/* Learn Page Styles */

.learn-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 32px;
}
.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  flex: 1;
  max-width: 320px;
  transition: var(--transition);
}
.search-box:focus-within {
  border-color: var(--purple);
  box-shadow: 0 0 0 3px rgba(167,139,250,0.1);
}
.search-box input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font-main);
  width: 100%;
}
.search-box input::placeholder { color: var(--text-muted); }

.filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.filter-tab {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
}
.filter-tab:hover, .filter-tab.active {
  background: rgba(167,139,250,0.15);
  border-color: rgba(167,139,250,0.3);
  color: var(--purple);
}

/* Layout */
.learn-container {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 0;
  min-height: calc(100vh - var(--nav-height));
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px 60px;
  position: relative;
  z-index: 1;
}

/* Sidebar */
.modules-sidebar {
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  overflow-y: auto;
  padding: 24px 16px 24px 0;
  scrollbar-width: thin;
  scrollbar-color: rgba(167,139,250,0.3) transparent;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-section { margin-bottom: 8px; }
.ss-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  margin-bottom: 4px;
}
.ss-tag {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 100px;
  border: 1px solid rgba(167,139,250,0.3);
  background: rgba(167,139,250,0.1);
  color: var(--purple);
}
.ss-count {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.lesson-list { display: flex; flex-direction: column; gap: 2px; }
.lesson-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}
.lesson-item:hover {
  background: var(--bg-card);
  border-color: var(--border);
}
.lesson-item.active {
  background: rgba(167,139,250,0.1);
  border-color: rgba(167,139,250,0.25);
}
.li-status {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: var(--transition);
}
.li-status.done {
  background: rgba(52,211,153,0.15);
  border-color: rgba(52,211,153,0.4);
  color: var(--green);
}
.lesson-item.active .li-status {
  background: rgba(167,139,250,0.2);
  border-color: rgba(167,139,250,0.5);
  color: var(--purple);
}
.li-info { display: flex; flex-direction: column; gap: 2px; }
.li-title { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); line-height: 1.3; }
.li-meta { font-size: 0.72rem; color: var(--text-muted); }

/* Lesson Content */
.lesson-content {
  padding: 32px 0 32px 40px;
  max-width: 760px;
}
.lesson-header { margin-bottom: 32px; }
.lh-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.lh-time { font-size: 0.85rem; color: var(--text-muted); }
.lesson-title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}
.lesson-progress-bar {
  height: 3px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  overflow: hidden;
}
.lpb-fill {
  height: 100%;
  background: var(--gradient-main);
  border-radius: 3px;
  transition: width 0.8s ease;
}

/* Lesson Body */
.lesson-body { display: flex; flex-direction: column; gap: 40px; }

.lesson-section h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.lesson-section p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}
.lesson-section p strong { color: var(--text-primary); }
.lesson-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}
.lesson-list li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

/* Concept Card */
.concept-card {
  padding: 24px;
  background: color-mix(in srgb, var(--cc-color) 8%, var(--bg-card));
  border: 1px solid color-mix(in srgb, var(--cc-color) 30%, transparent);
  border-radius: var(--radius-lg);
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.cc-icon { font-size: 2.5rem; flex-shrink: 0; }
.cc-content h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--cc-color); }
.cc-content p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6; margin: 0; }

/* Hierarchy Viz */
.hierarchy-viz {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
}
.hv-item {
  width: var(--w);
  padding: 16px 20px;
  background: var(--col);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.hv-item:hover {
  border-left-color: var(--purple);
}
.hv-label { font-size: 0.95rem; font-weight: 700; margin-bottom: 4px; }
.hv-desc { font-size: 0.82rem; color: var(--text-secondary); }

/* Types Grid */
.types-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 16px; }
.type-card {
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: var(--transition);
}
.type-card:hover { border-color: var(--border-hover); transform: translateY(-2px); }
.tc-icon { font-size: 2rem; }
.type-card h4 { font-size: 0.95rem; font-weight: 700; }
.type-card p { font-size: 0.83rem; color: var(--text-secondary); line-height: 1.5; flex: 1; }

/* Apps Showcase */
.apps-showcase { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 16px; }
.app-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}
.app-item:hover { border-color: var(--border-hover); }
.app-item > span { font-size: 1.8rem; flex-shrink: 0; }
.app-item strong { display: block; font-size: 0.9rem; font-weight: 700; margin-bottom: 4px; }
.app-item p { font-size: 0.8rem; color: var(--text-secondary); margin: 0; }

/* Inline Quiz */
.inline-quiz {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.iq-question { font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
.iq-options { display: flex; flex-direction: column; gap: 10px; }
.iq-btn {
  padding: 12px 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-align: left;
  transition: var(--transition);
  font-family: var(--font-main);
}
.iq-btn:hover:not(:disabled) { background: rgba(167,139,250,0.1); border-color: rgba(167,139,250,0.3); color: var(--text-primary); }
.iq-btn.correct { background: rgba(52,211,153,0.15); border-color: rgba(52,211,153,0.4); color: var(--green); }
.iq-btn.wrong { background: rgba(248,113,113,0.1); border-color: rgba(248,113,113,0.3); color: #f87171; }

/* Lesson Actions */
.lesson-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-complete {
  padding: 14px 28px;
  background: var(--gradient-green);
  color: white;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: var(--transition);
  font-family: var(--font-main);
}
.btn-complete:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(52,211,153,0.3); }
.btn-complete.completed {
  background: rgba(52,211,153,0.15);
  color: var(--green);
  border: 1px solid rgba(52,211,153,0.3);
}
.btn-next {
  padding: 14px 28px;
  background: rgba(167,139,250,0.1);
  border: 1px solid rgba(167,139,250,0.25);
  color: var(--purple);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  transition: var(--transition);
  font-family: var(--font-main);
}
.btn-next:hover {
  background: var(--gradient-main);
  color: white;
  border-color: transparent;
}

/* Responsive */
@media (max-width: 900px) {
  .learn-container { grid-template-columns: 1fr; padding: 0 20px 60px; }
  .modules-sidebar { position: static; height: auto; border-right: none; border-bottom: 1px solid var(--border); padding: 16px 0; }
  .lesson-content { padding: 24px 0; }
  .types-grid { grid-template-columns: 1fr; }
  .apps-showcase { grid-template-columns: 1fr; }
}