:root {
  --ink: #101426;
  --night: #070a14;
  --panel: #11172a;
  --panel-2: #171f37;
  --paper: #f4f6ed;
  --muted: #aab3c8;
  --lime: #c8ff52;
  --cyan: #54dcff;
  --violet: #a789ff;
  --coral: #ff7c62;
  --line: rgba(255,255,255,.12);
  --radius: 24px;
  --shadow: 0 24px 70px rgba(0,0,0,.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: #f7f8f3;
  background: var(--night);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(rgba(84,220,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(84,220,255,.04) 1px, transparent 1px),
    radial-gradient(circle at 12% 8%, rgba(167,137,255,.18), transparent 33%),
    radial-gradient(circle at 88% 35%, rgba(200,255,82,.09), transparent 28%);
  background-size: 42px 42px, 42px 42px, auto, auto;
}
a { color: inherit; }
img { max-width: 100%; }
button, input { font: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 99; background: var(--lime); color: var(--ink); padding: .7rem 1rem; border-radius: 10px; }
.skip-link:focus { top: 1rem; }
.shell { width: min(1160px, calc(100% - 2rem)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(7,10,20,.82);
  backdrop-filter: blur(18px);
}
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 1.4rem; }
.brand { display: inline-flex; align-items: center; gap: .7rem; font-size: 1.2rem; font-weight: 850; text-decoration: none; letter-spacing: -.03em; }
.brand-mark { position: relative; width: 34px; aspect-ratio: 1; border: 2px solid var(--lime); border-radius: 9px 50% 9px 50%; transform: rotate(45deg); box-shadow: 0 0 24px rgba(200,255,82,.28); }
.brand-mark::after { content: ""; position: absolute; inset: 9px; border-radius: 50%; background: var(--cyan); }
.nav-links { display: flex; align-items: center; gap: 1.1rem; }
.nav-links a { color: #dce2ef; text-decoration: none; font-size: .94rem; }
.nav-links a:hover { color: var(--lime); }
.nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: .55rem; min-height: 46px; padding: .72rem 1.15rem; border-radius: 999px; border: 1px solid transparent; background: var(--lime); color: var(--ink) !important; font-weight: 800; text-decoration: none; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.nav-cta:hover, .button:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(200,255,82,.18); }
.button.secondary { background: transparent; color: #fff !important; border-color: var(--line); }
.button.secondary:hover { border-color: var(--cyan); }

.hero { min-height: 760px; display: grid; align-items: center; padding: 6rem 0 5rem; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.03fr .97fr; align-items: center; gap: clamp(3rem, 7vw, 7rem); }
.eyebrow { display: flex; align-items: center; gap: .7rem; color: var(--lime); font-size: .77rem; font-weight: 850; letter-spacing: .15em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 30px; height: 2px; background: currentColor; }
h1, h2, h3 { margin: 0; font-family: Georgia, "Times New Roman", serif; line-height: 1.04; letter-spacing: -.035em; }
h1 { margin-top: 1rem; font-size: clamp(3.6rem, 8vw, 7.4rem); max-width: 850px; }
h2 { font-size: clamp(2.35rem, 5vw, 4.6rem); }
h3 { font-size: clamp(1.35rem, 2.2vw, 2rem); }
.gradient-word { color: var(--cyan); font-style: italic; }
.lead { max-width: 690px; margin: 1.5rem 0 0; color: #cbd2df; font-size: clamp(1.05rem, 2vw, 1.3rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.microcopy { margin: 1rem 0 0; color: var(--muted); font-size: .84rem; }
.orbit { position: relative; width: min(450px, 82vw); aspect-ratio: 1; margin-inline: auto; display: grid; place-items: center; }
.orbit::before, .orbit::after { content: ""; position: absolute; border: 1px solid rgba(84,220,255,.36); border-radius: 50%; animation: spin 22s linear infinite; }
.orbit::before { inset: 3%; border-style: dashed; }
.orbit::after { inset: 19%; animation-direction: reverse; animation-duration: 13s; border-color: rgba(200,255,82,.35); }
.brain-core { width: 48%; aspect-ratio: 1; border-radius: 38% 62% 46% 54%; display: grid; place-items: center; background: linear-gradient(145deg, var(--violet), #5b3fb2); box-shadow: 0 0 80px rgba(167,137,255,.32); animation: morph 8s ease-in-out infinite; }
.brain-core span { font-family: Georgia, serif; font-size: clamp(3rem, 8vw, 6.5rem); font-style: italic; }
.node { position: absolute; width: 72px; aspect-ratio: 1; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: rgba(17,23,42,.92); font-weight: 850; color: var(--cyan); box-shadow: var(--shadow); animation: float 5s ease-in-out infinite; }
.node.n1 { top: 4%; left: 18%; }
.node.n2 { right: 0; top: 42%; animation-delay: -1.6s; color: var(--lime); }
.node.n3 { bottom: 2%; left: 25%; animation-delay: -3s; color: var(--coral); }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes morph { 0%,100% { border-radius: 38% 62% 46% 54%; transform: rotate(-2deg); } 50% { border-radius: 58% 42% 61% 39%; transform: rotate(3deg); } }
@keyframes float { 50% { transform: translateY(-14px) rotate(4deg); } }

.signal-strip { border-block: 1px solid var(--line); background: rgba(255,255,255,.025); }
.signals { min-height: 92px; display: grid; grid-template-columns: repeat(4, 1fr); align-items: center; }
.signal { padding: .8rem 1.4rem; border-right: 1px solid var(--line); }
.signal:last-child { border: 0; }
.signal strong { display: block; color: var(--lime); font-size: 1.35rem; line-height: 1.1; }
.signal span { color: var(--muted); font-size: .82rem; }

.section { padding: clamp(5rem, 10vw, 9rem) 0; }
.section.light { color: var(--ink); background: var(--paper); }
.section-head { display: grid; grid-template-columns: .9fr 1.1fr; gap: 3rem; align-items: end; margin-bottom: 3rem; }
.section-head p { margin: 0; color: inherit; opacity: .73; font-size: 1.08rem; }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.card { min-height: 270px; padding: 1.55rem; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,255,255,.045); transition: transform .25s ease, border-color .25s ease; }
.card:hover { transform: translateY(-8px); border-color: var(--cyan); }
.card-number { font-size: .75rem; color: var(--lime); letter-spacing: .13em; text-transform: uppercase; }
.card h3 { margin-top: 3.2rem; }
.card p { color: var(--muted); margin-bottom: 0; }
.light .card { background: #fff; border-color: rgba(16,20,38,.11); box-shadow: 0 15px 45px rgba(20,20,20,.06); }
.light .card p { color: #5a6070; }

.method { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.method-copy { padding: clamp(2rem, 5vw, 4rem); border-radius: 32px; background: var(--ink); }
.method-copy p { color: #c9d0df; }
.method-list { list-style: none; margin: 2rem 0 0; padding: 0; }
.method-list li { display: grid; grid-template-columns: 46px 1fr; gap: 1rem; align-items: start; padding: 1.15rem 0; border-top: 1px solid var(--line); }
.method-list b { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; background: var(--lime); color: var(--ink); }
.method-visual { min-height: 580px; padding: 2rem; border-radius: 32px; background: linear-gradient(145deg, #dfe5d4, #fff); display: grid; place-items: center; overflow: hidden; }
.matrix { display: grid; grid-template-columns: repeat(3, 92px); gap: 14px; transform: rotate(-6deg); }
.matrix span { aspect-ratio: 1; display: grid; place-items: center; border-radius: 20px; background: var(--ink); color: var(--cyan); font-size: 2rem; box-shadow: 12px 15px 0 var(--violet); }
.matrix span:nth-child(2n) { background: var(--lime); color: var(--ink); box-shadow-color: var(--coral); }

.faq { max-width: 880px; margin-inline: auto; }
.text-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.text-grid article { padding-top: 1.5rem; border-top: 2px solid var(--cyan); }
.text-grid article:nth-child(2) { border-color: var(--lime); }
.text-grid article:nth-child(3) { border-color: var(--violet); }
.text-grid h3 { margin-bottom: 1rem; }
.text-grid p { color: var(--muted); }
.faq details { padding: 1.2rem 0; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 800; font-size: 1.08rem; }
.faq p { color: var(--muted); }
.notice { padding: 1.3rem 1.5rem; border: 1px solid rgba(255,124,98,.45); border-radius: 18px; background: rgba(255,124,98,.08); color: #ffd8d0; }
.notice.spaced { margin-top: 1.5rem; }
.compact-heading { font-size: 2.2rem; }

/* Test */
.test-page { min-height: 100vh; }
.test-wrap { width: min(920px, calc(100% - 2rem)); margin: 0 auto; padding: 3rem 0 7rem; }
.test-top { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 1.4rem; }
.timer { display: inline-flex; align-items: center; gap: .55rem; padding: .65rem .9rem; border-radius: 999px; background: var(--panel-2); color: var(--lime); font-weight: 850; font-variant-numeric: tabular-nums; }
.progress-track { height: 7px; border-radius: 99px; background: rgba(255,255,255,.09); overflow: hidden; }
.progress-bar { height: 100%; width: 5%; background: linear-gradient(90deg, var(--cyan), var(--lime)); transition: width .3s ease; }
.test-card { margin-top: 1.4rem; min-height: 570px; padding: clamp(1.5rem, 5vw, 3.5rem); border: 1px solid var(--line); border-radius: 30px; background: rgba(17,23,42,.94); box-shadow: var(--shadow); }
.question-meta { color: var(--cyan); text-transform: uppercase; font-size: .76rem; letter-spacing: .13em; font-weight: 850; }
.question-title { margin-top: 1rem; font-size: clamp(1.7rem, 4vw, 3rem); }
.question-visual { min-height: 120px; margin: 1.8rem 0; display: grid; place-items: center; padding: 1.5rem; border-radius: 18px; background: #0b0f1d; }
.sequence { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: .8rem; font-family: Georgia, serif; font-size: clamp(1.5rem, 5vw, 3.1rem); }
.sequence i { color: var(--muted); font-style: normal; }
.shape-row { display: flex; align-items: center; justify-content: center; gap: 1.15rem; }
.visual-sequence { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: .75rem; }
.visual-sequence .glyph,
.matrix-cell { width: clamp(58px, 10vw, 86px); aspect-ratio: 1; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.13); border-radius: 15px; background: #151c31; color: var(--cyan); font-size: clamp(2rem, 6vw, 3.7rem); line-height: 1; }
.visual-sequence .glyph:nth-child(3n+2) { color: var(--lime); }
.visual-sequence .gap { color: #69738b; font-size: 1.4rem; }
.matrix-visual { display: grid; grid-template-columns: repeat(3, clamp(58px, 10vw, 86px)); gap: .55rem; }
.matrix-cell:nth-child(2n) { color: var(--lime); }
.matrix-cell.blank { border-style: dashed; color: var(--coral); background: rgba(255,124,98,.06); }
.matrix-cell.combine { font-size: clamp(1.35rem, 4vw, 2.4rem); }
.shape { width: 55px; aspect-ratio: 1; border: 3px solid var(--cyan); border-radius: 50%; }
.shape.square { border-radius: 8px; border-color: var(--lime); }
.shape.triangle { border-radius: 0; clip-path: polygon(50% 0,100% 100%,0 100%); }
.shape.cube { box-shadow: inset 0 0 0 11px #11172a; }
.arrow { font-size: 3rem; color: var(--violet); }
.options { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.option { min-height: 62px; padding: .9rem 1rem; border: 1px solid var(--line); border-radius: 15px; background: rgba(255,255,255,.035); color: #fff; text-align: left; transition: background .2s ease, border-color .2s ease, transform .2s ease; }
.option:hover { transform: translateY(-2px); border-color: var(--cyan); }
.option.selected { background: rgba(200,255,82,.13); border-color: var(--lime); }
.option.symbol-option { text-align: center; font-size: 2rem; line-height: 1; }
.test-nav { display: flex; justify-content: space-between; gap: .8rem; margin-top: 1.5rem; }
.test-nav button { min-height: 48px; padding: .75rem 1.15rem; border-radius: 999px; border: 1px solid var(--line); color: #fff; background: transparent; font-weight: 800; }
.test-nav .next { background: var(--lime); color: var(--ink); border-color: var(--lime); }
.result { display: none; }
.result.visible { display: block; }
.score-orb { width: 180px; aspect-ratio: 1; margin: 1.5rem auto; display: grid; place-items: center; border-radius: 50%; background: radial-gradient(circle, var(--panel) 55%, transparent 56%), conic-gradient(var(--lime) var(--score-angle, 0deg), rgba(255,255,255,.1) 0); }
.score-orb strong { font-family: Georgia, serif; font-size: 3.2rem; }
.breakdown { display: grid; grid-template-columns: repeat(4, 1fr); gap: .7rem; margin-top: 2rem; }
.breakdown div { padding: 1rem; border-radius: 14px; background: rgba(255,255,255,.05); text-align: center; }
.breakdown strong { display: block; color: var(--cyan); font-size: 1.4rem; }
.review { margin-top: 2rem; }
.review details { padding: 1rem 0; border-top: 1px solid var(--line); }
.correct { color: var(--lime); }
.wrong { color: var(--coral); }

/* Games */
.game-hero { padding: 5rem 0 2.5rem; text-align: center; }
.game-hero .lead { margin-inline: auto; }
.game-shell { width: min(850px, calc(100% - 2rem)); margin: 0 auto 7rem; padding: clamp(1.2rem, 4vw, 2.5rem); border: 1px solid var(--line); border-radius: 28px; background: rgba(17,23,42,.94); box-shadow: var(--shadow); }
.game-stats { display: flex; justify-content: center; flex-wrap: wrap; gap: .75rem; margin-bottom: 1.5rem; }
.stat-pill { padding: .55rem .9rem; border-radius: 999px; background: #0b0f1d; color: var(--cyan); font-weight: 800; }
.memory-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .7rem; }
.memory-card { aspect-ratio: 1; border: 1px solid var(--line); border-radius: 15px; background: linear-gradient(145deg, #232e4c, #11172a); color: transparent; font-size: clamp(1.6rem, 6vw, 3rem); transition: transform .35s ease, background .2s ease; }
.memory-card.revealed, .memory-card.matched { color: #fff; transform: rotateY(180deg); background: var(--violet); }
.memory-card.matched { background: #365d48; }
.game-question { text-align: center; }
.game-question h2 { font-size: clamp(2rem, 5vw, 3.4rem); }
.game-options { display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; margin-top: 1.5rem; }
.game-option { min-height: 58px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.05); color: #fff; }
.game-option:hover { border-color: var(--lime); }
.game-option.correct-answer { border-color: var(--lime); }
.feedback { min-height: 28px; margin: 1rem 0 0; color: var(--lime); text-align: center; font-weight: 800; }

.site-footer { padding: 4rem 0 2rem; border-top: 1px solid var(--line); background: #05070f; }
.footer-top { display: grid; grid-template-columns: .75fr 1.25fr; gap: 4rem; }
.footer-intro p { color: var(--muted); max-width: 390px; }
.brain-footer { border: 1px solid var(--line); border-radius: 20px; background: rgba(255,255,255,.03); }
.brain-footer summary { padding: 1.1rem 1.3rem; cursor: pointer; font-weight: 850; color: var(--lime); }
.brain-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: .65rem; padding: 0 1rem 1rem; }
.brain-links a { min-height: 110px; padding: 1rem; border: 1px solid var(--line); border-radius: 14px; text-decoration: none; background: rgba(255,255,255,.025); }
.brain-links a:hover { border-color: var(--cyan); }
.brain-links strong { display: block; color: #fff; }
.brain-links span { color: var(--muted); font-size: .82rem; }
.footer-bottom { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); color: #7f889d; font-size: .82rem; }

@media (max-width: 900px) {
  .hero-grid, .section-head, .method, .footer-top, .text-grid { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr 1fr; }
  .orbit { width: min(380px, 80vw); }
  .hero { min-height: auto; }
  .signals { grid-template-columns: 1fr 1fr; }
  .signal:nth-child(2) { border-right: 0; }
  .signal:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}
@media (max-width: 640px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .hero { padding-top: 4rem; }
  h1 { font-size: clamp(3.3rem, 18vw, 5rem); }
  .cards, .options, .game-options, .breakdown, .brain-links { grid-template-columns: 1fr; }
  .matrix { grid-template-columns: repeat(3, 68px); }
  .method-visual { min-height: 420px; }
  .test-card { min-height: 620px; }
  .memory-grid { gap: .45rem; }
  .footer-bottom { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}