:root {
  color-scheme: dark;
  --bg: #070a0f;
  --surface: rgba(14, 20, 29, 0.82);
  --surface-strong: rgba(20, 31, 43, 0.96);
  --line: rgba(148, 163, 184, 0.22);
  --text: #eef4ff;
  --muted: #a8b3c4;
  --accent: #20d9a1;
  --accent-2: #45a3ff;
  --warning: #f7c948;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 20% 10%, rgba(32, 217, 161, 0.16), transparent 28rem),
    radial-gradient(circle at 85% 25%, rgba(69, 163, 255, 0.14), transparent 26rem),
    var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow-x: hidden;
}

#networkCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.45;
  pointer-events: none;
  z-index: -1;
}

.navbar {
  background: rgba(7, 10, 15, 0.78);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  transition: background 180ms ease, box-shadow 180ms ease;
}

.navbar.nav-scrolled {
  background: rgba(7, 10, 15, 0.94);
  box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.24);
}

.navbar-brand {
  letter-spacing: 0;
}

.nav-link {
  color: rgba(238, 244, 255, 0.78);
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent);
}

.hero-section {
  min-height: 92vh;
  padding: 8rem 0 5rem;
}

.hero-copy {
  max-width: 44rem;
  color: var(--muted);
}

.eyebrow {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.btn {
  border-radius: 0.45rem;
  font-weight: 700;
}

.btn-accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #05100c;
}

.btn-accent:hover,
.btn-accent:focus {
  background: #5be7bd;
  border-color: #5be7bd;
  color: #05100c;
}

.terminal-panel {
  background: linear-gradient(145deg, rgba(12, 19, 28, 0.96), rgba(21, 31, 43, 0.86));
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  box-shadow: 0 2rem 5rem rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  gap: 0.5rem;
  padding: 0.9rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid var(--line);
}

.terminal-bar span {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--accent);
}

.terminal-bar span:nth-child(2) {
  background: var(--warning);
}

.terminal-bar span:nth-child(3) {
  background: var(--accent-2);
}

.terminal-panel pre {
  min-height: 17rem;
  margin: 0;
  padding: 1.4rem;
  color: #d8fdea;
  font-size: clamp(0.9rem, 1vw, 1rem);
  line-height: 1.75;
  white-space: pre-wrap;
}

.section-pad {
  padding: 6rem 0;
}

.section-band {
  background: rgba(5, 8, 13, 0.66);
  border-block: 1px solid var(--line);
}

.text-secondary {
  color: var(--muted) !important;
}

.learning-card,
.focus-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.learning-card {
  display: flex;
  flex-direction: column;
  padding: 1.35rem;
}

.learning-card:hover,
.focus-item:hover {
  transform: translateY(-0.25rem);
  border-color: rgba(32, 217, 161, 0.55);
  background: var(--surface-strong);
}

.card-number {
  width: fit-content;
  margin-bottom: 1rem;
  padding: 0.3rem 0.62rem;
  border: 1px solid rgba(32, 217, 161, 0.46);
  border-radius: 999px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
}

.learning-card h3,
.focus-item h3 {
  margin-bottom: 0.75rem;
  font-size: 1.12rem;
  font-weight: 800;
}

.learning-card p,
.focus-item p {
  color: var(--muted);
}

.learning-card ul {
  margin: auto 0 0;
  padding-left: 1.15rem;
  color: #d8e4f3;
}

.learning-card li + li {
  margin-top: 0.35rem;
}

.focus-item {
  height: 100%;
  padding: 1.25rem;
}

.focus-item span {
  display: inline-block;
  margin-bottom: 0.9rem;
  color: var(--accent-2);
  font-weight: 900;
}

.footer-section {
  padding: 3.5rem 0;
  background: rgba(7, 10, 15, 0.9);
}

address {
  color: var(--muted);
  line-height: 1.8;
}

@media (max-width: 991.98px) {
  .hero-section {
    min-height: auto;
    padding-top: 7.5rem;
  }

  .terminal-panel pre {
    min-height: 13rem;
  }
}

@media (max-width: 575.98px) {
  .display-4 {
    font-size: 2.3rem;
  }

  .section-pad {
    padding: 4.5rem 0;
  }
}