.subsection-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
  margin: 3rem 0 1.5rem;
  padding-left: 1rem;
  border-left: 4px solid var(--primary);
}

.sd-topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.sd-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 1.5rem;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.sd-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-3);
}

.sd-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--glass-shadow);
  border-color: var(--accent);
}

.sd-card-icon {
  font-size: 2rem;
  margin-bottom: 0.8rem;
}

.sd-card h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.sd-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.sd-problems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.sd-problem-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 1.5rem;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.sd-problem-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--glass-shadow);
  border-color: var(--primary-light);
}

.sd-problem-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
  flex-wrap: wrap;
}

.sd-problem-icon {
  font-size: 1.5rem;
}

.sd-problem-header h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

.sd-problem-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.sd-problem-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.sd-tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.sd-tip {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 1.5rem;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.sd-tip:hover {
  transform: translateY(-4px);
  border-color: var(--primary-light);
}

.sd-tip-number {
  font-family: "Orbitron", sans-serif;
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  flex-shrink: 0;
  line-height: 1;
}

.sd-tip h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.sd-tip p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .sd-topics-grid,
  .sd-problems-grid,
  .sd-tips-grid {
    grid-template-columns: 1fr;
  }
}

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