/* kalender.css — Mobil Stacked Tages-Sections als Akkordeon (prototype/kurse.html)
 * Zweck: <768px (v. a. <430px) ersetzt das 7-Spalten-Desktop-Grid (JD2) eine stacked
 *        Card-Liste: 7 Tages-Sections (Mo–So) mit farbcodiertem sticky Header + Akkordeon.
 *        Kein Horizontal-Scroll, Touch-Target ≥44px, heute default offen.
 * SSOT:  js/kalender-render.js baut die .cal-mobile*-DOM. Diese Datei stylen.
 *
 * Wiederverwendbarkeit: Wochentags-Farben = zentrale :root-Tokens --day-montag … --day-sonntag
 *        + --day-text (style.css). Fallback-BG #f5f5f5 (nie transparent), Fallback-Text #1A365D.
 * Koordination JD2: Desktop-Grid (.calendar-grid) bleibt unangetastet; Mobile wird per
 *        .cal-mobile-only (visible <768px, hidden ≥768px) getrennt. Kein Horizontal-Scroll.
 *
 * Akkordeon-Mechanik: .cal-mobile-section.is-open → body max-height sichtbar;
 *        chevron rotiert; aria-expanded steuert ARIA (JS in kalender-render.js).
 */

/* ============================================================================
   MOBILE STACKED TAGES-SECTIONS (Akkordeon) — <768px
   ========================================================================== */
@media (max-width: 768px) {

  /* Desktop-Grid (JD2) ausblenden, Mobile-Container sichtbar machen.
     .calendar-container/.cal-day: Desktop-DOM aus kalender-render.js (renderDesktop),
     sonst Duplikat neben dem Akkordeon (QualityGuard WARNING mobile <768px). */
  .calendar-grid,
  .calendar-container,
  .cal-day {
    display: none;
  }
  .cal-mobile {
    display: block;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden; /* kein Horizontal-Scroll */
    box-sizing: border-box;
  }

  /* --- Tages-Section (Card) --- */
  .cal-mobile-section {
    background: var(--color-neutral, #F9FAFB);
    border: 1px solid var(--color-border, #E5E7EB);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  }
  .cal-mobile-section.is-today {
    border-color: var(--color-primary, #1A365D);
    box-shadow: 0 0 0 2px rgba(26, 54, 93, 0.12);
  }

  /* --- Tages-Header: sticky, farbcodiert, Touch-Target ≥44px --- */
  .cal-mobile-dayhead {
    position: sticky;
    top: 48px; /* unter Filter-Leiste */
    z-index: 5;
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    min-height: 48px; /* ≥44px Touch-Target (Accessibility) */
    padding: 10px 14px;
    border: 0;
    cursor: pointer;
    text-align: left;
    font: inherit;
    font-weight: 700;
    background: var(--day-bg, #f5f5f5); /* Fallback #f5f5f5 (nie transparent) */
    color: var(--day-text, #1A365D);
    transition: background 0.15s ease, filter 0.15s ease;
  }
  .cal-mobile-dayhead:active { filter: brightness(0.97); }
  .cal-mobile-dayhead:focus-visible {
    outline: 3px solid var(--color-primary, #1A365D);
    outline-offset: -3px;
  }

  /* Wochentags-Farbcodes (Mo–So) — zentral: :root --day-montag … --day-sonntag + --day-text (style.css). */
  .cal-mobile-section[data-day="Montag"]     .cal-mobile-dayhead { --day-bg: var(--day-montag, #f5f5f5); }
  .cal-mobile-section[data-day="Dienstag"]   .cal-mobile-dayhead { --day-bg: var(--day-dienstag, #f5f5f5); }
  .cal-mobile-section[data-day="Mittwoch"]   .cal-mobile-dayhead { --day-bg: var(--day-mittwoch, #f5f5f5); }
  .cal-mobile-section[data-day="Donnerstag"] .cal-mobile-dayhead { --day-bg: var(--day-donnerstag, #f5f5f5); }
  .cal-mobile-section[data-day="Freitag"]    .cal-mobile-dayhead { --day-bg: var(--day-freitag, #f5f5f5); }
  .cal-mobile-section[data-day="Samstag"]    .cal-mobile-dayhead { --day-bg: var(--day-samstag, #f5f5f5); }
  .cal-mobile-section[data-day="Sonntag"]    .cal-mobile-dayhead { --day-bg: var(--day-sonntag, #f5f5f5); }

  .cal-mobile-dayname {
    flex: 1 1 auto;
    font-size: 1.02rem;
    letter-spacing: 0.01em;
  }

  /* Anzahl-Events-Badge im Header. */
  .cal-mobile-count {
    flex: 0 0 auto;
    min-width: 26px;
    height: 26px;
    padding: 0 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
    background: rgba(255, 255, 255, 0.7);
    color: var(--day-text, #1A365D);
    border: 1px solid rgba(0, 0, 0, 0.08);
  }

  /* Chevron (rotiert bei offen). */
  .cal-mobile-chevron {
    flex: 0 0 auto;
    width: 10px;
    height: 10px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.2s ease;
    opacity: 0.7;
  }
  .cal-mobile-section.is-open .cal-mobile-chevron {
    transform: rotate(225deg);
  }

  /* --- Akkordeon-Body (collapse/expand) --- */
  .cal-mobile-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .cal-mobile-section.is-open .cal-mobile-body {
    max-height: 2000px; /* großzügig für lange Taglisten */
  }

  /* --- Event-Card-Liste --- */
  .cal-mobile-list {
    list-style: none;
    margin: 0;
    padding: 8px 10px 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .cal-mobile-item {
    border: 1px solid var(--color-border, #E5E7EB);
    border-radius: 10px;
    background: #fff;
  }
  .cal-mobile-link {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    padding: 10px 12px;
    min-height: 44px; /* Touch-Target */
    text-decoration: none;
    color: var(--color-text, #111827);
    background: #fff;
    border-radius: 10px;
  }
  .cal-mobile-link:active { background: var(--color-neutral, #F9FAFB); }
  .cal-mobile-link:focus-visible {
    outline: 3px solid var(--color-primary, #1A365D);
    outline-offset: 2px;
  }

  .cal-mobile-time {
    flex: 0 0 auto;
    font-variant-numeric: tabular-nums;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--color-primary, #1A365D);
    min-width: 58px;
  }
  .cal-mobile-body { display: flex; flex-direction: column; gap: 2px; flex: 1 1 auto; min-width: 0; }
  .cal-mobile-name {
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.25;
    overflow-wrap: anywhere;
  }
  .cal-mobile-loc {
    font-size: 0.82rem;
    color: var(--color-muted, #6B7280);
    line-height: 1.3;
    overflow-wrap: anywhere;
  }
  .cal-mobile-badge {
    display: inline-block;
    margin-top: 4px;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 600;
    background: var(--color-neutral, #F9FAFB);
    color: var(--color-text, #111827);
    border: 1px solid var(--color-border, #E5E7EB);
    width: fit-content;
  }

  /* --- Edge Case: alle Tage leer (gefiltert) --- */
  .cal-mobile-empty {
    margin: 0;
    padding: 18px 14px;
    font-size: 0.92rem;
    color: var(--color-muted, #6B7280);
    text-align: center;
  }
}

/* ============================================================================
   ≥768px: Mobile-Container ausblenden (Desktop-Grid JD2 aktiv)
   ========================================================================== */
@media (min-width: 769px) {
  .cal-mobile {
    display: none;
  }
}