/* ==========================================================================
   CALENDAR SYSTEM: 7-DAY WEEKLY GRID, MONTHLY & CUATRIMESTRAL VIEWS
   Agenda Semanal
   ========================================================================== */

/* Calendar View Container */
.calendar-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-app);
}

/* Calendar Sub-view Switcher Header */
.calendar-top-bar {
  flex-shrink: 0;
  padding: 10px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background-color: var(--bg-app);
  border-bottom: 1px solid var(--border-subtle);
  z-index: var(--z-sticky-header);
}

.calendar-nav-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.calendar-period-label {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  text-align: center;
  flex: 1;
}

.calendar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================================================
   WEEKLY 7-DAY GRID (CORE ENGINE)
   - 7 real day columns
   - Mobile: 3 visible days with scroll snap
   - Sticky hour column on the left
   - Sticky day header on top
   - Scrollable vertically (06:00 to 00:00) and horizontally simultaneously
   ========================================================================== */

.week-grid-scroller {
  flex: 1;
  overflow-x: auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x mandatory;
  position: relative;
  width: 100%;
  height: 100%;
  background-color: var(--bg-app);
  scrollbar-width: thin;
}

/* Grid Table-like Layout */
.week-grid {
  display: flex;
  min-width: 100%;
  /* 7 columns. On mobile, each column is calc((100vw - 48px) / 3) so 3 columns fit exactly */
  width: calc(var(--cal-hour-col-width) + ((100vw - var(--cal-hour-col-width)) / 3) * 7);
  position: relative;
}

@media (min-width: 768px) {
  .week-grid-scroller {
    scroll-snap-type: none; /* Free scroll or fit all 7 on larger screens */
  }
  .week-grid {
    width: 100%;
    min-width: 700px;
  }
}

/* --- Sticky Time / Hours Column --- */
.time-col {
  flex: 0 0 var(--cal-hour-col-width);
  width: var(--cal-hour-col-width);
  position: sticky;
  left: 0;
  z-index: var(--z-sticky-hour);
  background-color: var(--bg-app);
  border-right: 1px solid var(--border-subtle);
  user-select: none;
  -webkit-user-select: none;
}

.time-col-corner {
  position: sticky;
  top: 0;
  height: var(--cal-header-height);
  background-color: var(--bg-app);
  border-bottom: 1px solid var(--border-subtle);
  z-index: var(--z-sticky-corner);
}

.time-slot-label {
  height: var(--cal-hour-height);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 4px;
  font-size: 11px;
  font-weight: var(--font-weight-medium);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  border-bottom: 1px solid transparent;
  transform: translateY(-8px);
}

/* --- Days Container --- */
.days-container {
  flex: 1;
  display: flex;
  position: relative;
}

/* Individual Day Column */
.day-col {
  flex: 0 0 calc((100vw - var(--cal-hour-col-width)) / 3);
  min-width: calc((100vw - var(--cal-hour-col-width)) / 3);
  scroll-snap-align: start;
  scroll-snap-stop: normal;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--grid-line-color);
  position: relative;
}

@media (min-width: 768px) {
  .day-col {
    flex: 1 1 0;
    min-width: 0;
  }
}

/* Day Header (Sticky Top) */
.day-header {
  position: sticky;
  top: 0;
  height: var(--cal-header-height);
  background-color: var(--bg-app);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: var(--z-sticky-header);
  padding: 4px 2px;
  user-select: none;
  -webkit-user-select: none;
}

.day-header-name {
  font-size: 11px;
  font-weight: var(--font-weight-semibold);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.day-header-number {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
  transition: all var(--transition-fast);
}

/* Today Header Highlight */
.day-col.is-today {
  background-color: var(--grid-current-day-bg);
}

.day-col.is-today .day-header-name {
  color: var(--color-accent);
}

.day-col.is-today .day-header-number {
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
  box-shadow: 0 2px 8px rgba(124, 107, 239, 0.4);
}

/* Day Body Grid Lines (18 hours) */
.day-body {
  position: relative;
  height: calc(var(--cal-hour-height) * var(--cal-total-hours));
  width: 100%;
}

.day-hour-grid-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--grid-line-hour);
  pointer-events: none;
}

/* Current Time Indicator Line */
.cal-now-indicator {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  z-index: var(--z-now-line);
  pointer-events: none;
}

.cal-now-indicator::before {
  content: '';
  position: absolute;
  left: -4px;
  top: -4px;
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
  box-shadow: 0 0 6px rgba(124, 107, 239, 0.8);
}

/* ==========================================================================
   CALENDAR EVENT & CLASS CHIPS
   Proportional absolute placement with overlapping collision columns
   ========================================================================== */

.cal-chip {
  position: absolute;
  border-radius: var(--radius-sm);
  padding: 4px 6px;
  font-size: 11px;
  line-height: 1.2;
  cursor: pointer;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  z-index: var(--z-base);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.08);
  user-select: none;
}

.cal-chip:hover {
  z-index: calc(var(--z-base) + 5);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  border-color: rgba(255, 255, 255, 0.2);
}

.cal-chip:active {
  transform: scale(0.97);
}

/* Class Chip Style (Recurring Subject Schedule) */
.cal-chip.chip-class {
  background-color: var(--bg-surface-raised);
  border-left: 3.5px solid var(--chip-accent-color, var(--color-accent));
}

/* Event Chip Styles (General Events) */
.cal-chip.chip-event {
  background-color: var(--chip-bg-color, var(--bg-surface-raised));
  border-left: 3.5px solid var(--chip-accent-color, var(--color-accent));
}

/* Exam Chip Styles (Parcial, Final, Recuperatorio - Highly Differentiated) */
.cal-chip.chip-exam {
  z-index: calc(var(--z-base) + 3);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.cal-chip.chip-parcial {
  background: linear-gradient(135deg, rgba(255, 55, 95, 0.28) 0%, rgba(255, 55, 95, 0.14) 100%) !important;
  border-left: 4.5px solid #ff375f !important;
}

.cal-chip.chip-final {
  background: linear-gradient(135deg, rgba(255, 69, 58, 0.34) 0%, rgba(255, 69, 58, 0.16) 100%) !important;
  border-left: 4.5px solid #ff453a !important;
  border-top: 1px solid rgba(255, 69, 58, 0.4) !important;
}

.cal-chip.chip-recuperatorio {
  background: linear-gradient(135deg, rgba(255, 214, 10, 0.25) 0%, rgba(255, 214, 10, 0.12) 100%) !important;
  border-left: 4.5px solid #ffd60a !important;
}

.cal-chip-title {
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}

.cal-chip.chip-exam .cal-chip-title {
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.01em;
}

.cal-chip-time {
  font-size: 10px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-variant-numeric: tabular-nums;
}

.cal-chip-room {
  font-size: 10px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 1px;
}

.cal-chip-type-tag {
  align-self: flex-start;
  font-size: 9px;
  padding: 1px 4px;
  border-radius: var(--radius-xs);
  margin-bottom: 2px;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
}

/* Compact Chip for small durations (< 45min) */
.cal-chip.chip-compact {
  flex-direction: row;
  align-items: center;
  gap: 4px;
  padding: 2px 4px;
}

.cal-chip.chip-compact .cal-chip-title {
  margin-bottom: 0;
}

/* ==========================================================================
   MONTHLY CALENDAR VIEW
   ========================================================================== */

.month-view-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow-y: auto;
  padding: 12px 16px calc(var(--nav-height) + var(--safe-bottom) + 16px) 16px;
}

.month-weekdays-header {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 6px;
}

.month-weekday-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--text-muted);
  text-transform: uppercase;
}

.month-matrix {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.month-day-cell {
  min-height: 56px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 4px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.month-day-cell:hover {
  background-color: var(--bg-surface-raised);
  border-color: var(--border-medium);
}

.month-day-cell.other-month {
  opacity: 0.35;
}

.month-day-cell.has-exam {
  border-color: rgba(255, 55, 95, 0.4);
  background-color: rgba(255, 55, 95, 0.05);
}

.month-day-cell.has-final {
  border-color: rgba(255, 69, 58, 0.5);
  background-color: rgba(255, 69, 58, 0.08);
}

.month-day-cell.is-selected {
  border-color: var(--color-accent);
  background-color: var(--color-accent-subtle);
}

.month-day-cell.is-today .month-day-number {
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
  border-radius: var(--radius-full);
}

.month-day-number {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.month-day-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  margin-top: 4px;
  flex-wrap: wrap;
  max-width: 100%;
}

.month-dot {
  width: 5px;
  height: 5px;
  border-radius: var(--radius-full);
}

.month-dot.dot-exam {
  width: 6px;
  height: 6px;
  box-shadow: 0 0 5px currentColor;
}

.month-agenda-panel {
  margin-top: 18px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

/* ==========================================================================
   CUATRIMESTRAL / SEMESTER VIEW (TIMELINE OF MILESTONES)
   ========================================================================== */

.term-view-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow-y: auto;
  padding: 12px 16px calc(var(--nav-height) + var(--safe-bottom) + 16px) 16px;
  gap: 20px;
}

.term-month-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.term-month-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-transform: capitalize;
  display: flex;
  align-items: center;
  gap: 8px;
}

.term-month-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: var(--border-subtle);
}

.term-events-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}