:root{color:#243c40;font-synthesis:none;background:#f5f0e4;font-family:Yu Gothic,Hiragino Kaku Gothic ProN,Meiryo,sans-serif}*{box-sizing:border-box}body{background:radial-gradient(at 12% 5%,#fffaf0,#0000 60%),#f5f0e4;margin:0}button{font:inherit;cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation}button:focus-visible,summary:focus-visible{outline-offset:4px;outline:3px solid #d8883d}button:disabled{opacity:.4;cursor:default}.app{max-width:950px;margin:auto;padding:24px 28px 12px}.masthead{justify-content:space-between;align-items:center;max-width:810px;margin:0 auto 20px;display:flex}.eyebrow{letter-spacing:.16em;color:#70857c;margin:0 0 7px;font-size:10px;font-weight:800}h1{letter-spacing:.04em;margin:0;font-size:30px;font-weight:850;line-height:1.2}.title-dots{color:#d7a441;margin-left:12px;font-size:20px}.quiet{color:#4e655e;background:#fffcf4;border:1px solid #d6dccd;border-radius:9px;min-height:44px;padding:8px 14px;font-size:12px}.layout{grid-template-columns:minmax(0,460px) 240px;justify-content:center;align-items:start;gap:40px;display:grid}.play-area{background:#fffdf7;border:1px solid #d9dece;border-radius:18px;min-width:0;overflow:hidden;box-shadow:0 15px 40px #4154470d}.hud{border-bottom:1px solid #e8ebdf;justify-content:space-between;align-items:center;gap:8px;padding:17px 22px 12px;display:flex}.hud>div{flex-direction:column;gap:4px;display:flex}.hud span{color:#70857c;font-size:10px}.hud strong{font-variant-numeric:tabular-nums;font-size:20px;line-height:1}.hud .timer strong{letter-spacing:-.04em;font-size:30px}.hud small{margin-left:5px;font-size:12px;font-weight:400}.board-wrap{position:relative}canvas{aspect-ratio:480/620;touch-action:none;-webkit-user-select:none;user-select:none;cursor:crosshair;outline:none;width:100%;height:auto;display:block}canvas:focus-visible{box-shadow:inset 0 0 0 3px #259581}.overlay{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#fffdf73b;place-items:center;padding:20px;display:grid;position:absolute;inset:0}.overlay[hidden]{display:none}.overlay-card{text-align:center;background:#fffdf7f5;border:1px solid #dce2d4;border-radius:16px;width:100%;max-width:325px;padding:28px 22px 20px;box-shadow:0 16px 42px #243c4012}.overlay h2{letter-spacing:.015em;margin:10px 0 12px;font-size:26px}.overlay p{font-size:13px;line-height:1.9}.primary{color:#fff;background:#21836f;border:0;border-radius:9px;justify-content:space-between;align-items:center;gap:20px;width:100%;min-height:50px;margin:22px 0 8px;padding:15px 22px;font-size:15px;font-weight:700;display:flex;box-shadow:0 4px #166454}.primary:active{transform:translateY(2px);box-shadow:0 2px #166454}.overlay .small-note{color:#768778;margin:12px 0 0;font-size:10px}.board-footer{background:#f1f5e9;border-top:1px solid #e3e8d7;align-items:center;gap:8px;min-height:44px;padding:8px 15px;display:flex}.board-footer p{margin:0;font-size:11px;line-height:1.5}.mint-dot{background:#26977b;border-radius:50%;flex-shrink:0;width:6px;height:6px}.guide{padding-top:22px}.guide h2{margin:10px 0 28px;font-size:22px}.instruction{margin:0 0 22px}.instruction svg{width:96px;height:48px;margin-bottom:8px;display:block}.instruction p,.rule-note{color:#63746a;margin:0;font-size:12px;line-height:1.9}.instruction b{color:#243c40;font-size:14px}.rule-note{border-top:1px solid #d9dece;padding:16px 0}.best{background:#ece7d9;border-radius:9px;justify-content:space-between;align-items:center;margin:8px 0 20px;padding:14px;display:flex}.best span{color:#6a7b71;font-size:11px}.best strong{font-variant-numeric:tabular-nums;font-size:18px}details{color:#6a7b71;font-size:11px;line-height:1.8}summary{cursor:pointer;min-height:32px}footer{color:#93a090;text-align:center;padding:15px 0;font-size:10px}@media (min-width:760px){.layout{grid-template-columns:minmax(0,clamp(300px,77.42dvh - 224.518px,440px)) 240px}.masthead{max-width:760px}}@media (max-width:759px){.app{max-width:470px;padding:14px 12px 8px}.masthead{margin-bottom:14px}h1{font-size:25px}.eyebrow{font-size:9px}.layout{display:block}.hud{padding:14px 18px 11px}.guide{grid-template-columns:1fr 1fr;gap:12px 18px;padding:22px 10px 0;display:grid}.guide>.eyebrow,.guide>h2{display:none}.instruction{margin:0}.instruction svg{width:72px;height:36px}.instruction p{font-size:11px}.rule-note,.best,details{grid-column:1/-1}.best{margin:0}.rule-note{padding:10px 0 0;font-size:11px}.hud .timer strong{font-size:27px}.overlay-card{padding:22px 17px 17px}.overlay h2{font-size:24px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto}}