/* ============================================================
   HOMEPAGE · CURRICULUM — simplified, accessible, brand-consistent
   Fixes the hard color break between #features → #curriculum,
   tones down the constellation background, tightens accordion
   hierarchy, improves keyboard + screen-reader affordances.
   ============================================================ */

/* Soft seam instead of abrupt bg-surface jump */
#curriculum {
  /* Override inline `background: var(--bg-surface)` with a subtle gradient */
  background:
    radial-gradient(60% 45% at 50% 0%, rgba(232,160,32,0.06), transparent 70%),
    linear-gradient(180deg,
      rgba(13, 13, 20, 0) 0%,
      rgba(13, 13, 20, 0.70) 12%,
      rgba(13, 13, 20, 0.78) 40%,
      rgba(13, 13, 20, 0.78) 100%
    ) !important;
  padding-block: clamp(4rem, 2rem + 6vw, 7.5rem);
  position: relative;
}

/* Top glow seam echoes features → curriculum transition */
#curriculum::before {
  content: '';
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(232,160,32,0.55) 30%,
    rgba(236,72,153,0.55) 50%,
    rgba(46,222,201,0.55) 70%,
    transparent 100%);
  filter: blur(0.5px);
  opacity: 0.6;
  pointer-events: none;
}

/* Constellation — push way back so it's atmosphere, not feature */
#curriculum .constellation-wrap {
  opacity: 0.16;
  filter: blur(0.5px) saturate(0.8);
  mask-image: radial-gradient(ellipse at 50% 40%,
    #000 30%, rgba(0,0,0,0.35) 65%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%,
    #000 30%, rgba(0,0,0,0.35) 65%, transparent 85%);
}

#curriculum .section-watermark {
  opacity: 0.05;
  letter-spacing: 0.04em;
}

/* Header tightened */
#curriculum .section-header {
  margin-block-end: clamp(1.5rem, 1rem + 2vw, 2.75rem);
}

#curriculum .section-title {
  font-size: clamp(2rem, 1.4rem + 2.6vw, 3.2rem);
  margin-block-end: 0.5rem;
}

#curriculum .section-subtitle {
  max-width: 560px;
  margin-inline: auto;
  color: rgba(240,240,255,0.72);
  font-size: 1rem;
  line-height: 1.65;
}

/* ── Accordion list: cleaner rhythm, larger tap targets ── */
#curriculum .curriculum-list {
  max-width: 860px;
  margin-inline: auto;
  display: grid;
  gap: 0.65rem;
}

#curriculum [data-item] {
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 14px;
  background: rgba(19, 19, 30, 0.06);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition:
    border-color 240ms var(--ease-out, ease),
    background    240ms var(--ease-out, ease),
    transform     240ms var(--ease-out, ease);
}

#curriculum [data-item]:hover {
  border-color: rgba(232,160,32,0.25);
  background: rgba(24, 24, 37, 0.75);
}

#curriculum [data-item].open {
  border-color: rgba(232,160,32,0.45);
  background: linear-gradient(180deg, rgba(29,22,12,0.9), rgba(19,19,30,0.85));
  box-shadow: 0 14px 40px rgba(0,0,0,0.45), inset 0 0 0 1px rgba(232,160,32,0.18);
}

#curriculum [data-toggle],
#curriculum .curriculum-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  user-select: none;
  min-height: 64px;
  outline-offset: 4px;
}

#curriculum [data-toggle]:focus-visible,
#curriculum .curriculum-header:focus-visible {
  outline: 2px solid var(--gold-400, #fbbf24);
  border-radius: 14px;
}

#curriculum .curriculum-header-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex: 1;
  min-width: 0;
}

#curriculum .curriculum-cat-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

#curriculum .curriculum-cat-name {
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--text-1, #f0f0ff);
  line-height: 1.25;
}

#curriculum .curriculum-cat-meta {
  font-size: 0.78rem;
  color: rgba(240,240,255,0.55);
  margin-top: 2px;
  line-height: 1.4;
}

#curriculum .curriculum-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.3rem 0.7rem;
  border-radius: 99px;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

#curriculum .curriculum-chevron {
  width: 1.5rem;
  height: 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  color: rgba(240,240,255,0.55);
  background: rgba(255,255,255,0.04);
  border-radius: 99px;
  transition: transform 300ms var(--ease-out), color 200ms;
}

#curriculum [data-item].open .curriculum-chevron {
  transform: rotate(180deg);
  color: var(--gold-400, #fbbf24);
  background: rgba(232,160,32,0.15);
}

/* ── Body: smoother reveal, scannable ── */
#curriculum .curriculum-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 380ms var(--ease-out, cubic-bezier(.23,1,.32,1));
}

#curriculum [data-item].open .curriculum-body {
  grid-template-rows: 1fr;
}

#curriculum .curriculum-body > * {
  overflow: hidden;
}

#curriculum .curriculum-lessons {
  padding: 0.25rem 1.25rem 1.1rem;
  display: grid;
  gap: 0.35rem;
}

#curriculum .curriculum-lesson {
  display: grid;
  grid-template-columns: 2.2rem 1fr auto;
  align-items: center;
  gap: 0.85rem;
  padding: 0.55rem 0.7rem;
  border-radius: 10px;
  background: rgba(255,255,255,0.02);
  font-size: 0.92rem;
  transition: background 160ms;
}

#curriculum .curriculum-lesson:hover {
  background: rgba(255,255,255,0.05);
}

#curriculum .curriculum-lesson-num {
  font-family: 'Space Grotesk', 'JetBrains Mono', monospace;
  color: rgba(232,160,32,0.7);
  font-weight: 700;
  font-size: 0.78rem;
}

#curriculum .curriculum-lesson-name {
  color: rgba(240,240,255,0.88);
  line-height: 1.35;
}

#curriculum .curriculum-lesson-duration {
  color: rgba(240,240,255,0.48);
  font-size: 0.78rem;
  white-space: nowrap;
}

#curriculum .curriculum-locked {
  margin-top: 0.4rem;
  padding: 0.7rem 0.9rem;
  border-radius: 10px;
  background: rgba(232,160,32,0.07);
  border: 1px dashed rgba(232,160,32,0.28);
  color: rgba(240,240,255,0.62);
  font-size: 0.82rem;
  text-align: center;
}

/* ── Progressive disclosure: collapse heavy list on first view ── */
#curriculum .curriculum-list[data-collapsed="true"] > [data-item]:nth-child(n+6) {
  display: none;
}

#curriculum .curriculum-showmore {
  display: block;
  margin: 1.25rem auto 0;
  padding: 0.75rem 1.75rem;
  background: linear-gradient(135deg, rgba(232,160,32,0.18), rgba(236,72,153,0.18));
  border: 1px solid rgba(232,160,32,0.4);
  border-radius: 99px;
  color: var(--gold-300, #fcd34d);
  font-weight: 700;
  font-size: 0.92rem;
  cursor: pointer;
  transition: transform 200ms, background 200ms, box-shadow 200ms;
}

#curriculum .curriculum-showmore:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, rgba(232,160,32,0.28), rgba(236,72,153,0.28));
  box-shadow: 0 8px 24px rgba(232,160,32,0.25);
}

#curriculum .curriculum-showmore[aria-expanded="true"]::after {
  content: ' ▲';
}
#curriculum .curriculum-showmore[aria-expanded="false"]::after {
  content: ' ▼';
}

/* ── Mobile: gold left border on first curriculum category ── */
@media (max-width: 640px) {
  #curriculum .curriculum-cat:first-child {
    border-left: 2px solid #E8A020;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  #curriculum [data-item],
  #curriculum .curriculum-chevron,
  #curriculum .curriculum-body {
    transition: none !important;
  }
}


/* ============================================================
   CINEMATIC HEADER UPGRADE — neural network background
   ============================================================ */
#curriculum > .container > .section-header {
  position: relative;
  isolation: isolate;
}

#curriculum > .container > .section-header::before {
  content: "";
  position: absolute;
  inset: -40px -10% -20px;
  z-index: -1;
  pointer-events: none;
  opacity: 0.55;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 800 320%22><defs><radialGradient id=%22g%22 cx=%2250%25%22 cy=%2250%25%22><stop offset=%220%25%22 stop-color=%22%23e8a020%22 stop-opacity=%220.5%22/><stop offset=%22100%25%22 stop-color=%22%2322d3ee%22 stop-opacity=%220%22/></radialGradient></defs><g stroke=%22%23e8a020%22 stroke-opacity=%220.18%22 stroke-width=%221%22 fill=%22none%22><path d=%22M40 80 L200 60 L380 120 L560 70 L740 100%22/><path d=%22M40 200 L180 220 L360 180 L540 230 L740 200%22/><path d=%22M120 40 L160 160 L300 220%22/><path d=%22M500 40 L520 160 L660 220%22/></g><g fill=%22%23e8a020%22><circle cx=%2240%22 cy=%2280%22 r=%223%22/><circle cx=%22200%22 cy=%2260%22 r=%224%22/><circle cx=%22380%22 cy=%22120%22 r=%225%22 fill=%22%2322d3ee%22/><circle cx=%22560%22 cy=%2270%22 r=%224%22/><circle cx=%22740%22 cy=%22100%22 r=%223%22/><circle cx=%22180%22 cy=%22220%22 r=%223%22/><circle cx=%22360%22 cy=%22180%22 r=%224%22 fill=%22%2322d3ee%22/><circle cx=%22540%22 cy=%22230%22 r=%223%22/></g><circle cx=%22400%22 cy=%22160%22 r=%22220%22 fill=%22url(%23g)%22/></svg>");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 100% 100%;
  filter: blur(0.4px);
  will-change: transform;
}

@media (prefers-reduced-motion: no-preference) {
  #curriculum > .container > .section-header .section-title {
    animation: curr-glow-pulse 4s ease-in-out infinite;
  }
}

@keyframes curr-glow-pulse {
  0%, 100% {
    text-shadow:
      0 0 18px rgba(232, 160, 32, 0.20),
      0 0 40px rgba(34, 211, 238, 0.10);
  }
  50% {
    text-shadow:
      0 0 28px rgba(232, 160, 32, 0.45),
      0 0 60px rgba(34, 211, 238, 0.25);
  }
}

/* Typewriter intro on subtitle (one-time, JS adds .typewriting) */
#curriculum > .container > .section-header .section-subtitle.typewriting {
  display: inline-block;
  overflow: hidden;
  white-space: nowrap;
  border-inline-end: 2px solid var(--gold, #e8a020);
  animation: curr-typewriter 2.6s steps(60, end) 0.2s 1 both,
             curr-caret 0.8s step-end infinite;
}

@keyframes curr-typewriter {
  from { max-width: 0; }
  to   { max-width: 100%; }
}
@keyframes curr-caret {
  50% { border-color: transparent; }
}

@media (prefers-reduced-motion: reduce) {
  #curriculum > .container > .section-header::before { display: none; }
  #curriculum > .container > .section-header .section-title { animation: none !important; }
  #curriculum > .container > .section-header .section-subtitle.typewriting {
    animation: none !important;
    max-width: 100% !important;
    border-inline-end: 0;
    white-space: normal;
  }
}