.revision-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.revision-header h1 {
  font-size: 2.4rem;
  font-weight: 700;
  margin: 0;
  background: linear-gradient(135deg, #FFD700 0%, #FFA500 25%, #FFD700 50%, #FFA500 75%, #FFD700 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s ease-in-out infinite;
  filter: drop-shadow(0 0 10px rgba(255, 215, 0, 0.3));
}

@keyframes shimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.revision-header p {
  color: var(--color-text-medium);
  font-size: 1.05rem;
  margin: 0.8rem 0 0 0;
}

.view-toggle {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.view-toggle button {
  background: var(--color-card-background);
  border: 2px solid var(--color-border);
  color: var(--color-text-dark);
  padding: 0.9rem 2rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-speed);
  font-size: 1rem;
}

.view-toggle button:hover {
  border-color: var(--color-primary);
}

.view-toggle button.active {
  background: var(--color-primary);
  color: var(--color-card-background);
  border-color: var(--color-primary);
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.stat-card {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  text-align: center;
  transition: all var(--transition-speed);
}

.stat-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.15);
}

#daysToExamCard.highlighted {
  border: 2px solid var(--color-primary);
  box-shadow: 0 0 0 4px rgba(var(--color-primary-rgb), 0.1), 0 4px 12px rgba(var(--color-primary-rgb), 0.2);
  background: linear-gradient(135deg, var(--color-card-background) 0%, rgba(var(--color-primary-rgb), 0.05) 100%);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
}

.stat-label {
  color: var(--color-text-medium);
  font-size: 0.9rem;
  margin: 0.5rem 0 0 0;
  font-weight: 500;
}

.main-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.calendar-card {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 2rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.calendar-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.calendar-nav button {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  color: var(--color-text-dark);
  padding: 0.7rem 1rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition-speed);
}

.calendar-nav button:hover {
  background: var(--color-primary);
  color: var(--color-card-background);
  border-color: var(--color-primary);
}

.calendar-nav h3 {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 600;
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.weekday {
  text-align: center;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-medium);
  padding: 0.6rem 0;
}

.calendar-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.8rem;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  background: var(--color-background);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.3rem;
  position: relative;
  transition: all var(--transition-speed);
}

.calendar-day:hover {
  border-color: var(--color-primary);
  background: rgba(var(--color-primary-rgb), 0.1);
}

.calendar-day.other-month {
  color: var(--color-text-medium);
  opacity: 0.5;
}

.calendar-day.past-date {
  opacity: 0.5;
  color: var(--color-text-medium);
  cursor: not-allowed;
  background: var(--color-card-background);
}

.calendar-day.past-date:hover {
  border-color: var(--color-border);
  background: var(--color-card-background);
}

.calendar-day.has-revision {
  border: 2px solid var(--color-primary);
  background: rgba(var(--color-primary-rgb), 0.1);
}

.calendar-day.exam-day {
  border: 2px solid #ff6b6b;
  background: rgba(255, 107, 107, 0.1);
}

.revision-dot {
  width: 4px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 50%;
  position: absolute;
  bottom: 2px;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.quick-add {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.quick-add h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 0;
  user-select: none;
  color: var(--color-primary);
  transition: color var(--transition-speed);
}

.quick-add h3:hover {
  color: var(--color-accent);
}

.revision-list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  padding: 1rem 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 0;
  user-select: none;
  transition: all var(--transition-speed);
}

.revision-list-header:hover {
  color: var(--color-primary);
}

.revision-list-header h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.revision-list-header::after {
  content: "▼";
  font-size: 0.75rem;
  transition: transform var(--transition-speed);
  order: 2;
}

.revision-list-header.collapsed::after {
  transform: rotate(-90deg);
}

.revision-list-content {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-height: 800px;
  overflow: hidden;
  transition: all var(--transition-speed) ease;
  opacity: 1;
}

.revision-list-content.collapsed {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
}

.quick-add h3:hover {
  color: var(--color-accent);
}

.quick-add-toggle::after {
  content: "▼";
  font-size: 0.75rem;
  transition: transform var(--transition-speed);
}

.quick-add-toggle.collapsed::after {
  transform: rotate(-90deg);
}

.quick-add-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-height: 500px;
  overflow: hidden;
  transition: all var(--transition-speed) ease;
  opacity: 1;
}

.quick-add-form.collapsed {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
}

.test-summary-toggle {
  cursor: pointer;
  padding: 0;
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-dark);
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  transition: all var(--transition-speed);
}

.test-summary-toggle:hover {
  color: var(--color-primary);
}

.test-summary-content {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-height: 500px;
  overflow: hidden;
  transition: all var(--transition-speed) ease;
  opacity: 1;
}

.test-summary-content.collapsed {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
}

.test-item {
  transition: all var(--transition-speed);
}

.test-item:hover {
  transform: translateX(4px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-medium);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.quick-add input,
.quick-add textarea,
.quick-add select {
  width: 100%;
  padding: 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background: var(--color-background);
  color: var(--color-text-dark);
  font-family: inherit;
  font-size: 0.9rem;
  box-sizing: border-box;
}

.quick-add textarea {
  resize: vertical;
  min-height: 60px;
}

.quick-add button {
  width: 100%;
  background: var(--color-primary);
  color: var(--color-card-background);
  border: none;
  padding: 0.9rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-speed);
  font-size: 0.95rem;
}

.quick-add button:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.3);
}

.revision-list {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  max-height: 700px;
  overflow-y: auto;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.revision-list h3 {
  margin: 0 0 1.2rem 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.filter-tabs {
  display: flex;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}

.filter-tabs button {
  background: var(--color-background);
  border: 1px solid var(--color-border);
  color: var(--color-text-medium);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-speed);
}

.filter-tabs button:hover {
  border-color: var(--color-primary);
}

.filter-tabs button.active {
  background: var(--color-primary);
  color: var(--color-card-background);
  border-color: var(--color-primary);
}

.revision-item {
  background: var(--color-background);
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 0.8rem;
  font-size: 0.9rem;
  border-left: 4px solid var(--color-primary);
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  transition: all var(--transition-speed);
  cursor: pointer;
}

.revision-item:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
}

.revision-item.completed {
  opacity: 0.65;
  background: var(--color-background);
}

.revision-item.completed .revision-item-topic {
  text-decoration: line-through;
}

.revision-item.priority-high {
  border-left-width: 5px;
  border-left-color: #ff6b6b;
}

.revision-item.priority-medium {
  border-left-width: 4px;
  border-left-color: #ffc107;
}

.revision-item.priority-low {
  border-left-width: 3px;
  border-left-color: #28a745;
}

.revision-item-checkbox {
  margin-top: 0.2rem;
  cursor: pointer;
  width: 18px;
  height: 18px;
  min-width: 18px;
}

.revision-item-content {
  flex: 1;
}

.revision-item-date {
  color: var(--color-text-dark);
  font-size: 0.8rem;
  font-weight: 700;
}

.revision-item-topic {
  color: var(--color-text-dark);
  margin: 0.2rem 0;
  font-weight: 700;
  font-size: 0.95rem;
}

.revision-item-delete {
  background: transparent;
  color: var(--color-text-medium);
  border: none;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1.2rem;
  white-space: nowrap;
  transition: all var(--transition-speed);
  opacity: 0;
  line-height: 1;
}

.revision-item:hover .revision-item-delete {
  opacity: 1;
  color: #ff6b6b;
}

.revision-item-delete:hover {
  background: rgba(255, 107, 107, 0.1);
}

.exams-upcoming {
  background: var(--color-card-background);
  border: 1px solid rgba(255, 107, 107, 0.3);
  border-radius: var(--border-radius);
  padding: 1rem;
}

.exams-upcoming h3 {
  margin: 0 0 0.8rem 0;
  font-size: 1rem;
  color: #ff6b6b;
}

.exam-item {
  background: var(--color-background);
  padding: 0.6rem;
  border-left: 3px solid #ff6b6b;
  margin-bottom: 0.6rem;
  font-size: 0.85rem;
}

.exam-item-board {
  font-weight: 600;
  color: #ff6b6b;
}

.exam-item-date {
  color: var(--color-text-medium);
  font-size: 0.8rem;
}

.week-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.day-column {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.2rem;
  min-height: 350px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.day-column-header {
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 1rem;
  padding: 0.8rem 0.5rem;
  border-bottom: 2px solid var(--color-border);
  font-size: 0.95rem;
  border-radius: var(--border-radius);
  transition: all var(--transition-speed);
}

.day-column-date {
  font-size: 0.85rem;
  color: var(--color-text-medium);
  font-weight: 500;
}

.day-session {
  background: var(--color-background);
  padding: 0.7rem;
  border-radius: var(--border-radius);
  margin-bottom: 0.7rem;
  font-size: 0.85rem;
  border-left: 3px solid var(--color-primary);
  transition: all var(--transition-speed);
}

.day-session:hover {
  box-shadow: 0 2px 6px rgba(var(--color-primary-rgb), 0.12);
}

.day-session.priority-high {
  border-left-color: #ff6b6b;
}

.day-session.priority-medium {
  border-left-color: #ffc107;
}

.day-session.completed {
  opacity: 0.55;
}

@media (max-width: 768px) {
  .main-grid {
    grid-template-columns: 1fr;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .calendar-day {
    font-size: 0.8rem;
  }

  .revision-list {
    max-height: 300px;
  }

  .week-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.day-detail-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.day-detail-modal.active {
  display: flex;
}

.day-detail-content {
  background: var(--color-card-background);
  border-radius: var(--border-radius);
  padding: 2rem;
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.day-detail-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--color-border);
}

.day-detail-date {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-text-dark);
  margin: 0 0 0.5rem 0;
}

.day-detail-dayname {
  color: var(--color-text-medium);
  font-size: 0.95rem;
  font-weight: 700;
}

.day-detail-sessions {
  margin-bottom: 1.5rem;
}

.day-detail-sessions-label {
  font-weight: 800;
  color: var(--color-text-dark);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.day-session-item {
  background: var(--color-background);
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 0.8rem;
  border-left: 4px solid var(--color-primary);
}

.day-session-topic {
  font-weight: 800;
  color: var(--color-text-dark);
  margin-bottom: 0.3rem;
  font-size: 0.95rem;
}

.day-session-priority {
  font-size: 0.85rem;
  color: var(--color-text-dark);
  font-weight: 700;
}

.session-delete-btn {
  background: #ff6b6b;
  color: var(--color-card-background);
  border: none;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 0.5rem;
  transition: all var(--transition-speed);
}

.session-delete-btn:hover {
  background: #ff5252;
  transform: translateY(-1px);
}

.day-detail-test {
  background: rgba(255, 107, 107, 0.1);
  border: 2px solid #ff6b6b;
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1.5rem;
}

.day-detail-test-label {
  font-weight: 600;
  color: #ff6b6b;
  margin-bottom: 0.5rem;
}

.day-detail-actions {
  display: flex;
  gap: 1rem;
}

.day-detail-btn {
  flex: 1;
  padding: 0.8rem;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-speed);
}

.day-detail-btn-close {
  background: var(--color-border);
  color: var(--color-text-dark);
}

.day-detail-btn-close:hover {
  background: var(--color-border);
  opacity: 0.8;
}

.day-detail-btn-add {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--color-card-background);
}

.day-detail-btn-add:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.3);
}

.day-detail-btn-add:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}