:root{--color-primary:#7c3aed;--color-primary-light:#ede9fe;--color-surface:#fff;--color-background:#f5f3fb;--color-border:#e4e0ee;--color-text:#1c1830;--color-text-secondary:#5d5775;--color-text-tertiary:#968fae;--radius:8px;--radius-lg:12px;--shadow-sm:0 1px 3px #00000014;--shadow-md:0 6px 20px #3c1e782e;--max-width:720px;--cell-1:#3b82f6;--cell-2:#10b981;--cell-3:#f59e0b;--cell-4:#ec4899;--cell-5:#8b5cf6;--cell-6:#ef4444}@media (prefers-color-scheme:dark){:root{--color-primary:#a78bfa;--color-primary-light:#2a2342;--color-surface:#1b1730;--color-background:#110e1f;--color-border:#322b4a;--color-text:#e9e5f5;--color-text-secondary:#a89fc4;--color-text-tertiary:#6f6790;--shadow-sm:0 1px 3px #0006;--shadow-md:0 6px 20px #00000080}}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--color-background);color:var(--color-text);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Hiragino Sans,Noto Sans JP,sans-serif;line-height:1.6}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:var(--max-width);margin:0 auto;padding:0 16px}.site-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);z-index:10;padding:12px 0;position:sticky;top:0}.site-header .container{align-items:center;gap:20px;display:flex}.site-header__title{white-space:nowrap;font-size:1.05rem;font-weight:800}.site-header__title a{color:var(--color-text)}.site-nav{gap:4px;margin-left:auto;display:flex}.site-nav a{color:var(--color-text-secondary);border-radius:var(--radius);white-space:nowrap;padding:6px 12px;font-size:.875rem;font-weight:500}.site-nav a:hover,.site-nav a.active{background:var(--color-primary-light);color:var(--color-primary);text-decoration:none}.lang-switch{color:var(--color-primary);background:var(--color-primary-light);border-radius:var(--radius);white-space:nowrap;padding:4px 10px;font-size:.75rem;font-weight:700}.lang-switch:hover{background:var(--color-primary);color:#fff;text-decoration:none}.main{min-height:calc(100vh - 200px);padding:24px 0}.site-footer{background:var(--color-surface);border-top:1px solid var(--color-border);text-align:center;color:var(--color-text-secondary);margin-top:48px;padding:24px 0;font-size:.85rem}.loading{min-height:200px;color:var(--color-text-tertiary);justify-content:center;align-items:center;display:flex}.page-title{margin-bottom:4px;font-size:1.5rem;font-weight:800}.page-description{color:var(--color-text-secondary);margin-bottom:20px}.game{flex-direction:column;align-items:center;gap:14px;display:flex}.hud{justify-content:space-between;align-items:center;gap:10px;width:100%;max-width:360px;display:flex}.hud__item{flex-direction:column;align-items:center;gap:2px;display:flex}.hud__label{text-transform:uppercase;letter-spacing:.04em;color:var(--color-text-tertiary);font-size:.7rem}.hud__value{font-variant-numeric:tabular-nums;font-size:1.1rem;font-weight:800}.hud__next{flex-direction:row;align-items:center;gap:6px}.hud__next-pair{flex-direction:column;gap:2px;display:flex}.hud__next-cell{width:28px;height:28px;font-size:.95rem}.board-wrap{width:100%;max-width:360px;position:relative}.board{background:var(--color-border);border:3px solid var(--color-border);border-radius:var(--radius);touch-action:manipulation;grid-template-columns:repeat(7,1fr);gap:3px;padding:3px;display:grid;position:relative}.piece-fall{z-index:2;pointer-events:none;transform:translateY(calc(var(--vy,0) * var(--pitch,0) + 3px));position:absolute;top:0;left:3px}.piece-cell{color:#fff;transform:translate(calc(var(--cx,0) * var(--pitch,0)), calc(var(--roff,0) * var(--pitch,0)));border-radius:5px;justify-content:center;align-items:center;font-size:1.1rem;font-weight:800;transition:transform 90ms ease-out;display:flex;position:absolute;top:0;left:0;box-shadow:inset 0 0 0 3px #ffffffd9}.cell{aspect-ratio:1;color:#fff;font-variant-numeric:tabular-nums;-webkit-user-select:none;user-select:none;border-radius:5px;justify-content:center;align-items:center;font-size:1.1rem;font-weight:800;transition:background-color .12s;display:flex}.cell--empty{background:var(--color-surface)}.cell--1{background:var(--cell-1)}.cell--2{background:var(--cell-2)}.cell--3{background:var(--cell-3)}.cell--4{background:var(--cell-4)}.cell--5{background:var(--cell-5)}.cell--6{background:var(--cell-6)}.cell--active{box-shadow:inset 0 0 0 3px #ffffffd9}.cell--clearing{z-index:1;animation:.23s forwards cell-pop}@keyframes cell-pop{0%{filter:brightness();transform:scale(1)}35%{filter:brightness(1.6);transform:scale(1.22);box-shadow:0 0 14px #ffffffe6}to{filter:brightness(2);opacity:0;transform:scale(.1)}}.chain-badge{color:#7c2d12;box-shadow:var(--shadow-md);pointer-events:none;z-index:2;background:#fde047;border-radius:999px;padding:6px 18px;font-size:1.3rem;font-weight:800;animation:.5s chain-pop;position:absolute;top:38%;left:50%;transform:translate(-50%,-50%)}@keyframes chain-pop{0%{opacity:0;transform:translate(-50%,-30%)scale(.5)}30%{opacity:1;transform:translate(-50%,-50%)scale(1.15)}to{opacity:.9;transform:translate(-50%,-60%)scale(1)}}.overlay{border-radius:var(--radius);color:#fff;text-align:center;background:#140e28c7;flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:16px;animation:.25s overlay-in;display:flex;position:absolute;inset:0}@keyframes overlay-in{0%{opacity:0}to{opacity:1}}.overlay__title{animation:.3s pop-in}@keyframes pop-in{0%{opacity:0;transform:scale(.7)}to{opacity:1;transform:scale(1)}}@media (prefers-reduced-motion:reduce){.cell--clearing,.chain-badge,.overlay,.overlay__title{animation:none}.piece-cell{transition:none}}.overlay__title{font-size:1.6rem;font-weight:800}.overlay__high{color:#fde047;font-size:1rem;font-weight:700}.overlay__score{font-size:1.1rem}.btn{border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);border-radius:var(--radius);cursor:pointer;padding:10px 20px;font-size:.95rem;font-weight:700;transition:all .15s}.btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.btn--primary{background:var(--color-primary);color:#fff;border-color:var(--color-primary);padding:12px 28px;font-size:1.05rem}.btn--primary:hover{opacity:.92;color:#fff}.actions{gap:10px;display:flex}.controls{grid-template-columns:repeat(5,1fr);gap:8px;width:100%;max-width:360px;display:grid}.ctrl-btn{background:var(--color-surface);color:var(--color-text);border:1px solid var(--color-border);border-radius:var(--radius);cursor:pointer;touch-action:manipulation;padding:14px 0;font-size:1.3rem;line-height:1;transition:background .1s}.ctrl-btn:hover:not(:disabled){background:var(--color-primary-light)}.ctrl-btn:active:not(:disabled){background:var(--color-primary);color:#fff}.ctrl-btn:disabled{opacity:.4;cursor:not-allowed}.ctrl-btn--drop{color:var(--color-primary);font-weight:800}.ctrl-btn--rotate{color:var(--color-primary)}.key-hint{color:var(--color-text-tertiary);text-align:center;font-size:.8rem}.seo-content{color:var(--color-text-secondary);margin-top:40px;font-size:.9375rem;line-height:1.8}.seo-content h2{color:var(--color-text);margin-top:24px;margin-bottom:8px;font-size:1.12rem}.seo-content p{margin-bottom:8px}.seo-content ol,.seo-content ul{margin-bottom:8px;padding-left:22px}.seo-content li{margin-bottom:6px}@media (width<=640px){.site-header .container{flex-wrap:wrap;gap:10px}.site-nav{margin-left:0}.lang-switch{margin-left:auto}.page-title{font-size:1.3rem}}