/* Layout: una sola tarjeta centrada tipo invitación; cada prueba sustituye a la anterior, con un sello de progreso arriba */
:root{
  --bg:#E9ECE6; --card:#FBFBF8; --ink:#1F2A44; --muted:#5E6676; --line:#D3D8CF;
  --accent:#A8D5B5; --accent-ink:#3E7556; --on-accent:#1F3A2B; --accent-soft:#E6F2EA; --ok:#2F6B4F; --bad:#A2412F;
  --display:"Young Serif", Georgia, "Times New Roman", serif;
  --body:"Figtree", system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#151A22; --card:#1E2430; --ink:#ECEEF2; --muted:#A3AAB8; --line:#323A49;
  --accent:#9CCFAE; --accent-ink:#A8D9B8; --on-accent:#14241B; --accent-soft:#24352C; --ok:#7CC6A0; --bad:#F09A86; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#151A22; --card:#1E2430; --ink:#ECEEF2; --muted:#A3AAB8; --line:#323A49;
  --accent:#9CCFAE; --accent-ink:#A8D9B8; --on-accent:#14241B; --accent-soft:#24352C; --ok:#7CC6A0; --bad:#F09A86; color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.55;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:40px 56px}
main{max-width:560px;margin:0 auto;display:flex;flex-direction:column;gap:20px}
header{text-align:center;display:flex;flex-direction:column;gap:6px}
.mono{font-family:var(--display);font-size:2.4rem;letter-spacing:.02em;line-height:1}
.mono span{color:var(--accent-ink)}
.sub{color:var(--muted);font-size:.85rem;letter-spacing:.14em;text-transform:uppercase}
.steps{display:flex;justify-content:center;gap:10px;list-style:none;padding:0;margin:4px 0 0}
.steps li{width:34px;height:34px;border-radius:50%;border:1.5px solid var(--line);display:grid;place-items:center;
  font-size:.85rem;font-variant-numeric:tabular-nums;color:var(--muted);transition:all .3s}
.steps li.done{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.steps li.now{border-color:var(--accent-ink);color:var(--accent-ink);font-weight:600}
.card{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:32px 28px;display:flex;flex-direction:column;gap:18px;
  box-shadow:0 1px 0 var(--line),0 18px 40px -28px rgba(20,25,40,.35)}
.kicker{font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent-ink);font-weight:600}
h1,h2{font-family:var(--display);font-weight:400;margin:0;text-wrap:balance;line-height:1.15}
h2{font-size:1.7rem}
p{margin:0}
.clue{font-family:var(--display);font-size:1.25rem;line-height:1.45;padding:18px 20px;background:var(--accent-soft);border-radius:4px}
.cipher{font-variant-numeric:tabular-nums;letter-spacing:.12em;word-spacing:.3em}
form{display:flex;gap:10px;flex-wrap:wrap}
input{flex:1 1 200px;min-width:0;font:inherit;padding:12px 14px;border:1.5px solid var(--line);border-radius:4px;background:var(--card);color:var(--ink)}
input:focus{outline:none;border-color:var(--accent-ink)}
button{font:inherit;font-weight:600;padding:12px 20px;border-radius:4px;border:0;background:var(--accent);color:var(--on-accent);cursor:pointer}
button:focus-visible,.link:focus-visible{outline:2px solid var(--accent-ink);outline-offset:3px}
.link{background:none;color:var(--muted);padding:0;font-weight:500;text-decoration:underline;text-underline-offset:3px;font-size:.9rem}
.msg{min-height:1.4em;font-size:.95rem}
.msg.ok{color:var(--ok)} .msg.bad{color:var(--bad)}
.hint{font-size:.95rem;color:var(--muted);border-left:2px solid var(--line);padding-left:12px}
.shake{animation:shake .35s}
@keyframes shake{20%,60%{transform:translateX(-6px)}40%,80%{transform:translateX(6px)}}
.reveal{text-align:center;align-items:center;padding-block:44px}
.reveal h1{font-size:clamp(2.6rem,10vw,3.8rem);color:var(--accent-ink)}
.names{font-family:var(--display);font-size:1.5rem}
.details{display:flex;gap:28px;justify-content:center;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:18px;width:100%}
.details div{display:flex;flex-direction:column;gap:2px}
.details b{font-size:.75rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:600}
footer{text-align:center}
canvas{position:fixed;inset:0;pointer-events:none;width:100%;height:100%}
@media (prefers-reduced-motion: reduce){.shake{animation:none}.steps li{transition:none}}
html{-webkit-text-size-adjust:100%}
body{margin:0;padding-top:max(40px,env(safe-area-inset-top,0px));padding-bottom:max(56px,env(safe-area-inset-bottom,0px))}
details summary{cursor:pointer;color:var(--muted);font-size:.9rem;text-decoration:underline;text-underline-offset:3px;width:max-content;list-style:none}
details summary::-webkit-details-marker{display:none}
details[open] summary{display:none}
footer form{display:inline}
.more{display:flex;flex-direction:column;align-items:center;gap:8px;border-top:1px solid var(--line);padding-top:18px;width:100%}
.more span{font-size:.75rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:600}
.btn{display:inline-block;font-weight:600;padding:12px 28px;border-radius:4px;background:var(--accent);color:var(--on-accent);text-decoration:none}
.btn:focus-visible{outline:2px solid var(--accent-ink);outline-offset:3px}