/* =============================================================================
   LAYOUT - Fun Rounded Design
   ============================================================================= */

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* =============================================================================
   APP CONTAINER
   ============================================================================= */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* =============================================================================
   HEADER - Fun gradient with rounded elements
   ============================================================================= */
.app-header {
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-light);
  padding: var(--space-sm) var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.app-title {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 800;
  background: var(--title-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-right: auto;
  letter-spacing: -0.02em;
}

/* Tabs - pill style in a container */
.header-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-tertiary);
  padding: 3px;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.tab-btn {
  min-height: 28px;
  padding: 4px 10px;
  border-radius: calc(var(--radius-md) - 2px);
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--text-muted);
  border: none;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--accent-primary);
  color: var(--text-on-accent);
  box-shadow: var(--shadow-sm);
}

/* Controls container */
.header-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

/* Font size control group */
.control-group {
  display: flex;
  align-items: center;
  gap: 1px;
  background: var(--bg-tertiary);
  padding: 3px;
  border-radius: var(--radius-md);
}

.control-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--text-muted);
  margin: 0 var(--space-xs);
}

.control-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 24px;
  min-width: 24px;
  padding: 2px;
  background: transparent;
  border: none;
  border-radius: calc(var(--radius-md) - 2px);
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.control-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.control-btn.active {
  background: var(--accent-primary);
  color: var(--text-on-accent);
}

/* Theme toggle - icon only */
#themeToggle {
  background: var(--bg-tertiary);
  padding: 4px 8px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
}

#themeToggle:hover {
  background: var(--bg-hover);
}

/* Font size buttons - small and large A */
.font-btn {
  min-width: 22px;
  font-family: var(--font-display);
}

.font-btn.size-small {
  font-size: 0.7rem;
}

.font-btn.size-large {
  font-size: 1rem;
}

.font-btn.size-small { font-size: 0.65rem; }
.font-btn.size-medium { font-size: 0.75rem; }
.font-btn.size-large { font-size: 0.85rem; }
.font-btn.size-xlarge { font-size: 0.95rem; }

/* =============================================================================
   MAIN CONTENT
   ============================================================================= */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.tab-content {
  display: none;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.tab-content.active {
  display: flex;
  flex-direction: column;
}

/* =============================================================================
   HEADER CLASS SELECTOR - Inline in header
   ============================================================================= */
.header-class-selector {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex: 1;
  min-width: 0;
}

.header-class-selector .selector-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.header-class-selector .selector-actions .filter-action-btn {
  padding: 4px 10px;
  font-size: var(--font-size-xs);
}

.header-class-selector .class-groups {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  flex: 1;
  min-width: 0;
}

/* Individual class group card - compact for header */
.class-group {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 2px solid transparent;
  transition: all var(--transition-fast);
}

.class-group.has-events {
  border-color: var(--border-light);
}

.class-group.no-events {
  opacity: 0.4;
}

/* Class number label */
.class-group-label {
  font-size: var(--font-size-xs);
  font-weight: 800;
  color: var(--text-primary);
  padding-right: 6px;
  border-right: 2px solid var(--border-light);
}

.class-group.no-events .class-group-label {
  text-decoration: line-through;
}

/* Section toggles within group */
.class-group-sections {
  display: flex;
  gap: 2px;
}

.section-toggle {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px 6px;
  border-radius: 6px;
  font-size: var(--font-size-xs);
  font-weight: 700;
  border: 2px solid transparent;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.section-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.section-toggle.active {
  background: var(--bg-secondary);
  border-color: currentColor;
}

.section-toggle .section-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.section-toggle:not(.active) .section-dot {
  opacity: 0.4;
}

.section-toggle.no-events {
  opacity: 0.4;
  text-decoration: line-through;
}

/* Color-coded group backgrounds */
.class-group[data-class="1170"] {
  background: var(--cal-1170-primary-bg);
}
.class-group[data-class="1170"] .class-group-label {
  color: var(--cal-1170-primary-text);
  border-color: var(--cal-1170-primary-border);
}
.class-group[data-class="1170"].has-events {
  border-color: var(--cal-1170-primary-border);
}
.class-group[data-class="1170"] .section-toggle.active {
  color: var(--cal-1170-primary-text);
}

.class-group[data-class="1181"] {
  background: var(--cal-1181-primary-bg);
}
.class-group[data-class="1181"] .class-group-label {
  color: var(--cal-1181-primary-text);
  border-color: var(--cal-1181-primary-border);
}
.class-group[data-class="1181"].has-events {
  border-color: var(--cal-1181-primary-border);
}
.class-group[data-class="1181"] .section-toggle.active {
  color: var(--cal-1181-primary-text);
}

.class-group[data-class="1190"] {
  background: var(--cal-1190-primary-bg);
}
.class-group[data-class="1190"] .class-group-label {
  color: var(--cal-1190-primary-text);
  border-color: var(--cal-1190-primary-border);
}
.class-group[data-class="1190"].has-events {
  border-color: var(--cal-1190-primary-border);
}
.class-group[data-class="1190"] .section-toggle.active {
  color: var(--cal-1190-primary-text);
}

.class-group[data-class="2740"] {
  background: var(--cal-2740-primary-bg);
}
.class-group[data-class="2740"] .class-group-label {
  color: var(--cal-2740-primary-text);
  border-color: var(--cal-2740-primary-border);
}
.class-group[data-class="2740"].has-events {
  border-color: var(--cal-2740-primary-border);
}
.class-group[data-class="2740"] .section-toggle.active {
  color: var(--cal-2740-primary-text);
}

/* Compact groups in sidebar - vertical layout */
.compact-groups {
  flex-direction: column;
  gap: 6px;
}

.compact-groups .class-group {
  width: 100%;
}

/* =============================================================================
   CALENDAR FILTERS - Legacy support (keeping for now)
   ============================================================================= */
.calendar-filters {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
}

.filter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.filter-label {
  font-size: var(--font-size-sm);
  font-weight: 800;
  color: var(--text-primary);
}

.filter-actions {
  display: flex;
  gap: 6px;
}

.filter-action-btn {
  padding: 6px 14px;
  font-size: var(--font-size-sm);
  font-weight: 700;
  border: 2px solid var(--accent-primary);
  border-radius: var(--radius-md);
  color: var(--accent-primary);
  background: transparent;
  transition: all var(--transition-fast);
}

.filter-action-btn:hover {
  background: var(--accent-primary);
  color: var(--text-on-accent);
  transform: translateY(-1px);
}

.filter-action-btn:active {
  transform: translateY(0);
}

.calendar-toggles {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

/* Calendar toggle pills */
.cal-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 30px;
  padding: 4px 12px;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border: 2px solid var(--border-light);
  background: var(--bg-tertiary);
  color: var(--text-muted);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.cal-toggle:hover {
  background: var(--bg-hover);
  border-color: var(--border-medium);
  transform: translateY(-1px);
}

.cal-toggle.active {
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.cal-toggle.no-events {
  opacity: 0.4;
  text-decoration: line-through;
}

.cal-toggle .color-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.cal-toggle:not(.active) .color-dot {
  opacity: 0.5;
}

/* =============================================================================
   LOADING & ERROR STATES
   ============================================================================= */
.loading-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  color: var(--text-muted);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.loading-indicator::before {
  content: '';
  width: 1.5rem;
  height: 1.5rem;
  border: 3px solid var(--bg-tertiary);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  margin-right: var(--space-md);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.error-message {
  padding: var(--space-md);
  margin: var(--space-md);
  background: var(--cal-2740-primary-bg);
  border-left: 4px solid var(--cal-2740-primary-border);
  color: var(--cal-2740-primary-text);
  border-radius: var(--radius-md);
}

/* =============================================================================
   INSTRUCTIONS TAB
   ============================================================================= */
.instructions-content {
  padding: var(--space-lg);
  max-width: 900px;
  margin: 0 auto;
  overflow-y: auto;
  flex: 1;
}

.instructions-content h2 {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 800;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.instructions-content h3 {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.instructions-content p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

.instructions-content ol,
.instructions-content ul {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
  color: var(--text-secondary);
}

.instructions-content li {
  margin-bottom: var(--space-sm);
}

.instructions-content code {
  background: var(--bg-tertiary);
  padding: 0.15em 0.5em;
  border-radius: var(--radius-sm);
  font-family: "SF Mono", Monaco, Consolas, monospace;
  font-size: 0.9em;
}

.instructions-content pre {
  background: var(--bg-tertiary);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
  border: 1px solid var(--border-light);
}

.instructions-content pre code {
  background: none;
  padding: 0;
}

.instructions-content a {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
}

.instructions-content a:hover {
  text-decoration: underline;
}

/* =============================================================================
   EVENT MODAL / POPUP
   ============================================================================= */
.event-modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  padding: var(--space-md);
}

.event-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.event-modal {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  max-width: 480px;
  width: 100%;
  max-height: 80vh;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.event-modal-overlay.active .event-modal {
  transform: scale(1) translateY(0);
}

.event-modal-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
}

.event-modal-color {
  width: 6px;
  border-radius: 3px;
  align-self: stretch;
  flex-shrink: 0;
}

.event-modal-title-section {
  flex: 1;
  min-width: 0;
}

.event-modal-title {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
  word-break: break-word;
}

.event-modal-calendar {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-muted);
}

.event-modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xl);
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.event-modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.event-modal-body {
  padding: var(--space-lg);
  overflow-y: auto;
  flex: 1;
}

.event-modal-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.event-modal-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.event-modal-meta-icon {
  width: 20px;
  text-align: center;
  color: var(--text-muted);
}

.event-modal-description {
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-light);
}

.event-modal-description-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.event-modal-description-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.event-modal-description-text a {
  color: var(--accent-primary);
  text-decoration: none;
}

.event-modal-description-text a:hover {
  text-decoration: underline;
}

.event-modal-no-description {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  font-style: italic;
}

/* =============================================================================
   DAY DETAIL MODAL - Shows all events for a day
   ============================================================================= */
.day-modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  padding: var(--space-md);
}

.day-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.day-modal {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  max-width: 520px;
  width: 100%;
  max-height: 85vh;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.day-modal-overlay.active .day-modal {
  transform: scale(1) translateY(0);
}

.day-modal-header {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-tertiary);
}

.day-modal-title-section {
  flex: 1;
  min-width: 0;
}

.day-modal-title {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--text-primary);
}

.day-modal-subtitle {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-muted);
}

.day-modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xl);
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.day-modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.day-modal-body {
  padding: var(--space-md);
  overflow-y: auto;
  flex: 1;
}

.day-modal-events {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.day-modal-event {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  border-left: 4px solid;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.day-modal-event:hover {
  transform: translateX(4px);
  opacity: 0.9;
}

.day-modal-event-title {
  font-weight: 600;
  color: inherit;
  margin-bottom: 2px;
}

.day-modal-event-time {
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

.day-modal-event-calendar {
  font-size: var(--font-size-xs);
  opacity: 0.7;
  margin-top: 2px;
}

.day-modal-no-events {
  text-align: center;
  color: var(--text-muted);
  padding: var(--space-lg);
  font-style: italic;
}