body {
  background: linear-gradient(
    180deg,
    var(--bg-primary)
   
  );
  color: var(--text-primary);
  font-family: var(--font-primary);
}
.system-roadmap {
  padding-top: 90px; 
}

.system-hero {
  background: radial-gradient(
    circle at top,
    rgba(56, 189, 248, 0.08),
    transparent 60%
  );
}

.system-hero {
  padding: var(--spacing-xxl) var(--spacing-md) calc(var(--spacing-xxl) * 1.2);
  text-align: center;
  position: relative;
}

.system-title {
  font-family: var(--font-hud);
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  letter-spacing: 1.5px;
  color: var(--accent-primary);
}

.system-subtitle {
  margin-top: var(--spacing-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.hero-meta {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  flex-wrap: wrap;
}

.hero-meta span {
  font-size: 0.75rem;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  font-family: var(--font-hud);
}
.system-timeline {
  max-width: 900px;
  margin: auto;
  padding: var(--spacing-xxl) var(--spacing-md);
  position: relative;
}

.system-timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  height: 100%;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--accent-color),
    transparent
  );
  transform: translateX(-50%);
  opacity: 0.35;
}
.timeline-node {
  display: flex;
  gap: var(--spacing-xl);
  align-items: flex-start;
  margin-bottom: calc(var(--spacing-xxl) * 1.2);
  position: relative;
}

.timeline-node:nth-child(even) {
  flex-direction: row-reverse;
}
.node-index {
  font-family: var(--font-hud);
  font-size: 0.85rem;
  color: var(--accent-color);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: 50%;
  box-shadow: var(--shadow);
}
.node-card {
  background: var(--card-bg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  width: 100%;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  transition: all 0.35s ease;
  position: relative;
}

.node-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    120deg,
    transparent,
    rgba(0, 170, 255, 0.08),
    transparent
  );
  opacity: 0;
  transition: opacity 0.35s ease;
}

.node-card:hover::after {
  opacity: 1;
}

.node-card:hover {
  transform: var(--hover-transform-strong);
  box-shadow: var(--shadow-hover-strong);
  border-color: var(--accent-color);
}
.node-card h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  margin-bottom: var(--spacing-xs);
  color: var(--accent-primary);
}

.node-card p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  font-size: 0.95rem;
}

.node-card ul {
  padding-left: var(--spacing-md);
}

.node-card ul li {
  margin-bottom: 6px;
  font-size: 0.9rem;
}
.related-courses {
  padding: calc(var(--spacing-xxl) * 1.3) var(--spacing-md);
  background: linear-gradient(
    180deg,
    var(--bg-secondary),
    var(--bg-primary)
  );
  text-align: center;
}

.related-courses h2 {
  font-size: 1.7rem;
  margin-bottom: var(--spacing-xl);
  color: var(--accent-secondary);
}
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-xl);
  max-width: 900px;
  margin: auto;
}
.course-card {
  background: var(--card-bg);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-xl) var(--spacing-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.35s ease;
}

.course-card i {
  font-size: 2.2rem;
  color: var(--accent-color);
  margin-bottom: var(--spacing-sm);
}

.course-card h4 {
  font-size: 1.1rem;
  margin-bottom: 2px;
}

.course-card span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.course-card:hover {
  transform: var(--hover-transform);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-color);
}
@media (max-width: 768px) {
  .system-timeline::before {
    left: 24px;
  }

  .timeline-node,
  .timeline-node:nth-child(even) {
    flex-direction: row;
  }

  .node-index {
    margin-left: -6px;
  }
}

/* =========================================
   FIX: Explore Other Courses Layout
   ========================================= */

.skill-path-wrapper {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 20px;
}

.skill-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 180px;
  padding: 20px;
  background: var(--glass-bg);
  border: 1px solid #333;
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.3s ease;
  backdrop-filter: blur(5px);
}

.skill-node:hover {
  transform: translateY(-5px);
  border-color: var(--sys-purple);
  box-shadow: 0 8px 20px rgba(168, 85, 247, 0.15);
}

.node-icon {
  font-size: 2.5rem;
  color: var(--sys-indigo);
  margin-bottom: 12px;
  transition: color 0.3s ease;
}

.skill-node:hover .node-icon {
  color: var(--sys-purple);
}

.skill-node h4 {
  color: #fff;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  margin: 8px 0;
  text-align: center;
}

.node-level {
  font-size: 0.75rem;
  color: #888;
  font-family: 'JetBrains Mono', monospace;
  background: rgba(255, 255, 255, 0.05);
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}