:root{
  --bg:#F2EFE7; --bg2:#E9E5DA; --ink:#151412; --mute:#6A675F; --line:rgba(21,20,18,.13); --line2:rgba(21,20,18,.3);
  --panel:rgba(242,239,231,.78); --scheme:light;
  --k2:#2E9C90; --k3:#D2505A; --acc:#D2505A;
  --ease:cubic-bezier(.2,.7,.1,1); --ease2:cubic-bezier(.7,0,.2,1);
  --gut:clamp(16px,4vw,56px);
  --mono:"IBM Plex Mono",ui-monospace,monospace; --serif:"Instrument Serif",serif;
  --mincho:"Zen Old Mincho","Hiragino Mincho ProN","Yu Mincho",serif;
  --sans:"Zen Kaku Gothic New","Hiragino Sans","Yu Gothic",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0A0B0D; --bg2:#121316; --ink:#ECEAE3; --mute:#8E8B84; --line:rgba(236,234,227,.11); --line2:rgba(236,234,227,.28);
    --panel:rgba(10,11,13,.72); --scheme:dark; --k2:#5CCFC1; --k3:#E4606A; --acc:#E4606A; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0A0B0D; --bg2:#121316; --ink:#ECEAE3; --mute:#8E8B84; --line:rgba(236,234,227,.11); --line2:rgba(236,234,227,.28);
  --panel:rgba(10,11,13,.72); --scheme:dark; --k2:#5CCFC1; --k3:#E4606A; --acc:#E4606A; color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:400 16px/1.9 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden;
  padding:0 max(0px,env(safe-area-inset-right)) 0 max(0px,env(safe-area-inset-left));transition:background .5s var(--ease),color .5s var(--ease)}
::selection{background:var(--acc);color:#fff}
a{color:inherit}
button{font:inherit;color:inherit}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:fixed;left:16px;top:-60px;z-index:60;background:var(--ink);color:var(--bg);padding:10px 14px;text-decoration:none}
.skip:focus{top:16px}
:focus-visible{outline:2px solid var(--acc);outline-offset:3px}
.eyebrow{font:500 11px/1.4 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--mute);margin:0}
.eyebrow i{font-style:normal;color:var(--acc)}
.eyebrow .no{color:var(--ink);margin-right:10px}

/* 幕 */
.curtain{position:fixed;inset:0;z-index:80;background:var(--ink);color:var(--bg);display:grid;place-items:end start;padding:var(--gut);
  transition:transform 1s var(--ease2);will-change:transform}
.curtain.up{transform:translateY(-101%)}
.curtain.gone{display:none}
.curtain-in{display:grid;grid-template-columns:auto auto;align-items:end;gap:4px 12px;width:min(520px,100%)}
.curtain .eyebrow{grid-column:1/-1;color:inherit;opacity:.6}
.curtain b{font:400 clamp(72px,14vw,180px)/.85 var(--serif);font-variant-numeric:tabular-nums}
.curtain .of{font:500 12px/1 var(--mono);letter-spacing:.12em;opacity:.6;padding-bottom:14px}
.curtain-bar{grid-column:1/-1;display:block;height:1px;background:rgba(127,127,127,.35);margin-top:18px}
.curtain-bar i{display:block;height:100%;width:0;background:currentColor;transition:width .2s linear}

/* 舞台 */
#world{position:fixed;inset:0;width:100%;height:100%;z-index:0;display:block;transition:opacity .35s var(--ease);touch-action:pan-y}
#world.dip{opacity:.15}
#world.far{opacity:.12}
#world.is-key{cursor:pointer}
.overlay{position:fixed;inset:0;width:100%;height:100%;z-index:1;pointer-events:none}
.overlay line{stroke:var(--acc);stroke-width:1.5;stroke-dasharray:6 5;display:none}
.grain{position:fixed;inset:-50%;z-index:2;pointer-events:none;opacity:.05;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* ナビ */
.nav{position:fixed;left:0;right:0;top:0;z-index:40;display:flex;align-items:center;gap:20px;
  padding:max(12px,env(safe-area-inset-top)) max(var(--gut),env(safe-area-inset-right)) 12px max(var(--gut),env(safe-area-inset-left));
  background:linear-gradient(var(--bg),color-mix(in srgb,var(--bg) 0%,transparent));transition:background .5s}
.brand{display:flex;align-items:baseline;gap:4px;text-decoration:none;font:400 26px/1 var(--serif)}
.brand i{font-style:normal;color:var(--acc);margin:0 2px}
.links{display:flex;gap:4px;margin-left:auto}
.links a{text-decoration:none;font:500 13px/1 var(--sans);padding:10px 12px;border-radius:999px;color:var(--mute);transition:color .25s,background .25s}
.links a span{font:500 10px/1 var(--mono);margin-right:6px;opacity:.7}
.links a:hover,.links a.on{color:var(--ink);background:color-mix(in srgb,var(--ink) 7%,transparent)}
.navtools{display:flex;gap:6px}
.pill{appearance:none;border:1px solid var(--line2);background:var(--panel);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-radius:999px;
  height:38px;padding:0 14px;display:inline-flex;align-items:center;gap:8px;cursor:pointer;font:500 12px/1 var(--mono);letter-spacing:.06em;
  transition:border-color .25s,background .25s,color .25s,transform .25s var(--ease)}
.pill:hover{border-color:var(--ink)}
.pill:active{transform:scale(.97)}
.pill .dot{width:7px;height:7px;border-radius:50%;border:1px solid currentColor;transition:background .25s}
.pill[aria-pressed="true"] .dot{background:var(--acc);border-color:var(--acc)}
.pill.big{height:44px;font-family:var(--sans);font-size:14px;letter-spacing:0}
.pill.ghost{background:transparent}
.progress{position:absolute;left:0;bottom:0;height:1px;width:100%;background:var(--ink);transform-origin:0 0;transform:scaleX(0)}

/* 共通の節 */
main{position:relative;z-index:3;pointer-events:none}
main a,main button,main input,main label,main .col,main .result,main .xsec,main .cards,main .playbar,main .foot,main .layers,main .hero-meta{pointer-events:auto}
.sec{position:relative}
.wrap{padding:0 var(--gut);max-width:1600px;margin:0 auto}
.pin{height:calc(var(--len) * 1svh)}
.pin-in{position:sticky;top:0;height:100svh;padding:96px var(--gut) 40px;max-width:1600px;margin:0 auto;display:flex;flex-direction:column;justify-content:center}
.flow{padding:18vh 0 14vh}
.col{max-width:500px}
.col p{margin:0 0 1em;font-size:16px}
.title{font:500 clamp(34px,4.6vw,64px)/1.18 var(--mincho);letter-spacing:.01em;margin:16px 0 24px;text-wrap:balance}
.note{font-size:13px!important;color:var(--mute)}
.ln{display:inline-block;width:22px;height:0;border-top:2px solid var(--ink);vertical-align:middle;margin-right:8px}
.ln.k2{border-color:var(--k2)} .ln.k3{border-color:var(--k3)}

/* ヒーロー */
.hero{min-height:100svh;display:flex;align-items:flex-end;padding:0 0 clamp(28px,6vh,72px)}
.hero .wrap{width:100%}
.display{font:500 clamp(54px,7.6vw,132px)/1.04 var(--mincho);letter-spacing:-.02em;margin:18px 0 26px}
.display.sm{font-size:clamp(40px,7vw,112px)}
.display .line{display:block;overflow:hidden;padding-bottom:.06em}
.display .ch{display:inline-block;transform:translateY(105%);opacity:0;transition:transform 1.1s var(--ease),opacity .6s var(--ease);transition-delay:calc(var(--i) * 45ms + 120ms)}
.ready .display .ch{transform:none;opacity:1}
.lead{font-size:clamp(15px,1.25vw,18px);max-width:34em;margin:0 0 32px}
.reveal-load{opacity:0;transform:translateY(14px);transition:opacity .9s var(--ease) .7s,transform .9s var(--ease) .7s}
.ready .reveal-load{opacity:1;transform:none}
.hero-meta{display:flex;flex-wrap:wrap;gap:20px 48px;align-items:flex-end;justify-content:space-between;border-top:1px solid var(--line2);padding-top:18px}
.hero-meta dl{display:flex;gap:36px;margin:0;flex-wrap:wrap}
.hero-meta dt{font:500 10px/1 var(--mono);letter-spacing:.14em;color:var(--mute);margin-bottom:8px}
.hero-meta dd{margin:0;font-size:14px;font-weight:500}
.sun{display:grid;grid-template-columns:auto;gap:4px;min-width:min(280px,100%)}
.sun label{display:flex;align-items:baseline;justify-content:space-between;gap:12px;font-size:13px}
.sun label b{font:500 13px/1 var(--mono)}
.sun small{font-size:11px;color:var(--mute)}
.scrollcue{position:absolute;right:var(--gut);bottom:200px;display:grid;justify-items:center;gap:10px;text-decoration:none;font:500 10px/1 var(--mono);letter-spacing:.2em;color:var(--mute);writing-mode:vertical-rl}
.scrollcue i{width:1px;height:64px;background:linear-gradient(var(--ink),transparent);animation:cue 2.4s var(--ease) infinite}
@keyframes cue{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* 範囲スライダー */
input[type=range]{appearance:none;-webkit-appearance:none;width:100%;height:28px;background:transparent;cursor:pointer;margin:0}
input[type=range]::-webkit-slider-runnable-track{height:1px;background:var(--line2)}
input[type=range]::-moz-range-track{height:1px;background:var(--line2)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--bg);border:1.5px solid var(--ink);margin-top:-9px;transition:transform .2s}
input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:var(--bg);border:1.5px solid var(--ink)}
input[type=range]:active::-webkit-slider-thumb{transform:scale(1.25)}

/* 流れる刻印 */
.ticker{position:relative;z-index:3;border-block:1px solid var(--line2);overflow:hidden;background:var(--bg);pointer-events:none}
.ticker-in{display:flex;width:max-content;gap:0;animation:tick 60s linear infinite}
.ticker-in span{font:400 clamp(22px,2.6vw,36px)/1 var(--serif);padding:18px 22px;border-right:1px solid var(--line);white-space:nowrap}
.ticker-in span.m{font:500 12px/1 var(--mono);letter-spacing:.12em;color:var(--mute);display:flex;align-items:center}
.ticker-in span.x{color:var(--acc);font-style:italic}
@keyframes tick{to{transform:translateX(-50%)}}

/* 01 */
.stats{list-style:none;padding:0;margin:36px 0 0;display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line2)}
.stats li{padding:16px 14px 0 0;display:grid;gap:4px}
.stats li+li{border-left:1px solid var(--line);padding-left:14px}
.stats b{font:400 clamp(44px,5vw,72px)/1 var(--serif);font-variant-numeric:tabular-nums}
.stats small{font-size:.5em}
.stats span{font-size:12px;color:var(--mute);line-height:1.5}

/* 02 */
.col-top{margin-bottom:auto}
.layers{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(6,1fr);border-top:1px solid var(--line2)}
.layers li{padding:14px 12px 0 0;font:500 14px/1.4 var(--sans);color:var(--mute);transition:color .4s var(--ease);position:relative}
.layers li::before{content:"";position:absolute;left:0;top:-1px;height:2px;width:100%;background:var(--ink);transform:scaleX(0);transform-origin:0 0;transition:transform .5s var(--ease)}
.layers li.on{color:var(--ink)}
.layers li.on::before{transform:scaleX(1)}
.layers span{display:block;font:500 10px/1 var(--mono);letter-spacing:.12em;margin-bottom:8px;color:var(--acc)}
.layers small{display:block;font-size:11px;font-weight:400;color:var(--mute);margin-top:4px}
.pin-meter{position:absolute;left:var(--gut);bottom:150px;font:400 clamp(40px,5vw,72px)/1 var(--serif);margin:0;color:var(--mute)}
.pin-meter span{color:var(--ink);font-variant-numeric:tabular-nums}

/* 03 */
.two{display:grid;grid-template-columns:minmax(0,500px) minmax(0,1fr);gap:clamp(24px,5vw,80px);align-items:start}
.dims{border-collapse:collapse;margin-top:28px;width:100%;font-size:14px}
.dims caption{text-align:left;font:500 11px/1.4 var(--mono);letter-spacing:.1em;color:var(--mute);padding-bottom:10px}
.dims th,.dims td{border-top:1px solid var(--line2);padding:10px 8px 10px 0;text-align:left;font-weight:500}
.dims td{font:400 15px/1 var(--mono);font-variant-numeric:tabular-nums}
.dims tr.sub th,.dims tr.sub td{border-top-style:dashed;color:var(--mute);padding-top:7px;padding-bottom:7px}
.dims tr.sub th{padding-left:30px;font-size:12px}
.dims tr.sub td{font-size:13px}
#soundSeg button{padding:0 12px}
.specs{margin-top:56px;max-width:880px}
.specs table{border-collapse:collapse;width:100%;font-size:13px;line-height:1.5}
.specs caption{text-align:left;font:500 11px/1.4 var(--mono);letter-spacing:.1em;color:var(--mute);padding-bottom:10px}
.specs th,.specs td{border-top:1px solid var(--line2);padding:9px 12px 9px 0;text-align:left;vertical-align:top;font-weight:400}
.specs thead th{font-weight:500}
.specs tbody th{color:var(--mute);font-size:12px;width:34%}
.specs td{font-variant-numeric:tabular-nums}
.specs .fine a{color:inherit}
.xsec{margin:0;background:var(--panel);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line2);padding:16px 18px}
#height .pin-in{display:grid;align-content:center}
#height .xsec{margin-top:clamp(150px,27vh,280px)}
.xsec-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:10px}
.xsec figcaption{font:500 15px/1.4 var(--sans)}
.xsec figcaption .eyebrow{margin-right:10px}
.xsec output{font:400 28px/1 var(--serif);font-variant-numeric:tabular-nums}
#xsec{display:block;width:100%;height:clamp(240px,36vh,400px);border:1px solid var(--line);touch-action:pan-y;cursor:zoom-in}
.xsec-ctl{display:grid;grid-template-columns:1fr auto;gap:10px 18px;align-items:center;margin-top:12px}
.steps{display:flex;gap:4px}
.steps button{appearance:none;border:1px solid var(--line2);background:transparent;border-radius:999px;height:34px;padding:0 12px;font-size:12px;cursor:pointer;transition:background .25s,color .25s}
.steps button.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.hint-sm{font-size:11px;color:var(--mute);margin:8px 0 0}

/* 04 */
.playbar{display:flex;flex-wrap:wrap;align-items:center;gap:12px 16px;border-top:1px solid var(--line2);padding-top:16px;background:linear-gradient(transparent,var(--panel) 30%);}
.typed{flex:1 1 260px;min-width:0;display:flex;align-items:baseline;gap:14px}
.typed b{font:400 clamp(26px,3vw,44px)/1.1 var(--serif);white-space:pre;overflow:hidden;text-overflow:clip;min-height:1.1em;direction:rtl;text-align:left;unicode-bidi:plaintext}
.typed b::after{content:"";display:inline-block;width:2px;height:.9em;background:var(--acc);margin-left:4px;vertical-align:-.1em;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.seg{display:inline-flex;border:1px solid var(--line2);border-radius:999px;padding:3px;background:var(--panel)}
.seg button{appearance:none;border:0;background:transparent;border-radius:999px;height:36px;padding:0 16px;cursor:pointer;font-size:13px;font-weight:500;transition:background .25s,color .25s}
.seg button[aria-checked="true"]{background:var(--ink);color:var(--bg)}
.splitctl{display:flex;align-items:center;gap:10px;font:500 11px/1 var(--mono);min-width:260px}
.splitctl[hidden]{display:none}
.splitctl input{flex:1}
.fine{font-size:11px;color:var(--mute);margin:10px 0 0}

/* 05 */
.quiz{display:grid;gap:18px;margin-top:8px}
.quiz fieldset{border:0;border-top:1px solid var(--line2);margin:0;padding:14px 0 0;display:flex;flex-wrap:wrap;gap:8px}
.quiz legend{float:left;width:100%;font-size:13px;color:var(--mute);margin-bottom:8px;padding:0}
.quiz label{position:relative;display:inline-flex;align-items:center;min-height:42px;padding:8px 16px;border:1px solid var(--line2);border-radius:999px;cursor:pointer;font-size:14px;line-height:1.4;
  background:var(--panel);transition:background .25s,color .25s,border-color .25s}
.quiz label:hover{border-color:var(--ink)}
.quiz input{position:absolute;opacity:0;pointer-events:none}
.quiz label:has(input:checked){background:var(--ink);color:var(--bg);border-color:var(--ink)}
.quiz label:has(input:focus-visible){outline:2px solid var(--acc);outline-offset:3px}
.result{position:sticky;top:110px;background:var(--panel);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line2);padding:22px;margin-top:40vh;max-width:520px;justify-self:end;width:100%}
.meter{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;font:500 11px/1 var(--mono);margin:16px 0}
.meter span:first-child{color:var(--k2)} .meter span:last-child{color:var(--k3)}
.meter i{position:relative;height:2px;background:linear-gradient(90deg,var(--k2),var(--line2) 50%,var(--k3))}
.meter b{position:absolute;top:50%;left:50%;width:14px;height:14px;margin:-7px 0 0 -7px;border-radius:50%;background:var(--bg);border:2px solid var(--ink);transition:left .8s var(--ease)}
.verdict{font:500 clamp(22px,2.2vw,30px)/1.4 var(--mincho);margin:0 0 12px}
.why{margin:0 0 18px;padding:0;list-style:none;display:grid;gap:6px;font-size:14px;line-height:1.7}
.why li{padding-left:18px;position:relative}
.why li::before{content:"";position:absolute;left:0;top:.75em;width:8px;height:1px;background:var(--ink)}
.why li.k2::before{background:var(--k2);height:2px} .why li.k3::before{background:var(--k3);height:2px}
.result-tools{display:flex;gap:8px;flex-wrap:wrap}

/* 終わり */
.end{padding:24vh 0 0;min-height:100svh;display:flex;align-items:flex-end}
.end .wrap{width:100%}
.cards{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line2);margin-top:12px}
.card{position:relative;display:grid;gap:6px;padding:22px 22px 26px 0;text-decoration:none;background:linear-gradient(var(--panel),var(--panel)) no-repeat 0 0/100% 0;transition:background-size .5s var(--ease)}
.card+.card{border-left:1px solid var(--line);padding-left:22px}
.card b{font:400 clamp(28px,3vw,44px)/1.1 var(--serif)}
.card small{font-size:13px;color:var(--mute)}
.card i{position:absolute;right:16px;top:20px;font-style:normal;font-size:20px;transition:transform .4s var(--ease)}
.card:hover{background-size:100% 100%}
.card:hover i{transform:translate(4px,-4px)}
.foot{display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between;border-top:1px solid var(--line2);margin-top:48px;padding:18px 0 max(24px,env(safe-area-inset-bottom));font-size:12px;color:var(--mute)}
.foot p{margin:0}

/* 出現 */
[data-reveal]{opacity:0;transform:translateY(28px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
[data-reveal].in{opacity:1;transform:none}

.toast{position:fixed;left:50%;bottom:max(24px,env(safe-area-inset-bottom));z-index:70;transform:translate(-50%,20px);opacity:0;visibility:hidden;background:var(--ink);color:var(--bg);
  padding:12px 18px;border-radius:999px;font-size:13px;transition:transform .5s var(--ease);pointer-events:none}
.toast.on{transform:translate(-50%,0);opacity:1;visibility:visible}
.toast{transition:transform .5s var(--ease),opacity .4s,visibility 0s .5s}
.toast.on{transition:transform .5s var(--ease),opacity .4s,visibility 0s}

/* 狭い画面 */
@media (max-width:900px){
  .links{display:none}
  .navtools{margin-left:auto}
  .two{grid-template-columns:1fr}
  #height{height:auto}
  #height .pin-in{position:relative;height:auto;display:block;padding-top:14vh;padding-bottom:10vh}
  #height .xsec{margin-top:30vh}
  .result{position:relative;top:auto;margin-top:24px;justify-self:stretch;max-width:none}
  .layers{grid-template-columns:repeat(3,1fr);row-gap:12px}
  .cards{grid-template-columns:1fr}
  .card+.card{border-left:0;border-top:1px solid var(--line);padding-left:0}
}
@media (max-width:640px){
  body{font-size:15px}
  .pin-in{padding:76px var(--gut) 24px;justify-content:flex-end}
  .pin-in .col{background:var(--panel);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);margin:0 calc(var(--gut) * -1);padding:18px var(--gut) 8px}
  .col-top{margin-bottom:0}
  #open .pin-in{justify-content:space-between}
  #play .pin-in{justify-content:flex-start}
  #play .playbar{margin-top:auto}
  #open .col p,#play .col p{display:none}
  #open .pin-in .col,#play .pin-in .col{background:linear-gradient(var(--bg) 60%,transparent);backdrop-filter:none;-webkit-backdrop-filter:none}
  .layers{background:linear-gradient(transparent,var(--bg) 22%);margin:0 calc(var(--gut) * -1);padding:20px var(--gut) 0}
  .layers small{display:none}
  .title{font-size:30px;margin:10px 0 14px}
  .display{font-size:clamp(48px,14.5vw,72px);margin:12px 0 16px}
  .hero-meta dl{gap:20px}
  .scrollcue{display:none}
  .end{padding-top:46svh}
  .stats{margin-top:18px}
  .stats b{font-size:40px}
  .pin-meter{top:72px;font-size:32px}
  .playbar{margin:0 calc(var(--gut) * -1);padding:14px var(--gut) 0;background:var(--bg)}
  .typed b{font-size:24px}
  .splitctl{min-width:0;flex:1 1 100%}
  .xsec{padding:12px;margin-left:calc(var(--gut) * -1);margin-right:calc(var(--gut) * -1);border-left:0;border-right:0}
  .xsec-ctl{grid-template-columns:1fr}
  .steps{flex-wrap:wrap}
  .cards .card{padding-right:40px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important;animation:none!important;transition-delay:0s!important}
  .display .ch,.reveal-load,[data-reveal]{opacity:1;transform:none}
}