:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg-color:#0b0f19;--surface-main:#131a2a;--surface-highlight:#1e293b;--surface-border:#334155;--surface-glass:#131a2ab3;--text-main:#f8fafc;--text-dim:#94a3b8;--text-primary:#34d399;--color-primary:#10b981;--color-primary-glow:#10b98166;--color-error:#ef4444;--color-error-bg:#ef44441a;--color-success:#10b981;--color-accent:#8b5cf6;--cell-size:clamp(30px, 9.5vw, 60px);--cell-border:1px solid #33415580;--cell-border-thick:2px solid #34d399;--cell-bg:var(--surface-main);--cell-bg-selected:#10b98133;--cell-bg-related:#1e293b80;--cell-bg-same-number:#34d39940;--cell-text-initial:#fff;--cell-text-user:#34d399;--cell-text-error:#ff4d4d;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;font-weight:400;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);min-width:320px;min-height:100vh;color:var(--text-main);background-image:radial-gradient(ellipse at top, #1e293b 0%, transparent 80%), radial-gradient(ellipse at bottom, var(--color-primary-glow) 0%, transparent 60%);place-items:center;margin:0;display:flex}#root{width:100%;max-width:1280px;margin:0 auto;padding:1rem}@media (width<=600px){#root{padding:.5rem}}button{background-color:var(--surface-highlight);color:var(--text-main);cursor:pointer;outline-offset:2px;border:1px solid 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1rem;font-size:.9rem;display:flex}.copy-btn.copied{background:var(--color-primary);color:#fff;border-color:#0000}.sns-share-row{gap:.75rem;display:flex}.sns-link{background:var(--surface-main);border:1px solid var(--surface-border);color:var(--text-main);border-radius:12px;flex-direction:column;flex:1;align-items:center;gap:.5rem;padding:1rem .5rem;font-size:.8rem;font-weight:600;text-decoration:none;transition:all .2s;display:flex}.sns-link:hover{border-color:#fff3;transform:translateY(-2px)}.sns-link.twitter:hover{background:#000;box-shadow:0 4px 15px #00000080}.sns-link.facebook:hover{background:#1877f2;box-shadow:0 4px 15px #1877f24d}.sns-link.line:hover{background:#06c755;box-shadow:0 4px 15px #06c7554d}.line-icon{letter-spacing:-1px;font-size:1rem}.lang-selector-btn{border:1px solid var(--surface-border);color:var(--text-dim);cursor:pointer;background:#ffffff0d;border-radius:12px;justify-content:center;align-items:center;width:42px;height:42px;padding:0;transition:all .2s;display:flex;overflow:hidden}.lang-selector-btn:hover,.lang-selector-btn.open{border-color:var(--color-primary);box-shadow:0 0 10px var(--color-primary-glow);background:#ffffff1a}.current-flag-img{object-fit:cover;width:100%;height:100%;transition:transform .2s}.lang-selector-btn:hover .current-flag-img{transform:scale(1.1)}.language-dialog{max-width:480px;padding:1.5rem}.language-grid{grid-template-columns:repeat(2,1fr);gap:.75rem;max-height:50vh;margin-top:1rem;padding-right:.5rem;display:grid;overflow-y:auto}@media (width<=480px){.language-grid{grid-template-columns:1fr}}.lang-menu-item{border:1px solid var(--surface-border);color:var(--text-main);cursor:pointer;text-align:left;background:#ffffff08;border-radius:12px;align-items:center;gap:1rem;padding:1rem;transition:all .2s;display:flex}[dir=rtl] .lang-menu-item{text-align:right;flex-direction:row-reverse}.lang-menu-item:hover{background:#ffffff14;border-color:#fff3;transform:translateY(-2px)}.lang-menu-item.active{background:var(--surface-highlight);border-color:var(--color-primary);color:var(--color-primary);font-weight:600}.menu-flag-img{object-fit:cover;border:1px solid #ffffff1a;border-radius:4px;width:32px;height:22px;box-shadow:0 2px 5px #0003}.menu-lang-name{font-size:1rem}.lang-code-tag{background:var(--surface-highlight);color:var(--color-primary);border-radius:4px;padding:2px 4px;font-size:.7rem;font-weight:800;line-height:1}[dir=rtl]{text-align:right}[dir=rtl] .header-actions{flex-direction:row-reverse}[dir=rtl] .chevron{transform:rotate(0)}[dir=rtl] .seed-btn,[dir=rtl] .share-btn{flex-direction:row-reverse}[dir=rtl] .mistakes-counter,[dir=rtl] .timer{text-align:right;direction:ltr}[dir=rtl] .action-btn{flex-direction:row-reverse}[dir=rtl] .numpad{direction:ltr}@media (width>=1024px){.header{padding-left:0}.main-content{flex-direction:row;justify-content:center;align-items:flex-start;gap:5rem;padding-top:1rem}.board-wrapper{max-width:580px}.controls-section{max-width:440px}}