/* ===========================================================
   Calendar view — 萬年曆視圖（仿 somananda /upcoming-courses/month）
   三欄：sidebar(240) + 主月曆
   =========================================================== */

/* ---------- Layout ---------- */
.page-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-6) var(--space-5) var(--space-8);
}

@media (min-width: 960px) {
  .page-layout {
    grid-template-columns: 240px 1fr;
    gap: var(--space-7);
  }
}

/* ---------- Sidebar ---------- */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.sidebar__block {
  background: var(--color-bg-primary);
}

.sidebar__heading {
  font-family: var(--font-serif);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border-soft);
}

.sidebar__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.sidebar__list li {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.sidebar__list li::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border);
  transition: background var(--transition-fast);
}
.sidebar__list li:hover,
.sidebar__list li.is-active {
  color: var(--color-accent-primary);
}
.sidebar__list li:hover::before,
.sidebar__list li.is-active::before {
  background: var(--color-accent-primary);
}

.sidebar__trusted {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}
.sidebar__trusted-item {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  padding: var(--space-3);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  text-align: center;
  letter-spacing: 0.05em;
}

/* ---------- Calendar main ---------- */
.calendar-main {
  min-width: 0;
}

/* ---------- Toolbar ---------- */
.calendar-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border-soft);
}

.calendar-toolbar__current {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  transition: all var(--transition-base);
}
.calendar-toolbar__current:hover {
  background: var(--color-accent-bg);
  color: var(--color-accent-primary);
}

.calendar-toolbar__nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
  font-size: var(--fs-md);
  line-height: 1;
}
.calendar-toolbar__nav:hover {
  background: var(--color-accent-primary);
  color: var(--color-text-inverse);
}
.calendar-toolbar__nav:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  background: var(--color-bg-secondary);
  color: var(--color-text-muted);
}

.calendar-toolbar__label {
  font-family: var(--font-serif);
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
  letter-spacing: 0.01em;
  margin: 0 var(--space-2);
  flex: 1;
  min-width: 160px;
}

.calendar-toolbar .view-toggle {
  margin: 0;
}

/* ---------- Grid ---------- */
.calendar-grid {
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-primary);
}

.calendar-grid__weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-soft);
}
.calendar-grid__weekday {
  padding: var(--space-3) var(--space-2);
  text-align: center;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--color-text-muted);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.calendar-grid__weeks {
  display: flex;
  flex-direction: column;
}

.calendar-week {
  position: relative;
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  border-top: 1px solid var(--color-border-soft);
}
.calendar-week:first-child {
  border-top: none;
}

.calendar-day {
  position: relative;
  min-height: 110px;
  padding: var(--space-2);
  border-right: 1px solid var(--color-border-soft);
  background: var(--color-bg-primary);
  transition: background var(--transition-fast);
  overflow: hidden;
}
.calendar-day:last-child {
  border-right: none;
}
.calendar-day:hover {
  background: var(--color-accent-bg);
}

.calendar-day--out {
  background: var(--color-bg-secondary);
  color: var(--color-text-muted);
}
.calendar-day--out:hover {
  background: var(--color-bg-secondary);
}
.calendar-day--past .calendar-day__num {
  color: var(--color-text-muted);
  opacity: 0.55;
}
.calendar-day--today {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: -2px;
}
.calendar-day--today .calendar-day__num {
  color: var(--color-accent-primary);
  font-weight: var(--fw-bold);
}

.calendar-day__num {
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

/* ---------- Course bar (overlay on the week row) ---------- */
.course-bar {
  position: absolute;
  top: 26px;            /* leave room for day number */
  height: 22px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--color-text-inverse);
  line-height: 22px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  transition: transform var(--transition-fast), filter var(--transition-fast);
  box-shadow: 0 1px 2px rgba(58, 42, 22, 0.18);
  z-index: 2;
}
.course-bar:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
  z-index: 3;
}

.course-bar--primary {
  background: rgba(171, 129, 72, 0.92);   /* 金棕 */
}
.course-bar--soft {
  background: rgba(106, 127, 110, 0.92);  /* 莫蘭迪綠 */
}
.course-bar--warm {
  background: rgba(140, 105, 54, 0.92);   /* 金棕深 */
}

/* offset stacking — 同一週多筆課程錯開 */
.course-bar[data-row="0"] { top: 26px; }
.course-bar[data-row="1"] { top: 52px; }
.course-bar[data-row="2"] { top: 78px; }

/* Mobile tweaks */
@media (max-width: 720px) {
  .calendar-day {
    min-height: 78px;
    padding: 4px;
  }
  .calendar-day__num {
    font-size: 10px;
  }
  .course-bar {
    height: 16px;
    line-height: 16px;
    font-size: 10px;
    top: 22px;
  }
  .course-bar[data-row="0"] { top: 22px; }
  .course-bar[data-row="1"] { top: 40px; }
  .course-bar[data-row="2"] { top: 58px; }
  .calendar-toolbar__label {
    font-size: var(--fs-lg);
    flex-basis: 100%;
    order: 5;
    text-align: center;
  }
}