/* ── Schedule / Timetable ────────────────────────────────────────────── */

.schedule-page {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem;
}

.schedule-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.week-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.week-label {
  font-size: 1.125rem;
  font-weight: 600;
  min-width: 220px;
  text-align: center;
}

/* ── Timetable grid ──────────────────────────────────────────────────── */

.timetable-grid {
  display: flex;
  flex-direction: column;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  overflow: hidden;
  background: #fff;
}

.timetable-day-headers {
  display: flex;
  border-bottom: 2px solid #e5e7eb;
}

.time-gutter {
  width: 60px;
  flex-shrink: 0;
  background: #f9fafb;
  border-right: 1px solid #e5e7eb;
}

.day-header {
  flex: 1;
  min-width: 0;
  padding: 0.5rem;
  text-align: center;
  border-left: 1px solid #e5e7eb;
  background: #f9fafb;
}

/* ── Responsive day visibility (admin timetable) ─────────────────────── */

@media (max-width: 1023px) {
  .day-header[data-display-index="-1"],
  .day-header[data-display-index="-2"],
  .day-header[data-display-index="-3"],
  .day-header[data-display-index="-4"],
  .day-header[data-display-index="-5"],
  .day-header[data-display-index="-6"],
  .day-header[data-display-index="5"],
  .day-header[data-display-index="6"],
  .day-column[data-display-index="-1"],
  .day-column[data-display-index="-2"],
  .day-column[data-display-index="-3"],
  .day-column[data-display-index="-4"],
  .day-column[data-display-index="-5"],
  .day-column[data-display-index="-6"],
  .day-column[data-display-index="5"],
  .day-column[data-display-index="6"] {
    display: none;
  }
}

@media (max-width: 639px) {
  .day-header[data-display-index="3"],
  .day-header[data-display-index="4"],
  .day-column[data-display-index="3"],
  .day-column[data-display-index="4"] {
    display: none;
  }
}

@media (max-width: 399px) {
  .day-header[data-display-index="2"],
  .day-column[data-display-index="2"] {
    display: none;
  }
}

.day-header.today {
  background: #eff6ff;
  color: #1d4ed8;
}

.day-name { font-size: 0.75rem; font-weight: 500; text-transform: uppercase; color: #6b7280; }
.day-date { font-size: 1.25rem; font-weight: 700; }

.timetable-body {
  display: flex;
  position: relative;
  min-height: 1020px; /* 17 hours × 60px */
}

.time-gutter-column {
  width: 60px;
  flex-shrink: 0;
  position: relative;
  background: #f9fafb;
  border-right: 1px solid #e5e7eb;
}

.time-label {
  position: absolute;
  right: 6px;
  font-size: 0.65rem;
  color: #9ca3af;
  transform: translateY(-50%);
}

.day-column {
  flex: 1;
  min-width: 0;
  position: relative;
  border-left: 1px solid #e5e7eb;
  cursor: pointer;
}

.day-column:hover { background: #f8fafc; }

.hour-slot {
  height: 60px;
  border-bottom: 1px solid #f3f4f6;
}

.hour-slot:nth-child(2n) { background: #fafafa; }

/* ── Session blocks ──────────────────────────────────────────────────── */

.session-block {
  position: absolute;
  left: 2px;
  right: 20%;
  min-width: 60px;
  border-radius: 4px;
  padding: 4px 6px;
  color: #fff;
  font-size: 0.75rem;
  overflow: hidden;
  cursor: grab;
  user-select: none;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
  z-index: 10;
}

.session-block:active { cursor: grabbing; }

.session-block.cancelled {
  opacity: 0.5;
  text-decoration: line-through;
}

.session-block__name { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.session-block__time { font-size: 0.65rem; opacity: 0.85; }
.session-block__instructor { font-size: 0.65rem; opacity: 0.8; }
.session-block__cancelled { font-size: 0.65rem; background: rgba(0,0,0,0.3); border-radius: 2px; padding: 0 2px; margin-top: 2px; display: inline-block; }

.session-block__drag-handle {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 12px;
  cursor: grab;
}

.session-block__resize-handle {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 8px;
  cursor: ns-resize;
  background: rgba(255,255,255,0.2);
  border-radius: 0 0 4px 4px;
}

.session-block__actions {
  display: none;
  gap: 4px;
  margin-top: 4px;
}

.session-block:hover .session-block__actions { display: flex; }

/* ── Modal ───────────────────────────────────────────────────────────── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-overlay.hidden { display: none; }

.modal-content {
  background: #fff;
  border-radius: 0.5rem;
  padding: 1.5rem;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: #6b7280;
}

.modal-footer {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid #e5e7eb;
}

.modal-edit-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid #fee2e2;
}

.modal-edit-actions.hidden { display: none; }

/* ── Utility button styles ───────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.75rem;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary { background: var(--btn-primary-bg, #4f46e5); color: var(--btn-primary-fg, #fff); }
.btn-primary:hover { background: var(--btn-primary-bg, #4f46e5); filter: brightness(0.9); }
.btn-secondary { background: #fff; color: #374151; border-color: #d1d5db; }
.btn-secondary:hover { background: #f9fafb; }
.btn-danger { background: #dc2626; color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-xs { padding: 0.125rem 0.375rem; font-size: 0.7rem; }

.form-group { margin-bottom: 0.75rem; }
.form-group label { display: block; font-size: 0.875rem; font-weight: 500; margin-bottom: 0.25rem; color: #374151; }
.form-control { width: 100%; padding: 0.375rem 0.5rem; border: 1px solid #d1d5db; border-radius: 0.375rem; font-size: 0.875rem; }
.form-control:focus { outline: none; border-color: #4f46e5; box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }

.alert { padding: 0.75rem; border-radius: 0.375rem; margin-bottom: 0.75rem; font-size: 0.875rem; }
.alert-danger { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

/* ── Creation ghost (two-click new session preview) ──────────────────── */

.creation-ghost {
  position: absolute;
  left: 2px;
  right: 20%;
  background: rgba(79, 70, 229, 0.25);
  border: 2px dashed #4f46e5;
  border-radius: 4px;
  padding: 4px 6px;
  font-size: 0.7rem;
  color: #3730a3;
  font-weight: 600;
  pointer-events: none;
  z-index: 20;
  user-select: none;
}

/* ── Confirmation Modal ──────────────────────────────────────────────── */

.confirm-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.confirm-modal-overlay.hidden { display: none; }

.confirm-modal-dialog {
  background: #fff;
  border-radius: 0.5rem;
  padding: 1.5rem;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.confirm-modal-body {
  margin-bottom: 1.25rem;
}

.confirm-modal-message {
  font-size: 1rem;
  color: #111827;
  line-height: 1.5;
}

.confirm-modal-footer {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

.confirm-modal-proceed {
  background-color: #dc2626 !important;
  color: #fff !important;
  border-color: #dc2626 !important;
}

.confirm-modal-proceed:hover {
  background-color: #b91c1c !important;
  border-color: #b91c1c !important;
}

/* ── Category filter bar ─────────────────────────────────────────────── */

.category-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.5rem 0;
}

.category-filter__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  border: 2px solid var(--cat-color, #6B7280);
  background: transparent;
  color: #374151;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s;
}

.category-filter__btn[data-active="true"] {
  background-color: var(--cat-color, #6B7280);
  color: #fff;
}

.category-filter__btn[data-active="false"] {
  opacity: 0.5;
}

.category-filter__dot {
  display: inline-block;
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background-color: var(--cat-color, #6B7280);
  flex-shrink: 0;
}