:root{
  --paper:#fff; --wash:#eaf3fb; --wash-deep:#d8e9f7;
  --ink:#0d3a63; --ink-soft:#5b7f9e; --line:#c6dcee;
  --accent:#0f7ad1; --cyan:#37b6e9;
  --mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --jp:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP","Yu Gothic",sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0}
body{
  font-family:var(--jp); color:var(--ink); line-height:1.7;
  background:radial-gradient(1200px 620px at 50% -10%,#fff 0%,rgba(255,255,255,0) 62%),
             linear-gradient(178deg,var(--wash),var(--wash-deep));
  background-attachment:fixed; min-height:100vh;
  -webkit-text-size-adjust:100%; padding:0 0 max(48px,env(safe-area-inset-bottom));
}
.wrap{max-width:840px;margin:0 auto;padding:0 16px}
header{padding:38px 0 22px}
.eyebrow{font-family:var(--mono);font-size:10.5px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent);margin:0 0 12px;display:flex;align-items:center;gap:10px}
.eyebrow::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent)}
.wordmark{font-size:clamp(30px,8.4vw,46px);line-height:1;letter-spacing:-.035em;font-weight:600;
  font-family:var(--mono);
  background:linear-gradient(96deg,#0b3358 12%,#1a8fd6 96%);-webkit-background-clip:text;background-clip:text;color:transparent}
h1{margin:6px 0 0;font-size:clamp(16px,4.2vw,20px);font-weight:700;letter-spacing:.04em;color:var(--ink)}
.sub{margin:11px 0 0;font-size:13.5px;color:var(--ink-soft)}
.caution{margin:12px 0 0;padding:11px 13px;font-size:12.5px;line-height:1.7;color:#2c5a80;
  background:rgba(255,255,255,.72);border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:4px 10px 10px 4px}
.caution b{color:var(--accent)}
.card{background:var(--paper);border:1px solid var(--line);border-radius:16px;
  box-shadow:0 1px 0 #fff inset,0 10px 30px -18px rgba(13,58,99,.5);padding:22px 18px;margin:0 0 16px}
@media(min-width:640px){.card{padding:30px 32px;margin:0 0 18px}}
.card>h2{margin:0 0 12px;font-size:11px;font-family:var(--mono);letter-spacing:.16em;
  text-transform:uppercase;color:var(--ink-soft);font-weight:600}

.stage{position:relative;border-radius:12px;overflow:hidden;background:#eef4f9;touch-action:pan-y;cursor:ew-resize}
.stage canvas{display:block;width:100%;height:auto}
.divider{position:absolute;top:0;bottom:0;width:2px;background:#fff;box-shadow:0 0 0 1px rgba(13,58,99,.25);pointer-events:none;transform:translateX(-1px)}
.knob{position:absolute;top:50%;left:50%;width:34px;height:34px;margin:-17px 0 0 -17px;border-radius:50%;
  background:#fff;box-shadow:0 2px 10px rgba(13,58,99,.35);display:grid;place-items:center;font-size:11px;color:var(--accent);font-family:var(--mono)}
.tag{position:absolute;top:9px;font-family:var(--mono);font-size:10px;letter-spacing:.12em;
  background:rgba(255,255,255,.88);color:var(--ink);padding:4px 8px;border-radius:999px;pointer-events:none;backdrop-filter:blur(4px)}
.tag.l{left:9px}.tag.r{right:9px}
.plates{position:absolute;inset:0;display:grid;grid-template:1fr 1fr/1fr 1fr;pointer-events:none}
.plates[hidden]{display:none}
.plates i{align-self:start;justify-self:start;margin:7px;font-style:normal;font-family:var(--mono);
  font-size:10px;letter-spacing:.1em;background:rgba(255,255,255,.9);color:var(--ink);padding:3px 7px;border-radius:999px}
.viewbar{display:flex;gap:6px;margin-top:12px}
.viewbar button{flex:1;font-family:var(--mono);font-size:11px;letter-spacing:.08em;padding:8px 4px;
  border:1px solid var(--line);background:#f7fbfe;color:var(--ink-soft);border-radius:9px;cursor:pointer}
@media(max-width:520px){
  .viewbar{display:grid;grid-template-columns:1fr 1fr}
  .viewbar button{padding:10px 4px}
}
.viewbar button[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:#fff}

.phase{margin:18px 0 0;font-size:clamp(19px,5.2vw,25px);font-weight:700;letter-spacing:-.02em;line-height:1.3}
.phase span{color:var(--accent)}
.timeline{display:grid;grid-template-columns:66px 1fr;gap:8px;margin-top:14px}
.pnames{display:grid;grid-template-rows:repeat(4,1fr);height:64px}
.pnames i{display:flex;align-items:center;justify-content:flex-end;font-style:normal;
  font-family:var(--jp);font-size:10px;color:var(--ink-soft);letter-spacing:0;white-space:nowrap}
.track{position:relative;height:64px;border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.track canvas{display:block;width:100%;height:100%}
.ends{display:flex;justify-content:space-between;font-family:var(--mono);font-size:9.5px;
  color:var(--ink-soft);margin-top:6px;letter-spacing:.1em}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;background:transparent;margin:10px 0 0;display:block}
input[type=range]::-webkit-slider-runnable-track{height:3px;background:var(--line);border-radius:2px}
input[type=range]::-moz-range-track{height:3px;background:var(--line);border-radius:2px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:26px;height:26px;border-radius:50%;
  background:#fff;border:2px solid var(--accent);margin-top:-12px;box-shadow:0 2px 8px rgba(13,58,99,.3);cursor:pointer}
input[type=range]::-moz-range-thumb{width:24px;height:24px;border-radius:50%;background:#fff;
  border:2px solid var(--accent);box-shadow:0 2px 8px rgba(13,58,99,.3);cursor:pointer}

.filerow{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:14px}
.filerow button{font-size:13px;font-weight:600;padding:12px 10px;border-radius:11px;text-align:center;
  border:1px solid var(--line);background:#f7fbfe;color:var(--ink);cursor:pointer;font-family:var(--jp)}
#pick{border-color:transparent;color:#fff;font-weight:700;
  background:linear-gradient(96deg,#0d9d68,#19b57f);
  box-shadow:0 6px 16px -8px rgba(9,110,74,.9)}
#pick:active{transform:translateY(1px)}
.primary{display:flex;width:100%;align-items:center;justify-content:center;gap:9px;
  margin-top:9px;padding:13px 14px;border:0;border-radius:11px;cursor:pointer;
  font-family:var(--jp);font-size:14px;font-weight:700;letter-spacing:.01em;color:#fff;
  background:linear-gradient(96deg,#1177cf,#1a9ae0);
  box-shadow:0 6px 16px -8px rgba(13,90,160,.9)}
.primary:active{transform:translateY(1px)}
.primary svg{flex:none}
.filerow input[type=file]{position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;opacity:0}
.status{font-size:11.5px;color:var(--ink-soft);margin:9px 0 0;min-height:1.4em}

.why>h2{font-family:var(--jp);font-size:17.5px;font-weight:700;letter-spacing:-.01em;
  text-transform:none;color:var(--ink);margin:0 0 12px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.why h3{margin:20px 0 7px;font-size:14.5px;font-weight:700;letter-spacing:-.01em;color:var(--ink)}
.why h3:first-of-type{margin-top:14px}
.why p{font-size:13.5px;margin:0 0 11px}
.why p:last-child{margin-bottom:0}
.why b{color:var(--accent);font-weight:700}
.why sup a{color:var(--accent);text-decoration:none;font-size:10px;padding:0 1px}
.refs{margin:0;padding:0 0 0 1.6em;font-size:12px;color:var(--ink)}
.refs li{margin:0 0 12px}
.refs li a{display:block;color:var(--accent);word-break:break-all;font-family:var(--mono);font-size:10.5px;margin:2px 0}
.refs li span{display:block;color:var(--ink-soft);font-size:11.5px;line-height:1.65}
.refs i{color:var(--ink-soft)}
.note{margin:14px 0 0;padding:12px 0 0;border-top:1px solid var(--line);font-size:11.5px;color:var(--ink-soft)}
footer{font-size:11.5px;color:var(--ink-soft);padding:6px 2px 0}
.foot-links{display:flex;flex-wrap:wrap;align-items:center;gap:5px 9px;
  margin:16px 0 0;padding:14px 0 0;border-top:1px solid var(--line);font-size:12px}
.foot-links a{color:var(--ink-soft);text-decoration:none}
.foot-links a:hover{color:var(--accent);text-decoration:underline}
.foot-links span{opacity:.45}
.sheet{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;
  padding:max(16px,env(safe-area-inset-top)) 16px max(16px,env(safe-area-inset-bottom));
  background:rgba(11,42,70,.62);backdrop-filter:blur(6px);
  opacity:0;transition:opacity .24s ease}
.sheet[hidden]{display:none}
.sheet.on{opacity:1}
.sheet-in{display:flex;flex-direction:column;background:var(--paper);border-radius:16px;padding:16px;
  max-width:min(520px,100%);width:100%;max-height:100%;
  box-shadow:0 24px 60px -20px rgba(11,42,70,.7);
  opacity:0;transform:translateY(14px) scale(.975);
  transition:opacity .24s ease, transform .34s cubic-bezier(.16,1,.3,1)}
.sheet.on .sheet-in{opacity:1;transform:none}
/* 画像だけを可変にして、見出し・注記・ボタンは常に見える高さを確保する。
   min-height:0 が無いとフレックス子要素が縮まず、縦長画像でボタンが画面外に出る。 */
.sheet-fig{flex:1 1 auto;min-height:0;display:flex;align-items:center;justify-content:center}
.sheet-t{flex:none;margin:0 0 12px;font-size:13.5px;font-weight:700;text-align:center;color:var(--ink)}
.sheet-in img{display:block;max-width:100%;max-height:100%;width:auto;height:auto;
  object-fit:contain;border-radius:10px;border:1px solid var(--line)}
.sheet-hint{flex:none;margin:11px 0 0;font-size:12px;line-height:1.65;color:var(--ink-soft);text-align:center}
.sheet-btns{flex:none;margin-top:13px}
.sheet-btns .primary{margin-top:0}
.sheet-sub{display:flex;gap:8px;margin-top:8px}
.sheet-sub a,.sheet-sub button{flex:1;text-align:center;font-family:var(--jp);font-size:13px;
  padding:11px 8px;border-radius:10px;border:1px solid var(--line);background:#f7fbfe;
  color:var(--ink);cursor:pointer;text-decoration:none}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}