/* Layout: one-screen notebook page — slim stat strip on top, the あみだ board fills the rest, cards float over it. Deliberately single-theme (方眼ノート). */
:root{
  --paper:#f6f8f4;
  --grid:#d8e4e6;
  --lead:#33363d;
  --forge:#4652c4;
  --red:#d9342b;
  --teal:#138a7e;
  --gold:#c99200;
  --guard:#2c5a93;
  --warp:#9a3fc0;
  --pink:#ec9fb0;
  --muted:#7b8086;
  --card:#ffffff;
  --wood:#e7c79a;
  --pencil:#f2c230;
  --f-display:"Klee One","Hiragino Maru Gothic ProN","Yu Gothic",cursive;
  --f-body:"Zen Kaku Gothic New","Hiragino Sans","Yu Gothic",system-ui,sans-serif;
  color-scheme:light;
}
html,body{height:100%}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-size:14px;background:var(--paper);color:var(--lead);font-family:var(--f-body);overflow:hidden}
.app{height:100%;display:flex;flex-direction:column;gap:6px;padding-block:8px;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));box-sizing:border-box;max-width:960px;margin:0 auto}
header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:6px 16px}
h1{font-family:var(--f-display);font-weight:600;font-size:clamp(15px,3.4vw,19px);margin:0;letter-spacing:.02em;text-wrap:balance;cursor:default;user-select:none}
h1 b{color:var(--red);font-weight:600}
.stats{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-variant-numeric:tabular-nums}
.stat{display:flex;align-items:baseline;gap:5px}
.stat small,.lbl{font-size:11px;color:var(--muted);letter-spacing:.08em}
.stat span{font-family:var(--f-display);font-weight:600;font-size:18px}
.lines{display:flex;flex-direction:column;gap:2px;min-width:70px}
.lines-row{display:flex;align-items:center;gap:3px;height:16px}
.lines-row b{font-family:var(--f-display);font-size:16px}
.pc{width:5px;height:15px;display:block;background:linear-gradient(180deg,var(--lead) 0 2px,var(--wood) 2px 4px,var(--pencil) 4px 13px,var(--pink) 13px);clip-path:polygon(50% 0,100% 18%,100% 100%,0 100%,0 18%);border-radius:0 0 1px 1px}
.pc.half{height:8px}
.regen{height:2px;background:var(--grid);border-radius:1px;overflow:hidden}
.regen i{display:block;height:100%;width:0;background:var(--forge)}
.pen{font-size:12px;min-width:84px;color:var(--muted)}
.pen.bad{color:var(--red);font-weight:700}
.tools{display:flex;border:1px solid var(--grid);border-radius:4px;overflow:hidden}
.tools button{font:inherit;font-size:12px;border:0;background:var(--card);color:var(--lead);padding:4px 8px;cursor:pointer}
.tools button+button{border-left:1px solid var(--grid)}
.tools button[aria-pressed="true"]{background:var(--forge);color:#fff}
.mini{font:inherit;font-size:12px;background:none;border:1px solid var(--grid);border-radius:4px;padding:3px 7px;color:var(--muted);cursor:pointer}
.mini:focus-visible,.btn:focus-visible,.tools button:focus-visible,.sb:focus-visible{outline:2px solid var(--forge);outline-offset:2px}
#wrap{position:relative;flex:1;min-height:380px;border-radius:4px;overflow:hidden;box-shadow:0 0 0 1px var(--grid)}
canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;display:block}
@media (pointer:fine){canvas.drawing{cursor:none}}
.ov{position:absolute;inset:0;display:grid;place-items:center;padding:16px;background:rgba(246,248,244,.6);overflow:auto}
.card{background:var(--card);max-width:440px;width:100%;box-sizing:border-box;padding:22px 22px 18px;border-radius:3px;
  box-shadow:0 1px 0 var(--grid),0 10px 30px rgba(40,50,70,.16);transform:rotate(-.5deg);display:flex;flex-direction:column;gap:12px;
  background-image:linear-gradient(transparent 27px,var(--grid) 28px);background-size:100% 28px;background-position:0 10px}
.card.wide{max-width:700px;transform:none;max-height:100%;overflow:auto;background-image:none}
.card h2{font-family:var(--f-display);font-weight:600;font-size:24px;margin:0;line-height:1.3;text-wrap:balance}
.card h2 em{font-style:normal;color:var(--red)}
.card h3{font-family:var(--f-display);font-weight:600;font-size:15px;margin:6px 0 0}
.card p,.card li{font-size:14px;line-height:28px;margin:0}
.card ul{margin:0;padding-left:1.1em}
.eyebrow{font-size:12px;letter-spacing:.12em;color:var(--muted)}
.card .row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.btn{font-family:var(--f-display);font-weight:600;font-size:17px;padding:8px 20px;border:2px solid var(--lead);background:var(--pencil);color:var(--lead);
  border-radius:3px;cursor:pointer;box-shadow:3px 3px 0 var(--lead);transition:transform .08s,box-shadow .08s}
.btn.alt{background:var(--card)}
a.btn{display:inline-block;text-decoration:none}
.btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--lead)}
.sub{color:var(--muted);font-size:12px}
.tag{display:inline-block;font-size:12px;padding:0 6px;border-radius:2px;line-height:20px;background:var(--paper);box-shadow:inset 0 0 0 1px var(--grid)}
.tag.cheat{background:#fff0c9;box-shadow:inset 0 0 0 1px var(--gold)}
.grid{display:grid;grid-template-columns:repeat(10,1fr);gap:5px}
.sb{font-family:var(--f-display);font-weight:600;font-size:13px;aspect-ratio:1;max-width:100%;border:1.5px solid var(--grid);background:var(--card);color:var(--lead);border-radius:3px;cursor:pointer;padding:0;position:relative;font-variant-numeric:tabular-nums}
.sb.boss{border-color:var(--guard)}
.sb.done{background:#eef3fb}
.sb.done::after{content:"✓";position:absolute;right:2px;top:-1px;font-size:10px;color:var(--forge)}
.sb:disabled{color:#c3c7cc;cursor:not-allowed;background:var(--paper)}
.sb.final{border-color:var(--red);color:var(--red)}
footer{font-size:12px;color:var(--muted);text-align:center;line-height:1.5}
.demo{background:#fff4d6;box-shadow:inset 3px 0 0 var(--gold);padding:4px 10px;border-radius:2px;font-size:13px!important;line-height:1.6!important}
.packs{display:flex;flex-direction:column;gap:8px}
.pack{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;padding:10px 12px;border:1.5px solid var(--grid);border-radius:3px;background:var(--card)}
.pack.best{border-color:var(--gold);background:#fffaf0}
.pk-main{display:flex;flex-direction:column;gap:2px;min-width:0;flex:1 1 220px}
.pk-main b{font-family:var(--f-display);font-size:16px}
.pk-main .sub{line-height:1.5}
.pk-buy{display:flex;align-items:center;gap:10px}
.price{font-family:var(--f-display);font-weight:600;font-size:20px;font-variant-numeric:tabular-nums}
.price-line{font-family:var(--f-display);font-weight:600;font-size:30px!important;line-height:1.3!important}
.btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.auth{display:flex;flex-direction:column;gap:10px}
.auth .field{justify-content:space-between}
.auth .field input{flex:1 1 12em;width:auto}
.form-msg{color:var(--red);font-size:13px!important;line-height:1.5!important;min-height:1.5em}
.form-msg.ok{color:var(--teal)}
.card code{font-size:13px;background:var(--paper);padding:1px 5px;border-radius:2px}
.page{min-height:100%;display:grid;place-items:center;padding:24px max(16px,env(safe-area-inset-right,0px)) 24px max(16px,env(safe-area-inset-left,0px));box-sizing:border-box}
body.scroll{overflow:auto}
.doc{max-width:720px;margin:0 auto;padding-block:28px 48px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));line-height:1.85;font-size:15px}
.doc h1{font-family:var(--f-display);font-weight:600;font-size:28px;margin:8px 0 4px;text-wrap:balance}
.doc h2{font-family:var(--f-display);font-weight:600;font-size:19px;margin:32px 0 8px;padding-bottom:4px;border-bottom:1.5px solid var(--grid)}
.doc p,.doc li{max-width:65ch}
.doc ol,.doc ul{padding-left:1.4em}
.doc a{color:var(--forge)}
.doc-meta{color:var(--muted);font-size:13px;margin-top:0}
.doc-back{font-size:14px}
.doc table{width:100%;border-collapse:collapse;font-size:14px;line-height:1.6;display:block;overflow-x:auto}
.doc th,.doc td{border:1px solid var(--grid);padding:6px 10px;text-align:left;vertical-align:top}
.doc th{background:var(--card);font-weight:700;white-space:nowrap}
.doc table.kv{display:table}
.doc table.kv th{width:11em;white-space:normal}
@media (max-width:520px){.doc table.kv,.doc table.kv tbody,.doc table.kv tr,.doc table.kv th,.doc table.kv td{display:block;width:auto}.doc table.kv th{border-bottom:0}}
.legal{font-size:12px;color:var(--muted)}
.legal a{color:var(--forge)}
.field{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:14px}
.field input{font:inherit;font-size:15px;padding:5px 8px;border:1.5px solid var(--grid);border-radius:3px;background:var(--card);color:var(--lead);min-width:0;width:9em}
.field input:focus-visible{outline:2px solid var(--forge);outline-offset:1px}
.modes{display:flex;flex-direction:column;gap:6px}
.mode{display:block;padding:6px 8px;border:1.5px solid var(--grid);border-radius:3px;cursor:pointer;line-height:1.5;font-size:14px;background:var(--card)}
.mode:has(input:checked){border-color:var(--forge);background:#eef0fb}
.mode .sub{line-height:1.5}
.plist{display:flex;flex-direction:column;gap:4px;margin:0;padding:0;list-style:none}
.plist li{display:flex;gap:8px;align-items:center;font-size:14px;line-height:24px}
.plist i{width:12px;height:12px;border-radius:50%;display:block;flex:none}
.card select{font:inherit;font-size:14px;padding:4px 6px;border:1.5px solid var(--grid);border-radius:3px;background:var(--card);color:var(--lead)}
@media (max-width:520px){.grid{grid-template-columns:repeat(5,1fr)}}
@media (prefers-reduced-motion:reduce){.card{transform:none}.btn{transition:none}}