:root{--paper:#f4f0e8;--paper2:#eae3d7;--ink:#171816;--muted:#777166;--line:#c9c1b3;--accent:#8c3c2c;--dark:#20211f;--max:1240px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;line-height:1.62}img{display:block;max-width:100%}a{color:inherit}.site-header{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;gap:2rem;padding:1rem max(24px,calc((100vw - var(--max))/2));border-bottom:1px solid rgba(90,84,76,.24);background:rgba(244,240,232,.93);backdrop-filter:blur(14px)}.brand{text-decoration:none;font:700 1.05rem "Iowan Old Style",Baskerville,Georgia,serif}nav{display:flex;gap:1.25rem;font-size:.8rem}nav a{text-decoration:none;color:var(--muted)}nav a:hover,nav a.active{color:var(--ink)}main{width:min(var(--max),calc(100% - 48px));margin:auto}.hero{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(360px,.95fr);gap:clamp(3rem,7vw,7rem);align-items:center;min-height:72vh;padding:6.5rem 0 5.5rem;border-bottom:1px solid var(--line)}.eyebrow,.kicker{margin:0 0 1rem;font-size:.68rem;font-weight:750;letter-spacing:.15em;color:var(--muted)}h1,h2,h3{font-family:"Iowan Old Style",Baskerville,Georgia,serif}h1{margin:0;font-size:clamp(3.8rem,7.2vw,6.8rem);line-height:.92;letter-spacing:-.045em;font-weight:500}.hero-copy{max-width:650px;margin:1.8rem 0 0;font-size:clamp(1.04rem,1.65vw,1.3rem)}.route{display:flex;flex-wrap:wrap;gap:.62rem;margin-top:2.5rem;font-size:.76rem;color:var(--muted)}.route b{font-weight:400}.hero-visual{padding:.8rem;background:var(--dark);box-shadow:0 24px 60px rgba(31,29,25,.12)}.hero-visual img{width:100%;aspect-ratio:1.35/1;object-fit:cover;filter:saturate(.85)}.visual-meta{display:flex;justify-content:space-between;padding:.15rem .1rem .8rem;color:#d9d5cd;font-size:.62rem;letter-spacing:.13em}.hero-visual p{margin:.8rem .15rem .1rem;color:#d9d5cd;font:400 .95rem "Iowan Old Style",Baskerville,Georgia,serif}.setup{padding:5rem 0 5.5rem;border-bottom:1px solid var(--line)}.setup-head{display:grid;grid-template-columns:1.2fr .8fr;gap:3rem;align-items:end;margin-bottom:2.2rem}.setup h2,.future h2{margin:0;font-size:clamp(2rem,4vw,3.6rem);line-height:1;letter-spacing:-.035em;font-weight:500}.setup-head p{margin:0;color:var(--muted)}.setup-grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}.setup-grid div{min-height:104px;padding:1rem 1.1rem;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.setup-grid span,.setup-grid strong{display:block}.setup-grid span{margin-bottom:.55rem;font-size:.67rem;text-transform:uppercase;letter-spacing:.09em;color:var(--muted)}.setup-grid strong{font:500 1.08rem "Iowan Old Style",Baskerville,Georgia,serif}.note,figcaption{margin-top:.8rem;font-size:.75rem!important;line-height:1.55;color:var(--muted)}.chapter{display:grid;grid-template-columns:125px minmax(0,1fr);gap:3.2rem;padding:7rem 0;border-bottom:1px solid var(--line)}.rail{position:sticky;top:95px;align-self:start;display:grid;gap:.35rem}.rail span{font:500 1.05rem "Iowan Old Style",Baskerville,Georgia,serif}.rail small{font-size:.62rem;letter-spacing:.12em;color:var(--muted)}.chapter-body{max-width:930px}.chapter h2{max-width:820px;margin:0 0 1.6rem;font-size:clamp(2.35rem,5vw,4.6rem);line-height:1;letter-spacing:-.04em;font-weight:500}.chapter h3{margin:4rem 0 1rem;font-size:1.75rem;line-height:1.1;font-weight:500}.chapter h4{margin:0 0 .6rem;font:700 .92rem inherit}.chapter p,.future p{max-width:730px;font-size:1rem}.lead{max-width:760px!important;margin-bottom:2.5rem;font:400 1.3rem/1.5 "Iowan Old Style",Baskerville,Georgia,serif}.flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:.8rem;align-items:stretch;margin:2.6rem 0}.flow>div{min-width:0;padding:1.1rem .9rem;border:1px solid var(--line);background:rgba(255,255,255,.3);text-align:center}.flow span{display:block;margin-bottom:.5rem;font-size:.64rem;text-transform:uppercase;letter-spacing:.11em;color:var(--muted)}.flow>b{align-self:center;font-weight:400;color:var(--muted)}.eq{overflow:auto;margin:2rem 0;padding:1.3rem 1rem;border-top:1px solid var(--line);border-bottom:1px solid var(--line);text-align:center}.eq.dark{background:var(--dark);color:#f3eee6;border-color:var(--dark)}.derivation,.method{margin:2.1rem 0 3rem;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.derivation summary,.method summary{list-style:none;cursor:pointer;padding:1rem 0}.derivation summary::-webkit-details-marker,.method summary::-webkit-details-marker{display:none}.derivation summary{display:flex;gap:1rem;font-size:.78rem;font-weight:700}.derivation summary em{margin-left:auto;color:var(--muted);font-style:normal;font-weight:400}.derivation summary:after,.method summary:after{content:"+";margin-left:.75rem;font-size:1rem;font-weight:400}.derivation[open] summary:after,.method[open] summary:after{content:"−"}.steps{padding:.4rem 0 1.4rem}.steps article{display:grid;grid-template-columns:42px minmax(0,1fr);gap:1rem;padding:1.2rem 0;border-top:1px solid rgba(110,103,93,.18)}.steps i{display:grid;place-items:center;width:28px;height:28px;border:1px solid var(--line);border-radius:50%;font-style:normal;font-size:.7rem;color:var(--muted)}.steps p{font-size:.93rem;color:#363733}.method p{margin:0;padding:0 0 1.1rem;color:var(--muted);font-size:.9rem}figure{margin:3rem 0 3.4rem}figure img{width:100%;background:#fff;border:1px solid var(--line)}.feature img{box-shadow:0 22px 55px rgba(30,29,27,.08)}.question{display:grid;gap:.55rem;margin:4rem 0 1.5rem;padding:1.5rem;border-left:3px solid var(--accent);background:rgba(255,255,255,.32)}.question span,.tag,.audio-head span{font-size:.65rem;letter-spacing:.12em;color:var(--muted)}.question strong{font:500 clamp(1.7rem,3.4vw,2.7rem) "Iowan Old Style",Baskerville,Georgia,serif}.audio-panel{margin:3.5rem 0;padding:1.5rem;background:var(--paper2);border:1px solid var(--line)}.audio-head{display:grid;grid-template-columns:1fr .8fr;gap:2rem;align-items:end;margin-bottom:1.3rem}.audio-head h3{margin:0}.audio-head p{margin:0;color:var(--muted);font-size:.85rem}.audio-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}.audio-grid article{padding:.9rem;background:var(--paper)}audio{width:100%;height:34px}.pull{max-width:800px!important;margin:3.7rem 0;padding-left:1.3rem;border-left:2px solid var(--accent);font:400 clamp(1.55rem,3vw,2.25rem)/1.28 "Iowan Old Style",Baskerville,Georgia,serif!important}.future{display:grid;grid-template-columns:.8fr 1.2fr;gap:4rem;padding:5.5rem 0;border-bottom:1px solid var(--line)}.future>div:last-child{align-self:end}.tag{text-transform:uppercase}footer{width:min(var(--max),calc(100% - 48px));margin:auto;padding:3rem 0 5rem;font-size:.72rem;color:var(--muted)}@media(max-width:980px){.hero{grid-template-columns:1fr;min-height:auto}.hero-visual{max-width:700px}.flow{grid-template-columns:1fr}.flow>b{justify-self:center;transform:rotate(90deg)}.audio-grid{grid-template-columns:1fr 1fr}}@media(max-width:760px){.site-header{align-items:flex-start;flex-direction:column;gap:.7rem}main{width:min(100% - 28px,var(--max))}.hero{padding-top:4.5rem}h1{font-size:clamp(3.4rem,16vw,5.2rem)}.setup-head,.future,.audio-head{grid-template-columns:1fr;gap:1.2rem}.setup-grid{grid-template-columns:1fr 1fr}.chapter{grid-template-columns:1fr;gap:1rem;padding:5rem 0}.rail{position:static;display:flex;gap:.7rem;align-items:baseline}.derivation summary em{display:none}}@media(max-width:520px){.setup-grid,.audio-grid{grid-template-columns:1fr}.chapter h2{font-size:2.6rem}nav{gap:.7rem}}


.portal-link {
  display: inline-block;
  margin-top: 1rem;
  padding-bottom: .18rem;
  border-bottom: 1px solid currentColor;
  text-decoration: none;
  font-family: "Iowan Old Style", Baskerville, Georgia, serif;
  font-size: 1.15rem;
}

.portal-link:hover {
  opacity: .65;
}


/* ---------- V4: discoverability + smaller typography ---------- */

.soundlab-nav {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .38rem .62rem;
  border: 1px solid rgba(140,60,44,.45);
  border-radius: 999px;
  color: var(--ink) !important;
  background: rgba(140,60,44,.07);
}

.soundlab-nav:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #f6f0e7 !important;
}

.soundlab-dot {
  font-size: .55rem;
  color: var(--accent);
}

.soundlab-nav:hover .soundlab-dot {
  color: #f6f0e7;
}

.home-title {
  max-width: 700px;
  font-size: clamp(2.7rem, 5.3vw, 4.9rem) !important;
  line-height: .98 !important;
}

.soundlab-hero-cta {
  display: inline-grid;
  grid-template-columns: auto 1fr;
  gap: .9rem;
  align-items: center;
  width: min(100%, 550px);
  margin-top: 2rem;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(140,60,44,.55);
  background: rgba(140,60,44,.065);
  text-decoration: none;
  transition: transform .18s ease, background .18s ease;
}

.soundlab-hero-cta:hover {
  transform: translateY(-2px);
  background: rgba(140,60,44,.11);
}

.soundlab-hero-arrow {
  font-family: "Iowan Old Style", Baskerville, Georgia, serif;
  font-size: 2rem;
  color: var(--accent);
}

.soundlab-hero-cta small,
.soundlab-hero-cta strong,
.soundlab-hero-cta em {
  display: block;
}

.soundlab-hero-cta small {
  margin-bottom: .18rem;
  font-size: .6rem;
  letter-spacing: .13em;
  color: var(--muted);
}

.soundlab-hero-cta strong {
  font-family: "Iowan Old Style", Baskerville, Georgia, serif;
  font-size: 1.35rem;
  font-weight: 500;
}

.soundlab-hero-cta em {
  margin-top: .15rem;
  color: var(--muted);
  font-size: .72rem;
  font-style: normal;
}

.soundlab-banner {
  display: grid;
  grid-template-columns: auto auto 1fr auto;
  align-items: center;
  gap: 1.2rem;
  width: 100%;
  margin: 0;
  padding: 1.15rem 1.25rem;
  background: var(--dark);
  color: #f3eee5;
  text-decoration: none;
  border-bottom: 1px solid var(--dark);
}

.soundlab-banner span {
  font-size: .64rem;
  letter-spacing: .1em;
  color: #bfb9ae;
}

.soundlab-banner strong {
  font-family: "Iowan Old Style", Baskerville, Georgia, serif;
  font-size: 1.35rem;
  font-weight: 500;
}

.soundlab-banner b {
  font-size: .78rem;
  font-weight: 600;
}

.soundlab-banner:hover b {
  transform: translateX(3px);
}

.chapter h2 {
  font-size: clamp(2rem, 3.8vw, 3.35rem) !important;
  line-height: 1.04 !important;
}

.setup h2,
.future-section h2 {
  font-size: clamp(1.8rem, 3.2vw, 2.8rem) !important;
}

@media (max-width: 760px) {
  .soundlab-banner {
    grid-template-columns: 1fr auto;
  }

  .soundlab-banner span:nth-of-type(2) {
    display: none;
  }
}


/* ---------- V5: Modern Music Nebula gateway ---------- */

.nebula-nav {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .38rem .62rem;
  border: 1px solid rgba(78, 70, 120, .55);
  border-radius: 999px;
  color: var(--ink) !important;
  background: rgba(78, 70, 120, .07);
}

.nebula-nav span {
  color: #6d62a8;
}

.nebula-nav:hover {
  background: #282436;
  color: #f4efe6 !important;
  border-color: #282436;
}

.nebula-gateway {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1.2rem;
  align-items: center;
  margin: 0;
  padding: 1.45rem 1.5rem;
  background:
    radial-gradient(circle at 12% 45%, rgba(138, 111, 255, .18), transparent 24%),
    radial-gradient(circle at 72% 30%, rgba(196, 92, 77, .12), transparent 28%),
    #181820;
  color: #f2ede6;
  text-decoration: none;
}

.nebula-gateway-mark {
  font-size: 2rem;
  color: #9b91da;
}

.nebula-gateway small,
.nebula-gateway strong,
.nebula-gateway p {
  display: block;
}

.nebula-gateway small {
  margin-bottom: .2rem;
  color: #aca6bd;
  font-size: .58rem;
  letter-spacing: .13em;
}

.nebula-gateway strong {
  font-family: "Iowan Old Style", Baskerville, Georgia, serif;
  font-size: 1.55rem;
  font-weight: 500;
}

.nebula-gateway p {
  max-width: 780px;
  margin: .25rem 0 0;
  color: #bdb8c7;
  font-size: .76rem;
  line-height: 1.45;
}

.nebula-gateway b {
  white-space: nowrap;
  font-size: .75rem;
  font-weight: 600;
}

.nebula-gateway:hover b {
  transform: translateX(4px);
}

@media (max-width: 760px) {
  .nebula-gateway {
    grid-template-columns: auto 1fr;
  }

  .nebula-gateway > b {
    grid-column: 2;
  }
}

/* ---------- V12: A Beautiful Error featured case ---------- */
.error-nav{display:inline-flex;align-items:center;padding:.38rem .62rem;border:1px solid rgba(123,45,38,.45);border-radius:999px;background:rgba(123,45,38,.055);color:var(--ink)!important}.error-nav:hover{background:#7b2d26;border-color:#7b2d26;color:#fff!important}
.beautiful-error-gateway{display:grid;grid-template-columns:1.06fr .94fr;gap:2rem;align-items:center;margin:0;padding:2.2rem 2.4rem;background:linear-gradient(120deg,#ede4d7 0%,#f5f0e8 56%,#dfd3c3 100%);border-bottom:1px solid var(--line);text-decoration:none;overflow:hidden}.beautiful-error-copy small,.beautiful-error-copy strong,.beautiful-error-copy p,.beautiful-error-copy em{display:block}.beautiful-error-copy small{font-size:.58rem;letter-spacing:.13em;color:#7b2d26}.beautiful-error-copy strong{margin:.15rem 0 .45rem;font:500 clamp(2.2rem,4vw,4rem)/1 "Iowan Old Style",Baskerville,Georgia,serif}.beautiful-error-copy p{max-width:720px;margin:.35rem 0;color:#555047;font-size:.82rem}.beautiful-error-result{display:flex;gap:.9rem;align-items:baseline;margin:1rem 0 .6rem}.beautiful-error-result b{font:500 1.5rem "Iowan Old Style",Baskerville,Georgia,serif;color:#7b2d26}.beautiful-error-result span{color:var(--muted);font-size:.64rem}.beautiful-error-copy em{color:#7b2d26;font-size:.69rem;font-style:normal}.beautiful-error-covers{position:relative;min-height:270px}.beautiful-error-covers img{position:absolute;width:42%;aspect-ratio:1/1;object-fit:cover;border:1px solid rgba(55,45,35,.2);box-shadow:0 16px 32px rgba(35,28,22,.15);transition:transform .2s ease}.bec-a{left:3%;top:18%;transform:rotate(-7deg)}.bec-b{left:31%;top:4%;transform:rotate(2deg);z-index:2}.bec-c{right:1%;top:20%;transform:rotate(7deg)}.beautiful-error-gateway:hover .bec-a{transform:translateY(-4px) rotate(-7deg)}.beautiful-error-gateway:hover .bec-b{transform:translateY(-7px) rotate(2deg)}.beautiful-error-gateway:hover .bec-c{transform:translateY(-4px) rotate(7deg)}
@media(max-width:820px){.beautiful-error-gateway{grid-template-columns:1fr;padding:1.5rem}.beautiful-error-covers{min-height:240px}.beautiful-error-result{display:grid;gap:.15rem}}


/* V32: short research scope note */
.scope-note{max-width:930px;margin-left:calc(125px + 3.2rem);padding:2.6rem 0 3rem;border-bottom:1px solid var(--line)}
.scope-note h2{margin:0 0 1rem;font:500 1.75rem/1.1 "Iowan Old Style",Baskerville,Georgia,serif;letter-spacing:-.02em}
.scope-note p{max-width:760px;margin:.45rem 0;font-size:.9rem;color:#4c4a45}
@media(max-width:760px){.scope-note{margin-left:0;padding:2.2rem 0 2.6rem}}