:root {
  --bg: #0c1017;
  --bg-soft: #121820;
  --bg-card: #161d28;
  --border: rgba(148, 163, 184, 0.18);
  --text: #e8edf5;
  --muted: #94a3b8;
  --accent: #5eead4;
  --accent-dim: #2dd4bf;
  --accent-glow: rgba(94, 234, 212, 0.15);
  --font-sans: "Outfit", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --font-display: "Space Grotesk", var(--font-sans);
  --max: 1180px;
  --radius: 10px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: rgba(12, 16, 23, 0.92);
  backdrop-filter: blur(12px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #fff;
  transition: color 0.2s;
}

.brand:hover .brand-name { color: var(--accent); }

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav {
  display: none;
  margin-left: auto;
  gap: 0.15rem;
}

.nav a {
  padding: 0.45rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border: 1px solid var(--accent-dim);
  border-radius: 6px;
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
  transition: filter 0.2s, transform 0.15s;
}

.btn:hover { filter: brightness(1.08); }

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

.btn-outline {
  background: transparent;
  color: var(--accent);
}

.btn-sm { padding: 0.4rem 0.85rem; font-size: 0.72rem; }

.header-cta { display: none; margin-left: 0.5rem; }

.menu-toggle {
  display: flex;
  margin-left: auto;
  width: 2.5rem;
  height: 2.5rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: 0.5rem 0 1rem;
  border-top: 1px solid var(--border);
}

.mobile-nav.open { display: flex; }

.mobile-nav a {
  padding: 0.65rem 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

@media (min-width: 900px) {
  .nav { display: flex; }
  .header-cta { display: inline-flex; }
  .menu-toggle { display: none; }
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--border);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 80% 20%, var(--accent-glow), transparent),
    radial-gradient(ellipse 40% 40% at 10% 80%, rgba(59, 130, 246, 0.08), transparent);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-grid { grid-template-columns: 1.1fr 0.9fr; }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 0.35rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(94, 234, 212, 0.25);
  border-radius: 999px;
  background: rgba(94, 234, 212, 0.06);
}

.hero h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.hero h1 span { color: var(--accent); }

.hero-lead {
  margin: 0 0 1.75rem;
  max-width: 34rem;
  font-size: 1.05rem;
  color: var(--muted);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.hero-panel {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.panel-label {
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.code-block {
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: #cbd5e1;
  background: #0a0e14;
  border-radius: 6px;
  overflow-x: auto;
}

.code-block .kw { color: #c084fc; }
.code-block .fn { color: var(--accent); }
.code-block .str { color: #fbbf24; }
.code-block .cm { color: #64748b; }

/* Stats */
.stats-bar {
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 700px) {
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
}

.stat {
  padding: 1.1rem 1rem;
  border-right: 1px solid var(--border);
}

.stat:last-child { border-right: none; }

.stat-value {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  margin-top: 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section-header {
  margin-bottom: 2.5rem;
  max-width: 40rem;
}

.section-header h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
}

.section-header p {
  margin: 0;
  color: var(--muted);
}

/* Cards */
.cards {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 700px) {
  .cards { grid-template-columns: repeat(3, 1fr); }
}

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

.card:hover {
  border-color: rgba(94, 234, 212, 0.35);
  transform: translateY(-2px);
}

.card-icon {
  display: flex;
  width: 2.5rem;
  height: 2.5rem;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  border: 1px solid rgba(94, 234, 212, 0.3);
  border-radius: 6px;
  background: var(--accent-glow);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}

.card-meta {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--accent-dim);
}

/* Features */
.features-grid {
  display: grid;
  gap: 2rem;
}

@media (min-width: 800px) {
  .features-grid { grid-template-columns: 1fr 1fr; align-items: center; }
}

.feature-list {
  display: grid;
  gap: 1rem;
}

.feature-item {
  display: flex;
  gap: 0.85rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-soft);
}

.feature-dot {
  flex-shrink: 0;
  width: 0.5rem;
  height: 0.5rem;
  margin-top: 0.45rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.feature-item h4 {
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
}

.feature-item p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

/* Testimonials */
.testimonials {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 700px) {
  .testimonials { grid-template-columns: repeat(2, 1fr); }
}

.quote {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
}

.quote p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  font-style: italic;
  color: #cbd5e1;
}

.quote-author {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.quote-author strong { color: var(--accent); display: block; margin-bottom: 0.15rem; }

/* CTA */
.cta-band {
  padding: 3.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(94, 234, 212, 0.08), rgba(59, 130, 246, 0.05));
  text-align: center;
}

.cta-band h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.cta-band p {
  margin: 0 auto 1.5rem;
  max-width: 32rem;
  color: var(--muted);
}

/* Footer */
.site-footer {
  padding: 3rem 0 2rem;
  background: var(--bg-soft);
}

.footer-grid {
  display: grid;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (min-width: 700px) {
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }
}

.footer-brand p {
  margin: 0.75rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
  max-width: 22rem;
}

.footer-col h5 {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.footer-col a {
  display: block;
  padding: 0.3rem 0;
  font-size: 0.88rem;
  color: var(--muted);
  transition: color 0.2s;
}

.footer-col a:hover { color: var(--text); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
}

/* Inner pages */
.page-hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.page-hero p {
  margin: 0;
  max-width: 36rem;
  color: var(--muted);
}

.prose {
  max-width: 42rem;
}

.prose h2 {
  margin: 2rem 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.prose p, .prose li {
  color: var(--muted);
  font-size: 0.95rem;
}

.prose ul { padding-left: 1.25rem; }

/* Contact form */
.form-card {
  max-width: 32rem;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.7rem 0.85rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent-dim);
}

.form-group textarea { min-height: 120px; resize: vertical; }

.form-success {
  display: none;
  padding: 1rem;
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--accent);
  border: 1px solid rgba(94, 234, 212, 0.3);
  border-radius: 6px;
  background: var(--accent-glow);
}

.form-success.show { display: block; }

/* Course detail */
.course-hero-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.badge {
  padding: 0.3rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(94, 234, 212, 0.25);
  border-radius: 999px;
}