/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: 1200px;
  margin: 0 auto;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.logo-home-button {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
  text-align: left;
  text-decoration: none;
}

.logo-home-button:hover .logo-icon,
.logo-home-button:focus-visible .logo-icon {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(0, 27, 184, 0.22);
}

.logo-home-button:focus-visible {
  outline: 3px solid rgba(0, 27, 184, 0.24);
  outline-offset: 6px;
  border-radius: 14px;
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: var(--accent);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: #fff;
  transition: transform var(--transition), box-shadow var(--transition);
}

.logo h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  min-width: 0;
  overflow-wrap: anywhere;
}

.logo h1 span {
  color: var(--accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* Menu toggle button */
.menu-toggle-btn {
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  transition: all var(--transition);
  flex-shrink: 0;
}

.menu-toggle-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Side drawer */
.side-drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.side-drawer-overlay.open {
  opacity: 1;
  visibility: visible;
}

.side-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  max-width: 85vw;
  background: var(--bg-card);
  z-index: 201;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
  overflow-y: auto;
}

.side-drawer.open {
  transform: translateX(0);
}

.side-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.side-drawer-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.side-drawer-user-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--accent-light);
}

.side-drawer-user-info {
  flex: 1;
  min-width: 0;
}

.side-drawer-progress {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
}

.side-drawer-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.side-drawer-progress-fill {
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent), var(--green));
  transition: width 0.4s ease;
  width: 0%;
}

.side-drawer-progress-text {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}

.side-drawer-user-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.78rem;
  flex-shrink: 0;
}

.side-drawer-user-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.side-drawer-close {
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all var(--transition);
}

.side-drawer-close:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.side-drawer-body {
  padding: 16px 20px;
  flex: 1;
}

.side-drawer-section {
  margin-bottom: 24px;
}

.side-drawer-section:last-child {
  margin-bottom: 0;
}

.side-drawer-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 10px;
}

.side-drawer .filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.side-drawer-actions {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.side-drawer-action-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 13px 14px;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 500;
  text-align: left;
  transition: background var(--transition), color var(--transition);
}

.side-drawer-action-btn:last-child {
  border-bottom: 0;
}

.side-drawer-action-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.side-drawer-action-icon {
  font-size: 1.1rem;
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.side-drawer-action-value {
  margin-left: auto;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
}

.side-drawer-action-danger {
  color: var(--red);
}

.side-drawer-action-danger:hover {
  background: var(--red-light);
  color: var(--red);
}

.header-controls {
  padding: 0 24px 16px;
  max-width: 1200px;
  margin: 0 auto;
}

.search-box {
  flex: 1;
  min-width: 200px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 10px 42px 10px 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: all var(--transition);
}

.search-box input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }

.search-box::before {
  content: "\1F50D";
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 16px;
  z-index: 1;
}

.search-clear-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 12px;
  transition: background var(--transition), color var(--transition);
}

.search-clear-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.search-clear-btn[hidden] {
  display: none;
}

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

.filter-btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--bg);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
}

.filter-btn:hover { border-color: var(--accent); color: var(--accent); }

.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Dashboard */
.dashboard {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 24px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 8px;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
}

.stat-value.accent { color: var(--accent); }
.stat-value.green { color: var(--green); }
.stat-value.orange { color: var(--orange); }

.progress-bar-container {
  background: var(--bg);
  border-radius: 10px;
  height: 10px;
  margin-top: 10px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--accent), var(--green));
  transition: width 0.5s ease;
}

.motivation-card {
  background: linear-gradient(135deg, var(--accent), var(--purple));
  border-radius: var(--radius);
  padding: 20px 24px;
  color: #fff;
  box-shadow: var(--shadow-md);
}

.motivation-card p {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5;
}

.motivation-card .motivation-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.8;
  margin-bottom: 6px;
}

/* Main content */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 60px;
}

/* Chapter */
.chapter {
  margin-bottom: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition);
}

.chapter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  user-select: none;
  transition: background var(--transition);
  gap: 12px;
  flex-wrap: wrap;
}

.chapter-header:hover { background: var(--accent-light); }

.chapter-left {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 0;
}

.chapter-number {
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.chapter-number.complete {
  background: var(--green);
}

.chapter-info h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.chapter-progress-text {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.chapter-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.chapter-progress-bar {
  width: 100px;
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  overflow: hidden;
}

.chapter-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.4s ease;
}

.chapter-progress-fill.complete { background: var(--green); }

.chapter-toggle {
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.chapter.open .chapter-toggle { transform: rotate(180deg); }

.chapter-actions {
  display: flex;
  gap: 8px;
  padding: 0 24px 12px;
  flex-wrap: wrap;
}

.chapter-action-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
  transition: all var(--transition);
}

.chapter-action-btn:hover { border-color: var(--accent); color: var(--accent); }

.chapter-action-btn.mark-all:hover { border-color: var(--green); color: var(--green); }
.chapter-action-btn.unmark-all:hover { border-color: var(--red); color: var(--red); }

.chapter-body {
  display: none;
  padding: 0 24px 24px;
}

.chapter.open .chapter-body { display: block; }

/* Lesson card */
.lesson-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all var(--transition);
}

.lesson-card:last-child { margin-bottom: 0; }

.lesson-card:hover { box-shadow: var(--shadow-md); }

.lesson-card.completed { border-left: 4px solid var(--green); }

.lesson-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  gap: 12px;
  flex-wrap: wrap;
}

.lesson-header:hover { background: var(--accent-light); }

.lesson-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.lesson-check {
  width: 22px;
  height: 22px;
  border: 2px solid var(--border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 13px;
  transition: all var(--transition);
  cursor: pointer;
  color: transparent;
}

.lesson-card.completed .lesson-check {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.lesson-title {
  font-size: 1rem;
  font-weight: 600;
}

.lesson-card.completed .lesson-title {
  text-decoration: line-through;
  opacity: 0.6;
}

.badge {
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

.badge-beginner { background: var(--green-light); color: var(--green); }
.badge-intermediar { background: var(--orange-light); color: var(--orange); }
.badge-avansat { background: var(--red-light); color: var(--red); }

.lesson-expand-icon {
  font-size: 1rem;
  color: var(--text-muted);
  transition: transform var(--transition);
  flex-shrink: 0;
}

.lesson-card.lesson-open .lesson-expand-icon { transform: rotate(180deg); }

.lesson-body {
  display: none;
  padding: 0 20px 20px;
}

.lesson-card.lesson-open .lesson-body { display: block; }

.lesson-section {
  margin-bottom: 16px;
}

.lesson-section:last-child { margin-bottom: 0; }

.lesson-section h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 6px;
  font-weight: 700;
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
  margin-top: 8px;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: var(--radius-sm);
}

.lesson-section p,
.lesson-section li {
  font-size: 0.9rem;
  color: var(--text);
  line-height: 1.7;
}

.lesson-section ul {
  list-style: none;
  padding: 0;
}

.lesson-section ul li {
  padding: 4px 0 4px 20px;
  position: relative;
}

.lesson-section ul li::before {
  content: "•";
  position: absolute;
  left: 4px;
  color: var(--accent);
  font-weight: 700;
}

.checklist { margin-top: 8px; }

.checklist-progress {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: 0;
  margin-left: 6px;
}

.checklist-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  font-size: 0.85rem;
  transition: background var(--transition);
  cursor: pointer;
}

.checklist-item:hover {
  background: var(--accent-light);
}

.checklist-item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.learn-toggle {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.learn-toggle:hover { background: var(--accent); color: #fff; }
.lesson-card.completed .learn-toggle { background: var(--green-light); }
.lesson-card.completed .learn-toggle:hover { background: var(--green); color: #fff; }

.learn-toggle input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--green);
  cursor: pointer;
}

.learn-toggle span {
  font-weight: 600;
  font-size: 0.9rem;
}

/* No results */
.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.no-results .emoji { font-size: 3rem; margin-bottom: 12px; }
.no-results p { font-size: 1rem; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Responsive */
@media (max-width: 768px) {
  .header-top { padding: 12px 16px; }
  .header-controls { padding: 0 16px 12px; }
  .logo h1 { font-size: 1rem; }
  .logo-icon { width: 36px; height: 36px; font-size: 18px; }
  .dashboard { padding: 0 16px; margin: 16px auto; }
  .dashboard-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat-card { padding: 14px; }
  .stat-value { font-size: 1.3rem; }
  .main { padding: 0 16px 40px; }
  .chapter-header { padding: 14px 16px; }
  .chapter-number { width: 30px; height: 30px; font-size: 0.8rem; }
  .chapter-info h2 { font-size: 0.95rem; }
  .chapter-progress-bar { width: 60px; }
  .chapter-actions { padding: 0 16px 10px; }
  .chapter-body { padding: 0 16px 16px; }
  .lesson-header { padding: 12px 14px; }
  .lesson-body { padding: 0 14px 14px; }
  .lesson-title { font-size: 0.9rem; }
  .filter-btn { padding: 6px 12px; font-size: 0.75rem; }
}

@media (max-width: 480px) {
  .dashboard-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .chapter-right { display: none; }
}

/* User badge in header */
.user-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--accent-light);
  border: 1px solid var(--accent);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  max-width: 180px;
}

.user-badge span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.user-badge-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.7rem;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .user-badge span { display: none; }
  .user-badge { padding: 6px; border-radius: 50%; }
}

.app-content { display: none; }
.app-content.visible { display: block; }