/* NeUniversity — Technical education theme */
:root {
  --bg: #0f1216;
  --bg-card: #161b22;
  --bg-elevated: #1c2128;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #f59e0b;
  --accent-dim: #d97706;
  --accent-soft: rgba(245, 158, 11, 0.15);
  --teal: #2dd4bf;
  --teal-soft: rgba(45, 212, 191, 0.12);
  --border: #30363d;
  --radius: 12px;
  --font-sans: 'Outfit', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main {
  flex: 1;
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 1rem 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 1.2rem;
}

.logo-icon {
  color: var(--accent);
  font-size: 1.4rem;
}

.nav {
  display: flex;
  gap: 1.5rem;
  margin-left: 1.5rem;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 3rem 0 4rem;
}

@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero-tagline {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin: 0 0 1.75rem;
  max-width: 28ch;
}

@media (max-width: 768px) {
  .hero-tagline {
    margin-left: auto;
    margin-right: auto;
  }
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .hero-cta {
    justify-content: center;
  }
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #0f1216;
}

.btn-primary:hover {
  box-shadow: 0 4px 20px var(--accent-soft);
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Circuit mock visual */
.hero-visual {
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.circuit-mock {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.circuit-mock::before,
.circuit-mock::after {
  content: '';
  position: absolute;
  background: var(--accent-soft);
  border-radius: 2px;
}

.circuit-mock::before {
  width: 60%;
  height: 3px;
  top: 30%;
  left: 15%;
}

.circuit-mock::after {
  width: 3px;
  height: 50%;
  left: 40%;
  top: 25%;
}

/* Features */
.features {
  padding: 2rem 0;
}

.features h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 1.5rem;
  color: var(--text);
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.feature-icon {
  font-size: 1.75rem;
  display: block;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0 0 1rem;
}

.link-arrow {
  color: var(--teal);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
}

.link-arrow:hover {
  text-decoration: underline;
}

/* Page hero (inner pages) */
.page-hero {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.page-hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0;
}

.content-block {
  padding: 2rem 0;
}

.content-block h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

.content-block p {
  margin: 0 0 1rem;
  color: var(--text-muted);
}

.content-block p strong,
.topic-list strong {
  color: var(--text);
}

.topic-list {
  margin: 0 0 1.5rem;
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.topic-list li {
  margin-bottom: 0.5rem;
}

.content-block a:not(.btn) {
  color: var(--teal);
  text-decoration: none;
}

.content-block a:not(.btn):hover {
  text-decoration: underline;
}

.cta-p {
  margin-top: 1.5rem !important;
}

/* Footer */
.site-footer {
  margin-top: auto;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  font-weight: 500;
  margin: 0 0 0.25rem;
}

.footer-legal {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}