:root {
  --bg: #070a0f;
  --surface: #0d1117;
  --surface-2: #121826;
  --card: rgba(17, 24, 39, 0.82);
  --border: rgba(148, 163, 184, 0.18);
  --border-hi: rgba(229, 57, 53, 0.45);
  --text: #e5edf7;
  --muted: #95a3b8;
  --dim: #64748b;
  --red: #e53935;
  --red-soft: rgba(229, 57, 53, 0.14);
  --orange: #f97316;
  --green: #22c55e;
  --teal: #06d6a0;
  --blue: #3b82f6;
  --purple: #a855f7;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 0%, rgba(229, 57, 53, 0.16), transparent 32rem),
    radial-gradient(circle at 90% 18%, rgba(6, 214, 160, 0.10), transparent 28rem),
    linear-gradient(180deg, #070a0f 0%, #0a0f18 48%, #070a0f 100%);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 100vh;
}

a { color: inherit; }
.back-link {
  position: fixed;
  left: 22px;
  bottom: 22px;
  z-index: 20;
  padding: 10px 16px;
  border-radius: 999px;
  text-decoration: none;
  background: rgba(13, 17, 23, 0.92);
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 800;
  font-size: 13px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.hero-shell { padding: 92px 24px 40px; }
.hero-grid {
  width: min(1160px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 34px;
  align-items: center;
}
.eyebrow {
  color: var(--teal);
  font: 700 0.78rem/1 JetBrains Mono, monospace;
  letter-spacing: 0.08em;
  text-transform: lowercase;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  font-size: clamp(3.2rem, 9vw, 7.8rem);
  line-height: 0.88;
  letter-spacing: -0.08em;
  margin: 18px 0 24px;
}
h1 span { color: var(--red); text-shadow: 0 0 34px rgba(229, 57, 53, 0.2); }
.hero-sub {
  max-width: 680px;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.28rem);
  line-height: 1.65;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 900;
  border: 1px solid var(--border);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary { background: var(--red); border-color: rgba(255,255,255,0.16); color: white; box-shadow: 0 16px 50px rgba(229, 57, 53, 0.25); }
.btn.ghost { background: rgba(255,255,255,0.04); color: var(--text); }

.terminal-card {
  border: 1px solid var(--border-hi);
  background: rgba(8, 13, 20, 0.88);
  border-radius: 22px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.terminal-top {
  height: 44px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.035);
}
.terminal-top span { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.terminal-top span:nth-child(1) { background: #ff5f56; }
.terminal-top span:nth-child(2) { background: #ffbd2e; }
.terminal-top span:nth-child(3) { background: #27c93f; }
.terminal-top strong { margin-left: 6px; color: var(--muted); font: 700 0.8rem JetBrains Mono, monospace; }
pre {
  margin: 0;
  padding: 24px;
  overflow-x: auto;
  color: #b8ffdf;
  font: 0.9rem/1.7 JetBrains Mono, monospace;
}

main { width: min(1160px, calc(100% - 48px)); margin: 0 auto 70px; }
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 10px 0 52px;
}
.stats-strip div {
  padding: 22px;
  background: rgba(255,255,255,0.045);
  border: 1px solid var(--border);
  border-radius: 18px;
  text-align: center;
}
.stats-strip strong { display: block; font-size: 2rem; color: var(--red); }
.stats-strip span { color: var(--muted); font-weight: 800; font-size: 0.82rem; }

.section { margin: 64px 0; }
.section-head { max-width: 760px; margin-bottom: 24px; }
.section h2 {
  font-size: clamp(2rem, 5vw, 4rem);
  letter-spacing: -0.06em;
  margin: 12px 0 12px;
}
.section p { color: var(--muted); line-height: 1.7; }

.course-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.course-card {
  position: relative;
  display: grid;
  grid-template-columns: 76px 1fr;
  gap: 18px;
  min-height: 252px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: linear-gradient(145deg, rgba(17,24,39,0.94), rgba(10,15,24,0.94));
  overflow: hidden;
}
.course-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 90% 0%, rgba(229,57,53,0.10), transparent 28rem);
  pointer-events: none;
}
.course-card.live { border-color: var(--border-hi); }
.course-card.capstone { border-color: rgba(6, 214, 160, 0.38); }
.course-num {
  position: relative;
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  background: var(--red-soft);
  border: 1px solid var(--border-hi);
  color: #ff9a96;
  font: 900 1.3rem JetBrains Mono, monospace;
}
.course-body { position: relative; }
.tag {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.10);
  border: 1px solid var(--border);
  color: var(--muted);
  font: 800 0.7rem JetBrains Mono, monospace;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.live-tag { color: #ffd6d4; background: var(--red-soft); border-color: var(--border-hi); }
h3 { font-size: 1.34rem; letter-spacing: -0.03em; margin: 14px 0 10px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 18px; }
.chips span {
  color: var(--muted);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.76rem;
  font-weight: 800;
}
.course-link { color: var(--teal); font-weight: 900; text-decoration: none; }
.course-link.muted { color: var(--dim); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.panel {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: rgba(255,255,255,0.045);
}
.panel h2 { font-size: clamp(1.7rem, 4vw, 2.8rem); }
.ladder-list { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 14px; }
.ladder-list li {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(0,0,0,0.16);
}
.ladder-list strong { color: var(--red); }
.ladder-list span { color: var(--muted); line-height: 1.55; }
.build-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.build-list span {
  padding: 12px 14px;
  background: rgba(6, 214, 160, 0.10);
  border: 1px solid rgba(6, 214, 160, 0.24);
  border-radius: 14px;
  color: #b9ffe7;
  font-weight: 900;
}
.capstone-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 32px;
  border-radius: 24px;
  border: 1px solid var(--border-hi);
  background: linear-gradient(135deg, rgba(229,57,53,0.14), rgba(6,214,160,0.08));
}
.capstone-band h2 { font-size: clamp(1.8rem, 5vw, 3.5rem); }
.capstone-band p { max-width: 680px; margin-bottom: 0; }
.site-footer { text-align: center; color: var(--dim); padding: 40px 20px 80px; font: 700 0.82rem JetBrains Mono, monospace; }

@media (max-width: 850px) {
  .hero-shell { padding-top: 56px; }
  .hero-grid, .course-grid, .split { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: repeat(2, 1fr); }
  .course-card { grid-template-columns: 1fr; }
  .capstone-band { flex-direction: column; align-items: flex-start; }
  .back-link { left: 14px; bottom: 14px; }
}
@media (max-width: 520px) {
  main { width: min(100% - 28px, 1160px); }
  .stats-strip { grid-template-columns: 1fr; }
  .ladder-list li { grid-template-columns: 1fr; }
  pre { font-size: 0.76rem; }
}