:root{
  --bg:#f4f5f7; --card:#ffffff; --ink:#1d2330; --muted:#5d6678; --line:#d9dde5;
  --accent:#2c5fd3; --accent-ink:#ffffff; --ok:#1f8a4c; --ng:#c0392b; --warn:#a86400;
  --frame:#ffffff; --sel:#eaf0ff;
  --fs:clamp(110px, min(25vh, 42vw), 300px);
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI","Noto Sans JP","Hiragino Sans","Yu Gothic",sans-serif}
.demo-bar{background:#1d2330;color:#dfe5f2;font-size:12.5px;padding:6px 16px;text-align:center}
.demo-bar a{color:#9fc0ff}
.wrap{max-width:860px;margin:0 auto;padding:20px 16px 56px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px 24px 28px}
h1{font-size:1.45rem;line-height:1.35;margin:0 0 14px}
h2{font-size:1.1rem;margin:22px 0 8px}
p{margin:0 0 12px}
.muted{color:var(--muted);font-size:.92rem}
.btn{appearance:none;border:0;border-radius:9px;background:var(--accent);color:var(--accent-ink);font:inherit;font-weight:600;padding:11px 24px;cursor:pointer;min-height:44px}
.btn:hover{filter:brightness(1.06)}
.btn:disabled{background:#b9c0cf;cursor:not-allowed;filter:none}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.row{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}
.opts{display:grid;gap:8px;margin:14px 0 6px}
.opt{display:flex;gap:10px;align-items:flex-start;padding:10px 14px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;min-height:44px}
.opt:hover{border-color:#9db4ee}
.opt input{margin-top:5px;accent-color:var(--accent)}
.opt.sel{background:var(--sel);border-color:var(--accent)}
.opt input:disabled+span{opacity:.5}
.opt.other{align-items:center}
.opt.other input[type=text]{flex:1;min-width:0;border:1px solid var(--line);border-radius:6px;padding:5px 8px;font:inherit}
textarea{width:100%;min-height:120px;border:1px solid var(--line);border-radius:10px;padding:10px;font:inherit;resize:vertical}
.legend{display:flex;gap:16px;flex-wrap:wrap;margin:8px 0 14px;font-size:.93rem}
.sw{display:inline-block;width:14px;height:14px;border:1px solid #000;vertical-align:-2px;margin-right:6px}
.reminder{background:#fff8e6;border:1px solid #f0d58a;border-radius:10px;padding:10px 14px;margin-bottom:14px;font-size:.95rem}
.err{background:#fdecea;border:1px solid #f0b4ad;color:#8a2218;border-radius:10px;padding:10px 14px;margin-bottom:14px}
.okbox{background:#eaf7ef;border:1px solid #a9d9bc;color:#175c35;border-radius:10px;padding:10px 14px;margin-bottom:14px}
.head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.head .q{font-weight:700;font-size:1.05rem}
.bar{height:6px;background:#e3e7ef;border-radius:99px;overflow:hidden;margin:8px 0 14px}
.bar>i{display:block;height:100%;background:var(--accent);transition:width .25s}
.task{font-size:1.02rem;font-weight:600;margin:4px 0 12px}
.task.attn{color:#8a4b00}
.grid{display:grid;gap:10px;justify-items:center}
.pair{display:flex;gap:18px;justify-content:center}
.fig{display:flex;flex-direction:column;align-items:center;gap:4px}
.fig .cap{font-weight:700;font-size:.95rem}
.frame{width:var(--fs);aspect-ratio:1/1;background:var(--frame);border:1px solid #9aa3b5;border-radius:6px;display:flex;align-items:center;justify-content:center;cursor:zoom-in;position:relative;overflow:hidden}
.frame img{max-width:100%;max-height:100%;object-fit:contain;display:block}
.frame .zoom{position:absolute;right:5px;bottom:5px;background:rgba(29,35,48,.78);color:#fff;font-size:11px;padding:1px 7px;border-radius:99px;pointer-events:none}
.frame .ph[hidden]{display:none}
.frame .ph{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#8a93a6;font-size:.85rem;background:#eef0f4}
.modal{position:fixed;inset:0;background:rgba(15,20,30,.82);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:50;padding:16px;cursor:zoom-out}
.modal .big{width:min(92vw,86vh);aspect-ratio:1/1;background:#fff;border-radius:6px;display:flex;align-items:center;justify-content:center}
.modal .big img{width:100%;height:100%;object-fit:contain}
.wrap.wide{max-width:1060px}
.trial{display:grid;gap:8px}
@media (min-width:900px){
  .trial{grid-template-columns:auto minmax(280px,1fr);gap:34px;align-items:start}
  .trial .right{padding-top:26px}
}
.modal .t{color:#fff;margin-bottom:8px;font-weight:700}
.modal .h{color:#c8d0e0;margin-top:8px;font-size:.85rem}
.toast{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);background:#1d2330;color:#fff;padding:9px 16px;border-radius:99px;font-size:.9rem;z-index:60}
.mono{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.88rem}
@media (max-width:520px){.card{padding:18px 14px 22px}.pair{gap:10px}}