/* /learn pages — shared CSS. Matches vision.html design tokens. */

:root {
  --charcoal: #121110;
  --surface: #1a1817;
  --surface-2: #242120;
  --border: #2E2B29;
  --border-light: #3D3937;
  --warm-gray: #9A8B80;
  --muted: #857A70;
  --coral: #D97757;
  --peach: #E8B4A0;
  --off-white: #F5F0EB;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body.learn-body {
  background: var(--charcoal);
  color: var(--off-white);
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

/* NAV */
.learn-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(18, 17, 16, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.learn-nav-inner {
  max-width: 68.75rem;
  margin: 0 auto;
  padding: 0.875rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.learn-logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.learn-logo img {
  height: 56px;
  width: auto;
  display: block;
  margin: -0.625rem 0;
  transition: opacity 0.2s ease;
}
.learn-logo:hover img { opacity: 0.85; }
.learn-nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--warm-gray);
}
.learn-nav-links a:hover { color: var(--off-white); }
.learn-nav-cta {
  color: var(--off-white) !important;
  font-weight: 400;
  transition: color 0.15s ease;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.25rem;
}
.learn-nav-cta:hover {
  color: #fff !important;
}

/* MAIN container */
.learn-main {
  max-width: 47.5rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
}

/* BREADCRUMB */
.learn-breadcrumb {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}
.learn-breadcrumb a {
  color: var(--warm-gray);
  transition: color 0.15s ease;
}
.learn-breadcrumb a:hover { color: var(--off-white); }
.learn-breadcrumb .sep { color: var(--muted); opacity: 0.5; }

/* HEADER */
.learn-header { margin-bottom: 2rem; }
.learn-h1 {
  font-size: clamp(2rem, 1.5rem + 2.4vw, 2.75rem);
  line-height: 1.1;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.learn-lede {
  font-size: 1.125rem;
  line-height: 1.5;
  color: var(--warm-gray);
  font-weight: 300;
  max-width: 60ch;
}
.learn-meta {
  margin-top: 1.25rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* TL;DR */
.tldr {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem 1.75rem;
  margin: 2.25rem 0;
}
.tldr-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6875rem;
  color: var(--coral);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}
.tldr-lead {
  font-size: 1.0625rem;
  line-height: 1.55;
  margin-bottom: 1rem;
  color: var(--off-white);
}
.tldr-bullets { list-style: none; padding: 0; }
.tldr-bullets li {
  font-family: 'DM Mono', monospace;
  font-size: 0.875rem;
  color: var(--warm-gray);
  padding: 0.375rem 0;
  border-top: 1px solid var(--border);
}
.tldr-bullets li:first-child { border-top: none; padding-top: 0; }

/* VISUALIZER */
.viz-frame {
  margin: 2.25rem 0 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  overflow: hidden;
}
.viz-img { width: 100%; height: auto; display: block; max-height: 20rem; object-fit: contain; }

/* CTA */
.learn-cta-row {
  display: flex;
  justify-content: center;
  margin: 0 0 3rem;
}
.learn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.875rem 1.5rem;
  background: var(--coral);
  color: var(--charcoal);
  border-radius: 10px;
  font-weight: 500;
  font-size: 0.9375rem;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}
.learn-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 32px -8px rgba(217, 119, 87, 0.6);
}
.learn-cta-arrow { transition: transform 0.2s ease; }
.learn-cta:hover .learn-cta-arrow { transform: translateX(3px); }

/* WALKTHROUGH */
.walkthrough { margin: 1rem 0 3.5rem; }
.walkthrough h2 {
  font-size: clamp(1.375rem, 1.125rem + 1.2vw, 1.625rem);
  font-weight: 500;
  margin: 2.25rem 0 0.875rem;
  letter-spacing: -0.01em;
}
.walkthrough p {
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--off-white);
  margin-bottom: 1.25rem;
}

/* INLINE CTA */
.inline-cta {
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.inline-cta-text { color: var(--warm-gray); font-size: 0.9375rem; }
.inline-cta a {
  color: var(--coral);
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.inline-cta a:hover { color: var(--peach); }

/* FAQ */
.learn-faq { margin: 3.5rem 0; }
.learn-section-title {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--coral);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}
.faq-item {
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
}
.faq-item:last-child { border-bottom: 1px solid var(--border); }
.faq-q {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 0.625rem;
  color: var(--off-white);
}
.faq-a {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--warm-gray);
}

/* RELATED */
.related { margin: 3.5rem 0; }
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}
.related-card {
  display: block;
  padding: 1.125rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.related-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}
.related-cat {
  font-family: 'DM Mono', monospace;
  font-size: 0.6875rem;
  color: var(--coral);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.375rem;
}
.related-title {
  font-size: 0.9375rem;
  color: var(--off-white);
  line-height: 1.4;
}

/* FINAL CTA */
.final-cta {
  margin-top: 4rem;
  padding: 2.5rem 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  text-align: center;
}
.final-cta h3 {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 0.625rem;
  letter-spacing: -0.01em;
}
.final-cta p {
  color: var(--warm-gray);
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

/* CATEGORY HUB */
.category-hero { margin-bottom: 3rem; }
.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.topic-card {
  display: block;
  padding: 1.375rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.topic-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}
.topic-card-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--off-white);
  margin-bottom: 0.25rem;
}
.topic-card-desc {
  font-size: 0.8125rem;
  color: var(--warm-gray);
}

/* MASTER HUB */
.master-hero { margin-bottom: 3rem; }

.pill-section { margin-bottom: 3.5rem; }
.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.pill {
  display: inline-block;
  padding: 0.5625rem 1rem;
  border: 1px solid var(--border-light);
  border-radius: 999px;
  font-size: 0.875rem;
  color: var(--off-white);
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.pill:hover {
  border-color: var(--coral);
  background: var(--coral);
  color: var(--charcoal);
}

.guides-section { margin-bottom: 3rem; }
.guides-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.guide-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1.25rem;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.15s ease, transform 0.15s ease;
  align-items: center;
}
.guide-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}
.guide-thumb {
  width: 200px;
  aspect-ratio: 8 / 3;
  border-radius: 8px;
  overflow: hidden;
  background: var(--bgDeep, #161412);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.guide-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.guide-thumb svg {
  width: 100%;
  height: 100%;
  display: block;
}
.guide-body { min-width: 0; }
.guide-cat {
  font-family: 'DM Mono', monospace;
  font-size: 0.6875rem;
  color: var(--coral);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.375rem;
}
.guide-title {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--off-white);
  margin-bottom: 0.375rem;
  letter-spacing: -0.01em;
}
.guide-lead {
  font-size: 0.875rem;
  color: var(--warm-gray);
  line-height: 1.5;
  margin-bottom: 0.5rem;
}
.guide-date {
  font-family: 'DM Mono', monospace;
  font-size: 0.6875rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* FOOTER */
.learn-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  margin-top: 4rem;
}
.learn-footer-inner {
  max-width: 68.75rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1.5rem;
}
.learn-footer-logo {
  justify-self: start;
  display: inline-flex;
  align-items: center;
}
.learn-footer-logo img {
  height: 56px;
  width: auto;
  display: block;
  margin: -0.625rem 0;
}
.learn-footer-links {
  display: flex;
  gap: 1.25rem;
  justify-content: center;
  font-size: 0.8125rem;
  color: var(--warm-gray);
}
.learn-footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.125rem;
}
.learn-footer-links a:hover { color: var(--off-white); }
.learn-footer-note {
  font-family: 'DM Mono', monospace;
  font-size: 0.6875rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* MOBILE */
@media (max-width: 720px) {
  .learn-main { padding: 2rem 1.25rem 4rem; }
  .learn-h1 { font-size: 2rem; }
  .learn-lede { font-size: 1rem; }
  .tldr { padding: 1.25rem; }
  .tldr-lead { font-size: 0.9375rem; }
  .walkthrough h2 { font-size: 1.375rem; margin: 1.75rem 0 0.75rem; }
  .walkthrough p { font-size: 1rem; }
  .related-grid, .topic-grid {
    grid-template-columns: 1fr;
  }
  .guide-card {
    grid-template-columns: 1fr;
    gap: 0.875rem;
  }
  .guide-thumb {
    width: 100%;
    aspect-ratio: 8 / 3;
    height: auto;
  }
  .guide-title { font-size: 1rem; }
  .pill { font-size: 0.8125rem; padding: 0.5rem 0.875rem; }
  .inline-cta { flex-direction: column; align-items: flex-start; }
  .final-cta { padding: 2rem 1.25rem; }
  .final-cta h3 { font-size: 1.25rem; }
  .learn-footer-inner {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }
  .learn-nav-links { gap: 1rem; font-size: 0.8125rem; }
  .learn-nav-cta { padding: 0 0.5rem; }
}