/* =============================================================================
   LIBNEXT — THE LEARNING UNIVERSE
   Design system + page styles
   -----------------------------------------------------------------------------
   Canvas    warm ivory, editorial, generous whitespace
   Accent    six Learning Worlds, one hue each, low saturation, never a rainbow
   Motion    purposeful only; fully disabled under prefers-reduced-motion
   ========================================================================== */

/* ---------------------------------------------------------------- 1. TOKENS */
:root {
  /* surfaces */
  --canvas:        #FBF8F3;
  --canvas-2:      #F4EFE6;
  --canvas-3:      #EDE6D9;
  --surface:       #FFFFFF;
  --night:         #0A0D16;
  --night-2:       #121729;

  /* ink */
  --ink:           #15171D;
  --ink-2:         #4A4E58;
  --ink-3:         #7C7A74;
  --ink-inv:       #F6F3EC;
  --ink-inv-2:     rgba(246,243,236,.62);

  /* lines */
  --line:          rgba(21,23,29,.10);
  --line-2:        rgba(21,23,29,.16);
  --line-inv:      rgba(246,243,236,.16);

  /* learning-world accents */
  --c-academics:   #2A47C8;
  --c-science:     #6E33DC;
  --c-world:       #0A8B80;
  --c-reading:     #B26A12;
  --c-ai:          #C81E6E;
  --c-languages:   #DB4F30;

  --accent:        var(--c-academics);   /* set per-section via [data-world] */

  /* type */
  --sans: 'Plus Jakarta Sans', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --serif: 'Instrument Serif', ui-serif, Georgia, 'Times New Roman', serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-mega:    clamp(3.4rem, 15vw, 11rem);
  --fs-hero:    clamp(2.2rem, 6.2vw, 5.2rem);
  --fs-h2:      clamp(1.85rem, 4.4vw, 3.5rem);
  --fs-h3:      clamp(1.25rem, 2.3vw, 1.85rem);
  --fs-lead:    clamp(1.02rem, 1.5vw, 1.28rem);
  --fs-body:    clamp(0.98rem, 1.05vw, 1.06rem);
  --fs-small:   0.86rem;
  --fs-eyebrow: 0.7rem;

  /* metrics */
  --wrap:   1280px;
  --narrow: 880px;
  --gutter: clamp(20px, 5vw, 72px);
  --sec:    clamp(72px, 11vw, 168px);
  --r-sm: 10px;
  --r-md: 18px;
  --r-lg: 28px;
  --r-xl: 40px;

  --shadow-1: 0 1px 2px rgba(21,23,29,.04), 0 8px 24px -12px rgba(21,23,29,.14);
  --shadow-2: 0 2px 6px rgba(21,23,29,.05), 0 30px 60px -28px rgba(21,23,29,.30);
  --shadow-3: 0 40px 120px -40px rgba(21,23,29,.45);

  --ease: cubic-bezier(.22,.61,.36,1);
  --ease-out: cubic-bezier(.16,1,.3,1);
}

[data-world="academics"] { --accent: var(--c-academics); }
[data-world="science"]   { --accent: var(--c-science); }
[data-world="world"]     { --accent: var(--c-world); }
[data-world="reading"]   { --accent: var(--c-reading); }
[data-world="ai"]        { --accent: var(--c-ai); }
[data-world="languages"] { --accent: var(--c-languages); }

/* ------------------------------------------------------------- 2. FOUNDATION */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--fs-body);
  line-height: 1.62;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}

body.is-locked { overflow: hidden; }

img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; }

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.028em;
  line-height: 1.04;
  text-wrap: balance;
}
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: inherit; }

::selection { background: var(--ink); color: var(--canvas); }

:focus-visible {
  outline: 2.5px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute; left: 12px; top: -100px; z-index: 999;
  background: var(--ink); color: var(--canvas);
  padding: 12px 18px; border-radius: var(--r-sm);
  font-weight: 700; text-decoration: none;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 12px; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.wrap--narrow { max-width: var(--narrow); }
.section { padding-block: var(--sec); position: relative; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* --------------------------------------------------------- 3. TYPE PRIMITIVES */
.eyebrow {
  font-family: var(--mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 22px;
  display: flex; align-items: center; gap: 12px;
  font-weight: 400;
}
.eyebrow::before {
  content: ''; width: 26px; height: 1px; background: var(--accent); flex: none;
  opacity: .85;
}
.eyebrow--plain::before { display: none; }
.eyebrow--center { justify-content: center; }

.ital { font-family: var(--serif); font-style: italic; font-weight: 400; letter-spacing: -0.01em; }

.lead {
  font-size: var(--fs-lead);
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 62ch;
  text-wrap: pretty;
}

.section-head { max-width: 46ch; margin-bottom: clamp(36px, 5vw, 68px); }
.section-head h2 { font-size: var(--fs-h2); margin-bottom: 20px; }
.section-head--center { margin-inline: auto; text-align: center; }
.section-head--center .eyebrow { justify-content: center; }

/* ------------------------------------------------------------- 4. COMPONENTS */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: var(--canvas);
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 26px;
  border: 0; border-radius: 999px;
  background: var(--btn-bg); color: var(--btn-fg);
  font-weight: 700; font-size: .93rem; letter-spacing: -0.01em;
  text-decoration: none; cursor: pointer;
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out), background .25s var(--ease);
  box-shadow: var(--shadow-1);
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.btn:active { transform: translateY(0); }
.btn .arw { transition: transform .35s var(--ease-out); }
.btn:hover .arw { transform: translateX(4px); }

.btn--accent { --btn-bg: var(--accent); --btn-fg: #fff; }
.btn--ghost {
  --btn-bg: transparent; --btn-fg: var(--ink);
  box-shadow: inset 0 0 0 1.5px var(--line-2);
}
.btn--ghost:hover { box-shadow: inset 0 0 0 1.5px var(--ink); }
.btn--inv { --btn-bg: var(--ink-inv); --btn-fg: var(--night); }
.btn--lg { padding: 19px 34px; font-size: 1.02rem; }

.chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: 999px;
  background: transparent; color: var(--ink-2);
  border: 1px solid var(--line-2);
  font-size: .82rem; font-weight: 600; letter-spacing: -0.005em;
  cursor: pointer; white-space: nowrap;
  transition: background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}
.chip .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); flex: none; }
.chip:hover { border-color: var(--ink-3); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--canvas); border-color: var(--ink); }
.chip[aria-pressed="true"] .dot { background: currentColor; }

.rule { height: 1px; background: var(--line); border: 0; margin: 0; }

/* media frame — reserved aspect ratio, zero layout shift ---------------------- */
.frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-md);
  background:
    linear-gradient(150deg,
      color-mix(in srgb, var(--accent) 15%, var(--canvas-2)),
      color-mix(in srgb, var(--accent) 4%, var(--canvas-2)));
  isolation: isolate;
}
.frame::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(21,23,29,.09);
  border-radius: inherit;
  z-index: 3;
}
.frame img {
  width: 100%; height: 100%;
  opacity: 0;
  transition: opacity .7s var(--ease), transform 1.1s var(--ease-out);
  position: relative; z-index: 2;
}
.frame img.is-in { opacity: 1; }
.frame[data-fit="cover"] img { object-fit: cover; }
.frame[data-fit="contain"] img { object-fit: contain; padding: 4%; }

/* the animated shimmer that sits under a loading GIF */
.frame .shimmer {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(100deg,
    transparent 20%,
    color-mix(in srgb, var(--accent) 12%, transparent) 45%,
    transparent 70%);
  background-size: 220% 100%;
  animation: shimmer 2.1s linear infinite;
}
.frame.is-loaded .shimmer, .frame.is-failed .shimmer { display: none; }
@keyframes shimmer { from { background-position: 140% 0; } to { background-position: -140% 0; } }

/* designed fallback — never a broken image ---------------------------------- */
.frame .fallback {
  position: absolute; inset: 0; z-index: 2;
  display: none;
  flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; padding: 24px; text-align: center;
  background:
    radial-gradient(115% 85% at 50% 0%, color-mix(in srgb, var(--accent) 26%, transparent), transparent 72%),
    repeating-linear-gradient(45deg,
      color-mix(in srgb, var(--accent) 9%, transparent) 0 2px,
      transparent 2px 11px),
    var(--canvas-2);
}
.frame.is-failed .fallback { display: flex; }
.frame .fallback svg { width: 46px; height: 46px; color: var(--accent); opacity: .9; }
.frame .fallback b {
  font-size: .95rem; font-weight: 700; letter-spacing: -0.02em; color: var(--ink);
  max-width: 22ch; line-height: 1.25;
}
.frame .fallback span {
  font-family: var(--mono); font-size: .62rem; letter-spacing: .18em;
  text-transform: uppercase; color: var(--ink-3);
}

/* --------------------------------------------------------------- 5. HEADER */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 90;
  transition: background .4s var(--ease), box-shadow .4s var(--ease), backdrop-filter .4s var(--ease);
}
.site-header .bar {
  max-width: var(--wrap); margin-inline: auto;
  padding: 16px var(--gutter);
  display: flex; align-items: center; gap: 24px;
  transition: padding .4s var(--ease);
}
.site-header.is-stuck {
  background: color-mix(in srgb, var(--canvas) 78%, transparent);
  backdrop-filter: saturate(1.6) blur(16px);
  -webkit-backdrop-filter: saturate(1.6) blur(16px);
  box-shadow: 0 1px 0 var(--line);
}
.site-header.is-stuck .bar { padding-block: 10px; }

.brand {
  display: inline-flex; align-items: center; gap: 10px;
  text-decoration: none; font-weight: 800; letter-spacing: -0.05em;
  font-size: 1.16rem; margin-right: auto;
}
.brand .glyph { width: 22px; height: 22px; flex: none; }
.brand em { font-style: normal; color: var(--ink); }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  padding: 9px 14px; border-radius: 999px;
  font-size: .87rem; font-weight: 600; color: var(--ink-2);
  text-decoration: none; white-space: nowrap;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.nav a:hover { color: var(--ink); background: rgba(21,23,29,.05); }
.header-cta { padding: 11px 20px; font-size: .85rem; }

.nav-toggle { display: none; }

@media (max-width: 900px) {
  .nav { display: none; }
  .header-cta { display: none; }
  .nav-toggle {
    display: inline-flex; align-items: center; gap: 9px;
    background: var(--ink); color: var(--canvas);
    border: 0; border-radius: 999px; padding: 10px 18px;
    font-size: .82rem; font-weight: 700; cursor: pointer;
  }
  .nav-toggle .bars { display: grid; gap: 3.5px; }
  .nav-toggle .bars i { display: block; width: 14px; height: 1.6px; background: currentColor; border-radius: 2px; }
}

/* mobile sheet */
.mobile-nav {
  position: fixed; inset: 0; z-index: 95;
  background: color-mix(in srgb, var(--canvas) 96%, transparent);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  display: flex; flex-direction: column; justify-content: center;
  padding: var(--gutter);
  opacity: 0; visibility: hidden;
  transition: opacity .3s var(--ease), visibility .3s;
}
.mobile-nav.is-open { opacity: 1; visibility: visible; }
.mobile-nav a {
  font-size: clamp(1.7rem, 8vw, 2.6rem); font-weight: 700; letter-spacing: -0.04em;
  text-decoration: none; padding: 12px 0; border-bottom: 1px solid var(--line);
}
.mobile-nav .close {
  position: absolute; top: 18px; right: var(--gutter);
  background: none; border: 1px solid var(--line-2); border-radius: 999px;
  width: 44px; height: 44px; cursor: pointer; font-size: 1.2rem;
}

/* ----------------------------------------------------- 6. OPENING ANIMATION */
.intro {
  position: fixed; inset: 0; z-index: 200;
  background: var(--canvas);
  display: grid; place-items: center;
  text-align: center; padding: var(--gutter);
}
.intro[hidden] { display: none !important; }
.intro.is-out { animation: introOut .55s var(--ease-out) forwards; }
@keyframes introOut { to { opacity: 0; visibility: hidden; transform: scale(1.03); } }

.intro q {
  display: block; quotes: none;
  font-size: clamp(1.15rem, 3.6vw, 2.1rem); font-weight: 700; letter-spacing: -0.035em;
  color: var(--ink-3);
  animation: introQ .5s var(--ease-out) both;
}
@keyframes introQ { from { opacity: 0; transform: translateY(10px); } }

.intro .words {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 14px;
  margin: 26px auto 30px; max-width: 640px;
}
.intro .words span {
  font-family: var(--mono); font-size: clamp(.6rem, 2.1vw, .78rem);
  letter-spacing: .18em; text-transform: uppercase; color: var(--ink-2);
  opacity: 0; animation: introW .34s var(--ease-out) forwards;
}
@keyframes introW { from { opacity: 0; transform: translateY(6px) scale(.96); } to { opacity: 1; transform: none; } }

.intro .mark {
  font-size: clamp(2.6rem, 12vw, 6rem); font-weight: 800; letter-spacing: -0.06em;
  opacity: 0; animation: introM .6s var(--ease-out) 1.15s forwards;
}
@keyframes introM { from { opacity: 0; transform: translateY(14px) scale(.97); } to { opacity: 1; transform: none; } }

.intro .skip {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  background: none; border: 0; cursor: pointer;
  font-family: var(--mono); font-size: .62rem; letter-spacing: .2em;
  text-transform: uppercase; color: var(--ink-3);
}

/* ----------------------------------------------------------------- 7. HERO */
.hero {
  position: relative;
  padding-top: clamp(104px, 15vh, 168px);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: -20% -10% auto -10%; height: 130%;
  background:
    radial-gradient(46% 42% at 22% 18%, rgba(42,71,200,.13), transparent 62%),
    radial-gradient(42% 40% at 82% 26%, rgba(110,51,220,.12), transparent 64%),
    radial-gradient(40% 36% at 52% 92%, rgba(10,139,128,.10), transparent 62%);
  filter: blur(6px);
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 2; }

.hero-grid {
  display: grid; gap: clamp(36px, 5vw, 60px);
  grid-template-columns: 1fr;
  align-items: center;
}
@media (min-width: 1040px) {
  .hero-grid { grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr); gap: clamp(40px, 4vw, 72px); }
}

.hero h1 { margin: 0 0 4px; }
.hero .mark {
  display: block;
  font-size: clamp(2.9rem, 9.5vw, 6.6rem);
  font-weight: 800; letter-spacing: -0.062em; line-height: .92;
}
.hero .mark .next {
  background: linear-gradient(96deg, var(--c-academics), var(--c-science) 38%, var(--c-ai) 70%, var(--c-languages));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .claim {
  display: block; margin-top: 18px;
  font-size: clamp(1.32rem, 3.5vw, 2.5rem);
  font-weight: 700; letter-spacing: -0.042em; line-height: 1.08;
  color: var(--ink);
}
.hero .claim b { font-weight: 800; }
.hero .claim .ital { color: var(--ink); }

.verbs {
  display: flex; flex-wrap: wrap; gap: 6px 0; margin: 24px 0 30px;
  font-family: var(--mono); font-size: .68rem; letter-spacing: .2em;
  text-transform: uppercase; color: var(--ink-3);
}
.verbs span { position: relative; padding-right: 16px; margin-right: 4px; }
.verbs span:not(:last-child)::after {
  content: '·'; position: absolute; right: 4px; opacity: .5;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* mobile-first QR arrival: name, claim and both actions inside the first screen */
@media (max-width: 620px) {
  .hero { padding-top: 92px; }
  .hero .verbs { font-size: .6rem; letter-spacing: .15em; margin: 18px 0 20px; }
  .hero .lead { font-size: .95rem; line-height: 1.55; margin-bottom: 22px !important; }
  .hero-actions .btn { flex: 1 1 100%; justify-content: center; padding-block: 17px; }
  .hero-meta { margin-top: 26px; gap: 8px 20px; font-size: .76rem; }
  .universe { margin-top: 14px; }
}

.hero-meta {
  margin-top: 34px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 10px 28px;
  font-size: .8rem; color: var(--ink-3);
}
.hero-meta b { color: var(--ink); font-weight: 700; }

/* --- the constellation ----------------------------------------------------- */
.universe { position: relative; aspect-ratio: 1 / 1; width: 100%; max-width: 620px; margin-inline: auto; }
.universe svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }

.orbit-ring { fill: none; stroke: rgba(21,23,29,.13); stroke-width: 1; }
.orbit-ring--dash { stroke-dasharray: 2 7; stroke: rgba(21,23,29,.18); }
.spoke { stroke: rgba(21,23,29,.10); stroke-width: 1; }

.core-disc { fill: var(--surface); filter: drop-shadow(0 22px 48px rgba(21,23,29,.16)); }
.core-ring { fill: none; stroke: rgba(21,23,29,.10); }
.core-label {
  font-family: var(--sans); font-weight: 800; letter-spacing: -0.05em;
  fill: var(--ink); text-anchor: middle;
}
.core-sub {
  font-family: var(--mono); font-size: 7.4px; letter-spacing: .2em;
  fill: var(--ink-3); text-anchor: middle; text-transform: uppercase;
}

.node { cursor: pointer; }
.node .halo { fill: var(--accent); opacity: 0; transition: opacity .35s var(--ease), r .35s var(--ease-out); }
.node .disc {
  fill: var(--surface); stroke: rgba(21,23,29,.12); stroke-width: 1;
  transition: stroke .3s var(--ease), transform .4s var(--ease-out);
  transform-box: fill-box; transform-origin: center;
}
.node .pip { fill: var(--accent); transition: r .35s var(--ease-out); }
.node .num {
  font-family: var(--mono); font-size: 6px; letter-spacing: .12em;
  fill: var(--ink-3); text-anchor: middle;
}
.node .name {
  font-family: var(--sans); font-size: 8.4px; font-weight: 700; letter-spacing: -0.02em;
  fill: var(--ink); text-anchor: middle;
}
.node:hover .halo, .node:focus-visible .halo, .node.is-active .halo { opacity: .12; }
.node:hover .disc, .node:focus-visible .disc, .node.is-active .disc { stroke: var(--accent); transform: scale(1.06); }
.node:hover .pip, .node.is-active .pip { r: 4.6; }
.node:focus-visible { outline: none; }
.node:focus-visible .disc { stroke-width: 2.5; }

.universe .pulse {
  fill: none; stroke: var(--accent); stroke-width: 1;
  opacity: 0; transform-box: fill-box; transform-origin: center;
  animation: pulse 3.4s var(--ease-out) infinite;
}
@keyframes pulse {
  0%   { opacity: .5; transform: scale(.55); }
  70%  { opacity: 0;  transform: scale(1.25); }
  100% { opacity: 0;  transform: scale(1.25); }
}

/* floating GIF portals inside the constellation */
.portal {
  position: absolute; width: 22%; aspect-ratio: 4 / 5;
  border-radius: 16px; overflow: hidden;
  box-shadow: var(--shadow-2);
  background: var(--canvas-2);
  transform: rotate(var(--rot, 0deg));
  animation: float 9s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}
.portal:nth-child(2) { animation-duration: 11s; }
.portal:nth-child(3) { animation-duration: 13s; }
.portal .frame { border-radius: 0; height: 100%; }
.portal .frame::after { box-shadow: inset 0 0 0 1px rgba(255,255,255,.35); }
/* inside a portal the label below already names the experience, so the
   fallback shows only its glyph and pattern — never two stacked names */
.portal .fallback b, .portal .fallback span { display: none; }
.portal .fallback svg { width: 34px; height: 34px; }
.portal .tag {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 4;
  padding: 16px 10px 8px;
  background: linear-gradient(transparent, rgba(10,13,22,.72));
  color: #fff; font-family: var(--mono); font-size: .54rem;
  letter-spacing: .16em; text-transform: uppercase; text-align: center;
}
/* when a portal falls back to its designed panel the label flips to dark ink,
   so it stays readable over the light pattern */
.portal:has(.frame.is-failed) .tag {
  background: linear-gradient(transparent, rgba(251,248,243,.94));
  color: var(--ink);
}
@keyframes float {
  0%, 100% { transform: rotate(var(--rot,0deg)) translateY(0); }
  50%      { transform: rotate(var(--rot,0deg)) translateY(-11px); }
}
/* the six world nodes sit on a circle, which leaves all four corners of the
   square free — the portals live there and never collide with a node */
.portal--a { top: 0;    left: 0;  --rot: -5deg;   --delay: 0s; }
.portal--b { bottom: 0; right: 0; --rot: 4.5deg;  --delay: 1.2s; }
.portal--c { bottom: 0; left: 0;  --rot: -2.5deg; --delay: 2.4s; }

@media (max-width: 1039px) {
  .universe { max-width: 520px; }
}
@media (max-width: 620px) {
  .portal--c { display: none; }
  .portal { width: 25%; }
  .universe { max-width: 430px; }
}

/* world preview card that appears on node hover/tap */
.world-peek {
  position: absolute; left: 50%; bottom: -6px; transform: translate(-50%, 12px);
  width: min(300px, 84%); z-index: 6;
  background: var(--surface); border-radius: var(--r-md);
  box-shadow: var(--shadow-2); border: 1px solid var(--line);
  padding: 16px 18px;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity .3s var(--ease), transform .35s var(--ease-out), visibility .3s;
}
.world-peek.is-on { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.world-peek .k {
  font-family: var(--mono); font-size: .6rem; letter-spacing: .2em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 6px;
}
.world-peek h3 { font-size: 1.02rem; margin-bottom: 6px; }
.world-peek p { font-size: .8rem; color: var(--ink-2); line-height: 1.45; margin: 0; }
.world-peek .items {
  margin-top: 10px; display: flex; flex-wrap: wrap; gap: 5px;
}
.world-peek .items i {
  font-style: normal; font-size: .66rem; padding: 3px 8px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 10%, transparent); color: var(--accent);
  font-weight: 600;
}

/* --------------------------------------------------------------- 8. STATS */
.stats { border-block: 1px solid var(--line); background: var(--canvas-2); }
.stats .wrap { padding-block: clamp(40px, 6vw, 76px); }
.stats-grid {
  display: grid; gap: clamp(28px, 4vw, 44px);
  grid-template-columns: repeat(2, 1fr);
}
@media (min-width: 800px) { .stats-grid { grid-template-columns: repeat(4, 1fr); } }

.stat .n {
  font-size: clamp(2.6rem, 6.4vw, 5rem); font-weight: 800;
  letter-spacing: -0.06em; line-height: .9; color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.stat .n em { font-style: normal; color: var(--accent); }
.stat .l {
  margin-top: 12px; font-family: var(--mono);
  font-size: .64rem; letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3);
  line-height: 1.7;
}
.stat:nth-child(1) { --accent: var(--c-academics); }
.stat:nth-child(2) { --accent: var(--c-science); }
.stat:nth-child(3) { --accent: var(--c-world); }
.stat:nth-child(4) { --accent: var(--c-ai); }

.stats-note {
  margin-top: 26px; font-size: .74rem; color: var(--ink-3);
}

/* ----------------------------------------------------- 9. BROCHURE BRIDGE */
.bridge { background: var(--canvas); }
.bridge .inner {
  display: grid; gap: clamp(26px, 4vw, 56px); align-items: center;
  grid-template-columns: 1fr;
}
@media (min-width: 860px) { .bridge .inner { grid-template-columns: 1.1fr 1fr; } }
.bridge h2 { font-size: clamp(1.5rem, 3.2vw, 2.5rem); }
.bridge h2 .dim { color: var(--ink-3); }

.steps { display: grid; gap: 2px; }
.step {
  display: grid; grid-template-columns: auto 1fr; gap: 18px; align-items: baseline;
  padding: 18px 0; border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step .i { font-family: var(--mono); font-size: .66rem; color: var(--accent); letter-spacing: .18em; }
.step b { font-size: 1.05rem; letter-spacing: -0.03em; display: block; margin-bottom: 2px; }
.step p { font-size: .88rem; color: var(--ink-2); margin: 0; }
.step:nth-child(1) { --accent: var(--c-academics); }
.step:nth-child(2) { --accent: var(--c-science); }
.step:nth-child(3) { --accent: var(--c-world); }

/* ------------------------------------------------- 10. TEXTBOOK → UNIVERSE */
.journey { background: var(--canvas-2); border-block: 1px solid var(--line); overflow: hidden; }
.journey h2 { font-size: var(--fs-h2); }
.journey .track {
  margin-top: clamp(38px, 5vw, 64px);
  display: grid; gap: 0;
}
.jstep {
  display: grid; grid-template-columns: 74px 1fr; gap: clamp(14px, 3vw, 32px);
  padding: clamp(18px, 2.6vw, 30px) 0;
  border-top: 1px solid var(--line);
  align-items: center;
  position: relative;
}
.jstep:last-child { border-bottom: 1px solid var(--line); }
.jstep .idx {
  font-family: var(--mono); font-size: .64rem; letter-spacing: .16em; color: var(--ink-3);
  display: flex; align-items: center; gap: 10px;
}
.jstep .idx::after {
  content: ''; width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); opacity: .25;
  transition: opacity .5s var(--ease), transform .5s var(--ease-out);
}
.jstep.is-in .idx::after { opacity: 1; transform: scale(1.35); }
.jstep .t {
  font-size: clamp(1.5rem, 4.6vw, 3.1rem); font-weight: 700; letter-spacing: -0.05em;
  color: var(--ink-3); line-height: 1;
  transition: color .6s var(--ease);
}
.jstep.is-in .t { color: var(--ink); }
.jstep .d {
  font-size: .87rem; color: var(--ink-2); margin-top: 8px; max-width: 52ch;
}
@media (min-width: 900px) {
  .jstep { grid-template-columns: 90px minmax(0, 300px) 1fr; }
  .jstep .d { margin-top: 0; }
}
.jstep:nth-child(1) { --accent: var(--c-academics); }
.jstep:nth-child(2) { --accent: var(--c-academics); }
.jstep:nth-child(3) { --accent: var(--c-science); }
.jstep:nth-child(4) { --accent: var(--c-science); }
.jstep:nth-child(5) { --accent: var(--c-world); }
.jstep:nth-child(6) { --accent: var(--c-ai); }
.jstep:nth-child(7) { --accent: var(--c-languages); }

/* ------------------------------------------------------- 11. LEARNING WORLDS */
.worlds-grid {
  display: grid; gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden;
  grid-template-columns: 1fr;
}
@media (min-width: 700px) { .worlds-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .worlds-grid { grid-template-columns: repeat(3, 1fr); } }

.world-card {
  background: var(--canvas);
  padding: clamp(26px, 3vw, 38px);
  display: flex; flex-direction: column; gap: 12px;
  text-decoration: none; position: relative;
  transition: background .35s var(--ease);
  min-height: 260px;
}
.world-card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(90% 70% at 50% 100%, color-mix(in srgb, var(--accent) 13%, transparent), transparent 70%);
  opacity: 0; transition: opacity .45s var(--ease); pointer-events: none;
}
.world-card:hover::before { opacity: 1; }
.world-card .idx {
  font-family: var(--mono); font-size: .64rem; letter-spacing: .2em; color: var(--accent);
}
.world-card h3 { font-size: 1.42rem; letter-spacing: -0.04em; }
.world-card p { font-size: .88rem; color: var(--ink-2); margin: 0; }
.world-card .foot {
  margin-top: auto; padding-top: 18px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  font-size: .78rem; color: var(--ink-3);
}
.world-card .count { font-family: var(--mono); font-size: .68rem; letter-spacing: .1em; }
.world-card .go {
  display: inline-flex; align-items: center; gap: 7px; color: var(--accent); font-weight: 700;
}
.world-card .go svg { transition: transform .35s var(--ease-out); }
.world-card:hover .go svg { transform: translateX(4px); }
.world-card .bar {
  position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--accent);
  transform: scaleY(0); transform-origin: top; transition: transform .5s var(--ease-out);
}
.world-card:hover .bar { transform: scaleY(1); }

/* -------------------------------------------------- 12. HERO EXPERIENCES */
.chapters { background: var(--canvas); }
.chapter { padding-block: clamp(56px, 7vw, 104px); border-top: 1px solid var(--line); }
.chapter:first-of-type { border-top: 0; }

.chapter-inner {
  display: grid; gap: clamp(26px, 4vw, 60px); align-items: center;
  grid-template-columns: 1fr;
}
@media (min-width: 960px) {
  .chapter-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr); }
  .chapter:nth-of-type(even) .chapter-inner > .chapter-media { order: -1; }
}

.chapter .num {
  font-family: var(--mono); font-size: .66rem; letter-spacing: .22em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 16px;
  display: flex; align-items: center; gap: 12px;
}
.chapter .num::after { content: ''; height: 1px; flex: 1; max-width: 90px; background: color-mix(in srgb, var(--accent) 35%, transparent); }
.chapter h3 { font-size: clamp(1.9rem, 4.6vw, 3.3rem); margin-bottom: 14px; }
.chapter .tag {
  font-size: var(--fs-lead); color: var(--ink-2); margin-bottom: 20px; max-width: 40ch;
  font-weight: 500; letter-spacing: -0.015em;
}
.chapter .facts { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.chapter .facts li {
  list-style: none; font-size: .78rem; font-weight: 600;
  padding: 7px 13px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 9%, transparent);
  color: color-mix(in srgb, var(--accent) 78%, var(--ink));
}
.chapter .facts { padding: 0; margin-block: 0 26px; }
.chapter .actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

.chapter-media { position: relative; }
.chapter-media .frame { aspect-ratio: 16 / 11; border-radius: var(--r-lg); box-shadow: var(--shadow-2); }
.chapter-media .frame img { transform: scale(1.005); }
.chapter-media:hover .frame img { transform: scale(1.03); }

.chapter-media .stack {
  position: absolute; right: -8px; bottom: -26px; width: 34%;
  display: grid; gap: 10px;
}
@media (max-width: 959px) { .chapter-media .stack { position: static; width: 100%; grid-template-columns: 1fr 1fr; margin-top: 12px; } }
.chapter-media .stack .frame { aspect-ratio: 4 / 3; border-radius: var(--r-md); box-shadow: var(--shadow-1); }

.companions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 18px; }
.companions .c {
  font-family: var(--mono); font-size: .62rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-3); border: 1px solid var(--line-2); border-radius: 999px; padding: 5px 11px;
  background: none; cursor: pointer;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}
.companions .c:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------------------------------------------------- 13. EXPLORER */
.explorer { background: var(--canvas-2); border-block: 1px solid var(--line); }

.search-bar {
  position: relative; max-width: 620px; margin: 0 auto clamp(22px, 3vw, 34px);
}
.search-bar input {
  width: 100%; padding: 18px 52px 18px 52px;
  border-radius: 999px; border: 1px solid var(--line-2);
  background: var(--surface); color: var(--ink);
  font-family: inherit; font-size: 1rem; letter-spacing: -0.01em;
  box-shadow: var(--shadow-1);
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.search-bar input::placeholder { color: var(--ink-3); }
.search-bar input:focus { outline: none; border-color: var(--ink); box-shadow: var(--shadow-2); }
.search-bar .ico {
  position: absolute; left: 20px; top: 50%; transform: translateY(-50%);
  color: var(--ink-3); pointer-events: none;
}
.search-bar .clear {
  position: absolute; right: 14px; top: 50%; transform: translateY(-50%);
  width: 30px; height: 30px; border-radius: 50%; border: 0; cursor: pointer;
  background: var(--canvas-3); color: var(--ink-2); display: none;
  align-items: center; justify-content: center;
}
.search-bar.has-value .clear { display: flex; }

.suggests {
  display: flex; flex-wrap: wrap; gap: 6px; justify-content: center;
  margin-bottom: 26px; font-size: .76rem; color: var(--ink-3);
}
.suggests button {
  background: none; border: 0; cursor: pointer; color: var(--ink-2);
  text-decoration: underline; text-underline-offset: 3px;
  text-decoration-color: var(--line-2); padding: 2px 4px; font-size: .76rem;
}
.suggests button:hover { color: var(--ink); text-decoration-color: currentColor; }

.filters {
  display: flex; gap: 8px; margin-bottom: clamp(24px, 3vw, 38px);
  overflow-x: auto; padding-bottom: 6px;
  scrollbar-width: none; -ms-overflow-style: none;
  scroll-snap-type: x proximity;
}
.filters::-webkit-scrollbar { display: none; }
.filters .chip { scroll-snap-align: start; }
@media (min-width: 900px) { .filters { flex-wrap: wrap; justify-content: center; overflow: visible; } }

.result-count {
  font-family: var(--mono); font-size: .66rem; letter-spacing: .18em;
  text-transform: uppercase; color: var(--ink-3);
  margin-bottom: 18px; text-align: center; min-height: 1em;
}

.cards {
  display: grid; gap: clamp(14px, 1.6vw, 22px);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 264px), 1fr));
}

.card {
  position: relative; display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--r-md); overflow: hidden;
  text-align: left; cursor: pointer; padding: 0;
  transition: transform .4s var(--ease-out), box-shadow .4s var(--ease-out), border-color .3s var(--ease);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); border-color: transparent; }
.card:hover .frame img { transform: scale(1.045); }
.card .frame { aspect-ratio: 16 / 10; border-radius: 0; }
.card .body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card .wtag {
  font-family: var(--mono); font-size: .58rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--accent); display: flex; align-items: center; gap: 7px;
}
.card .wtag::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.card h3 { font-size: 1.06rem; letter-spacing: -0.035em; }
.card p { font-size: .82rem; color: var(--ink-2); line-height: 1.5; margin: 0; }
.card .more {
  margin-top: auto; padding: 12px 0 0;
  font-size: .75rem; font-weight: 700; color: var(--accent);
  display: inline-flex; align-items: center; gap: 6px;
  background: none; border: 0; cursor: pointer; align-self: flex-start;
  font-family: inherit;
}
.card .more svg { transition: transform .3s var(--ease-out); }
.card:hover .more svg { transform: translateX(3px); }
.card.is-hero .body::after {
  content: 'HERO EXPERIENCE'; position: absolute; top: 12px; left: 12px;
  font-family: var(--mono); font-size: .52rem; letter-spacing: .16em;
  background: rgba(10,13,22,.72); color: #fff; padding: 4px 8px; border-radius: 999px;
  backdrop-filter: blur(6px); z-index: 4;
}

/* mobile: a compact two-up mosaic — the scale of the ecosystem in one screen.
   The full description lives one tap away in the modal. */
@media (max-width: 620px) {
  .cards { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .card .body { padding: 12px 13px 14px; gap: 6px; }
  .card h3 { font-size: .92rem; letter-spacing: -0.03em; line-height: 1.2; }
  .card .body > p { display: none; }
  .card .wtag { font-size: .52rem; letter-spacing: .14em; }
  .card .more { font-size: .7rem; padding-top: 8px; }
  .card.is-hero .body::after { font-size: .46rem; padding: 3px 6px; top: 9px; left: 9px; }
  .card .frame { aspect-ratio: 4 / 3; }
  .card .fallback svg { width: 30px; height: 30px; }
}

/* in the grid the card's own title sits directly under the frame, so the
   fallback stays purely graphic rather than printing the name twice */
.card .fallback b, .card .fallback span { display: none; }
.card .fallback svg { width: 38px; height: 38px; }

.empty {
  text-align: center; padding: 60px 20px; color: var(--ink-3);
  grid-column: 1 / -1;
}
.empty b { display: block; font-size: 1.2rem; color: var(--ink); margin-bottom: 8px; }

/* ------------------------------------------------------ 14. LEARNING MAP */
.map { background: var(--night); color: var(--ink-inv); position: relative; overflow: hidden; }
.map::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(60% 50% at 15% 10%, rgba(42,71,200,.30), transparent 60%),
    radial-gradient(50% 45% at 85% 25%, rgba(110,51,220,.26), transparent 60%),
    radial-gradient(60% 50% at 50% 100%, rgba(10,139,128,.20), transparent 62%);
  pointer-events: none;
}
.map .wrap { position: relative; z-index: 2; }
.map .eyebrow { color: var(--ink-inv-2); }
.map .eyebrow::before { background: var(--ink-inv-2); }
.map h2 { color: var(--ink-inv); }
.map .lead { color: var(--ink-inv-2); }

.map-figure { position: relative; margin-top: clamp(30px, 4vw, 52px); }
.map-figure svg { width: 100%; height: auto; overflow: visible; }
.map-link { stroke: rgba(246,243,236,.16); stroke-width: 1; fill: none; transition: stroke .35s var(--ease), stroke-width .35s var(--ease); }
.map-link.is-lit { stroke: var(--accent); stroke-width: 1.6; }
.map-hub { cursor: pointer; }
.map-hub circle { fill: rgba(246,243,236,.06); stroke: rgba(246,243,236,.3); transition: fill .3s var(--ease), stroke .3s var(--ease); }
.map-hub:hover circle, .map-hub.is-active circle { fill: color-mix(in srgb, var(--accent) 28%, transparent); stroke: var(--accent); }
.map-hub text { fill: var(--ink-inv); font-family: var(--sans); font-weight: 700; font-size: 10px; letter-spacing: -0.02em; text-anchor: middle; }
.map-hub .hub-name {
  font-size: 8.6px; font-weight: 700; letter-spacing: .01em;
  fill: rgba(246,243,236,.5); transition: fill .3s var(--ease);
}
.map-hub:hover .hub-name, .map-hub.is-active .hub-name { fill: var(--ink-inv); }
.map-leaf { cursor: pointer; }
.map-leaf circle { fill: rgba(246,243,236,.14); transition: fill .3s var(--ease), r .3s var(--ease-out); }
.map-leaf text { fill: rgba(246,243,236,.6); font-family: var(--mono); font-size: 6.6px; letter-spacing: .02em; transition: fill .3s var(--ease); }
.map-leaf:hover circle, .map-leaf.is-lit circle { fill: var(--accent); }
.map-leaf:hover text, .map-leaf.is-lit text { fill: var(--ink-inv); }
.map-note { margin-top: 20px; font-size: .76rem; color: var(--ink-inv-2); text-align: center; }

@media (max-width: 760px) {
  .map-figure { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .map-figure svg { min-width: 680px; }
}

/* -------------------------------------------------------- 15. DISCOVERY */
.discovery { background: var(--canvas); }
.discovery .panel {
  border: 1px solid var(--line); border-radius: var(--r-xl);
  background: var(--surface); box-shadow: var(--shadow-1);
  padding: clamp(30px, 5vw, 64px); text-align: center;
  position: relative; overflow: hidden;
}
.discovery .panel::before {
  content: ''; position: absolute; inset: -50% -10% auto -10%; height: 150%;
  background: radial-gradient(50% 40% at 50% 0%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 65%);
  transition: opacity .6s var(--ease); pointer-events: none;
}
.discovery h2 { font-size: clamp(1.6rem, 4vw, 2.8rem); margin-bottom: 12px; position: relative; }
.discovery .sub { color: var(--ink-2); margin-bottom: 30px; position: relative; }

.discovery .result {
  position: relative; min-height: 148px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  margin-bottom: 26px;
}
.discovery .result .idle { color: var(--ink-3); font-size: .9rem; }
.discovery .card-out { animation: swap .45s var(--ease-out); }
@keyframes swap { from { opacity: 0; transform: translateY(12px) scale(.98); } }
.discovery .result .w {
  font-family: var(--mono); font-size: .62rem; letter-spacing: .2em; text-transform: uppercase; color: var(--accent);
}
.discovery .result .n { font-size: clamp(1.5rem, 4vw, 2.4rem); font-weight: 800; letter-spacing: -0.05em; }
.discovery .result .p { color: var(--ink-2); max-width: 44ch; }

/* ------------------------------------------------------- 16. WHY LIBNEXT */
.why { background: var(--canvas-2); border-block: 1px solid var(--line); }
.pillars { display: grid; gap: clamp(20px, 2.4vw, 34px); grid-template-columns: 1fr; }
@media (min-width: 680px) { .pillars { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1020px) { .pillars { grid-template-columns: repeat(3, 1fr); } }
.pillar { padding-top: 22px; border-top: 2px solid var(--accent); }
.pillar .i { font-family: var(--mono); font-size: .62rem; letter-spacing: .2em; color: var(--ink-3); margin-bottom: 12px; }
.pillar h3 { font-size: 1.16rem; letter-spacing: -0.035em; margin-bottom: 8px; }
.pillar p { font-size: .87rem; color: var(--ink-2); margin: 0; }
.pillar:nth-child(1) { --accent: var(--c-academics); }
.pillar:nth-child(2) { --accent: var(--c-science); }
.pillar:nth-child(3) { --accent: var(--c-reading); }
.pillar:nth-child(4) { --accent: var(--c-world); }
.pillar:nth-child(5) { --accent: var(--c-ai); }
.pillar:nth-child(6) { --accent: var(--c-languages); }

/* --------------------------------------------------- 17. PRINCIPAL MOMENT */
.principal {
  background: var(--night); color: var(--ink-inv);
  position: relative; overflow: hidden; text-align: center;
}
.principal::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(46% 44% at 50% 8%, rgba(200,30,110,.24), transparent 62%),
    radial-gradient(60% 50% at 12% 90%, rgba(42,71,200,.28), transparent 62%),
    radial-gradient(52% 48% at 90% 70%, rgba(110,51,220,.24), transparent 62%);
}
.principal .stars { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .55; }
.principal .wrap { position: relative; z-index: 2; }
.principal h2 {
  font-size: clamp(1.9rem, 5.6vw, 4.4rem); color: var(--ink-inv);
  max-width: 20ch; margin-inline: auto;
}
.principal h2 .ital { color: #fff; }

.ingredients {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 10px;
  margin: clamp(34px, 5vw, 56px) auto clamp(28px, 4vw, 44px); max-width: 780px;
}
.ingredients span {
  font-family: var(--mono); font-size: clamp(.6rem, 1.8vw, .74rem);
  letter-spacing: .16em; text-transform: uppercase;
  padding: 9px 15px; border-radius: 999px;
  border: 1px solid var(--line-inv); color: var(--ink-inv-2);
  transition: color .4s var(--ease), border-color .4s var(--ease), background .4s var(--ease);
}
.principal.is-in .ingredients span { color: var(--ink-inv); border-color: rgba(246,243,236,.4); }

.converge {
  display: grid; justify-items: center; gap: 16px;
}
.converge .arrow { color: var(--ink-inv-2); }
.converge .out {
  font-size: clamp(2.6rem, 10vw, 6.4rem); font-weight: 800; letter-spacing: -0.06em; line-height: 1;
  background: linear-gradient(96deg, #9DB2FF, #C9A6FF 40%, #FF9CC8 72%, #FFC59C);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.principal .after { color: var(--ink-inv-2); max-width: 52ch; margin: 22px auto 0; }

/* --------------------------------------------------- 18. MODERN SCHOOL */
.modern { background: var(--canvas); }
.equation {
  display: grid; gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden;
  grid-template-columns: repeat(2, 1fr);
  margin-top: clamp(30px, 4vw, 50px);
}
@media (min-width: 760px) { .equation { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1080px) { .equation { grid-template-columns: repeat(6, 1fr); } }
.eq {
  background: var(--canvas); padding: clamp(22px, 2.6vw, 32px) clamp(18px, 2vw, 26px);
  display: flex; flex-direction: column; gap: 10px; min-height: 190px;
  position: relative;
}
.eq .ico { color: var(--accent); }
.eq b { font-size: 1rem; letter-spacing: -0.03em; }
.eq p { font-size: .8rem; color: var(--ink-2); margin: 0; }
.eq:nth-child(1) { --accent: var(--c-reading); }
.eq:nth-child(2) { --accent: var(--c-academics); }
.eq:nth-child(3) { --accent: var(--c-science); }
.eq:nth-child(4) { --accent: var(--c-ai); }
.eq:nth-child(5) { --accent: var(--c-languages); }
.eq:nth-child(6) { --accent: var(--c-world); }

.equals {
  margin-top: clamp(26px, 3vw, 40px);
  display: flex; flex-direction: column; align-items: center; gap: 14px; text-align: center;
}
.equals .sum {
  font-size: clamp(2.4rem, 9vw, 5.4rem); font-weight: 800; letter-spacing: -0.06em; line-height: 1;
}
.equals .sum .next {
  background: linear-gradient(96deg, var(--c-academics), var(--c-science) 38%, var(--c-ai) 70%, var(--c-languages));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.equals p { color: var(--ink-2); max-width: 50ch; }

/* --------------------------------------------------------------- 19. CTA */
.cta { background: var(--canvas-2); border-top: 1px solid var(--line); text-align: center; }
.cta h2 { font-size: clamp(2rem, 6vw, 4.2rem); margin-bottom: 18px; }
.cta .big {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .22em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 30px;
}
.cta .btn { margin-top: 8px; }
.cta .fine { margin-top: 26px; font-size: .78rem; color: var(--ink-3); }

/* ------------------------------------------------------------ 20. FOOTER */
.site-footer { background: var(--canvas); border-top: 1px solid var(--line); padding-block: clamp(40px, 5vw, 64px); }
.foot-grid {
  display: grid; gap: 28px; grid-template-columns: 1fr;
  align-items: start;
}
@media (min-width: 760px) { .foot-grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.site-footer .brand { font-size: 1.3rem; margin-bottom: 12px; }
.site-footer p { font-size: .82rem; color: var(--ink-3); max-width: 42ch; }
.foot-col h4 { font-family: var(--mono); font-size: .62rem; letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 14px; font-weight: 400; }
.foot-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.foot-col a, .foot-col button {
  font-size: .85rem; color: var(--ink-2); text-decoration: none; background: none; border: 0; padding: 0;
  cursor: pointer; text-align: left;
}
.foot-col a:hover, .foot-col button:hover { color: var(--ink); }
.foot-bottom {
  margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between;
  font-size: .76rem; color: var(--ink-3);
}

/* ------------------------------------------------------- 21. SERVICE MODAL */
.modal-root {
  position: fixed; inset: 0; z-index: 150;
  display: grid; place-items: end center;
  visibility: hidden;
}
.modal-root.is-open { visibility: visible; }
.modal-root .scrim {
  position: absolute; inset: 0; background: rgba(10,13,22,.44);
  backdrop-filter: blur(5px); -webkit-backdrop-filter: blur(5px);
  opacity: 0; transition: opacity .4s var(--ease);
}
.modal-root.is-open .scrim { opacity: 1; }

.modal {
  position: relative; z-index: 2;
  width: min(680px, 100%); max-height: 92vh;
  background: var(--canvas); border-radius: var(--r-lg) var(--r-lg) 0 0;
  box-shadow: var(--shadow-3);
  overflow-y: auto; overscroll-behavior: contain;
  transform: translateY(28px) scale(.985); opacity: 0;
  transition: transform .5s var(--ease-out), opacity .35s var(--ease);
}
.modal-root.is-open .modal { transform: none; opacity: 1; }
/* the dialog receives focus programmatically; its own ring would read as an error */
.modal:focus, .modal:focus-visible { outline: none; }
@media (min-width: 760px) {
  .modal-root { place-items: center; padding: 24px; }
  .modal { border-radius: var(--r-lg); max-height: 88vh; }
}

.modal .hero-media { position: relative; }
.modal .hero-media .frame { aspect-ratio: 16 / 9; border-radius: 0; }
@media (min-width: 760px) { .modal .hero-media .frame { border-radius: var(--r-lg) var(--r-lg) 0 0; } }
.modal .close {
  position: absolute; top: 14px; right: 14px; z-index: 6;
  width: 40px; height: 40px; border-radius: 50%; border: 0; cursor: pointer;
  background: rgba(10,13,22,.55); color: #fff;
  backdrop-filter: blur(8px);
  display: grid; place-items: center;
  transition: background .25s var(--ease), transform .25s var(--ease-out);
}
.modal .close:hover { background: rgba(10,13,22,.8); transform: rotate(90deg); }
.modal .grip {
  width: 40px; height: 4px; border-radius: 99px; background: rgba(255,255,255,.7);
  position: absolute; top: 10px; left: 50%; transform: translateX(-50%); z-index: 6;
}
@media (min-width: 760px) { .modal .grip { display: none; } }

.modal .content { padding: clamp(24px, 4vw, 40px); }
.modal .wtag {
  font-family: var(--mono); font-size: .6rem; letter-spacing: .2em; text-transform: uppercase;
  color: var(--accent); display: flex; align-items: center; gap: 8px; margin-bottom: 14px;
}
.modal .wtag::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.modal h2 { font-size: clamp(1.6rem, 4.4vw, 2.4rem); margin-bottom: 10px; }
.modal .tagline { font-size: var(--fs-lead); color: var(--ink-2); margin-bottom: 24px; font-weight: 500; }

.modal .keys { margin: 0 0 26px; padding: 0; list-style: none; display: grid; gap: 1px; background: var(--line); border-radius: var(--r-sm); overflow: hidden; border: 1px solid var(--line); }
.modal .keys li {
  background: var(--canvas); padding: 12px 16px; font-size: .85rem; font-weight: 600;
  display: flex; align-items: center; gap: 11px;
}
.modal .keys li::before {
  content: ''; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); flex: none;
}

.modal .prose h4 {
  font-family: var(--mono); font-size: .62rem; letter-spacing: .2em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 12px; font-weight: 400;
}
.modal .prose p { font-size: .93rem; color: var(--ink-2); line-height: 1.68; }
.modal .sig {
  margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--line);
  font-size: 1.05rem; font-weight: 700; letter-spacing: -0.03em; color: var(--ink);
}
.modal .foot { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.modal .nav-pair { margin-left: auto; display: flex; gap: 6px; }
.modal .nav-pair button {
  width: 42px; height: 42px; border-radius: 50%; border: 1px solid var(--line-2);
  background: none; cursor: pointer; display: grid; place-items: center; color: var(--ink-2);
  transition: border-color .25s var(--ease), color .25s var(--ease);
}
.modal .nav-pair button:hover { border-color: var(--ink); color: var(--ink); }
.modal .src {
  margin-top: 18px; font-size: .7rem; color: var(--ink-3);
}

/* ------------------------------------------------------------ 22. REVEALS */
.reveal { opacity: 0; transform: translateY(18px); }
.reveal.is-in { opacity: 1; transform: none; transition: opacity .8s var(--ease), transform .9s var(--ease-out); }
.reveal-d1.is-in { transition-delay: .07s; }
.reveal-d2.is-in { transition-delay: .14s; }
.reveal-d3.is-in { transition-delay: .21s; }

/* --------------------------------------------------- 23. REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
  .portal { animation: none !important; }
  .frame .shimmer { animation: none; opacity: .35; }
  .jstep .t { color: var(--ink); }
  .intro { display: none !important; }
}

/* --------------------------------------------------------- 24. PRINT */
@media print {
  .site-header, .intro, .modal-root, .portal, .filters, .search-bar { display: none !important; }
  body { background: #fff; }
  .reveal { opacity: 1 !important; transform: none !important; }
}