/* ============ DESIGN SYSTEM ============ */
:root{
  --bg:#0a0b0d;
  --bg-soft:#101113;
  --surface:#15171a;
  --surface-2:#1c1f23;
  --border:#26292e;
  --border-soft:#1e2125;
  --text:#f2f0ea;
  --text-dim:#9a9ea6;
  --text-mute:#5c6068;
  --accent:#d4ff3a;
  --accent-dim:#9bbf1f;
  --accent-soft:rgba(212,255,58,.12);
  --danger:#ff5a4d;
  --danger-soft:rgba(255,90,77,.14);
  --good:#5ce08a;
  --font-display:'Fraunces',Georgia,serif;
  --font-body:'DM Sans',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,monospace;
  --radius:16px;
  --radius-sm:10px;
  --ease:cubic-bezier(.22,1,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--text);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  min-height:100vh;
  position:relative;
}
/* atmospheric background */
body::before{
  content:"";
  position:fixed;inset:0;
  background:
    radial-gradient(900px 600px at 12% -8%,rgba(212,255,58,.07),transparent 60%),
    radial-gradient(700px 500px at 88% 108%,rgba(212,255,58,.05),transparent 60%),
    radial-gradient(500px 400px at 50% 50%,rgba(255,255,255,.015),transparent 70%);
  pointer-events:none;z-index:0;
}
body::after{
  content:"";position:fixed;inset:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 .035 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  pointer-events:none;z-index:1;opacity:.6;mix-blend-mode:overlay;
}
#app{position:relative;z-index:2;min-height:100vh;display:flex;flex-direction:column}

/* ============ HEADER ============ */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:22px 40px;border-bottom:1px solid var(--border-soft);
  position:sticky;top:0;z-index:50;
  background:rgba(10,11,13,.72);backdrop-filter:blur(18px);
}
.brand{display:flex;align-items:center;gap:12px;cursor:pointer;user-select:none}
.brand-mark{
  width:34px;height:34px;border-radius:9px;
  background:var(--accent);
  display:grid;place-items:center;
  color:#0a0b0d;font-family:var(--font-display);font-weight:900;font-size:20px;
  box-shadow:0 0 24px rgba(212,255,58,.35);
  transition:transform .4s var(--ease);
}
.brand:hover .brand-mark{transform:rotate(-8deg) scale(1.06)}
.brand-name{font-family:var(--font-display);font-weight:600;font-size:19px;letter-spacing:-.01em}
.brand-name span{color:var(--text-dim);font-weight:300}
.lang-toggle{
  display:flex;align-items:center;gap:2px;
  background:var(--surface);border:1px solid var(--border);
  border-radius:999px;padding:4px;
}
.lang-toggle button{
  border:none;background:transparent;color:var(--text-dim);
  font-family:var(--font-body);font-weight:600;font-size:13px;
  padding:6px 14px;border-radius:999px;cursor:pointer;
  transition:all .25s var(--ease);
}
.lang-toggle button.active{background:var(--accent);color:#0a0b0d}

/* topbar actions group */
.topbar-actions{display:flex;align-items:center;gap:12px}
.docs-btn{
  display:flex;align-items:center;gap:7px;
  background:var(--surface);border:1px solid var(--border);
  color:var(--text-dim);
  padding:7px 15px;border-radius:999px;cursor:pointer;
  font-family:var(--font-body);font-weight:600;font-size:13px;
  transition:all .25s var(--ease);
}
.docs-btn:hover{color:var(--text);border-color:var(--text-mute);transform:translateY(-1px)}
.docs-btn svg{width:14px;height:14px}

/* ============ HOME VIEW ============ */
.home{flex:1;display:flex;flex-direction:column}
.hero{
  padding:90px 40px 60px;max-width:1280px;width:100%;margin:0 auto;
}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin-bottom:28px;
}
.hero-eyebrow::before{content:"";width:24px;height:1px;background:var(--accent)}
.hero h1{
  font-family:var(--font-display);font-weight:300;
  font-size:clamp(44px,7vw,92px);line-height:.98;letter-spacing:-.03em;
  max-width:14ch;
}
.hero h1 em{font-style:italic;font-weight:400;color:var(--accent)}
.hero p{
  margin-top:28px;font-size:19px;color:var(--text-dim);
  max-width:48ch;line-height:1.6;
}
.hero-stats{
  display:flex;gap:48px;margin-top:52px;padding-top:32px;
  border-top:1px solid var(--border-soft);
}
.stat .num{font-family:var(--font-mono);font-size:28px;font-weight:500;color:var(--text)}
.stat .lbl{font-size:12px;color:var(--text-mute);text-transform:uppercase;letter-spacing:.12em;margin-top:4px}

.cards-section{max-width:1280px;width:100%;margin:0 auto;padding:20px 40px 100px}
.section-label{
  display:flex;align-items:baseline;justify-content:space-between;
  margin-bottom:28px;
}
.section-label h2{font-family:var(--font-display);font-weight:500;font-size:24px;letter-spacing:-.01em}
.section-label span{font-size:13px;color:var(--text-mute);font-family:var(--font-mono)}

.grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}
.card{
  position:relative;background:var(--surface);
  border:1px solid var(--border-soft);border-radius:var(--radius);
  padding:28px 24px 24px;cursor:pointer;overflow:hidden;
  min-height:200px;display:flex;flex-direction:column;justify-content:space-between;
  transition:transform .5s var(--ease),border-color .4s,background .4s;
  opacity:0;transform:translateY(18px);
  animation:reveal .7s var(--ease) forwards;
}
@keyframes reveal{to{opacity:1;transform:none}}
.card:nth-child(1){animation-delay:.05s}
.card:nth-child(2){animation-delay:.1s}
.card:nth-child(3){animation-delay:.15s}
.card:nth-child(4){animation-delay:.2s}
.card:nth-child(5){animation-delay:.25s}
.card:nth-child(6){animation-delay:.3s}
.card:nth-child(7){animation-delay:.35s}
.card:nth-child(8){animation-delay:.4s}
.card::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(400px 200px at 50% -40%,var(--accent-soft),transparent 70%);
  opacity:0;transition:opacity .5s var(--ease);
}
.card:hover{transform:translateY(-5px);border-color:var(--border);background:var(--surface-2)}
.card:hover::before{opacity:1}
.card-icon{
  width:42px;height:42px;border-radius:11px;
  background:var(--bg-soft);border:1px solid var(--border);
  display:grid;place-items:center;margin-bottom:auto;
  color:var(--accent);transition:all .4s var(--ease);
}
.card:hover .card-icon{background:var(--accent);color:#0a0b0d;border-color:var(--accent);transform:scale(1.06)}
.card-icon svg{width:20px;height:20px}
.card-title{font-family:var(--font-display);font-weight:500;font-size:21px;letter-spacing:-.01em;margin-top:18px}
.card-desc{font-size:13.5px;color:var(--text-dim);margin-top:6px;line-height:1.45}
.card-score{
  margin-top:14px;display:flex;align-items:center;justify-content:space-between;
  font-family:var(--font-mono);font-size:12px;color:var(--text-mute);
  padding-top:14px;border-top:1px solid var(--border-soft);
}
.card-score b{color:var(--accent);font-weight:500}

/* ============ TEST VIEW ============ */
.test-view{flex:1;display:none;flex-direction:column}
.test-view.active{display:flex;animation:fadeUp .5s var(--ease)}
@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.test-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:26px 40px;border-bottom:1px solid var(--border-soft);
  max-width:1280px;width:100%;margin:0 auto;
}
.back-btn{
  display:flex;align-items:center;gap:8px;
  background:none;border:1px solid var(--border);color:var(--text-dim);
  padding:9px 16px;border-radius:999px;cursor:pointer;
  font-family:var(--font-body);font-size:13px;font-weight:500;
  transition:all .3s var(--ease);
}
.back-btn:hover{color:var(--text);border-color:var(--text-mute);transform:translateX(-3px)}
.test-header h2{font-family:var(--font-display);font-weight:500;font-size:22px;letter-spacing:-.01em}
.test-best{
  font-family:var(--font-mono);font-size:13px;color:var(--text-dim);
  padding:8px 14px;border:1px solid var(--border);border-radius:999px;
}
.test-best b{color:var(--accent);font-weight:500}

.test-body{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:40px;max-width:1280px;width:100%;margin:0 auto;
}

/* generic big button */
.big-btn{
  font-family:var(--font-display);font-weight:400;font-size:clamp(22px,3vw,34px);
  background:none;border:none;color:var(--text);cursor:pointer;
  padding:18px 48px;border-radius:999px;letter-spacing:-.01em;
  border:1.5px solid var(--accent);color:var(--accent);
  transition:all .35s var(--ease);
}
.big-btn:hover{background:var(--accent);color:#0a0b0d;transform:scale(1.04)}
.ghost-btn{
  font-family:var(--font-body);font-size:14px;font-weight:500;
  background:var(--surface);border:1px solid var(--border);color:var(--text-dim);
  padding:10px 22px;border-radius:999px;cursor:pointer;transition:all .3s var(--ease);
}
.ghost-btn:hover{color:var(--text);border-color:var(--text-mute)}

.prompt-text{
  font-family:var(--font-display);font-weight:300;font-style:italic;
  font-size:clamp(20px,2.4vw,30px);color:var(--text-dim);text-align:center;
  margin-bottom:36px;max-width:30ch;
}
.score-display{
  font-family:var(--font-mono);font-size:clamp(56px,9vw,110px);font-weight:500;
  color:var(--accent);letter-spacing:-.04em;line-height:1;
}
.score-label{font-size:14px;color:var(--text-mute);text-transform:uppercase;letter-spacing:.16em;margin-top:14px}
.percentile{font-size:14px;color:var(--text-dim);margin-top:22px;font-family:var(--font-mono)}
.percentile b{color:var(--text)}

/* ============ REACTION TIME ============ */
#rt-zone{
  width:min(680px,86vw);height:min(420px,56vh);border-radius:var(--radius);
  display:grid;place-items:center;cursor:pointer;text-align:center;padding:30px;
  border:1px solid var(--border);background:var(--surface);
  transition:background .15s ease, border-color .15s;
  user-select:none;
}
#rt-zone.state-wait{background:#3a1414;border-color:#5a1f1f}
#rt-zone.state-go{background:#1a3a1a;border-color:#2a5a2a}
#rt-zone.state-early{background:#3a1414;border-color:#5a1f1f}
#rt-zone h3{font-family:var(--font-display);font-weight:400;font-size:clamp(26px,4vw,46px);letter-spacing:-.02em}
#rt-zone p{margin-top:12px;color:var(--text-dim);font-size:15px}

/* ============ SEQUENCE MEMORY ============ */
.seq-wrap{display:flex;flex-direction:column;align-items:center;gap:28px}
.seq-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;width:min(420px,80vw)}
.seq-tile{
  aspect-ratio:1;border-radius:14px;cursor:pointer;
  background:var(--surface-2);border:1px solid var(--border);
  transition:all .15s var(--ease);
}
.seq-tile.flash{background:var(--accent);border-color:var(--accent);box-shadow:0 0 30px rgba(212,255,58,.5);transform:scale(.96)}
.seq-tile.lit{background:var(--accent);border-color:var(--accent);box-shadow:0 0 26px rgba(212,255,58,.45);transform:scale(.92)}
.seq-tile:hover{border-color:var(--text-mute)}
.level-pill{font-family:var(--font-mono);font-size:15px;color:var(--text-dim);padding:8px 18px;border:1px solid var(--border);border-radius:999px}
.level-pill b{color:var(--accent)}

/* ============ AIM TRAINER ============ */
.aim-arena{
  position:relative;width:min(760px,92vw);height:min(480px,60vh);
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;cursor:crosshair;
}
.aim-target{
  position:absolute;width:62px;height:62px;border-radius:50%;
  background:var(--accent);transform:translate(-50%,-50%);
  box-shadow:0 0 30px rgba(212,255,58,.35);cursor:pointer;
  animation:targetIn .25s var(--ease);
}
@keyframes targetIn{from{transform:translate(-50%,-50%) scale(0)}to{transform:translate(-50%,-50%) scale(1)}}
.aim-hud{display:flex;gap:40px;margin-bottom:24px}
.aim-hud .num{font-family:var(--font-mono);font-size:22px;color:var(--accent)}
.aim-hud .lbl{font-size:12px;color:var(--text-mute);text-transform:uppercase;letter-spacing:.1em}

/* ============ NUMBER MEMORY ============ */
.nm-card{
  width:min(560px,88vw);min-height:280px;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:40px;text-align:center;
}
.nm-number{font-family:var(--font-mono);font-size:clamp(40px,7vw,72px);font-weight:500;color:var(--accent);letter-spacing:.04em}
.nm-input{
  font-family:var(--font-mono);font-size:28px;text-align:center;
  background:var(--bg-soft);border:1px solid var(--border);border-radius:12px;
  color:var(--text);padding:14px 20px;width:100%;max-width:340px;outline:none;
  transition:border-color .3s;
}
.nm-input:focus{border-color:var(--accent)}

/* ============ VERBAL MEMORY ============ */
.vm-word{font-family:var(--font-display);font-weight:400;font-size:clamp(40px,6vw,68px);letter-spacing:-.02em;margin-bottom:48px}
.vm-btns{display:flex;gap:20px}
.vm-btn{
  font-family:var(--font-body);font-size:17px;font-weight:600;
  padding:16px 40px;border-radius:14px;cursor:pointer;
  border:1px solid var(--border);background:var(--surface);color:var(--text);
  transition:all .3s var(--ease);min-width:160px;
}
.vm-btn:hover{transform:translateY(-2px);border-color:var(--text-mute)}
.vm-btn.seen:hover{background:var(--danger-soft);border-color:var(--danger);color:var(--danger)}
.vm-btn.new:hover{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.vm-lives{display:flex;gap:8px}
.vm-life{width:14px;height:14px;border-radius:50%;background:var(--danger);transition:all .4s}
.vm-life.lost{background:var(--border);transform:scale(.7)}

/* ============ CHIMP TEST ============ */
.ct-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:12px;width:min(560px,90vw)}
.ct-tile{
  aspect-ratio:1;border-radius:12px;cursor:pointer;
  background:var(--surface-2);border:1px solid var(--border);
  display:grid;place-items:center;font-family:var(--font-mono);font-size:26px;font-weight:500;
  transition:all .2s var(--ease);
}
.ct-tile.show{background:var(--accent-soft);border-color:var(--accent-dim);color:var(--accent)}
.ct-tile.blank{background:var(--surface);color:transparent;cursor:pointer}
.ct-tile.blank:hover{border-color:var(--text-mute)}
.ct-tile.done{background:var(--accent-soft);border-color:var(--accent-dim);color:var(--accent-dim);opacity:.4;pointer-events:none}

/* ============ VISUAL MEMORY ============ */
.vm-grid{display:grid;gap:8px}
.vm-cell{
  width:min(70px,12vw);aspect-ratio:1;border-radius:9px;cursor:pointer;
  background:var(--surface-2);border:1px solid var(--border);
  transition:all .15s var(--ease);
}
.vm-cell.flash{background:var(--accent);border-color:var(--accent);box-shadow:0 0 18px rgba(212,255,58,.4)}
.vm-cell.correct{background:var(--accent-soft);border-color:var(--accent-dim)}
.vm-cell.wrong{background:var(--danger-soft);border-color:var(--danger)}
.vm-cell:hover{border-color:var(--text-mute)}

/* ============ TYPING ============ */
.typ-card{width:min(760px,92vw);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:40px}
.typ-text{font-family:var(--font-display);font-weight:400;font-size:clamp(20px,2.4vw,28px);line-height:1.7;letter-spacing:-.005em;color:var(--text-mute);white-space:pre-wrap;word-break:break-word}
.typ-text .correct{color:var(--text)}
.typ-text .wrong{color:var(--danger);background:var(--danger-soft);border-radius:3px}
.typ-text .cursor{border-left:2px solid var(--accent);animation:blink 1s steps(1) infinite;margin-left:-1px}
@keyframes blink{50%{opacity:0}}
.typ-input{
  position:absolute;left:-9999px;opacity:0;
}
.typ-meta{display:flex;justify-content:space-between;margin-top:28px;font-family:var(--font-mono);font-size:14px;color:var(--text-mute)}

/* ============ DOCS VIEW ============ */
.docs-view{flex:1;display:none;flex-direction:column}
.docs-view.active{display:flex;animation:fadeUp .5s var(--ease)}
.docs-header{
  display:flex;align-items:center;gap:20px;
  padding:26px 40px;border-bottom:1px solid var(--border-soft);
  max-width:1280px;width:100%;margin:0 auto;
}
.docs-header h2{font-family:var(--font-display);font-weight:500;font-size:22px;letter-spacing:-.01em}
.docs-spacer{flex:1}
.docs-intro{
  max-width:1280px;width:100%;margin:0 auto;padding:32px 40px 8px;
}
.docs-intro p{font-size:16px;color:var(--text-dim);max-width:70ch;line-height:1.65}
.docs-body{
  max-width:1280px;width:100%;margin:0 auto;padding:16px 40px 90px;
  display:grid;grid-template-columns:repeat(2,1fr);gap:22px;
}
.doc-card{
  background:var(--surface);border:1px solid var(--border-soft);
  border-radius:var(--radius);padding:30px;
  display:flex;flex-direction:column;
  transition:border-color .4s,background .4s,transform .4s var(--ease);
}
.doc-card:hover{border-color:var(--border);background:var(--surface-2);transform:translateY(-3px)}
.doc-card-head{display:flex;gap:18px;margin-bottom:24px}
.doc-icon{
  width:44px;height:44px;border-radius:11px;flex-shrink:0;
  background:var(--bg-soft);border:1px solid var(--border);
  display:grid;place-items:center;color:var(--accent);
}
.doc-icon svg{width:20px;height:20px}
.doc-index{font-family:var(--font-mono);font-size:12px;color:var(--text-mute);letter-spacing:.1em}
.doc-card-head h3{font-family:var(--font-display);font-weight:500;font-size:22px;letter-spacing:-.01em;margin-top:2px}
.doc-tagline{font-size:13.5px;color:var(--text-dim);margin-top:4px}
.doc-section{margin-bottom:20px}
.doc-section:last-of-type{margin-bottom:0}
.doc-section h4{
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  text-transform:uppercase;letter-spacing:.14em;color:var(--accent);
  margin-bottom:8px;
}
.doc-section p{font-size:14.5px;color:var(--text-dim);line-height:1.65}
.doc-section ol{padding-left:20px;display:flex;flex-direction:column;gap:7px}
.doc-section ol li{font-size:14.5px;color:var(--text-dim);line-height:1.55;padding-left:4px}
.doc-section ol li::marker{color:var(--accent)}
.doc-meta{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:24px}
.doc-try{
  margin-top:auto;align-self:flex-start;
  display:flex;align-items:center;gap:8px;
  border-color:var(--accent-dim);color:var(--accent);
}
.doc-try:hover{background:var(--accent-soft);color:var(--accent)}

/* ============ FOOTER ============ */
.footer{
  padding:32px 40px;border-top:1px solid var(--border-soft);
  display:flex;justify-content:space-between;align-items:center;
  max-width:1280px;width:100%;margin:0 auto;
  font-size:13px;color:var(--text-mute);
}
.footer a{color:var(--text-dim);text-decoration:none;transition:color .3s}
.footer a:hover{color:var(--accent)}
.footer-bottom{display:inline-flex;align-items:center}

/* ============ TOAST ============ */
.toast{
  position:fixed;bottom:32px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--surface-2);border:1px solid var(--border);
  padding:14px 24px;border-radius:999px;font-size:14px;color:var(--text);
  opacity:0;pointer-events:none;z-index:200;transition:all .4s var(--ease);
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ============ RESPONSIVE ============ */
@media(max-width:1000px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .docs-body{grid-template-columns:1fr}
  .doc-meta{grid-template-columns:1fr;gap:16px}
}
@media(max-width:680px){
  .topbar{padding:18px 22px}
  .hero{padding:60px 22px 40px}
  .cards-section{padding:10px 22px 70px}
  .hero-stats{gap:28px;flex-wrap:wrap}
  .test-header{padding:20px 22px}
  .test-body{padding:24px 22px}
  .footer{padding:24px 22px;flex-direction:column;gap:12px;text-align:center}
  .grid{grid-template-columns:1fr}
  .ct-grid{grid-template-columns:repeat(5,1fr)}
  .docs-header{padding:20px 22px}
  .docs-intro{padding:24px 22px 8px}
  .docs-body{padding:12px 22px 70px}
  .doc-card{padding:24px}
  .docs-btn span{display:none}
  .docs-btn{padding:8px}
}