style: solid;

  /* Toolbar buttons. One foreground token has to read on both the resting
     and the pressed background, so the pressed state is an accent *tint*
     with an accent border — the kit's own ghost-button treatment — rather
     than a solid fill that would need its own text color. */
  --fc-classic-button: var(--bg3);
  --fc-classic-button-border: var(--border);
  --fc-classic-button-foreground: var(--text);
  --fc-classic-button-strong: var(--accent-lo);
  --fc-classic-button-strong-border: var(--accent);
  --fc-classic-button-outline: var(--ring);

  /* Focus / selection */
  --fc-classic-primary: var(--accent);
  --fc-classic-primary-foreground: var(--accent-text);
  --fc-classic-ring-color: var(--bg2);         /* halo behind dots + badges */

  /* Events. The classic theme plugin sets eventColor to
     var(--fc-classic-event), so these two are what color an event; an
     event's own `color` still overrides them per event. */
  --fc-classic-event: var(--accent);
  --fc-classic-event-contrast: var(--accent-text);
  --fc-classic-background-event: var(--success);

  /* State */
  --fc-classic-today: var(--accent-lo);
  --fc-classic-highlight: var(--accent-lo);
  --fc-classic-now: var(--danger);
}

/* ==========================================================================
   LEGACY — FullCalendar 6.x core (verified against 6.1.21)
   v6 resolved every color through its own `--fc-*` variables and used stable
   class names, so it gets both a remap and a handful of class rules. Keep
   this block for projects still on v6; v7 is the tested path.
   ⚠️ v7 removed every `--fc-*` name below — the two blocks do not overlap,
   so this is inert on a v7 page (and vice versa).
   ========================================================================== */
.fc {
  /* surfaces + lines */
  --fc-page-bg-color: var(--bg2);
  --fc-neutral-bg-color: var(--bg3);
  --fc-neutral-text-color: var(--dim);
  --fc-border-color: var(--border);

  /* toolbar buttons */
  --fc-button-text-color: var(--text);
  --fc-button-bg-color: var(--bg3);
  --fc-button-border-color: var(--border);
  --fc-button-hover-bg-color: var(--row-hover);
  --fc-button-hover-border-color: var(--dim);
  --fc-button-active-bg-color: var(--accent);
  --fc-button-active-border-color: var(--accent);

  /* events */
  --fc-event-bg-color: var(--accent);
  --fc-event-border-color: var(--accent);
  --fc-event-text-color: var(--accent-text);
  --fc-event-selected-overlay-color: var(--accent-lo);
  --fc-bg-event-color: var(--success);
  --fc-bg-event-opacity: .18;

  /* state */
  --fc-today-bg-color: var(--accent-lo);
  --fc-highlight-color: var(--accent-lo);
  --fc-now-indicator-color: var(--danger);
  --fc-non-business-color: var(--bg3);

  /* list view + "+2 more" links */
  --fc-list-event-hover-bg-color: var(--row-hover);
  --fc-more-link-bg-color: var(--accent-lo);
  --fc-more-link-text-color: var(--accent);

  /* type */
  font-family: var(--font);
  font-size: var(--fs-base);
  color: var(--text);
}

/* The bits v6 hardcodes or leaves to the host page */
.fc .fc-toolbar-title {
  font-size: var(--fs-xl);
  font-weight: 600;
  color: var(--text);
}
.fc .fc-toolbar.fc-header-toolbar { margin-bottom: var(--space-4); }

.fc .fc-button {
  border-radius: var(--radius);
  font-size: var(--fs-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.fc .fc-button-primary:focus,
.fc .fc-button-primary:not(:disabled).fc-button-active:focus,
.fc .fc-button-primary:not(:disabled):active:focus { box-shadow: 0 0 0 var(--ring-w) var(--ring); }
.fc .fc-button-primary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.fc .fc-button-primary:disabled { opacity: .5; }
.fc .fc-button-primary:not(:disabled).fc-button-active,
.fc .fc-button-primary:not(:disabled):active { color: var(--accent-text); }

.fc .fc-scrollgrid,
.fc .fc-scrollgrid-section > * { border-color: var(--border); }
.fc .fc-scrollgrid { border-radius: var(--radius); overflow: hidden; }
.fc .fc-col-header-cell {
  background: var(--bg3);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.fc .fc-col-header-cell-cushion { color: var(--dim); padding: var(--space-2); }
.fc .fc-col-header-cell-cushion:hover { color: var(--text); }

.fc .fc-daygrid-day-number,
.fc .fc-list-day-text,
.fc .fc-list-day-side-text {
  color: var(--text);
  text-decoration: none;
}
.fc .fc-day-other .fc-daygrid-day-top { opacity: 1; }        /* opacity → a real token */
.fc .fc-day-other .fc-daygrid-day-number { color: var(--dim); }
.fc .fc-day-today .fc-daygrid-day-number { color: var(--accent); font-weight: 700; }
.fc .fc-daygrid-day.fc-day-today { background-color: var(--accent-lo); }

.fc .fc-timegrid-slot-label-cushion,
.fc .fc-timegrid-axis-cushion {
  color: var(--dim);
  font-size: var(--fs-xs);
}
.fc .fc-timegrid-now-indicator-arrow,
.fc .fc-timegrid-now-indicator-line { border-color: var(--danger); }

.fc .fc-event {
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-weight: 500;
}
.fc .fc-event:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.fc .fc-daygrid-dot-event { color: var(--text); }
.fc .fc-daygrid-dot-event:hover { background: var(--row-hover); }
.fc .fc-daygrid-event-dot { border-color: var(--accent); }
.fc .fc-list-event-dot { border-color: var(--accent); }
.fc .fc-event-title-container .fc-event-title { font-weight: 500; }

.fc .fc-list { border-color: var(--border); border-radius: var(--radius); }
.fc .fc-list-day-cushion { background: var(--bg3); }
.fc .fc-list-event td { color: var(--text); }
.fc .fc-list-empty { background: var(--bg3); color: var(--dim); }

.fc .fc-popover {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}
.fc .fc-popover-title { color: var(--text); font-weight: 600; }
.fc .fc-popover-close { color: var(--dim); opacity: 1; }
.fc .fc-popover-close:hover { color: var(--text); }

.fc .fc-highlight { background: var(--accent-lo); }
.fc a { color: inherit; }
.fc a:hover { text-decoration: none; }