:root {
  color-scheme: dark;
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1f242d;
  --text: #f6f2e8;
  --muted: #aeb6c2;
  --line: #333946;
  --accent: #9ee493;
  --warn: #f8c14a;
  --hot: #ff7a59;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 70% 5%, rgba(158, 228, 147, .12), transparent 28rem),
    radial-gradient(circle at 15% 35%, rgba(248, 193, 74, .08), transparent 30rem),
    var(--bg);
  color: var(--text);
}

.build-strip {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: center;
  gap: 1rem;
  border-bottom: 1px solid rgba(158, 228, 147, .28);
  background: rgba(11, 13, 17, .92);
  color: var(--muted);
  padding: .55rem 1rem;
  font-size: .9rem;
  backdrop-filter: blur(12px);
}

.build-strip strong {
  color: var(--text);
}

.pulse {
  width: .65rem;
  height: .65rem;
  margin-top: .28rem;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(158, 228, 147, .72);
  animation: heartbeat 1.8s infinite;
}

@keyframes heartbeat {
  0% { box-shadow: 0 0 0 0 rgba(158, 228, 147, .72); }
  70% { box-shadow: 0 0 0 .55rem rgba(158, 228, 147, 0); }
  100% { box-shadow: 0 0 0 0 rgba(158, 228, 147, 0); }
}

a {
  color: inherit;
}

code,
pre,
.brand {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.site-header,
.site-footer {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  font-weight: 800;
  text-decoration: none;
}

.prompt,
.eyebrow {
  color: var(--accent);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--muted);
  font-size: .95rem;
}

nav a {
  text-decoration: none;
}

.hero,
.section,
.lesson-page {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  min-height: 62vh;
  display: grid;
  align-content: center;
  padding: 5rem 0 3rem;
}

.compact-hero {
  min-height: 42vh;
}

.eyebrow {
  margin: 0 0 .75rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 800;
  font-size: .78rem;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 10ch;
  margin-bottom: 1.2rem;
  font-size: clamp(3.6rem, 10vw, 8rem);
  line-height: .88;
  letter-spacing: 0;
}

h2 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1;
  letter-spacing: 0;
}

h3 {
  font-size: 1.18rem;
  line-height: 1.2;
}

.lede,
p,
li {
  color: var(--muted);
  line-height: 1.65;
}

.lede {
  max-width: 68ch;
  font-size: 1.18rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.25rem;
}

.status-panel {
  max-width: 42rem;
  margin-top: 1.25rem;
  border-left: .28rem solid var(--accent);
  background: rgba(23, 26, 33, .72);
  padding: 1rem;
}

.status-panel p:last-child {
  margin-bottom: 0;
}

.small-note {
  font-size: .9rem;
}

.button,
.copy-button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #0a0d0a;
  border-radius: .35rem;
  padding: .72rem 1rem;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.button.ghost {
  background: transparent;
  color: var(--accent);
}

.section {
  padding: 4rem 0;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.lesson-card,
.promo-card,
.series-list article,
.experiment,
.command-panel {
  border: 1px solid var(--line);
  border-radius: .5rem;
  background: rgba(23, 26, 33, .82);
}

.lesson-card {
  display: grid;
  gap: .85rem;
  align-content: start;
  min-height: 22rem;
  padding: 1rem;
}

.lesson-card a {
  text-decoration-color: var(--accent);
  text-underline-offset: .2rem;
}

.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  color: var(--muted);
  font-size: .84rem;
}

.danger {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: .16rem .52rem;
  color: #101114;
  background: var(--accent);
  font-size: .78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.danger.caution {
  background: var(--warn);
}

.danger.danger {
  background: var(--hot);
}

.lesson-card code,
.terminal-steps code {
  display: block;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: .35rem;
  background: #0b0d11;
  color: var(--text);
  padding: .8rem;
  white-space: pre;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, .9fr);
  gap: 2rem;
  align-items: start;
}

.series-list {
  display: grid;
  gap: .8rem;
}

.series-list article,
.promo-card,
.experiment {
  padding: 1rem;
}

.demo-links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1rem;
}

.demo-links a {
  border: 1px solid var(--line);
  border-radius: .35rem;
  background: var(--panel);
  color: var(--accent);
  padding: .55rem .75rem;
  text-decoration: none;
  font-weight: 800;
}

.terminal-window {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: .5rem;
  background: #080a0d;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .28);
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: .42rem;
  border-bottom: 1px solid var(--line);
  background: #11151c;
  padding: .65rem .8rem;
}

.terminal-bar span {
  width: .68rem;
  height: .68rem;
  border-radius: 999px;
  background: var(--line);
}

.terminal-bar span:nth-child(1) {
  background: #ff6b6b;
}

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

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

.terminal-bar strong {
  margin-left: .4rem;
  color: var(--muted);
  font-size: .85rem;
}

.terminal-window pre {
  max-height: 32rem;
  overflow: auto;
  padding: 1rem;
  color: #d7f7d0;
  font-size: .92rem;
  line-height: 1.5;
}

.workflow ol,
.terminal-steps,
.queue-list {
  padding-left: 1.25rem;
}

.queue-list {
  margin: 0;
  border-left: 1px solid var(--line);
}

.queue-list li {
  margin-bottom: .75rem;
  padding-left: .4rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0;
}

.lesson-page {
  padding: 3rem 0 4rem;
}

.lesson-page h1 {
  max-width: 12ch;
}

.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--accent);
}

.command-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: end;
  margin: 2rem 0;
  padding: 1rem;
}

.label {
  margin-bottom: .35rem;
  color: var(--accent);
  font-weight: 800;
}

pre {
  margin: 0;
  overflow-x: auto;
}

pre code {
  color: var(--text);
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.details-grid div {
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

.details-grid h2 {
  font-size: 1.15rem;
}

@media (max-width: 800px) {
  .site-header,
  .section-heading,
  .command-panel {
    align-items: start;
    flex-direction: column;
  }

  .lesson-grid,
  .split,
  .details-grid,
  .command-panel {
    grid-template-columns: 1fr;
  }

  .build-strip {
    align-items: start;
    flex-direction: column;
    gap: .25rem;
  }

  h1 {
    font-size: clamp(3rem, 18vw, 5rem);
  }
}