.typing-text_matrix { color: var(--primary-light); font-weight: 600; }

.matrix-layout { display: flex; gap: 2rem; align-items: flex-start; }

.matrix-sidebar {
  position: sticky; top: 100px; width: 240px; flex-shrink: 0;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: 16px; padding: 1.25rem 0; backdrop-filter: blur(10px);
}
.matrix-sidebar-title {
  font-size: 0.75rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--text-secondary);
  padding: 0 1.25rem 0.75rem; border-bottom: 1px solid var(--glass-border); margin-bottom: 0.5rem;
}
.matrix-sidebar-nav { list-style: none; padding: 0; margin: 0; }
.matrix-sidebar-nav li a {
  display: flex; align-items: center; gap: 0.6rem; padding: 0.55rem 1.25rem;
  font-size: 0.85rem; color: var(--text-secondary); text-decoration: none;
  transition: all 0.2s ease; border-left: 3px solid transparent;
}
.matrix-sidebar-nav li a:hover, .matrix-sidebar-nav li a.active {
  color: var(--primary-light); background: rgba(139,92,246,0.08); border-left-color: var(--primary);
}
.matrix-sidebar-nav li a .nav-icon { width: 20px; text-align: center; font-size: 0.9rem; }
.matrix-main-content { flex: 1; min-width: 0; }

.matrix-lesson {
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: 16px; padding: 2.5rem; margin-bottom: 2rem;
  backdrop-filter: blur(10px); transition: border-color 0.3s ease;
}
.matrix-lesson:target { border-color: var(--primary); }
.matrix-lesson-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; }
.matrix-lesson-number {
  font-family: Orbitron, sans-serif; font-size: 1.5rem; font-weight: 700;
  background: var(--gradient-1); -webkit-background-clip: text; -webkit-text-fill-color: transparent; flex-shrink: 0;
}
.matrix-lesson-header h3 { font-size: 1.4rem; font-weight: 700; color: var(--text-primary); margin: 0; }
.matrix-lesson p, .matrix-lesson li { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.75; margin-bottom: 0.75rem; }
.matrix-lesson ul, .matrix-lesson ol { padding-left: 1.5rem; margin-bottom: 1rem; }
.matrix-lesson li { margin-bottom: 0.4rem; }
.matrix-lesson strong { color: var(--text-primary); }

.matrix-concept-card {
  background: var(--dark-surface); border: 1px solid var(--glass-border);
  border-radius: 12px; padding: 1.25rem 1.5rem; margin: 1rem 0;
}
.matrix-concept-card h4 { font-size: 1rem; font-weight: 600; color: var(--accent); margin: 0 0 0.5rem; }
.matrix-concept-card p { margin-bottom: 0; }

.matrix-code-block {
  position: relative; margin: 1rem 0 1.5rem; border-radius: 12px;
  overflow: hidden; border: 1px solid var(--glass-border);
}
.matrix-code-header {
  display: flex; justify-content: space-between; align-items: center;
  background: rgba(0,0,0,0.3); padding: 0.5rem 1rem; border-bottom: 1px solid var(--glass-border);
}
.matrix-code-lang {
  font-family: "Fira Code", monospace; font-size: 0.75rem; font-weight: 500;
  color: var(--primary-light); text-transform: uppercase; letter-spacing: 0.05em;
}
.matrix-code-copy {
  background: none; border: 1px solid var(--glass-border); color: var(--text-secondary);
  font-size: 0.75rem; padding: 0.25rem 0.6rem; border-radius: 6px; cursor: pointer;
  font-family: Poppins, sans-serif; transition: all 0.2s ease;
}
.matrix-code-copy:hover { color: var(--text-primary); border-color: var(--primary-light); }
.matrix-code-copy.copied { color: #22c55e; border-color: #22c55e; }
.matrix-code-block pre { margin: 0; padding: 1.25rem 1.5rem; background: #0d1117; overflow-x: auto; }
.matrix-code-block code { font-family: "Fira Code", Consolas, Monaco, monospace; font-size: 0.85rem; line-height: 1.7; color: #e6edf3;}
.matrix-code-block .tok-kw { color: #c792ea; font-weight: bold; }
.matrix-code-block .tok-fn { color: #82aaff; }
.matrix-code-block .tok-str { color: #c3e88d; }
.matrix-code-block .tok-num { color: #f78c6c; }
.matrix-code-block .tok-cmt { color: #546e7a; font-style: italic; }
.matrix-code-block .tok-var { color: #f07178; }

.matrix-exercise {
  background: rgba(34,197,94,0.06); border: 1px solid rgba(34,197,94,0.25);
  border-radius: 12px; padding: 1.5rem; margin: 1.5rem 0;
}
.matrix-exercise-title { display: flex; align-items: center; gap: 0.5rem; font-size: 1rem; font-weight: 600; color: #22c55e; margin-bottom: 0.75rem; }
.matrix-exercise-toggle {
  background: rgba(34,197,94,0.15); border: 1px solid rgba(34,197,94,0.3);
  color: #22c55e; font-family: Poppins, sans-serif; font-size: 0.85rem; font-weight: 500;
  padding: 0.4rem 1rem; border-radius: 8px; cursor: pointer; transition: all 0.2s ease;
}
.matrix-exercise-toggle:hover { background: rgba(34,197,94,0.25); }
.matrix-exercise-solution { display: none; margin-top: 1rem; padding-top: 1rem; border-top: 1px solid rgba(34,197,94,0.2); }
.matrix-exercise-solution.visible { display: block; }
.matrix-exercise-solution p { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 0.5rem; }

.matrix-callout {
  display: flex; gap: 1rem; align-items: flex-start;
  background: rgba(139,92,246,0.06); border: 1px solid rgba(139,92,246,0.25);
  border-radius: 12px; padding: 1.25rem 1.5rem; margin: 1.25rem 0;
}
.matrix-callout-icon { font-size: 1.3rem; flex-shrink: 0; line-height: 1.4; }
.matrix-callout p { margin: 0; font-size: 0.9rem; line-height: 1.6; }

.matrix-table-wrap { overflow-x: auto; margin: 1.25rem 0 1.75rem; border-radius: 12px; border: 1px solid var(--glass-border); }
.matrix-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.matrix-table th { background: rgba(139,92,246,0.15); color: var(--primary-light); font-weight: 600; text-align: left; padding: 0.75rem 1rem; }
.matrix-table td { padding: 0.65rem 1rem; border-top: 1px solid var(--glass-border); color: var(--text-secondary); }
.matrix-table tr:hover td { background: rgba(255,255,255,0.02); }

.matrix-progress-bar {
  display: flex; align-items: center; gap: 1rem; margin: 2rem 0;
  padding: 1.25rem 1.5rem; background: var(--glass-bg);
  border: 1px solid var(--glass-border); border-radius: 12px; backdrop-filter: blur(10px);
}
.matrix-progress-track { flex: 1; height: 8px; background: var(--dark-surface); border-radius: 99px; overflow: hidden; }
.matrix-progress-fill { height: 100%; width: 0%; background: var(--gradient-4); border-radius: 99px; transition: width 0.5s ease; }
.matrix-progress-text { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); white-space: nowrap; }

@media (max-width: 1024px) { .matrix-sidebar { display: none; } }
@media (max-width: 768px) {
  .matrix-lesson { padding: 1.5rem; }
  .matrix-lesson-header h3 { font-size: 1.15rem; }
  .matrix-code-block pre { padding: 1rem; }
  .matrix-code-block code { font-size: 0.78rem; }
  .matrix-progress-bar { flex-direction: column; align-items: stretch; gap: 0.5rem; }
  .matrix-progress-text { text-align: center; }
  .matrix-callout { flex-direction: column; gap: 0.5rem; }
}
@media (max-width: 480px) {
  .matrix-lesson { padding: 1.25rem; border-radius: 12px; }
  .matrix-lesson-header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .matrix-exercise { padding: 1rem; }
}
.matrix-sidebar-nav li a:focus-visible,
.matrix-code-copy:focus-visible,
.matrix-exercise-toggle:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
@media print {
  .matrix-sidebar, .matrix-progress-bar, .matrix-exercise-toggle, .matrix-code-copy, .navbar, .footer { display: none !important; }
  .matrix-lesson { break-inside: avoid; border: 1px solid #ccc; }
  .matrix-code-block pre { background: #f5f5f5; color: #333; }
}