:root {
  --learn-bg: #060f1c;
  --learn-bg-deep: #030a13;
  --learn-surface: rgba(13, 29, 52, 0.82);
  --learn-surface-strong: rgba(9, 20, 36, 0.94);
  --learn-line: rgba(137, 181, 224, 0.27);
  --learn-line-strong: rgba(28, 202, 216, 0.55);
  --learn-text: #edf6ff;
  --learn-muted: #afc3d9;
  --learn-cyan: #36d9e5;
  --learn-cyan-soft: #a9f7ff;
  --learn-amber: #f6aa22;
  --learn-amber-dark: #261702;
  --learn-success: #6ee7a8;
  --learn-danger: #ff9ba8;
  --learn-radius: 18px;
  --learn-shadow: 0 24px 70px rgba(0, 5, 13, 0.46);
  --learn-font: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --learn-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.learning-page {
  margin: 0;
  min-width: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--learn-text);
  background:
    linear-gradient(rgba(54, 217, 229, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(54, 217, 229, 0.025) 1px, transparent 1px),
    radial-gradient(900px 440px at 8% -5%, rgba(28, 202, 216, 0.17), transparent 65%),
    radial-gradient(820px 390px at 94% 8%, rgba(246, 170, 34, 0.12), transparent 64%),
    linear-gradient(160deg, var(--learn-bg-deep), var(--learn-bg) 50%, #0b2038);
  background-size: 44px 44px, 44px 44px, auto, auto, auto;
  font-family: var(--learn-font);
  line-height: 1.65;
}

.learning-page a { color: var(--learn-cyan-soft); }
.learning-page a:hover { color: #fff; }

.skip-link {
  position: fixed;
  z-index: 20000;
  top: 0.75rem;
  left: 0.75rem;
  transform: translateY(-180%);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  background: var(--learn-amber);
  color: var(--learn-amber-dark) !important;
  font-weight: 800;
  text-decoration: none;
}

.skip-link:focus { transform: translateY(0); }

.learning-page :focus-visible {
  outline: 3px solid var(--learn-amber);
  outline-offset: 4px;
}

.learning-shell {
  width: min(1140px, calc(100% - 2rem));
  margin-inline: auto;
}

.learning-header { border-bottom: 1px solid var(--learn-line); }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  padding-block: 1rem;
  color: var(--learn-muted);
  font-family: var(--learn-mono);
  font-size: 0.78rem;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  content: '/';
  margin-left: 0.45rem;
  color: #718ba7;
}

.breadcrumbs a { text-underline-offset: 3px; }

.learning-main { padding: 2.8rem 0 5rem; }

.learning-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(280px, 0.72fr);
  gap: clamp(1rem, 2.5vw, 2rem);
  align-items: stretch;
}

.learning-hero-copy,
.signal-console,
.learning-panel,
.mistake-panel,
.next-panel,
.faq-panel {
  border: 1px solid var(--learn-line);
  border-radius: var(--learn-radius);
  background: linear-gradient(155deg, rgba(18, 39, 67, 0.86), var(--learn-surface-strong));
  box-shadow: var(--learn-shadow);
}

.learning-hero-copy { padding: clamp(1.35rem, 4vw, 3rem); }

.eyebrow,
.panel-kicker,
.console-label,
.step-number,
.access-note {
  font-family: var(--learn-mono);
  text-transform: uppercase;
  letter-spacing: 0.085em;
}

.eyebrow {
  margin: 0;
  color: var(--learn-cyan);
  font-size: 0.78rem;
  font-weight: 700;
}

.learning-hero h1 {
  max-width: 18ch;
  margin: 0.7rem 0 1rem;
  font-size: clamp(2.25rem, 6vw, 4.65rem);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.hero-deck {
  max-width: 63ch;
  margin: 0;
  color: #d3e4f6;
  font-size: clamp(1.02rem, 1.5vw, 1.18rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.75rem 1.05rem;
  border: 1px solid transparent;
  border-radius: 10px;
  font-weight: 800;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--learn-amber); color: var(--learn-amber-dark) !important; }
.button-primary:hover { background: #ffc04f; color: #160d00 !important; }
.button-secondary { border-color: var(--learn-line-strong); background: rgba(8, 35, 48, 0.55); color: var(--learn-cyan-soft) !important; }
.button-secondary:hover { border-color: var(--learn-cyan); background: rgba(13, 65, 78, 0.62); }

.access-note {
  margin: 0.65rem 0 0;
  color: var(--learn-muted);
  font-size: 0.69rem;
}

.signal-console {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(1.2rem, 3vw, 2rem);
  overflow: hidden;
}

.signal-console::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, transparent 0 5px, rgba(255,255,255,0.018) 5px 6px);
}

.console-label { color: var(--learn-muted); font-size: 0.7rem; }
.console-readout { position: relative; }

.signal-path {
  display: grid;
  gap: 0;
  margin: 1.3rem 0 0;
  padding: 0;
  list-style: none;
}

.signal-path li {
  position: relative;
  min-width: 0;
  padding: 0.85rem 0.8rem 0.85rem 2.2rem;
  border-left: 2px solid rgba(54, 217, 229, 0.42);
  color: #dcecff;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.signal-path li::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 1.25rem;
  width: 10px;
  height: 10px;
  border: 2px solid var(--learn-bg);
  border-radius: 50%;
  background: var(--learn-cyan);
  box-shadow: 0 0 18px rgba(54, 217, 229, 0.78);
}

.signal-path li:last-child { border-left-color: transparent; color: #ffe0a2; }
.console-code { margin: 1.4rem 0 0; color: var(--learn-cyan); font-family: var(--learn-mono); font-size: 0.82rem; letter-spacing: 0.12em; }

.learning-section { padding-top: clamp(3.2rem, 7vw, 5.5rem); }
.section-heading { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); gap: 1rem 2rem; align-items: end; margin-bottom: 1.35rem; }
.panel-kicker { margin: 0 0 0.4rem; color: var(--learn-cyan); font-size: 0.72rem; }
.section-heading h2 { margin: 0; font-size: clamp(1.8rem, 3.5vw, 3rem); line-height: 1.05; letter-spacing: -0.03em; }
.section-heading p { max-width: 62ch; margin: 0; color: var(--learn-muted); }

.progression {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--learn-line);
  border-radius: var(--learn-radius);
  background: var(--learn-line);
  box-shadow: var(--learn-shadow);
}

.progression.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.progression.five { grid-template-columns: repeat(5, minmax(0, 1fr)); }

.step { min-width: 0; padding: 1.35rem; background: linear-gradient(165deg, #102744, #091625); }
.step-number { display: block; margin-bottom: 1rem; color: var(--learn-cyan); font-size: 0.7rem; }
.step h3 { margin: 0 0 0.5rem; font-size: 1.08rem; line-height: 1.25; }
.step p { margin: 0; color: var(--learn-muted); font-size: 0.92rem; }

.two-column { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr); gap: 1rem; }
.learning-panel,
.mistake-panel,
.next-panel,
.faq-panel { padding: clamp(1.25rem, 3vw, 2rem); }
.learning-panel h2,
.mistake-panel h2,
.next-panel h2,
.faq-panel h2 { margin: 0 0 0.7rem; font-size: clamp(1.55rem, 3vw, 2.25rem); line-height: 1.12; }
.learning-panel p,
.mistake-panel p,
.next-panel p { color: var(--learn-muted); }
.check-list { display: grid; gap: 0.75rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.check-list li { position: relative; padding-left: 1.5rem; color: #d9e8f7; }
.check-list li::before { content: '›'; position: absolute; left: 0; color: var(--learn-cyan); font-family: var(--learn-mono); font-weight: 800; }

.mistake-panel { border-color: rgba(255, 155, 168, 0.34); background: linear-gradient(150deg, rgba(65, 24, 37, 0.56), rgba(11, 19, 31, 0.95)); }
.mistake-panel .panel-kicker { color: var(--learn-danger); }

.related-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; margin-top: 1rem; }
.related-link { min-width: 0; padding: 0.9rem 1rem; border: 1px solid var(--learn-line); border-radius: 10px; background: rgba(3, 13, 23, 0.45); text-decoration: none; font-weight: 700; overflow-wrap: anywhere; }
.related-link span { display: block; margin-top: 0.15rem; color: var(--learn-muted); font-size: 0.78rem; font-weight: 400; }

.faq-list { display: grid; gap: 0.75rem; }
.faq-list details { border-top: 1px solid var(--learn-line); padding-top: 0.75rem; }
.faq-list details:first-child { border-top: 0; padding-top: 0; }
.faq-list summary { min-height: 44px; cursor: pointer; color: var(--learn-text); font-size: 1.02rem; font-weight: 750; }
.faq-list details p { max-width: 78ch; margin: 0.65rem 0 0; color: var(--learn-muted); }

.learning-footer { border-top: 1px solid var(--learn-line); background: rgba(2, 8, 15, 0.7); }
.learning-footer .learning-shell { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.75rem 1.5rem; padding-block: 1.25rem; }
.learning-footer p { margin: 0; color: var(--learn-muted); font-size: 0.85rem; }
.learning-footer nav { display: flex; flex-wrap: wrap; gap: 0.9rem; font-size: 0.85rem; }

@media (max-width: 900px) {
  .learning-hero,
  .section-heading,
  .two-column { grid-template-columns: 1fr; }
  .progression,
  .progression.five { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .learning-shell { width: min(100% - 1.1rem, 1140px); }
  .learning-main { padding-top: 1.35rem; }
  .learning-hero h1 { font-size: clamp(2.1rem, 13vw, 3rem); }
  .progression,
  .progression.three,
  .progression.five,
  .related-links { grid-template-columns: 1fr; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .signal-path li { padding-left: 1.4rem; }
  .step { padding: 1.15rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}