:root{color-scheme:light;--ink:#193f45;--muted:#6a7d7b;--paper:#f6f4ee;--mint:#d7e8cf;--line:#d9dfd7;--accent:#e5ae5f;--tile:#4e9390}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Noto Sans JP",sans-serif}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}a{color:inherit}button:disabled{cursor:default}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #ba6e28;outline-offset:4px}[hidden]{display:none!important}.skip{position:absolute;top:-100px;z-index:5;background:white;padding:16px}.skip:focus{top:8px}.shell{max-width:1080px;margin:auto;padding:26px 40px 30px}.top{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-bottom:26px;border-bottom:1px solid var(--line)}.back{text-decoration:none;font-size:13px;font-weight:600}.pilot{font-size:11px;color:var(--muted)}.layout{display:grid;grid-template-columns:1fr 440px;gap:76px;align-items:start;padding:48px 0}.intro{padding-top:26px}.eyebrow{font-size:10px;letter-spacing:.16em;font-weight:750;display:flex;gap:10px;align-items:center}.mini-mark{font-size:24px;color:#658b76;line-height:1}h1{font-size:46px;line-height:1.3;letter-spacing:-.06em;margin:22px 0 20px;font-weight:900}h1 span{display:block;font-size:21px;margin-top:10px;letter-spacing:.08em}.lead{font-size:15px;line-height:1.95;color:var(--muted);margin:0 0 32px}.mode-switch{display:flex;gap:5px;padding:5px;border:1px solid var(--line);border-radius:15px}.mode-switch button{border:0;background:transparent;width:50%;border-radius:10px;padding:13px 6px;font-size:14px;font-weight:750;transition:background .15s}.mode-switch small{display:block;font-size:10px;font-weight:400;margin-top:5px;opacity:.75}.mode-switch [aria-pressed=true]{background:var(--ink);color:#fff}.mode-note{font-size:12px;line-height:1.6;min-height:38px;color:var(--muted)}.rules{font-size:12px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:24px 0;line-height:1.9}.rules summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;padding:15px 0;font-weight:650}.rules summary::-webkit-details-marker{display:none}.rules p{margin:0 0 13px;color:var(--muted)}.board-link{font-size:13px;font-weight:700;text-decoration:none;display:flex;justify-content:space-between}.private-note{font-size:11px;line-height:1.8;color:var(--muted);margin-top:18px}.game{min-width:0;background:#fffdfa;border:1px solid #e4e7de;border-radius:26px;padding:23px;box-shadow:0 16px 50px #193f4508}.score-row{display:flex;align-items:center;justify-content:space-between;padding:0 4px 12px}.stat-label{font-size:10px;color:var(--muted);display:block;letter-spacing:.07em;font-weight:650}.score-row strong{display:block;font-variant-numeric:tabular-nums;font-size:38px;line-height:1.25;letter-spacing:-.04em}.score-row .best{text-align:right}.best strong{font-size:24px}.game-status{font-size:11px;display:flex;justify-content:space-between;margin:0 3px 12px;color:var(--muted);min-height:20px;align-items:center}#combo{font-weight:650;color:#567862}.board{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:4px;padding:10px;background:#193f45;border-radius:16px;touch-action:manipulation;aspect-ratio:1;outline-offset:4px;position:relative}.cell{min-width:0;min-height:0;aspect-ratio:1;border:0;padding:0;background:#31555a;border-radius:5px;position:relative;transition:background .12s,box-shadow .12s}.tile{background:var(--tile);box-shadow:inset 0 2px 0 #ffffff30,inset 0 -2px 0 #00000013}.tone-0{--tile:#e1b16c}.tone-1{--tile:#83af98}.tone-2{--tile:#87b8bf}.tone-3{--tile:#b2a0c9}.tone-4{--tile:#d58e78}.cell.preview{background:#a9ccb3;box-shadow:inset 0 0 0 2px #f2fff1}.cell.clear-preview{box-shadow:inset 0 0 0 2px #ffe2a5}.cell.invalid{box-shadow:inset 0 0 0 2px #f0aa9d}.cell:focus-visible{outline:2px solid #fff;outline-offset:-3px;z-index:2}.cell.just-cleared{animation:clear-pop .4s ease}.cell.just-placed{animation:place-pop .18s ease}.feedback{font-size:12px;text-align:center;color:var(--muted);line-height:1.7;min-height:40px;margin:14px 0 5px}.tray{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;min-height:96px}.piece{border:1px solid var(--line);border-radius:13px;padding:10px 6px 8px;background:#f7f7f2;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:6px;min-width:0;touch-action:none;user-select:none;transition:border-color .15s,background .15s}.piece[aria-pressed=true]{background:#eaf2e5;border:2px solid #63896f;padding:9px 5px 7px}.piece:disabled{border-style:dashed;opacity:.48}.piece.unplaceable:not(:disabled){opacity:.55}.piece-grid{display:grid;grid-template-columns:repeat(var(--cols),16px);grid-auto-rows:16px;gap:3px;pointer-events:none}.piece-square{border-radius:3px}.piece small{font-size:9px;line-height:1.3;color:var(--muted);pointer-events:none}.piece-label{min-height:12px}.game-actions{display:flex;gap:12px;align-items:center;justify-content:space-between;margin-top:16px}.text-button{font-size:11px;border:0;background:transparent;padding:9px 0;text-underline-offset:3px}.text-button:hover{text-decoration:underline}.save-dot{color:var(--muted);font-size:10px}.save-dot:before{content:'';display:inline-block;width:5px;height:5px;border-radius:50%;background:#789475;margin-right:5px}.storage-note{font-size:11px;line-height:1.6;color:#855b2d;padding:10px;background:#fff4df;border-radius:8px}footer{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:20px;font-size:11px;color:var(--muted)}footer span{font-size:9px;letter-spacing:.14em}dialog{border:1px solid var(--line);border-radius:24px;padding:0;width:calc(100% - 32px);max-width:370px;max-height:90dvh;color:var(--ink);background:#fffdfa;box-shadow:0 20px 80px #193f4533}dialog::backdrop{background:#193f4588;backdrop-filter:blur(4px)}.dialog-inner{padding:28px;text-align:center}.dialog-inner .eyebrow{justify-content:center}.dialog-inner h2{font-size:22px;letter-spacing:-.03em;margin:18px 0 10px}.dialog-inner p{font-size:12px;line-height:1.7;color:var(--muted)}.result-score{font-size:56px;letter-spacing:-.05em;display:block;font-variant-numeric:tabular-nums}.primary,.secondary{width:100%;padding:14px 10px;border-radius:11px;font-size:14px;font-weight:700;margin-top:10px}.primary{background:var(--ink);border:1px solid var(--ink);color:white}.secondary{background:transparent;border:1px solid var(--line)}.result-link{display:block;font-size:12px;margin:19px 0 6px}#share-text{width:100%;min-height:115px;font:inherit;font-size:12px;padding:10px;margin-top:12px;resize:vertical}body.dragging{cursor:grabbing}.board{scroll-margin-top:15px}
@keyframes clear-pop{0%{background:#f6dea7;transform:scale(.85)}100%{background:#31555a;transform:scale(1)}}@keyframes place-pop{0%{transform:scale(.85)}100%{transform:scale(1)}}
@media(max-width:850px){.shell{max-width:510px;padding:18px 20px 24px}.top{padding-bottom:15px}.layout{display:flex;flex-direction:column;gap:17px;padding:21px 0}.intro{padding:0;width:100%;display:contents}.eyebrow{font-size:9px}h1{font-size:30px;margin:0;letter-spacing:-.05em}h1 span{display:inline;font-size:13px;letter-spacing:.02em;margin-left:12px}.lead{display:none}.intro>.eyebrow{display:none}.mode-switch{width:100%;order:1;border-radius:13px}.mode-switch button{padding:9px 4px}.mode-switch small{font-size:9px;margin-top:2px}.mode-note{order:2;margin:-8px 3px -6px;min-height:0;font-size:11px}.game{order:3;width:100%;padding:16px;border-radius:22px}.rules{order:4;width:100%;margin:0}.board-link{order:5;width:100%}.private-note{order:6;margin:0}.score-row strong{font-size:33px}.best strong{font-size:22px}.feedback{margin:10px 0 4px;font-size:11px;min-height:36px}.tray{min-height:91px}.game-actions{margin-top:10px}.board{padding:8px;gap:4px}.piece-grid{grid-template-columns:repeat(var(--cols),15px);grid-auto-rows:15px;gap:3px}footer{flex-direction:column;font-size:10px;padding-top:16px}.pilot{font-size:9px}.back{font-size:11px}}
@media(max-width:360px){.shell{padding:14px 12px}.game{padding:12px}.board{gap:3px;padding:7px}h1{font-size:27px}h1 span{font-size:11px;margin-left:7px}.tray{gap:6px}.piece-grid{grid-template-columns:repeat(var(--cols),13px);grid-auto-rows:13px}.pilot{font-size:8px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}dialog::backdrop{backdrop-filter:none}}