:root{color-scheme:dark;--bg:#0a0c10;--surface:#12161c;--raised:#181e26;--line:rgba(255,255,255,.11);--muted:#929ba8;--text:#f4f6f8;--accent:#f0c36c;--soft:rgba(240,195,108,.11);--cyan:#72d9dc}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}button,select{font:inherit}.app{max-width:1500px;margin:auto;min-height:100vh}.site-header{display:flex;align-items:center;justify-content:space-between;padding:20px clamp(20px,4vw,56px);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:9px;color:var(--text);font-size:13px;font-weight:750;text-decoration:none}.brand-mark{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--cyan),var(--accent));box-shadow:0 0 14px rgba(114,217,220,.35)}.site-header p,.eyebrow{margin:0;color:var(--muted);font-size:10px;font-weight:750;letter-spacing:.16em;text-transform:uppercase}.hero{display:grid;grid-template-columns:1.2fr 1fr;align-items:end;gap:50px;padding:clamp(50px,8vw,110px) clamp(20px,6vw,90px);border-bottom:1px solid var(--line);background:radial-gradient(circle at 78% 10%,rgba(114,217,220,.08),transparent 30%)}h1,h2,h3,p{margin-top:0}h1{margin:12px 0 0;font-size:clamp(42px,7vw,92px);font-weight:610;line-height:.94;letter-spacing:-.065em}h1 span{color:var(--accent)}h2{margin:7px 0 12px;font-size:clamp(25px,3vw,40px);letter-spacing:-.04em}.lede{max-width:570px;margin:0;color:#c0c7cf;font-size:clamp(17px,2vw,23px);line-height:1.55}.lesson{display:grid;grid-template-columns:auto 1fr 1fr;gap:32px;padding:42px clamp(20px,4vw,56px);border-bottom:1px solid var(--line)}.lesson-number{color:var(--accent);font:500 42px/1 Georgia,serif}.lesson p:not(.eyebrow){max-width:650px;margin:0;color:var(--muted);line-height:1.65}.same-notes{display:grid;align-self:center;background:var(--surface);border:1px solid var(--line);border-radius:12px}.same-notes div{display:flex;justify-content:space-between;gap:20px;padding:16px 18px}.same-notes div+div{border-top:1px solid var(--line)}.same-notes span{color:var(--muted);letter-spacing:.08em}.explorer,.map-section,.quiz{padding:48px clamp(20px,4vw,56px);border-bottom:1px solid var(--line)}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px}.section-heading h2{margin-bottom:0}.section-heading label{display:grid;gap:7px;color:var(--muted);font-size:10px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}.section-heading select{min-width:120px;padding:10px 34px 10px 12px;background:var(--raised);color:var(--text);border:1px solid var(--line);border-radius:8px}.mode-tabs{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-bottom:10px}.mode-tabs button{padding:14px 8px;background:transparent;color:var(--muted);border:1px solid var(--line);border-radius:8px;cursor:pointer}.mode-tabs button:hover{color:var(--text)}.mode-tabs button.active{background:var(--soft);color:var(--accent);border-color:rgba(240,195,108,.5)}.mode-card{padding:clamp(24px,4vw,48px);background:var(--surface);border:1px solid var(--line);border-radius:14px}.mode-intro{display:flex;align-items:center;justify-content:space-between;gap:20px}.family{margin-bottom:6px;color:var(--cyan);font-size:11px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}.mode-intro h3{margin:0;font-size:clamp(35px,5vw,62px);letter-spacing:-.055em}.mood{margin:8px 0 0;color:var(--muted);font-size:17px}.play,.next{padding:12px 18px;background:var(--accent);color:#17120a;font-weight:750;border:0;border-radius:999px;cursor:pointer}.play.playing{background:var(--cyan)}.note-strip{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;margin:36px 0}.note{display:grid;place-items:center;min-height:86px;background:var(--raised);border:1px solid var(--line);border-radius:9px;font-size:clamp(20px,3vw,34px);font-weight:650}.note small{color:var(--muted);font-size:10px;letter-spacing:.1em}.note.root{color:var(--accent);border-color:rgba(240,195,108,.55)}.note.color{box-shadow:inset 0 -3px var(--cyan)}.note.sounding{background:var(--accent);color:#15110a;transform:translateY(-3px)}.mode-details{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:9px;overflow:hidden}.mode-details>div{display:grid;gap:7px;padding:18px;background:var(--raised)}.detail-label{color:var(--muted);font-size:10px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}.tip{margin:22px 0 0;padding-left:15px;color:#cdd2d8;line-height:1.6;border-left:2px solid var(--accent)}.mode-map{display:grid;grid-template-columns:repeat(7,1fr);border:1px solid var(--line);border-radius:12px;overflow:hidden}.map-item{min-height:135px;padding:18px;background:var(--surface)}.map-item+.map-item{border-left:1px solid var(--line)}.map-item span{color:var(--muted);font-size:11px}.map-item h3{margin:8px 0;font-size:18px}.map-item strong{color:var(--accent);font-size:13px}.map-note{margin:14px 0 0;color:var(--muted);font-size:12px}.quiz{display:grid;grid-template-columns:1fr 1.2fr;gap:26px 50px;align-items:end}.quiz h2{margin-bottom:7px}.quiz p{color:var(--muted);line-height:1.6}.answers{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.answers button{padding:14px;background:var(--raised);color:var(--text);border:1px solid var(--line);border-radius:8px;cursor:pointer}.answers button:hover{border-color:var(--accent)}.answers button.correct{border-color:#72dca1;background:rgba(114,220,161,.12)}.answers button.wrong{border-color:#f08080;background:rgba(240,128,128,.1)}.feedback{min-height:24px;margin:0}.next{justify-self:start}
@media(max-width:850px){.hero,.lesson,.quiz{grid-template-columns:1fr}.lesson-number{display:none}.mode-tabs{grid-template-columns:repeat(4,1fr)}.mode-details{grid-template-columns:repeat(2,1fr)}.mode-map{grid-template-columns:repeat(2,1fr)}.map-item+.map-item{border-left:0}.map-item{border:1px solid var(--line)}.same-notes{max-width:600px}}@media(max-width:520px){.hero{padding-top:48px}.mode-tabs{grid-template-columns:repeat(2,1fr)}.note-strip{gap:3px}.note{min-height:68px;font-size:18px}.mode-details{grid-template-columns:1fr}.mode-intro{align-items:flex-start}.play{padding:10px 13px}.same-notes div{display:grid}.answers{grid-template-columns:1fr}}