:root{
  --paper:#FAF6EF; --ink:#1A1A1A; --accent:#C15F3C; --data:#3D7068;
  --faint:#6B6357; --card:#FFFDF8; --line:#E2DACB; --wash:#F2EFE6;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto} *{transition:none!important;animation:none!important}}
body{background:var(--paper);color:var(--ink);font-family:'Source Serif 4',Georgia,serif;font-size:18px;line-height:1.65;-webkit-font-smoothing:antialiased}
.ui,button,input,select{font-family:'Inter',system-ui,sans-serif}
a{color:var(--accent)}
h3{font-size:1.05rem;font-weight:600;margin-bottom:8px}
p{margin-bottom:14px}
.hidden{display:none!important}
.serif{font-family:'Source Serif 4',Georgia,serif}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:40;display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;background:rgba(250,246,239,.92);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.wordmark{font-family:'Source Serif 4',serif;font-weight:700;font-size:1.05rem;color:var(--ink);text-decoration:none}
.nav nav{display:flex;gap:18px}
.nav nav a{font-size:.85rem;font-weight:500;color:var(--faint);text-decoration:none}
.nav nav a:hover{color:var(--accent)}
@media (max-width:640px){.nav nav{display:none}}

/* ---------- layout ---------- */
.wrap{max-width:1060px;margin:0 auto;padding:64px 24px;border-bottom:1px solid var(--line)}
.wrap.slim{max-width:680px}
.eyebrow{font-family:'Inter',sans-serif;font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:10px}
.display{font-size:clamp(1.7rem,3.4vw,2.5rem);line-height:1.15;font-weight:700;margin-bottom:14px;letter-spacing:-.01em}
.sub{font-size:1.02rem;color:#3A352C;max-width:640px;margin-bottom:26px}
.micro{font-size:.78rem;color:var(--faint)}
.margin-note{font-style:italic;color:var(--faint);font-size:.92rem;border-left:2px solid var(--accent);padding-left:12px;margin:18px 0;max-width:640px}

/* ---------- hero ---------- */
.hero{max-width:1160px;margin:0 auto;padding:48px 24px 64px;display:grid;grid-template-columns:1fr;gap:36px;border-bottom:1px solid var(--line)}
@media (min-width:960px){.hero{grid-template-columns:1.05fr 1fr;align-items:start;padding-top:72px}}
.hero-copy .badge{display:inline-block;background:var(--card);border:1px solid var(--line);border-radius:999px;
  padding:7px 14px;font-size:.8rem;font-weight:500;color:var(--data);margin-bottom:22px}
.hero-copy h1{font-size:clamp(2.3rem,5.2vw,3.9rem);line-height:1.06;font-weight:700;letter-spacing:-.015em;margin-bottom:22px}
.lede{font-size:1.06rem;color:#3A352C;max-width:520px}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0 10px}
.cta .btn{text-decoration:none;display:inline-flex;align-items:center}
@media (max-width:959px){
  .hero-copy{order:2}
  .hero-instrument{order:1}
  .hero-copy h1{font-size:clamp(1.9rem,7vw,2.6rem)}
}

/* ---------- instrument card (the test modal) ---------- */
.instrcard{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;
  box-shadow:0 10px 30px rgba(26,26,26,.08), 0 1px 3px rgba(26,26,26,.05)}
.instr-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}
.studychip{background:var(--wash);border:1px solid var(--line);border-radius:999px;padding:6px 12px;
  font-size:.72rem;font-weight:600;letter-spacing:.04em;color:var(--data)}
.clock{font-variant-numeric:tabular-nums;font-weight:600;font-size:.9rem;background:var(--ink);color:var(--paper);
  border-radius:999px;padding:7px 13px;min-width:64px;text-align:center;border:2px solid var(--accent)}
.instr-title{font-family:'Source Serif 4',serif;font-size:1.65rem;font-weight:700;margin-bottom:6px}
.instr-instruction{font-size:.88rem;color:var(--faint);margin-bottom:12px}
.lvl{font-size:.75rem;font-weight:600;color:var(--data);text-transform:uppercase;letter-spacing:.12em;text-align:center;margin-bottom:6px}
.hintline{text-align:center;font-size:.85rem;color:var(--faint)}

.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;max-width:320px;margin:10px auto}
.cell{background:#fff;border:1px solid var(--line);border-radius:10px;aspect-ratio:1;display:flex;align-items:center;justify-content:center}
.cell.missing{border:2px dashed var(--accent);background:#FBF3EE}
.optrow{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;max-width:360px;margin:10px auto}
.optcell{background:#fff;border:1.5px solid var(--line);border-radius:10px;aspect-ratio:1;display:flex;align-items:center;justify-content:center;cursor:pointer;padding:0}
.optcell:hover{border-color:var(--accent)}
.helprow{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap;justify-content:center}

/* ---------- buttons & chips ---------- */
button.btn,.btn{background:var(--accent);color:#fff;border:none;border-radius:999px;padding:12px 22px;
  font-size:.95rem;font-weight:600;cursor:pointer;min-height:44px}
button.btn:hover,.btn:hover{filter:brightness(1.07)}
.btn.ghost{background:transparent;color:var(--accent);border:1.5px solid var(--accent)}
button.chip{background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:8px 14px;font-size:.85rem;cursor:pointer;min-height:40px;color:var(--ink)}
button.chip:hover{border-color:var(--accent)}
button.chip[aria-pressed="true"]{border-color:var(--data);background:var(--data);color:#fff}
button.chip.chip-accent{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0 16px}
.opt{display:block;width:100%;text-align:left;background:#fff;border:1.5px solid var(--line);border-radius:10px;
  padding:12px 14px;margin:8px 0;font-size:.95rem;cursor:pointer;min-height:44px;color:var(--ink)}
.opt:hover{border-color:var(--accent)}
.opt.picked{border-color:var(--data);background:#EDF4F2}
.listen{background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:6px 14px;font-size:.8rem;
  cursor:pointer;color:var(--faint);min-height:36px;margin-bottom:14px}
.listen:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- generic instrument blocks ---------- */
.instr{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;margin:22px 0;box-shadow:0 1px 3px rgba(26,26,26,.05)}
.instr-id{font-family:'Inter',sans-serif;font-size:.7rem;letter-spacing:.12em;color:var(--data);font-weight:600;text-transform:uppercase;margin-bottom:6px}
.limit{font-size:.82rem;color:var(--faint);font-style:italic;margin-top:14px;padding-top:10px;border-top:1px dashed var(--line)}
.datacard{background:var(--wash);border:1px solid var(--line);border-radius:10px;padding:18px;margin:16px 0;font-family:'Inter',sans-serif;font-size:.9rem}
.aipanel{background:#F4F1E9;border:1px solid var(--line);border-radius:10px;padding:14px;margin-top:14px}
.aimsg{background:#fff;border-radius:10px;padding:10px 12px;margin-top:10px;font-family:'Inter',sans-serif;font-size:.88rem;border:1px solid var(--line)}
.aimsg::before{content:attr(data-src);display:block;font-size:.65rem;letter-spacing:.1em;text-transform:uppercase;color:var(--data);margin-bottom:4px;font-weight:600}
.aimsg:not([data-src])::before{content:"AI · demonstration helper"}
.notice{background:#FBF3EE;border:1px solid var(--accent);border-radius:10px;padding:16px;margin:16px 0;font-size:.9rem}

/* ---------- card grids ---------- */
.cards3{display:grid;grid-template-columns:1fr;gap:14px}
@media (min-width:720px){.cards3{grid-template-columns:repeat(3,1fr)}}
.cards4{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (min-width:860px){.cards4{grid-template-columns:repeat(4,1fr)}}
.mcard,.dcard,.tcard,.pcard{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:0 1px 3px rgba(26,26,26,.04)}
.mcard h3,.dcard h3{font-size:1.05rem;margin:10px 0 6px}
.mcard p,.dcard p,.tcard p,.pcard p{font-size:.88rem;color:#4A443A;margin-bottom:0}
.mchip,.dchip{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:11px;
  background:var(--data);color:#fff;font-weight:600;font-size:.95rem}
.mchip{background:var(--wash);color:var(--data);border:1px solid var(--line);font-size:.8rem}
.dcard{text-decoration:none;color:var(--ink);display:block;transition:border-color .15s}
.dcard:hover{border-color:var(--accent)}
.dstatus{display:inline-block;margin-top:12px;font-size:.72rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}
.dstatus.live{color:var(--accent)}
.tcard b{display:block;font-family:'Source Serif 4',serif;font-size:1.25rem;margin-bottom:6px;color:var(--data)}

/* ---------- designer ---------- */
.designer{display:grid;grid-template-columns:1fr;gap:18px;margin-top:8px}
@media (min-width:900px){.designer{grid-template-columns:340px 1fr}}
.designer-controls{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px}
.designer-controls label{display:block;font-size:.8rem;font-weight:600;color:var(--faint);margin-bottom:14px}
.designer-controls select{display:block;width:100%;margin-top:6px;padding:11px 12px;font-size:.92rem;color:var(--ink);
  background:#fff;border:1.5px solid var(--line);border-radius:10px;appearance:none;
  background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236B6357' stroke-width='1.8' fill='none'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 12px center}
.designer-controls select:focus{outline:2px solid var(--accent);outline-offset:1px}
.designer-cards{display:grid;grid-template-columns:1fr;gap:14px}
@media (min-width:640px){.designer-cards{grid-template-columns:1fr 1fr}}
.pstep{font-size:.7rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--faint)}
.pcard h3{font-family:'Source Serif 4',serif;font-size:1.3rem;margin:6px 0 8px}

/* ---------- timeline ---------- */
.tl-head{font-family:'Source Serif 4',serif;font-size:1.3rem;margin:40px 0 6px}
.tl{display:flex;gap:12px;overflow-x:auto;padding:8px 0 16px;-webkit-overflow-scrolling:touch}
.tlcard{min-width:210px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px;font-size:.85rem}
.tlcard b{display:block;font-size:1rem;margin-bottom:4px;color:var(--accent)}

/* ---------- games ---------- */
.simon{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;max-width:300px;margin:16px auto}
.stile{aspect-ratio:1;border-radius:12px;border:none;cursor:pointer;opacity:.75;min-height:44px}
.stile.lit{opacity:1;transform:scale(1.05);box-shadow:0 0 0 3px var(--ink)}
.cipherline{font-size:1.5rem;letter-spacing:.35em;text-align:center;margin:14px 0;word-break:break-all}
.keyrow{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;font-size:.95rem;margin:10px 0}
.keyrow span{background:#fff;border:1px solid var(--line);border-radius:8px;padding:6px 10px}
.locked{background:#EFEAE0;border:1.5px dashed var(--faint);border-radius:10px;padding:18px;text-align:center;font-size:.9rem;color:var(--faint)}

/* ---------- overlays, footer ---------- */
.overlay{position:fixed;inset:0;background:rgba(26,26,26,.45);display:flex;align-items:center;justify-content:center;padding:20px;z-index:50}
.modal{background:var(--paper);border-radius:16px;padding:26px;max-width:540px;width:100%;max-height:85vh;overflow-y:auto}
.modal h2{font-size:1.35rem;font-weight:700}
pre.json{background:#1A1A1A;color:#E8E2D5;padding:14px;border-radius:8px;font-size:.72rem;overflow-x:auto;margin:12px 0}
footer{max-width:1060px;margin:0 auto;padding:28px 24px 60px;font-size:.78rem;color:var(--faint)}
svg text{font-family:'Inter',sans-serif}
.timerdot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--data);margin-right:6px;animation:pulse 2s infinite}
@keyframes pulse{50%{opacity:.3}}