/* =============================================
   TRASH_MATH — Компоненты
   ============================================= */

/* ===== КНОПКИ ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 16px 36px;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--primary-color);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--primary-dark);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background: var(--accent-color);
  color: var(--text-primary);
  box-shadow: var(--shadow-accent);
}
.btn-accent:hover {
  background: var(--accent-dark);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  border-color: var(--primary-color);
  color: var(--primary-dark);
}
.btn-outline:hover {
  background: var(--primary-color);
  color: var(--text-primary);
}

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

.btn-sm { padding: 10px 24px; font-size: var(--font-size-xs); }
.btn-lg { padding: 20px 48px; font-size: var(--font-size-base); }

.btn-icon {
  padding: 10px;
  border-radius: var(--radius-circle);
  width: 40px;
  height: 40px;
}

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

/* ===== КАРТОЧКИ ===== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  position: relative;
  overflow: hidden;
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.card-decorative::before {
  content: '';
  position: absolute;
  width: 120px;
  height: 120px;
  border-radius: var(--radius-circle);
  background: var(--accent-color);
  opacity: 0.15;
  top: -30px;
  right: -30px;
  pointer-events: none;
}

.card-flat {
  box-shadow: none;
  border: 1px solid var(--border-color);
}
.card-flat:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

/* ===== БЕЙДЖИ ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 14px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-pill);
  line-height: 1.4;
  white-space: nowrap;
  
  /* Glassmorphism */
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}
.badge-primary { background: #C4DCF099; color: var(--primary-deeper); }
.badge-accent { background: #F0DCC899; color: var(--accent-dark); }
.badge-success { background: #E5F5EE99; color: #2D7A54; }
.badge-warning { background: #FFF8E599; color: #8A6C1E; }
.badge-error { background: #FDE8E899; color: #A03030; }
.badge-info { background: #E8F0FA99; color: #2A5F8F; }
.badge-lg { padding: 6px 18px; font-size: var(--font-size-sm); }

/* ===== ФОРМЫ ===== */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: var(--bg-input);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  outline: none;
}
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--primary-color);
  background: var(--bg-card);
  box-shadow: 0 0 0 4px rgba(168, 200, 232, 0.2);
}
.form-input::placeholder { color: var(--text-muted); }
.form-textarea { resize: vertical; min-height: 120px; }
.form-input.error { border-color: var(--error); }
.form-error { color: var(--error); font-size: var(--font-size-xs); margin-top: var(--space-xs); }

/* ===== МОДАЛЬНОЕ ОКНО ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
}
.modal-overlay.active { opacity: 1; visibility: visible; }

.modal-content {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  max-width: 560px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.95);
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  box-shadow: var(--shadow-xl);
}
.modal-overlay.active .modal-content {
  transform: translateY(0) scale(1);
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}
.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
  border-radius: var(--radius-circle);
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
}
.modal-close:hover { color: var(--text-primary); background: var(--bg-secondary); }

/* ===== TOAST УВЕДОМЛЕНИЯ ===== */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  box-shadow: var(--shadow-lg);
  border-left: 4px solid var(--primary-color);
  max-width: 400px;
  animation: slideRight var(--transition-base) ease;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.toast-success { border-left-color: var(--success); }
.toast-error { border-left-color: var(--error); }
.toast-warning { border-left-color: var(--warning); }

/* ===== TABS ===== */
.tabs {
  display: flex;
  gap: var(--space-xs);
  border-bottom: 2px solid var(--border-light);
  margin-bottom: var(--space-lg);
  overflow-x: auto;
}

.tab {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  border: none;
  background: none;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  white-space: nowrap;
  margin-bottom: -2px;
}
.tab:hover { color: var(--text-primary); }
.tab.active {
  color: var(--primary-dark);
  border-bottom-color: var(--primary-color);
  font-weight: var(--font-weight-semibold);
}

/* ===== ACCORDION ===== */
.accordion {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.accordion-header {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-elevated);
  border: none;
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-dark);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
}
.accordion-header:hover { background: var(--primary-light); }
.accordion-header .arrow {
  transition: transform var(--transition-base);
  font-size: 12px;
}
.accordion-header.active .arrow { transform: rotate(180deg); }
.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
  will-change: max-height;
}
.accordion-body.open { max-height: 15000px; }
.accordion-body.fully-open { max-height: none; overflow: visible; }
.accordion-body-inner {
  padding: var(--space-lg);
  border-top: 1px solid var(--border-light);
}

/* ===== SKELETON LOADING ===== */
.skeleton {
  position: relative;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.skeleton::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transform: translateX(-100%);
  animation: shimmer 1.5s infinite;
}
.skeleton-text { height: 16px; margin-bottom: var(--space-sm); }
.skeleton-title { height: 24px; width: 60%; margin-bottom: var(--space-md); }
.skeleton-avatar { width: 48px; height: 48px; border-radius: var(--radius-circle); }
.skeleton-card { height: 200px; border-radius: var(--radius-lg); }

/* ===== AVATAR ===== */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-circle);
  object-fit: cover;
  background: var(--primary-light);
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  color: var(--primary-deeper);
  font-size: var(--font-size-sm);
}
.avatar-sm { width: 32px; height: 32px; font-size: var(--font-size-xs); }
.avatar-lg { width: 56px; height: 56px; font-size: var(--font-size-lg); }
.avatar-xl { width: 80px; height: 80px; font-size: var(--font-size-2xl); }

/* ===== PROGRESS BAR ===== */
.progress-bar {
  height: 8px;
  background: var(--bg-secondary);
  border-radius: var(--radius-pill);
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
  border-radius: var(--radius-pill);
  transition: width var(--transition-slow);
}

/* ===== STAT CARD ===== */
.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}
.stat-card-value {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--primary-dark);
  line-height: 1;
  margin-bottom: var(--space-xs);
}
.stat-card-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
}

/* ===== FILE UPLOAD ===== */
.file-upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  cursor: pointer;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  background: var(--bg-input);
}
.file-upload-zone:hover,
.file-upload-zone.dragover {
  border-color: var(--primary-color);
  background: var(--primary-light);
}
.file-upload-zone .icon {
  font-size: 48px;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  color: var(--text-muted);
}
.empty-state-icon {
  font-size: 64px;
  margin-bottom: var(--space-md);
  opacity: 0.3;
}
.empty-state-text {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-lg);
}

/* ===== CHIP / TAG ===== */
.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-pill);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  cursor: pointer;
  border: 1px solid transparent;
}
.chip:hover { background: var(--primary-light); color: var(--primary-deeper); }
.chip.active {
  background: var(--primary-color);
  color: var(--text-primary);
  border-color: var(--primary-dark);
}
.chip-remove {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  color: inherit;
  opacity: 0.6;
  padding: 0;
}
.chip-remove:hover { opacity: 1; }

/* ===== TOOLTIP ===== */
.tooltip {
  position: relative;
}
.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: var(--text-inverse);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  pointer-events: none;
}
.tooltip:hover::after { opacity: 1; visibility: visible; }

/* ===== LOADING SPINNER ===== */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-light);
  border-top-color: var(--primary-color);
  border-radius: var(--radius-circle);
  animation: spin 0.8s linear infinite;
}
.spinner-sm { width: 20px; height: 20px; border-width: 2px; }
.spinner-lg { width: 60px; height: 60px; border-width: 4px; }

/* ===== DIVIDER ===== */
.divider {
  height: 1px;
  background: var(--border-light);
  margin: var(--space-lg) 0;
}

/* ===== DROPDOWN ===== */
.dropdown {
  position: relative;
  display: inline-block;
}
.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  min-width: 200px;
  padding: var(--space-sm);
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
}
.dropdown.active .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown-item {
  display: block;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  text-align: left;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
}
.dropdown-item:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* ===== SVG RENDER ===== */
.render-svg {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  margin: 15px 0;
  overflow: visible;
}
.render-svg svg {
  max-width: 100%;
  width: 100%;
  height: auto;
  stroke: currentColor;
}
.render-svg svg path,
.render-svg svg line,
.render-svg svg polyline,
.render-svg svg polygon,
.render-svg svg rect,
.render-svg svg circle,
.render-svg svg ellipse {
  stroke: currentColor;
}

/* Size variants for specific task types */
.render-svg.render-svg-wide svg   { max-width: 100%; }   /* Task 18 parameters, complex graphs */
.render-svg.render-svg-medium svg { max-width: 350px; }  /* Task 2, 3 */
.render-svg.render-svg-large svg  { max-width: 500px; }  /* Task 11 */
.render-svg.render-svg-8 svg     { max-width: 500px; }  /* Task 8 - wide horizontal graphs */
.render-svg.render-svg-8.render-svg-tall svg { max-width: 400px; } /* Task 8 - tall/square tangent graphs */

/* Interval method diagrams inside solution accordions */
.accordion-body .render-svg svg { max-width: 350px; }
/* Wide diagrams (parameter problems, complex graphs) — override the 350px limit */
.accordion-body .render-svg.render-svg-wide svg { max-width: 100%; }

@media print {
  .render-svg svg {
    shape-rendering: geometricPrecision;
    max-width: 100% !important;
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  body > * { display: none !important; }
  #print-container { display: block !important; }
  body { background: white !important; margin: 0; padding: 0; }
  
  #print-container {
    color: black;
    font-size: 11pt;
  }
  .print-header { margin-bottom: 20px; border-bottom: 2px solid black; padding-bottom: 10px; }
  .print-header-top { display: flex; justify-content: space-between; align-items: flex-end; }
  .print-logo { font-size: 18pt; }
  .print-subtitle { color: #555; font-size: 10pt; margin-top: 5px; }
  .print-title { font-size: 14pt; font-weight: bold; text-align: center; margin-top: 15px; }
  .print-section-title { background: #333; color: white !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; padding: 6px; text-align: center; font-weight: bold; margin: 20px 0 15px; }
  
  .print-task { margin-bottom: 20px; padding-bottom: 15px; border-bottom: 1px dashed #ccc; page-break-inside: avoid; }
  .print-task-part2 { border-bottom: none; }
  .print-task-header { margin-bottom: 10px; }
  .print-task-header-part2 { margin-bottom: 10px; border-top: 1px solid #333; padding-top: 5px; display: flex; justify-content: space-between; }
  .print-task-badge { border: 1px solid #333; border-radius: 10px; padding: 2px 8px; font-weight: bold; margin-right: 10px; }
  .print-task-topic { color: #666; font-size: 9pt; }
  .print-task-content { margin-bottom: 10px; }
  
  .print-task-draft { border: 1px dashed #999; height: 100px; padding: 5px; margin: 15px 0; }
  .print-task-draft-title { color: #999; font-size: 8pt; }
  .print-task-answer { background: #f0f0f0 !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; padding: 8px; border: 1px solid #333; border-radius: 4px; margin-top: 10px; }
  .print-answer-line { display: inline-block; width: 80%; border-bottom: 1px solid #333; height: 14px; }
  .print-task-answer-part2 { border: 1px solid #333; padding: 8px; border-radius: 4px; margin-top: auto; }
  
  .print-task-solution-header { font-weight: bold; margin: 10px 0; border-bottom: 1px solid #333; }
  .print-task-grid {
    height: 350px;
    background-size: 20px 20px;
    background-image: linear-gradient(to right, #e0e0e0 1px, transparent 1px), linear-gradient(to bottom, #e0e0e0 1px, transparent 1px);
    border: 1px solid #ccc;
    margin-bottom: 15px;
    -webkit-print-color-adjust: exact; print-color-adjust: exact;
  }
}

/* ===== COOKIE BANNER ===== */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-light);
  padding: var(--space-md) var(--space-lg);
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  z-index: 1000;
  transform: translateY(100%);
  transition: transform var(--transition-slow);
}
@media (min-width: 768px) {
  .cookie-banner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}
.cookie-banner.visible {
  transform: translateY(0);
}
.cookie-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* ==================== PAYWALL & MEDIA LOCK ==================== */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
}
.media-card-thumb {
  position: relative;
}
.media-card-play {
  font-size: 3rem;
  opacity: 0.7;
  transition: opacity 0.2s, transform 0.2s;
}
.media-card-item:hover .media-card-play {
  opacity: 1;
  transform: scale(1.15);
}
.media-lock-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  pointer-events: none;
}
.media-lock-icon {
  font-size: 2.5rem;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.5));
}
.media-card-locked {
  opacity: 0.9;
}
.media-card-locked:hover {
  opacity: 1;
}
@keyframes paywall-appear {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

/* ==================== SUBSCRIPTION BADGE ==================== */
.subscription-toggle-btn {
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  border-radius: 8px !important;
}

/* ==================== CRM STUDENT PROFILE ==================== */
.student-profile-header {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: linear-gradient(135deg, var(--primary-light), var(--accent-light));
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}
.profile-avatar-xl {
  width: 72px;
  height: 72px;
  font-size: 1.8rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-color);
  color: white;
  font-weight: 700;
  flex-shrink: 0;
}

/* ==================== TEACHER NOTES ==================== */
.teacher-notes-area {
  position: relative;
}
.teacher-notes-textarea {
  width: 100%;
  min-height: 120px;
  padding: var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  resize: vertical;
  background: var(--bg-card);
  color: var(--text-primary);
  transition: border-color 0.2s;
  box-sizing: border-box;
}
.teacher-notes-textarea:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(168, 200, 232, 0.2);
}
.teacher-notes-status {
  position: absolute;
  right: 12px;
  bottom: 12px;
  font-size: 12px;
  color: var(--text-muted);
  transition: opacity 0.3s;
  pointer-events: none;
}

/* ==================== SELF-GRADE ==================== */
.self-grade-card {
  background: linear-gradient(135deg, var(--accent-light), var(--bg-card));
  border: 2px solid var(--accent-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-top: var(--space-md);
}
.self-grade-input {
  width: 80px;
  text-align: center;
  font-size: 1.2rem;
  font-weight: 700;
  padding: 8px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
}
.self-grade-input:focus {
  border-color: var(--accent-color);
  outline: none;
}

/* ==================== ADMIN TABLE ==================== */
.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}
.admin-table th {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 2px solid var(--border-light);
  color: var(--text-muted);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
}
.admin-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}
.admin-table tr:hover {
  background: var(--bg-secondary);
}

/* ==================== OFFCANVAS THEORIES ==================== */
.theory-offcanvas {
  position: fixed;
  top: 0;
  right: -450px;
  width: 100%;
  max-width: 450px;
  height: 100vh;
  background: var(--bg-card);
  box-shadow: -4px 0 15px rgba(0,0,0,0.1);
  z-index: var(--z-modal);
  display: flex;
  flex-direction: column;
  transition: right var(--transition-spring);
  overflow: hidden;
}
.theory-offcanvas.open {
  right: 0;
}
.theory-offcanvas-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-elevated);
}
.theory-offcanvas-body {
  padding: var(--space-lg);
  overflow-y: auto;
  flex: 1;
}
.theory-offcanvas-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(2px);
  z-index: calc(var(--z-modal) - 1);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
}
.theory-offcanvas-overlay.open {
  opacity: 1;
  visibility: visible;
}

.theory-card-item {
  background: var(--bg-input);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}
.theory-card-item h4 {
  margin-bottom: var(--space-xs);
  color: var(--primary-dark);
}
.theory-card-item .theory-topic {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}
.admin-table td {
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}
.admin-table tr:hover td {
  background: var(--bg-secondary);
}

.badge-wave { background: #e8eaf6; color: #3f51b5; font-size: 13px; font-weight: 600; }

/* ==== Theory Tabs + Chips ==== */
.theory-tabs {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: var(--space-md);
  border-bottom: 2px solid var(--border-light);
}
.theory-tab {
  padding: 6px 14px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius) var(--radius) 0 0;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  white-space: nowrap;
}
.theory-tab:hover { background: var(--bg-secondary); color: var(--text-primary); }
.theory-tab.active {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-bottom: 2px solid var(--primary);
  margin-bottom: -2px;
}
.theory-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--space-lg);
}
.theory-chip {
  padding: 4px 12px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background: var(--bg-card);
  cursor: pointer;
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
}
.theory-chip:hover { border-color: var(--primary); color: var(--primary-dark); }
.theory-chip.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ==== Theory Live Preview ==== */
#theory-live-preview {
  padding: 16px;
  border: 1px dashed var(--border-light);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  min-height: 100px;
  margin-top: var(--space-md);
}
#theory-live-preview:empty::before {
  content: 'Предпросмотр появится здесь...';
  color: var(--text-muted);
  font-style: italic;
}

/* ==== Theory Autocomplete (for adminTaskEdit) ==== */
.theory-autocomplete-wrapper { position: relative; }
.theory-autocomplete-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  max-height: 200px;
  overflow-y: auto;
  z-index: 100;
  display: none;
}
.theory-autocomplete-dropdown.open { display: block; }
.theory-autocomplete-item {
  padding: 8px 12px;
  cursor: pointer;
  font-size: var(--font-size-sm);
}
.theory-autocomplete-item:hover { background: var(--bg-secondary); }
.theory-selected-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}
.theory-selected-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 16px;
  font-size: var(--font-size-xs);
}
.theory-selected-chip .remove-chip {
  cursor: pointer;
  font-weight: bold;
  margin-left: 2px;
  opacity: 0.7;
}
.theory-selected-chip .remove-chip:hover { opacity: 1; }

/* ===== Аватарки и статусы ===== */
.avatar-container {
  position: relative;
  display: inline-block;
}

.status-online {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--success);
  border: 2px solid var(--bg-card);
  box-shadow: 0 0 0 1px rgba(0,0,0,0.1);
}

/* ===== Медали Лидерборда ===== */
.medal-card {
  position: relative;
  overflow: hidden;
}

.medal-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 40px 40px 0;
  z-index: 1;
}

.medal-card::after {
  position: absolute;
  top: 4px;
  right: 6px;
  font-size: 1.2rem;
  z-index: 2;
  line-height: 1;
}

.medal-gold {
  border: 2px solid #FFD700 !important;
  background: linear-gradient(to right, var(--bg-card), rgba(255, 215, 0, 0.05));
}
.medal-gold::before {
  border-color: transparent #FFD700 transparent transparent;
}
.medal-gold::after {
  content: '🥇';
}

.medal-silver {
  border: 2px solid #C0C0C0 !important;
  background: linear-gradient(to right, var(--bg-card), rgba(192, 192, 192, 0.05));
}
.medal-silver::before {
  border-color: transparent #C0C0C0 transparent transparent;
}
.medal-silver::after {
  content: '🥈';
}

.medal-bronze {
  border: 2px solid #CD7F32 !important;
  background: linear-gradient(to right, var(--bg-card), rgba(205, 127, 50, 0.05));
}
.medal-bronze::before {
  border-color: transparent #CD7F32 transparent transparent;
}
.medal-bronze::after {
  content: '🥉';
}

/* ===== INFO TOOLTIP ===== */
.info-tooltip-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--text-muted);
  cursor: help;
  position: relative;
  z-index: 10;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  margin-left: 6px;
  flex-shrink: 0;
}
.info-tooltip-btn svg {
  width: 14px;
  height: 14px;
}
.info-tooltip-btn:hover {
  background: var(--primary-light);
  color: var(--primary-color);
  transform: scale(1.1);
}
.info-tooltip-btn::after {
  content: attr(data-tooltip);
  position: absolute;
  top: calc(100% + 10px);
  bottom: auto;
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  background: var(--bg-card);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-normal);
  line-height: 1.5;
  white-space: pre-wrap;
  width: max-content;
  max-width: 280px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--border-light);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  z-index: 1000;
  text-align: left;
}
/* Small triangle pointer for tooltip */
.info-tooltip-btn::before {
  content: '';
  position: absolute;
  top: calc(100% + 4px);
  bottom: auto;
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  border: 6px solid transparent;
  border-bottom-color: var(--border-light);
  border-top-color: transparent;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  z-index: 1001;
}
.info-tooltip-btn:hover::after,
.info-tooltip-btn:hover::before {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
[data-theme="dark"] .info-tooltip-btn::after {
  background: #2a2a2a;
  border-color: #404040;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}
[data-theme="dark"] .info-tooltip-btn::before {
  border-bottom-color: #404040;
}

/* ===== MODERN TOOLTIP ===== */
.modern-tooltip {
  position: relative;
  cursor: pointer;
}
.modern-tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  background: var(--bg-card);
  color: var(--text-primary);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-normal);
  line-height: 1.4;
  white-space: pre-wrap;
  width: max-content;
  max-width: 250px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--border-light);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: transform var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  z-index: 1000;
  text-align: left;
}
.modern-tooltip:hover::after {
  opacity: 1;
  visibility: visible;
}
.modern-tooltip.tooltip-up::after {
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
}
.modern-tooltip.tooltip-up:hover::after {
  transform: translateX(-50%) translateY(0);
}
.modern-tooltip.tooltip-down::after {
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
}
.modern-tooltip.tooltip-down:hover::after {
  transform: translateX(-50%) translateY(0);
}
[data-theme="dark"] .modern-tooltip::after {
  background: #2a2a2a;
  border-color: #404040;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
}