/* ==========================================================================
   OgbonMath — User Guide page
   --------------------------------------------------------------------------
   Comprehensive feature map. Hero + grouped feature-card sections + a
   power-user shortcuts block. Same design language as the home page and
   textbook About panels: WELCOME-style eyebrow, display-font tagline,
   single OgbonMath orange accent throughout, no per-feature gradients.
   ========================================================================== */

.guide {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 40px 64px;
  display: flex;
  flex-direction: column;
  gap: 64px;
  font-family: var(--font-sans);
}

@media (max-width: 768px) {
  .guide {
    padding: 32px 20px 48px;
    gap: 48px;
  }
}

/* ==========================================================================
   Hero — editorial flagship for the guide
   ========================================================================== */
.guide-hero {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: 760px;
}

.guide-hero-eyebrow {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: var(--fw-bold, 700);
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--ac);
  margin-bottom: 18px;
}

.guide-hero-tagline {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.018em;
  line-height: 1.18;
  color: var(--tx);
  margin: 0 0 22px;
  max-width: 24ch;
}

.guide-hero-body {
  font-size: 16px;
  line-height: 1.65;
  color: var(--tx2);
  margin: 0;
  max-width: 60ch;
}

@media (max-width: 768px) {
  .guide-hero-tagline { font-size: clamp(22px, 5.4vw, 26px); }
}

/* ==========================================================================
   Section header (Learn / Practice / Explore / Organize / Power user)
   ========================================================================== */
.guide-section {
  display: flex;
  flex-direction: column;
}

.guide-section-header {
  margin-bottom: 28px;
}

.guide-section-eyebrow {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: var(--fw-bold, 700);
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--tx3);
}

.guide-section-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: var(--fw-semibold);
  letter-spacing: -0.012em;
  color: var(--tx);
  margin: 6px 0 0;
  line-height: 1.25;
}

@media (max-width: 768px) {
  .guide-section-header { margin-bottom: 20px; }
  .guide-section-title { font-size: 20px; }
}

/* ==========================================================================
   Feature card grid
   ========================================================================== */
.guide-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.guide-feature-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 24px 26px 22px;
  background: var(--bg2);
  border: 1px solid var(--bdr);
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: var(--tx);
  transition: transform var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}

.guide-feature-card:hover {
  transform: translateY(-2px);
  border-color: var(--ac);
  box-shadow: var(--shadow-lg);
}

.guide-feature-card:focus-visible {
  outline: 3px solid var(--ac-ring);
  outline-offset: 2px;
}

.guide-feature-glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--bg3);
  border-radius: var(--radius-md);
  color: var(--ac);
  font-size: 22px;
  font-weight: var(--fw-semibold);
  line-height: 1;
  transition: background var(--dur-fast) var(--ease-out);
}

.guide-feature-card:hover .guide-feature-glyph {
  background: var(--ac-soft);
}

.guide-feature-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.guide-feature-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: var(--fw-semibold);
  letter-spacing: -0.01em;
  color: var(--tx);
  margin: 0;
  line-height: 1.25;
}

.guide-feature-desc {
  font-size: 14px;
  line-height: 1.55;
  color: var(--tx2);
  margin: 0;
}

.guide-feature-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 4px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: var(--fw-bold, 700);
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--ac);
  transition: gap var(--dur-fast) var(--ease-out);
}

.guide-feature-card:hover .guide-feature-cta {
  gap: 10px;
}

/* ==========================================================================
   Power-user shortcuts list
   ========================================================================== */
.guide-shortcuts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px 28px;
  padding: 28px 32px;
  background: var(--bg2);
  border: 1px solid var(--bdr);
  border-left: 4px solid var(--ac);
  border-radius: var(--radius-lg);
}

.guide-shortcut {
  display: flex;
  align-items: center;
  gap: 16px;
}

.guide-shortcut-keys {
  font-family: var(--font-mono, monospace);
  font-size: 12px;
  font-weight: var(--fw-semibold, 600);
  color: var(--tx);
  background: var(--bg3);
  border: 1px solid var(--bdr);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 5px 10px;
  min-width: 72px;
  text-align: center;
  letter-spacing: 0.4px;
  flex-shrink: 0;
}

.guide-shortcut-action {
  font-size: 14px;
  color: var(--tx2);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .guide-shortcuts {
    padding: 22px 20px;
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .guide-shortcut-keys {
    min-width: 64px;
    font-size: 11px;
  }
}