/* APX: quiet, monochrome editorial layout (cosmos.so-inspired) with a game layer.
   Colour is reserved for game feedback and data: amber = XP/reward/highlight, green = correct, clay = wrong. */
:root {
  --bg: #ffffff;
  --bg-2: #f6f5f3;
  --ink: #0b0b0c;
  --ink-2: #57575c;
  --ink-3: #9a9a9f;
  --hair: #e8e6e2;

  --sage: #a9ad9b;
  --sage-2: #c9ccbd;
  --sand: #e6d3b3;
  --clay: #b8462a;

  --amber: #e7a23a;
  --amber-soft: #fbf0dc;
  --green: #2f8a57;
  --green-soft: #e3f1e8;
  --red: #c4472c;
  --red-soft: #f8e4de;

  --font: "Geist", "Helvetica Neue", Helvetica, sans-serif;
  --r: 18px;
  --r-lg: 28px;
  --gutter: clamp(16px, 3.4vw, 48px);
  --out: cubic-bezier(0.22, 1, 0.36, 1);
  --spring: cubic-bezier(0.34, 1.4, 0.64, 1);
}

/* Cross-page transitions (Chromium): pages blur-swap, the nav stays put. */
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: vt-out 0.35s var(--out) both; }
::view-transition-new(root) { animation: vt-in 0.5s var(--out) both; }
@keyframes vt-out { to { opacity: 0; filter: blur(8px); } }
@keyframes vt-in { from { opacity: 0; filter: blur(8px); transform: translateY(12px); } }

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; color: inherit; }
::selection { background: var(--ink); color: #fff; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; border-radius: 8px; }

h1, h2, h3 { margin: 0; font-weight: 400; }
h1 { font-size: clamp(48px, 6.4vw, 92px); line-height: 0.98; letter-spacing: -0.055em; font-weight: 350; }
h2 { font-size: clamp(38px, 5vw, 68px); line-height: 1.02; letter-spacing: -0.045em; }
h3 { font-size: 21px; letter-spacing: -0.02em; font-weight: 500; }
p { margin: 0; }
.sub { font-size: clamp(18px, 1.7vw, 22px); line-height: 1.35; color: var(--ink-2); letter-spacing: -0.01em; }
.muted { color: var(--ink-3); }
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 var(--gutter); }
section { padding: clamp(90px, 12vw, 160px) 0; position: relative; }
.center { text-align: center; }
.head { max-width: 760px; margin: 0 auto clamp(40px, 5vw, 64px); text-align: center; }
.head .sub { margin-top: 18px; }
.more { display: inline-flex; align-items: center; gap: 6px; margin-top: 28px; font-size: 15px; border-bottom: 1px solid var(--ink); padding-bottom: 2px; transition: gap 0.3s var(--spring); }
.more:hover { gap: 12px; }
.more::after { content: "→"; }
.source { margin-top: 14px; font-size: 12px; color: var(--ink-3); }
.source a { text-decoration: underline; text-underline-offset: 2px; }

/* ---------- Pills ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 22px;
  border: 0;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.25s var(--spring), background 0.2s, box-shadow 0.2s;
}
.pill:hover { transform: scale(1.03); }
.pill:active { transform: scale(0.97); }
.pill--light { background: var(--bg); color: var(--ink); box-shadow: inset 0 0 0 1px var(--hair), 0 1px 2px rgba(0, 0, 0, 0.04); }
.pill--light:hover { background: var(--bg-2); }
.pill--amber { background: var(--amber); color: var(--ink); }
.pill--sm { height: 40px; padding: 0 18px; font-size: 14px; }
.pill--xl { height: clamp(64px, 7vw, 92px); padding: 0 clamp(28px, 4vw, 48px); font-size: clamp(24px, 3vw, 40px); letter-spacing: -0.04em; font-weight: 400; }
.pill--block { width: 100%; }

/* ---------- Nav: logo · glass link bar · action ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 14px var(--gutter) 26px;
  background: linear-gradient(var(--bg) 50%, rgba(255, 255, 255, 0));
  transition: transform 0.5s var(--out);
  view-transition-name: site-nav;
}
.nav.is-hidden { transform: translateY(-110%); }
.nav__brand { display: flex; align-items: center; gap: 10px; font-size: 15px; font-weight: 500; letter-spacing: -0.02em; }
.nav__brand svg { width: 38px; height: 20px; flex: none; max-width: none; }
.nav__links {
  display: flex;
  gap: 2px;
  padding: 4px;
  border-radius: 999px;
  background: rgba(246, 245, 243, 0.7);
  -webkit-backdrop-filter: blur(16px) saturate(170%);
  backdrop-filter: blur(16px) saturate(170%);
  box-shadow: inset 0 0 0 1px rgba(232, 230, 226, 0.9), inset 0 1px 0 rgba(255, 255, 255, 0.9);
}
.nav__links { position: relative; }
.nav__pill { position: absolute; top: 4px; bottom: 4px; left: 0; width: 0; border-radius: 999px; background: var(--bg); box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08); opacity: 0; transition: transform 0.45s var(--spring), width 0.45s var(--spring), opacity 0.25s; pointer-events: none; }
.nav__links a { position: relative; z-index: 1; padding: 8px 16px; border-radius: 999px; font-size: 14px; color: var(--ink-2); transition: color 0.2s; }
.nav__links a:hover { color: var(--ink); }
.nav__links a[aria-current="page"] { color: var(--ink); }
.nav__right { display: flex; justify-content: flex-end; align-items: center; gap: 10px; }
.nav__menu { display: none; height: 40px; padding: 0 16px; border: 0; border-radius: 999px; background: var(--bg-2); font-size: 14px; cursor: pointer; }

/* Mobile menu sheet */
.sheet-menu { position: fixed; inset: 0; z-index: 49; display: grid; align-content: center; gap: 6px; padding: 90px var(--gutter) 40px; background: var(--bg); opacity: 0; pointer-events: none; transition: opacity 0.35s var(--out); }
.sheet-menu a { font-size: 44px; letter-spacing: -0.05em; line-height: 1.15; transform: translateY(16px); transition: transform 0.5s var(--out); }
.menu-open .sheet-menu { opacity: 1; pointer-events: auto; }
.menu-open .sheet-menu a { transform: none; }

/* ---------- Dot, the mascot (flat; all character is in the motion) ---------- */
.dot-mascot { display: inline-block; width: 80px; line-height: 0; }
.dot-svg { width: 100%; overflow: visible; }
.d-bounce { transform-origin: 60px 108px; animation: breathe 3.4s ease-in-out infinite; }
.d-shadow { transform-origin: 60px 113px; }
.d-eyes-open { transform-origin: 60px 56px; animation: blink 5s infinite; }
.d-pupils { transform: translate(var(--lx, 0px), var(--ly, 0px)); transition: transform 0.2s ease-out; }
.d-eyes-happy, .d-eyes-sad { opacity: 0; }
.d-eyes-open, .d-eyes-happy, .d-eyes-sad { transition: opacity 0.12s; }
.d-brow { transition: transform 0.35s var(--spring); transform-box: fill-box; transform-origin: center; }
.d-pencil { transition: transform 0.45s var(--spring); transform-box: fill-box; transform-origin: 50% 100%; }
[data-mood="happy"] .d-brow { transform: translateY(-4px); }
[data-mood="happy"] .d-pencil { transform: rotate(-12deg) translateY(-4px); }
[data-mood="sad"] .d-brow--l { transform: translateY(2px) rotate(-14deg); }
[data-mood="sad"] .d-brow--r { transform: translateY(2px) rotate(14deg); }
[data-mood="sad"] .d-pencil { transform: rotate(10deg); }
[data-mood="happy"] .d-bounce { animation: jump 0.7s var(--spring) 2; }
[data-mood="happy"] .d-shadow { animation: shadow 0.7s var(--spring) 2; }
[data-mood="happy"] .d-eyes-open, [data-mood="sad"] .d-eyes-open { opacity: 0; }
[data-mood="happy"] .d-eyes-happy, [data-mood="sad"] .d-eyes-sad { opacity: 1; }
[data-mood="sad"] .d-bounce { animation: none; transform: translateY(4px) scale(1.04, 0.94); transition: transform 0.4s var(--spring); }
@keyframes breathe { 50% { transform: scale(1.03, 0.97); } }
@keyframes blink { 0%, 93%, 100% { transform: scaleY(1); } 96% { transform: scaleY(0.1); } }
@keyframes jump { 0% { transform: scale(1.12, 0.86); } 40% { transform: translateY(-28px) scale(0.92, 1.08); } 75% { transform: scale(1.06, 0.94); } }
@keyframes shadow { 40% { transform: scale(0.55); opacity: 0.04; } }

/* ---------- Footer ---------- */
.footer { padding-top: 64px; border-top: 1px solid var(--hair); overflow: hidden; }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; font-size: 15px; }
.footer__grid h4 { margin: 0 0 12px; font-size: 13px; font-weight: 400; color: var(--ink-3); }
.footer__grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.footer__grid a:hover { text-decoration: underline; text-underline-offset: 3px; }
.footer__tag { max-width: 28ch; color: var(--ink-2); margin-top: 12px; }
.footer__word {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  margin: clamp(40px, 6vw, 80px) 0 0;
  padding-bottom: clamp(20px, 3vw, 40px);
  font-size: clamp(120px, 27vw, 420px);
  font-weight: 500;
  letter-spacing: -0.07em;
  line-height: 0.82;
  user-select: none;
}
.footer__word span { display: inline-block; transform: translateY(40%); opacity: 0; transition: transform 1s var(--out), opacity 1s var(--out); }
.footer__word span:nth-child(2) { transition-delay: 0.08s; }
.footer__word span:nth-child(3) { transition-delay: 0.16s; }
.footer__word .footer__dot { width: 0.17em; height: 0.17em; margin: 0 0 0.66em 0.02em; border-radius: 50%; background: var(--amber); transition-delay: 0.3s; align-self: flex-start; margin-top: 0.02em; }
.footer__word.is-in span { transform: none; opacity: 1; }
.footer__word.is-in .footer__dot { animation: dot-bounce 2.4s 1.2s var(--spring) infinite; }
@keyframes dot-bounce { 0%, 60%, 100% { transform: translateY(0); } 30% { transform: translateY(-0.25em); } }
.footer__fine { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding: 18px 0 28px; border-top: 1px solid var(--hair); font-size: 13px; color: var(--ink-3); }

/* ---------- Scroll reveals ---------- */
.blur-in { opacity: 0; filter: blur(14px); transform: translateY(14px); transition: opacity 1s var(--out), filter 1.1s var(--out), transform 1s var(--out); transition-delay: var(--d, 0s); }
.blur-in.is-in { opacity: 1; filter: none; transform: none; }
.rise { opacity: 0; transform: translateY(28px); transition: opacity 0.8s var(--out), transform 0.9s var(--out); transition-delay: var(--d, 0s); }
.rise.is-in { opacity: 1; transform: none; }

@media (max-width: 860px) {
  .nav { grid-template-columns: 1fr auto; }
  .nav__links { display: none; }
  .nav__menu { display: inline-flex; align-items: center; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__grid > :first-child { grid-column: 1 / -1; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition-duration: 0.01ms !important; }
  .blur-in, .rise, .footer__word span { opacity: 1; filter: none; transform: none; }
}
@media (max-width: 440px) {
  .nav__brand span { display: none; }
  .nav { padding-inline: 14px; }
}

/* ---------- Dot tricks + speech bubble ---------- */
.dot-mascot.is-pokeable { cursor: pointer; pointer-events: auto; -webkit-tap-highlight-color: transparent; }
.dot-mascot.is-pokeable:focus-visible { outline-offset: 6px; border-radius: 50%; }
.dot-svg { transform-origin: 50% 90%; }
.d-trick--spin { animation: d-spin 0.8s var(--spring); }
.d-trick--squish { animation: d-squish 0.7s var(--spring); }
.d-trick--wiggle { animation: d-wiggle 0.7s ease-in-out; }
@keyframes d-spin { 0% { transform: none; } 40% { transform: translateY(-30px) rotate(200deg); } 100% { transform: rotate(360deg); } }
@keyframes d-squish { 30% { transform: scale(1.3, 0.7); } 60% { transform: scale(0.85, 1.2) translateY(-10px); } }
@keyframes d-wiggle { 20% { transform: rotate(-14deg); } 40% { transform: rotate(12deg); } 60% { transform: rotate(-8deg); } 80% { transform: rotate(5deg); } }
.dot-bubble {
  position: fixed;
  z-index: 70;
  max-width: 240px;
  padding: 10px 14px;
  border-radius: 16px 16px 16px 4px;
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  line-height: 1.35;
  box-shadow: 0 14px 30px -12px rgba(0, 0, 0, 0.4);
  animation: bubble-in 0.4s var(--spring);
  transition: opacity 0.35s, transform 0.35s;
  pointer-events: none;
}
.dot-bubble.is-out { opacity: 0; transform: translateY(-6px); }
@keyframes bubble-in { from { opacity: 0; transform: translateY(8px) scale(0.9); } }

/* ---------- FX: sparks, split text, dot grid, tilt glare ---------- */
.spark { position: fixed; z-index: 80; width: 12px; height: 2.5px; margin: -1.25px 0 0; border-radius: 2px; background: var(--amber); transform-origin: 0 50%; pointer-events: none; }
.spark--big { width: 16px; height: 4px; }
.spark--big:nth-child(3n) { background: var(--ink); }
.spark--big:nth-child(3n + 1) { background: var(--green); }
[data-split].is-split { opacity: 1; filter: none; transform: none; }
[data-split] .sw { display: inline-block; white-space: nowrap; }
[data-split] .sl { display: inline-block; opacity: 0; transform: translateY(0.45em) rotate(4deg); filter: blur(6px); animation: letter-in 0.8s var(--out) forwards; animation-delay: calc(0.15s + var(--li) * 0.035s); }
@keyframes letter-in { to { opacity: 1; transform: none; filter: none; } }
.dotgrid { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
[data-tilt] { transition: transform 0.5s var(--out); will-change: transform; }
[data-tilt]:hover { transition-duration: 0.12s; }
[data-magnet] { transition: translate 0.35s var(--out), transform 0.25s var(--spring), background 0.2s; }

/* ---------- Page loader (only shows if the next page isn't ready yet) ---------- */
.page-loader { position: fixed; inset: 0; z-index: 90; display: grid; place-items: center; align-content: center; gap: 16px; background: rgba(255, 255, 255, 0.82); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); opacity: 0; pointer-events: none; transition: opacity 0.25s; }
.page-loader.is-on { opacity: 1; pointer-events: auto; }
.page-loader .dot-mascot { width: 72px; }
.page-loader .dot-svg { animation: d-spin 1s var(--spring) infinite; }
.page-loader__bar { width: 160px; height: 4px; border-radius: 99px; background: var(--bg-2); overflow: hidden; }
.page-loader__bar span { display: block; width: 40%; height: 100%; border-radius: inherit; background: var(--amber); animation: loader-slide 1s ease-in-out infinite; }
@keyframes loader-slide { from { transform: translateX(-100%); } to { transform: translateX(260%); } }