@font-face{font-family:"Fraunces";font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/fraunces-normal-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Fraunces";font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/fraunces-normal-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Fraunces";font-style:italic;font-weight:100 900;font-display:swap;src:url(fonts/fraunces-italic-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Fraunces";font-style:italic;font-weight:100 900;font-display:swap;src:url(fonts/fraunces-italic-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Plex Mono";font-style:normal;font-weight:400;font-display:swap;src:url(fonts/IBMPlexMono-400-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Plex Mono";font-style:normal;font-weight:400;font-display:swap;src:url(fonts/IBMPlexMono-400-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Plex Mono";font-style:normal;font-weight:600;font-display:swap;src:url(fonts/IBMPlexMono-600-latin.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Plex Mono";font-style:normal;font-weight:600;font-display:swap;src:url(fonts/IBMPlexMono-600-latin-ext.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

:root{
  --bg:#f6efe2;--bg2:#ece3d2;--card:#fbf6ea;--ink:#1d1511;--ink2:#3a2f27;--muted:#54463a;
  --line:#cbbd9f;--line-soft:#dccfb4;--accent:#8c1d22;--accent-ink:#fff;--gold:#5a3d00;
  --serif:"Fraunces",Georgia,"Times New Roman",serif;--mono:"Plex Mono",ui-monospace,Menlo,monospace;
  --bar:3rem;color-scheme:light
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0c0812;--bg2:#120c1b;--card:#160f20;--ink:#f1e7d3;--ink2:#dacdb5;--muted:#bfb29c;
  --line:#33263f;--line-soft:#241a2e;--accent:#ffb84d;--accent-ink:#1b1000;--gold:#ffd27a;color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0c0812;--bg2:#120c1b;--card:#160f20;--ink:#f1e7d3;--ink2:#dacdb5;--muted:#bfb29c;
  --line:#33263f;--line-soft:#241a2e;--accent:#ffb84d;--accent-ink:#1b1000;--gold:#ffd27a;color-scheme:dark}

*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.1rem/1.62 var(--serif);font-optical-sizing:auto;text-rendering:optimizeLegibility;overflow-x:hidden}
a{color:var(--accent);text-underline-offset:.16em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-999px;top:0;background:var(--card);padding:.5rem 1rem;z-index:80}
.skip:focus{left:8px;top:8px}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
section,.step{scroll-margin-top:calc(var(--bar) + 8px)}
h1,h2,h3{font-family:var(--serif);line-height:1.1;margin:0;text-wrap:balance;font-optical-sizing:auto}
button,select,input{font:inherit}
.num,.mono{font-family:var(--mono);font-variant-numeric:tabular-nums lining-nums}

/* top bar */
.topbar{position:sticky;top:0;z-index:50;height:var(--bar);display:flex;align-items:center;gap:.7rem;padding:0 max(16px,env(safe-area-inset-left));
  background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line-soft);font:500 .86rem/1 var(--mono)}
.home{display:inline-flex;align-items:center;gap:.45rem;color:var(--ink);text-decoration:none;white-space:nowrap;font-weight:600}
.home-ico{color:var(--accent)}
.topnav{display:flex;gap:1rem;overflow-x:auto;scrollbar-width:none;min-width:0;flex:0 1 auto;margin-left:.6rem}
.topnav::-webkit-scrollbar{display:none}
.topnav a{color:var(--ink2);text-decoration:none;white-space:nowrap;padding:.95rem .1rem}
.topnav a:hover{color:var(--accent)}
.spacer{flex:1}
.chip{display:inline-flex;align-items:center;min-height:32px;padding:0 .7rem;border:1px solid var(--line);border-radius:999px;color:var(--ink);text-decoration:none;font-weight:600}
.icon-btn{width:34px;height:34px;display:inline-grid;place-items:center;border:1px solid var(--line);border-radius:999px;background:transparent;color:var(--ink);cursor:pointer}
.progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none}
.progress span{display:block;height:100%;width:100%;transform-origin:left;transform:scaleX(0);background:var(--accent)}
.progress i{position:absolute;top:-5px;left:6px;width:12px;height:12px;margin-left:-6px;will-change:transform;color:var(--accent)}
.progress i svg{display:block}
@media (max-width:900px){.topnav{display:none}}
@media (pointer:coarse){.chip,.icon-btn{min-height:44px;min-width:44px}.icon-btn{width:44px;height:44px}}

/* the hall (dark in both themes) */
.hero{--h-ink:#f6ecd8;--h-ink2:#e2d4bb;--h-gold:#ffc766;--h-line:rgba(255,214,150,.28);
  position:relative;isolation:isolate;min-height:calc(100svh - var(--bar));display:flex;flex-direction:column;background:#0a0610;color:var(--h-ink);overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;background:linear-gradient(to bottom,rgba(10,6,16,.94) 0%,rgba(10,6,16,.8) 34%,rgba(10,6,16,0) 58%)}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;display:block;z-index:0;touch-action:manipulation}
.hero .copy{position:relative;z-index:2;padding:clamp(1rem,3.4vh,2rem) max(16px,env(safe-area-inset-left)) 0;max-width:74rem;width:100%;margin:0 auto;pointer-events:none}
.hero .copy a,.hero .copy button{pointer-events:auto}
.kicker{font:600 .76rem/1.3 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--h-gold);margin:0 0 .7rem}
.hero h1{font-weight:340;font-size:clamp(1.95rem,5.6vw,4.3rem);letter-spacing:-.022em;line-height:1.02;max-width:19ch;font-variation-settings:"opsz" 144;text-shadow:0 2px 24px #000a}
.hero h1 em{font-style:italic;color:var(--h-gold);font-weight:320}
.claim{font-size:clamp(1.02rem,2vw,1.4rem);line-height:1.38;max-width:31rem;margin:.9rem 0 0;color:var(--h-ink2);font-weight:380;text-shadow:0 1px 14px #000c}
.hallspace{position:relative;z-index:1;flex:1 1 auto;min-height:12rem;pointer-events:none}
.mic{position:relative;max-width:74rem;width:100%;margin:.7rem auto 0;padding:0 max(16px,env(safe-area-inset-left));pointer-events:none}
.mic-label{display:flex;justify-content:space-between;gap:.8rem;font:500 .72rem/1.2 var(--mono);color:var(--h-ink2);letter-spacing:.03em;margin-bottom:.25rem;text-shadow:0 1px 8px #000}
.mic canvas{position:relative;inset:auto;display:block;width:100%;height:3.6rem;border-top:1px solid var(--h-line);border-bottom:1px solid var(--h-line)}
.base{position:relative;z-index:3;margin-top:auto;background:linear-gradient(to top,#0a0610 0%,#0a0610e6 55%,rgba(10,6,16,0) 100%)}
.hud{min-width:0;position:relative;max-width:74rem;width:100%;margin:0 auto;padding:.7rem max(16px,env(safe-area-inset-left)) clamp(.9rem,2.4vh,1.4rem);display:grid;gap:.7rem}
.gauges{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:.8rem 1.2rem}
.gauge{font:500 .74rem/1.2 var(--mono);color:var(--h-ink2);letter-spacing:.04em}
.gauge b{font-weight:600;color:var(--h-ink)}
.gauge .bar{display:block;height:.7rem;border-radius:99px;background:rgba(255,235,200,.2);margin-top:.35rem;overflow:hidden}
.gauge .bar i{display:block;height:100%;width:100%;transform-origin:left;transform:scaleX(0);border-radius:99px;background:linear-gradient(90deg,#ffb347,#ffe29a)}
.gauge.loud .bar i{background:linear-gradient(90deg,#ff7a59,#ffc15e)}
.status{margin:0;font:500 .98rem/1.35 var(--serif);color:var(--h-ink);min-height:2.7em;text-shadow:0 1px 12px #000}
.controls{display:flex;flex-wrap:nowrap;gap:.5rem;align-items:center;min-width:0}
.cbtn{white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:48px;padding:0 1.2rem;border-radius:999px;border:1.5px solid var(--h-gold);background:transparent;color:var(--h-ink);font:600 .9rem/1 var(--mono);cursor:pointer;touch-action:manipulation;user-select:none;-webkit-user-select:none}
.cbtn:hover{background:rgba(255,199,102,.14)}
.cbtn.main{background:var(--h-gold);color:#1b1000;border-color:var(--h-gold);min-width:9.5rem;font-size:1rem}
.cbtn.main:hover{filter:brightness(1.07);background:var(--h-gold)}
.cbtn.main.on{box-shadow:0 0 0 4px rgba(255,199,102,.35)}
.cbtn[data-on="true"]{background:rgba(255,199,102,.2)}
.cbtn.louder{border-color:#ff9a73;touch-action:none}
.cbtn.louder.holding{background:#ff9a73;color:#1b0600}
.cbtn.icon{width:48px;min-width:48px;padding:0;border-color:var(--h-line);color:var(--h-ink2)}
.cbtn.icon[data-on="true"]{color:var(--h-gold)}
.cbtn .mute{display:none}.cbtn[data-on="false"] .w1{display:none}.cbtn[data-on="false"] .mute{display:inline}
.cbtn.snd{padding:0 .9rem;gap:.4rem;border-color:var(--h-line);color:var(--h-ink2);font-weight:500;font-size:.82rem}
.cbtn.snd[data-on="true"]{color:var(--h-gold);border-color:var(--h-gold)}
.cbtn.snd.attn{border-color:var(--h-gold);color:var(--h-ink);animation:attn 2.6s ease-in-out infinite}
@keyframes attn{0%,100%{box-shadow:0 0 0 0 rgba(255,199,102,0)}50%{box-shadow:0 0 0 6px rgba(255,199,102,.28)}}
@media (prefers-reduced-motion:reduce){.cbtn.snd.attn{animation:none}}
.cbtn.icon .ic-pause{display:none}#playhall[data-on="true"] .ic-play{display:none}#playhall[data-on="true"] .ic-pause{display:inline}
.grow{flex:1 1 0}
.tip{position:absolute;left:50%;top:.2rem;transform:translateX(-50%);margin:0;padding:.35rem .8rem;border-radius:99px;background:rgba(10,6,16,.78);border:1px solid var(--h-line);font:500 .78rem/1.2 var(--mono);color:var(--h-ink);white-space:nowrap;transition:opacity .6s;pointer-events:none}
.tip.gone{opacity:0}
.how{margin:0;font:400 .8rem/1.4 var(--mono);color:var(--h-ink2)}
.streak{font:600 .78rem/1 var(--mono);color:var(--h-gold);min-height:1em}
@media (min-width:980px){
  .hero{--hallpad:0}
  .hallspace{position:absolute;left:0;right:0;top:0;bottom:0;min-height:0}
  .hero .copy{padding-top:clamp(1.2rem,5vh,3rem)}
  .hero h1{max-width:17ch}
  .gauges{max-width:36rem}
}
@media (max-width:979px){.hero h1{font-size:clamp(1.75rem,8.4vw,2.7rem)}.claim{font-size:1rem}}
@media (max-width:979px) and (max-height:700px){.kicker{display:none}.hero h1{font-size:clamp(1.5rem,7.2vw,2rem)}.claim{font-size:.9rem;margin-top:.45rem}.hallspace{min-height:9rem}.copy{padding-top:.7rem}}
@media (max-width:420px){.cbtn.main{min-width:0;flex:1 1 auto;padding:0 .9rem}.cbtn{padding:0 .85rem}.cbtn.icon{padding:0}.hud{gap:.45rem;padding-top:.45rem}.mic canvas{height:2.6rem}.status{font-size:.9rem;min-height:2.5em}.gauge{font-size:.68rem}.mic{margin-top:.4rem}.mic-label{font-size:.66rem}#louderhint{display:none}}

/* reading sections */
.page{position:relative;z-index:2;background:var(--bg)}
.s{max-width:46rem;margin:0 auto;padding:4.4rem 16px 0}
.s.wide{max-width:64rem}
.s h2{font-size:clamp(1.7rem,4.6vw,2.7rem);font-weight:340;letter-spacing:-.018em;margin-bottom:1.1rem}
.s h2 .anchor,.s h3 .anchor{color:inherit;text-decoration:none}
.s h2 .anchor:hover{text-decoration:underline}
.s h3{font-size:1.25rem;font-weight:500;margin:1.8rem 0 .4rem}
.s p{margin:.9rem 0}
.s p.lead{font-size:1.28rem;line-height:1.5;color:var(--ink2)}
.eyebrow{font:600 .76rem/1.3 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin:0 0 .6rem}
.note{font:400 .84rem/1.5 var(--mono);color:var(--muted)}
.pull{font:300 clamp(1.5rem,3.6vw,2.3rem)/1.2 var(--serif);letter-spacing:-.012em;max-width:30ch;margin:2.2rem 0;font-style:italic;color:var(--ink)}
.pull em{color:var(--accent)}
.facts{list-style:none;margin:1.2rem 0;padding:0;counter-reset:f;display:grid;gap:.9rem}
.facts li{counter-increment:f;display:grid;grid-template-columns:2.4rem 1fr;gap:.6rem;align-items:baseline}
.facts li::before{content:counter(f);font:600 1.5rem/1 var(--serif);color:var(--accent);font-style:italic}
.facts li p{margin:0}
.fig{margin:2rem 0}
.fig img{display:block;width:100%;height:auto;border-radius:6px}
.fig figcaption{font:400 .82rem/1.5 var(--mono);color:var(--muted);margin-top:.6rem}
.two{display:grid;gap:1.6rem;margin:1.6rem 0}
@media (min-width:760px){.two{grid-template-columns:1fr 1fr}}
.quote{margin:1.4rem 0;padding:.2rem 0 .2rem 1.1rem;border-left:3px solid var(--accent);font-style:italic;font-size:1.12rem;line-height:1.5}
.quote cite{display:block;margin-top:.5rem;font:400 .8rem/1.4 var(--mono);font-style:normal;color:var(--muted)}
table.t{width:100%;border-collapse:collapse;font:400 .9rem/1.45 var(--serif);margin:1.2rem 0}
table.t caption{text-align:left;color:var(--muted);padding:.4rem 0;font:400 .8rem/1.4 var(--mono)}
table.t th,table.t td{padding:.65rem .6rem;border-bottom:1px solid var(--line-soft);text-align:left;vertical-align:top}
table.t th{font:600 .78rem/1.3 var(--mono);color:var(--ink2);border-bottom:1.5px solid var(--line);letter-spacing:.04em}
.tablewrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.src{padding-left:1.1rem}.src li{margin:.7rem 0;font-size:.95rem;line-height:1.5}
.src a{word-break:break-word}

/* the clapping test */
.test{border:1px solid var(--line);border-radius:16px;background:var(--card);padding:1.2rem 1.2rem 1.3rem;margin:1.6rem 0}
.test h3{margin:0 0 .3rem;font-size:1.3rem;font-weight:450}
.test .steps{display:grid;gap:1rem;margin-top:1rem}
@media (min-width:700px){.test .steps{grid-template-columns:1fr 1fr}}
.tstep{border:1px solid var(--line-soft);border-radius:12px;padding:.9rem 1rem;background:var(--bg)}
.tstep h4{margin:0 0 .3rem;font:600 .78rem/1.3 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.tstep p{margin:.2rem 0 .7rem;font-size:1rem;line-height:1.4}
.tbtn{display:inline-flex;align-items:center;justify-content:center;min-height:56px;width:100%;border-radius:12px;border:1.5px solid var(--accent);background:transparent;color:var(--ink);font:600 .95rem/1.2 var(--mono);cursor:pointer;touch-action:manipulation;user-select:none;-webkit-user-select:none}
.tbtn:hover:not(:disabled){background:color-mix(in srgb,var(--accent) 14%,transparent)}
.tbtn:disabled{opacity:.55;cursor:default}
.tbtn.live{background:var(--accent);color:var(--accent-ink)}
.tout{font:500 .9rem/1.4 var(--mono);margin-top:.6rem;color:var(--ink2);min-height:1.4em}
.tres{margin-top:1rem;font-size:1.05rem;line-height:1.5}
.tres b{font-weight:600}
.test .row{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center;margin-top:.9rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:44px;padding:0 1.1rem;border-radius:999px;border:1.5px solid var(--accent);background:transparent;color:var(--ink);font:600 .85rem/1 var(--mono);cursor:pointer;text-decoration:none}
.btn:hover{background:color-mix(in srgb,var(--accent) 14%,transparent)}
.btn.solid{background:var(--accent);color:var(--accent-ink)}

/* share + footer */
.share-row{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap;margin:2.4rem 0 0}
.share-label{font:500 .8rem/1 var(--mono);color:var(--muted);margin-right:.3rem}
.sh{width:40px;height:40px;display:inline-grid;place-items:center;border:1px solid var(--line-soft);border-radius:50%;background:transparent;color:var(--ink);cursor:pointer;text-decoration:none}
.sh:hover,.sh:focus-visible{border-color:var(--accent);color:var(--accent)}
.copied{margin:0;font:400 .8rem/1 var(--mono);color:var(--muted);flex-basis:100%;min-height:1em}
@media (pointer:coarse){.sh{width:44px;height:44px}}
.moment{margin-top:1rem}
.foot{max-width:46rem;margin:0 auto;padding:3.2rem 16px 4rem;font:400 .86rem/1.6 var(--mono);color:var(--muted)}
.foot a{color:var(--ink2)}
html:not(.js) .controls,html:not(.js) .gauges,html:not(.js) .hud .status,html:not(.js) .mic{display:none}
.still{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
html.js .still{display:none}
.fig.narrow{max-width:24rem;margin-left:auto;margin-right:auto}
.fig .cr a{color:inherit}
.fig.plot svg{display:block;width:100%;height:auto}
.sv-axis{stroke:var(--line);stroke-width:1.4}
.sv-slow{fill:color-mix(in srgb,var(--accent) 30%,transparent);stroke:var(--accent);stroke-width:2.4}
.sv-fast{fill:color-mix(in srgb,var(--ink) 12%,transparent);stroke:var(--ink2);stroke-width:2}
.sv-txt{fill:var(--ink2);font:500 13px var(--mono)}
.sv-soft{fill:var(--muted);font:400 12px var(--mono)}
.sv-lab{fill:var(--ink);font:600 13px var(--mono)}
.sv-slowt{fill:var(--accent)}
@media (max-width:979px){.hero::before{background:linear-gradient(to bottom,rgba(10,6,16,.9) 0%,rgba(10,6,16,0) 36%)}}
@media (max-width:360px){.cbtn{padding:0 .65rem;font-size:.8rem}.cbtn.main{font-size:.88rem}.cbtn.icon{width:44px;min-width:44px;padding:0}.controls{gap:.35rem}}
.pullnote{margin:-1.4rem 0 1.6rem}
@media (max-width:480px){.cbtn.snd{width:44px;min-width:44px;padding:0}.cbtn.snd .lab{display:none}.cbtn.main{flex:1 1 0;min-width:0}.cbtn.louder{flex:1 1 0;min-width:0;padding:0 .5rem}.grow{display:none}}
:root[data-theme="dark"] .fig img{filter:brightness(.9)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .fig img{filter:brightness(.9)}}
table.t th[scope="row"]{font:500 .92rem/1.45 var(--serif);letter-spacing:0;color:var(--ink);width:44%}