/* =========================================================
   C-Note Music Philly — "Lesson Book" direction
   base · nav · hero · staff · contents
   ========================================================= */
:root{
  --paper:#f4eee2; --paper-2:#ebe3d3; --paper-3:#e2d8c4;
  --ink:#171411; --ink-2:#4b443b; --ink-3:#7a7063;
  --red:#e2432a; --blue:#2448c8; --blue-2:#1d3aa8; --yellow:#f3b61f; --green:#2f8f6b; --pink:#f2a7b8;
  --serif:"Fraunces",Georgia,"Times New Roman",serif;
  --sans:"Figtree",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --hand:"Caveat","Segoe Print","Bradley Hand",cursive;
  --wrap:1240px; --gutter:clamp(16px,4vw,40px);
  --ease:cubic-bezier(.2,.8,.2,1); --spring:cubic-bezier(.34,1.56,.64,1);
  --shadow:5px 5px 0 var(--ink); --shadow-lg:8px 8px 0 var(--ink);
  color-scheme:light;
}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none !important}
html{scroll-behavior:smooth;scroll-padding-top:90px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:18px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:100;opacity:.35;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='p'><feTurbulence type='fractalNoise' baseFrequency='.75' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .45  0 0 0 0 .38  0 0 0 0 .28  0 0 0 .18 0'/></filter><rect width='100%' height='100%' filter='url(%23p)'/></svg>")}
img,svg{display:block}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;-webkit-tap-highlight-color:transparent}
::selection{background:var(--yellow);color:var(--ink)}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:6px}
.skip{position:fixed;left:12px;top:-60px;z-index:200;background:var(--ink);color:var(--paper);padding:10px 16px;border-radius:10px;font-weight:700;text-decoration:none}
.skip:focus{top:12px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.section{padding:clamp(80px,11vw,150px) 0;position:relative}
.hand,.note-hand{font-family:var(--hand);font-weight:700}
strong,b{font-weight:800}

/* type */
.kicker{display:inline-flex;align-items:center;gap:10px;margin:0 0 18px;font-size:13px;font-weight:800;letter-spacing:.16em;text-transform:uppercase}
.kicker::before{content:"";width:12px;height:12px;border-radius:50%;background:var(--red);box-shadow:16px 0 0 var(--yellow),32px 0 0 var(--blue);margin-right:38px}
.h2{font-family:var(--serif);font-variation-settings:"SOFT" 100,"WONK" 1;font-optical-sizing:auto;font-weight:800;font-size:clamp(42px,6.4vw,88px);line-height:.98;letter-spacing:-.025em;margin:0}
.h2 em{font-style:italic;font-weight:500;color:var(--red)}
.sec-head{display:grid;grid-template-columns:1.3fr 1fr;align-items:end;gap:18px 60px;margin-bottom:clamp(40px,6vw,70px)}
.sec-head .kicker{grid-column:1/-1;margin:0}
.sec-sub{margin:0;color:var(--ink-2);max-width:440px}
.sec-head.center{grid-template-columns:1fr;justify-items:center;text-align:center}
@media (max-width:820px){.sec-head{grid-template-columns:1fr}}

/* reveal */
.js .reveal{opacity:0;transform:translateY(34px);transition:opacity .8s ease,transform 1s var(--spring)}
.js .reveal.in{opacity:1;transform:none}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:58px;padding:0 28px;border:2.5px solid var(--ink);border-radius:14px;font-weight:800;font-size:16px;text-decoration:none;box-shadow:var(--shadow);transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s;white-space:nowrap}
.btn:hover{transform:translate(-2px,-2px);box-shadow:var(--shadow-lg)}
.btn:active{transform:translate(4px,4px);box-shadow:1px 1px 0 var(--ink)}
.btn-blue{background:var(--blue);color:#fff}
.btn-red{background:var(--red);color:#fff}
.btn-paper{background:var(--paper)}
.btn-paper:hover{background:#fff}
.btn-sm{height:44px;padding:0 18px;font-size:14px;border-radius:12px;box-shadow:3px 3px 0 var(--ink)}
.btn-sm:hover{box-shadow:5px 5px 0 var(--ink)}
.btn-block{width:100%}

/* ---------- nav ---------- */
.nav{position:fixed;left:50%;top:14px;z-index:60;transform:translateX(-50%);width:min(1240px,calc(100% - 24px));display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 10px 10px 16px;background:rgba(244,238,226,.86);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:2px solid var(--ink);border-radius:18px;box-shadow:4px 4px 0 var(--ink);transition:transform .5s var(--ease),box-shadow .3s}
.nav.hide{transform:translate(-50%,-140%)}
.logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none}
.logo-mark{width:36px;height:36px;border-radius:50%;background:var(--red);color:var(--paper);display:grid;place-items:center;border:2px solid var(--ink);transition:transform .5s var(--spring)}
.logo:hover .logo-mark{transform:rotate(-20deg) scale(1.1)}
.logo-word{font-family:var(--serif);font-variation-settings:"SOFT" 100,"WONK" 1;font-weight:800;font-size:21px;letter-spacing:-.02em;line-height:1}
.logo-word .hand{color:var(--red);font-size:24px;font-weight:700;margin-left:2px}
.nav-links{display:flex;gap:4px}
.nav-links a{text-decoration:none;font-weight:700;font-size:15px;padding:9px 14px;border-radius:10px;transition:background .2s}
.nav-links a:hover,.nav-links a.active{background:var(--paper-3)}
.menu-btn{display:none;width:44px;height:44px;border-radius:12px;border:2px solid var(--ink);background:var(--yellow);position:relative}
.menu-btn span{position:absolute;left:11px;right:11px;height:2.5px;background:var(--ink);border-radius:2px;transition:transform .35s var(--ease),opacity .2s}
.menu-btn span:nth-child(1){top:13px}.menu-btn span:nth-child(2){top:19.5px}.menu-btn span:nth-child(3){top:26px}
.menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-btn[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}
.mmenu{position:fixed;left:12px;right:12px;top:82px;z-index:59;display:flex;flex-direction:column;padding:10px;background:var(--paper);border:2px solid var(--ink);border-radius:18px;box-shadow:var(--shadow);animation:drop .35s var(--ease)}
.mmenu a{text-decoration:none;font-family:var(--serif);font-variation-settings:"SOFT" 100;font-weight:700;font-size:26px;padding:10px 12px;border-radius:10px}
.mmenu a:active{background:var(--paper-3)}
.mmenu .mm-cta{margin-top:6px;background:var(--blue);color:#fff;border:2px solid var(--ink)}
@keyframes drop{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
@media (max-width:1020px){.nav-links{display:none}.menu-btn{display:block}}
@media (max-width:520px){.nav-cta{display:none}.logo-word{font-size:18px}}

/* ---------- hero ---------- */
.hero{padding:clamp(120px,15vh,160px) 0 clamp(60px,8vw,100px);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(30px,5vw,70px);align-items:center}
.rating-chip{display:inline-flex;align-items:center;gap:10px;padding:8px 14px;border:2px solid var(--ink);border-radius:999px;background:#fff;font-size:14px;font-weight:600;text-decoration:none;box-shadow:3px 3px 0 var(--ink);transition:transform .2s var(--ease)}
.rating-chip:hover{transform:translate(-1px,-1px) rotate(-1deg)}
.rating-chip .stars{color:var(--yellow);letter-spacing:1px;-webkit-text-stroke:.6px var(--ink)}
.hero-title{font-family:var(--serif);font-variation-settings:"SOFT" 100,"WONK" 1;font-optical-sizing:auto;font-weight:900;font-size:clamp(50px,7.4vw,108px);line-height:.92;letter-spacing:-.035em;margin:22px 0 20px}
.hero-title .line{display:block;overflow:hidden;padding-bottom:.06em;margin-bottom:-.06em}
.hero-title .li{display:inline-block;transition:transform 1.1s var(--ease);transition-delay:calc(var(--d) * 110ms)}
.js body:not(.ready) .hero-title .li{transform:translateY(105%)}
.hero-title em{font-style:italic;font-weight:600;color:var(--blue);position:relative;white-space:nowrap}
.hero-title em::after{content:"";position:absolute;left:0;right:0;bottom:.02em;height:.14em;background:var(--yellow);z-index:-1;transform-origin:left;transform:scaleX(0);transition:transform .8s var(--ease) 1.1s}
.ready .hero-title em::after{transform:scaleX(1)}
.hero-title .line:nth-child(2){position:relative;z-index:0}
.pop{transition:opacity .7s ease,transform .9s var(--spring);transition-delay:calc(var(--d) * 110ms + 200ms)}
.js body:not(.ready) .pop{opacity:0;transform:translateY(18px)}
.hero-sub{max-width:540px;margin:0 0 28px;color:var(--ink-2);font-size:clamp(17px,1.4vw,20px)}
.hero-ctas{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:30px}
.trust{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:10px 22px;font-size:14px;color:var(--ink-2)}
.trust li{display:flex;align-items:center;gap:8px}
.trust b{font-family:var(--serif);font-variation-settings:"SOFT" 100;font-size:20px;color:var(--ink)}
.hero-copy{position:relative}
.hero-note{position:absolute;right:0;top:clamp(250px,24vw,330px);display:flex;flex-direction:column-reverse;align-items:flex-start;color:var(--red);font-size:26px;transform:rotate(-5deg);pointer-events:none}
.scribble{fill:none;stroke:currentColor;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.hero-note .scribble{width:90px;height:46px;margin-left:-10px;transform:scaleX(-1)}
.js .scribble path{stroke-dasharray:200;stroke-dashoffset:200;transition:stroke-dashoffset 1.2s var(--ease) .9s}
.js .ready .hero-note .scribble path,.js .in .scribble path,.js .scribble.in path{stroke-dashoffset:0}
@media (max-width:1180px){.hero-note{display:none}}

.cover-wrap{position:relative;perspective:1200px}
.cover{position:relative;aspect-ratio:440/620;max-width:460px;margin:0 auto;background:var(--blue);border:3px solid var(--ink);border-radius:10px 20px 20px 10px;box-shadow:12px 12px 0 var(--ink);overflow:hidden;transform:rotate(3deg);transition:transform .8s var(--spring)}
.cover::before{content:"";position:absolute;left:0;top:0;bottom:0;width:22px;background:linear-gradient(90deg,rgba(0,0,0,.28),rgba(0,0,0,.05) 60%,rgba(255,255,255,.12));z-index:2;border-right:2px solid rgba(23,20,17,.35)}
.cover:hover{transform:rotate(0deg) translateY(-6px)}
.cover-top,.cover-bottom{position:absolute;left:34px;right:18px;display:flex;justify-content:space-between;align-items:baseline;color:var(--paper);font-weight:800;font-size:13px;letter-spacing:.14em;text-transform:uppercase;z-index:3}
.cover-top{top:18px;flex-direction:column;align-items:flex-start;gap:2px}
.cover-top span:last-child{font-family:var(--serif);font-variation-settings:"SOFT" 100,"WONK" 1;font-style:italic;font-weight:700;font-size:26px;letter-spacing:-.01em;text-transform:none;color:var(--yellow)}
.cover-bottom{bottom:16px;font-size:12px}
.cover-art{position:absolute;left:22px;right:0;top:84px;bottom:40px;width:calc(100% - 22px);height:calc(100% - 124px)}
.cover-art .sh{transition:transform .9s var(--spring);transition-delay:calc(var(--i) * 80ms + 300ms);transform-box:fill-box;transform-origin:center}
.js body:not(.ready) .cover-art .sh{transform:translateY(40px) scale(.2) rotate(-40deg);opacity:0}
.cover-art .sh{translate:0 0}
.ready .cover-art .sh{transition:transform .9s var(--spring) calc(var(--i) * 80ms + 300ms),opacity .5s ease calc(var(--i) * 80ms + 300ms),translate .6s var(--ease) 0s}
.burst{position:absolute;right:-14px;top:-26px;width:150px;height:150px;display:grid;place-items:center;text-align:center;z-index:4;animation:wobble 6s ease-in-out infinite;transition:scale .3s var(--spring)}
.burst svg{position:absolute;inset:0;width:100%;height:100%;animation:spin 30s linear infinite}
.burst span{position:relative;font-weight:800;font-size:14px;line-height:1.1;text-transform:uppercase;letter-spacing:.04em}
.burst b{font-family:var(--serif);font-variation-settings:"SOFT" 100,"WONK" 1;font-size:30px;letter-spacing:-.02em}
.burst:hover{scale:1.1}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes wobble{0%,100%{transform:rotate(-8deg)}50%{transform:rotate(6deg)}}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr}.cover-wrap{max-width:380px;margin:20px auto 0;width:100%}.burst{width:120px;height:120px;right:-6px}}
@media (max-width:420px){.hero-ctas .btn{width:100%}}

/* ---------- staff ---------- */
.staff-sec{padding:clamp(60px,8vw,110px) 0;background:var(--paper-2);border-block:2px solid var(--ink)}
.staff-title{font-family:var(--serif);font-variation-settings:"SOFT" 100,"WONK" 1;font-weight:700;font-size:clamp(30px,4.2vw,56px);letter-spacing:-.02em;line-height:1.05;text-align:center;margin:0 auto 34px;max-width:900px}
.staff-title em{color:var(--blue)}
.staff-box{position:relative;max-width:1060px;margin:0 auto}
.staff{width:100%;height:auto;overflow:visible}
.staff .line{stroke:var(--ink);stroke-width:2;stroke-dasharray:1000;stroke-dashoffset:1000;transition:stroke-dashoffset 1.4s var(--ease)}
.staff.in .line{stroke-dashoffset:0}
.staff .n{cursor:pointer;transform-box:fill-box;transform-origin:50% 100%;opacity:0;transform:translateY(-60px);transition:opacity .4s ease,transform .7s var(--spring)}
.staff.in .n{opacity:1;transform:none}
.staff .n:hover .head,.staff .n.hit .head{fill:var(--red)}
.staff .n.hit{animation:bop .45s var(--spring)}
.staff .head{fill:var(--ink);transition:fill .2s}
.staff .stem{stroke:var(--ink);stroke-width:3}
.staff .ledger{stroke:var(--ink);stroke-width:2}
.staff .lbl{font-family:var(--hand);font-weight:700;font-size:30px;fill:var(--ink-3);text-anchor:middle}
.staff .hitbox{fill:transparent}
.staff .tsig{font-family:var(--serif);font-weight:900;font-size:56px;fill:var(--ink)}
@keyframes bop{40%{transform:translateY(-14px) rotate(-6deg)}}
.staff-hint{position:absolute;right:2%;top:-18px;display:flex;align-items:flex-start;gap:4px;color:var(--red);font-size:26px;transform:rotate(4deg)}
.staff-hint .scribble{width:74px;height:48px;margin-top:18px}
@media (max-width:640px){.staff-hint{top:-44px;right:0;font-size:22px}}

/* ---------- contents / lessons ---------- */
.toc-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:clamp(30px,5vw,70px);align-items:start}
.toc{list-style:none;margin:0;padding:0;border-top:2px solid var(--ink)}
.toc-row{position:relative;display:grid;grid-template-columns:56px auto 1fr auto;align-items:baseline;gap:14px;padding:24px 14px 24px 8px;border-bottom:2px solid var(--ink);cursor:pointer;outline:none;isolation:isolate}
.toc-row::before{content:"";position:absolute;inset:0;background:var(--c);transform:scaleX(0);transform-origin:left;transition:transform .45s var(--ease);z-index:-1}
.toc-row.active::before{transform:scaleX(1)}
.toc-row.active{color:var(--paper)}
.toc-row.active[data-art="drums"]{color:var(--ink)}
.toc-row:focus-visible{outline:3px solid var(--blue);outline-offset:-3px}
.toc-no{font-family:var(--serif);font-variation-settings:"SOFT" 100;font-weight:600;font-size:20px;opacity:.6}
.toc-main{display:flex;flex-direction:column;gap:4px;min-width:0}
.toc-name{font-family:var(--serif);font-variation-settings:"SOFT" 100,"WONK" 1;font-weight:800;font-size:clamp(30px,3.6vw,48px);line-height:1;letter-spacing:-.025em;transition:transform .45s var(--ease)}
.toc-row.active .toc-name{transform:translateX(8px)}
.toc-desc{font-size:15px;opacity:.8;max-width:420px}
.toc-dots{align-self:center;height:2px;background-image:radial-gradient(circle,currentColor 1.2px,transparent 1.6px);background-size:10px 2px;background-repeat:repeat-x;opacity:.5;min-width:20px}
.toc-lvl{font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;white-space:nowrap}
.toc-art-wrap{position:sticky;top:110px}
.toc-art{position:relative;aspect-ratio:1;border:3px solid var(--ink);border-radius:18px;overflow:hidden;box-shadow:var(--shadow-lg);background:var(--paper)}
.toc-art .art{position:absolute;inset:0;width:100%;height:100%;opacity:0;transition:opacity .35s ease}
.toc-art .art.show{opacity:1}
.toc-art .a{transform-box:fill-box;transform-origin:center;transform:scale(0) rotate(-30deg);transition:transform .6s var(--spring)}
.toc-art .art.show .a{transform:none;transition-delay:calc(var(--i) * 60ms + 80ms)}
.toc-caption{margin:14px 0 0;font-family:var(--hand);font-weight:700;font-size:26px;text-align:center}
@media (max-width:900px){.toc-grid{grid-template-columns:1fr}.toc-art-wrap{position:relative;top:0;max-width:360px;margin:0 auto;order:-1;width:100%}}
@media (max-width:560px){.toc-row{grid-template-columns:40px 1fr;gap:6px 10px}.toc-dots{display:none}.toc-lvl{grid-column:2}}