:root{--bg:#f4f6fb;--surface:#ffffff;--surface-2:#eef1f7;--text:#1c2230;--text-dim:#5b6577;--border:#d8deea;--accent:#2563eb;--accent-contrast:#ffffff;--danger:#dc2626;--flag:#dc2626;--cell-cover:#c3cde0;--cell-cover-2:#b3bfd6;--cell-cover-hover:#d2dbec;--cell-open:#e9edf6;--cell-open-line:#d8deea;--cell-radius:4px;--n1:#2563eb;--n2:#15803d;--n3:#dc2626;--n4:#6d28d9;--n5:#b45309;--n6:#0e7490;--n7:#1c2230;--n8:#64748b;--maxw:960px;--shadow:0 1px 3px rgba(20,30,60,0.08),0 6px 24px rgba(20,30,60,0.06)}[data-theme=dark]{--bg:#0f1420;--surface:#182032;--surface-2:#1f2940;--text:#e6ebf5;--text-dim:#9aa6bd;--border:#2b3650;--accent:#4f8cff;--accent-contrast:#0b1020;--danger:#f87171;--flag:#f87171;--cell-cover:#2b3650;--cell-cover-2:#232d44;--cell-cover-hover:#34415f;--cell-open:#141b2b;--cell-open-line:#222c42;--n1:#6ea8fe;--n2:#4ade80;--n3:#f87171;--n4:#c084fc;--n5:#fbbf24;--n6:#22d3ee;--n7:#e6ebf5;--n8:#94a3b8;--shadow:0 1px 3px rgba(0,0,0,0.4),0 8px 30px rgba(0,0,0,0.35)}[data-theme=classic]{--bg:#008080;--surface:#c0c0c0;--surface-2:#c0c0c0;--text:#000000;--text-dim:#2a2a2a;--border:#808080;--accent:#000080;--accent-contrast:#ffffff;--danger:#d00000;--flag:#d00000;--cell-cover:#c0c0c0;--cell-cover-2:#c0c0c0;--cell-cover-hover:#cacaca;--cell-open:#c0c0c0;--cell-open-line:#808080;--cell-radius:0px;--n1:#0000ff;--n2:#008000;--n3:#ff0000;--n4:#000080;--n5:#800000;--n6:#008080;--n7:#000000;--n8:#808080;--shadow:none}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}[data-theme=classic] body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.25;color:var(--text)}h1{font-size:clamp(1.6rem,4vw,2.4rem);margin:0 0 .5rem}h2{font-size:clamp(1.25rem,3vw,1.6rem);margin:2rem 0 .6rem}.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 1rem}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--surface) 88%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}.nav-inner{display:flex;align-items:center;gap:.75rem;padding:.6rem 1rem;max-width:var(--maxw);margin:0 auto}.brand{font-weight:800;font-size:1.05rem;color:var(--text);white-space:nowrap}.brand span{color:var(--accent)}.nav-links{display:flex;gap:.25rem;overflow-x:auto;flex:1 1;scrollbar-width:none}.nav-links::-webkit-scrollbar{display:none}.nav-links a{padding:.35rem .6rem;border-radius:6px;color:var(--text-dim);font-size:.9rem;white-space:nowrap;font-weight:600}.nav-links a:hover{background:var(--surface-2);text-decoration:none;color:var(--text)}.nav-links a.active{color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent)}.btn{font:inherit;font-weight:600;border:1px solid var(--border);background:var(--surface);color:var(--text);padding:.5rem .85rem;border-radius:8px;cursor:pointer;display:inline-flex;align-items:center;gap:.4rem;-moz-user-select:none;user-select:none;-webkit-user-select:none;touch-action:manipulation}.btn:hover{background:var(--surface-2)}.btn:active{transform:translateY(1px)}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-contrast)}.btn.toggle-on{background:color-mix(in srgb,var(--accent) 14%,transparent);border-color:var(--accent);color:var(--accent)}[data-theme=classic] .btn{border-radius:0;border:2px outset #ffffff;box-shadow:inset -1px -1px #808080,inset 1px 1px #dfdfdf}select.btn{-webkit-appearance:auto;-moz-appearance:auto;appearance:auto}main{padding:1.25rem 0 3rem}.lede{color:var(--text-dim);font-size:1.05rem;max-width:60ch}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.1rem;box-shadow:var(--shadow)}[data-theme=classic] .card{border-radius:0;border-color:#ffffff #808080 #808080 #ffffff;border-style:solid;border-width:2px;box-shadow:none}.prose li,.prose p{color:var(--text)}.prose{max-width:70ch}.prose ol,.prose ul{padding-left:1.3rem}.grid-cards{display:grid;grid-gap:.9rem;gap:.9rem;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));margin:1rem 0}.grid-cards a.card{display:block;color:var(--text)}.grid-cards a.card:hover{border-color:var(--accent);text-decoration:none}.grid-cards .card h3{margin:0 0 .25rem}.grid-cards .card p{margin:0;color:var(--text-dim);font-size:.92rem}.game-shell{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:.85rem;box-shadow:var(--shadow)}[data-theme=classic] .game-shell{border-radius:0;border-color:#ffffff #808080 #808080 #ffffff;border-style:solid;border-width:3px;box-shadow:none}.hud{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin-bottom:.75rem}.hud .readout{font-feature-settings:"tnum";font-variant-numeric:tabular-nums;font-weight:700;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.35rem .6rem;min-width:4.2rem;text-align:center;display:inline-flex;align-items:center;gap:.35rem}[data-theme=classic] .hud .readout{background:#000;color:#ff2d2d;font-family:Courier New,monospace;border-radius:0;border:2px inset #fff}.hud .spacer{flex:1 1}.controls{display:flex;flex-wrap:wrap;gap:.45rem;align-items:center;margin-bottom:.75rem}.controls label{font-size:.85rem;color:var(--text-dim);font-weight:600}.status-msg{font-weight:700;padding:.25rem 0}.status-msg.won{color:var(--n2)}.status-msg.lost{color:var(--danger)}.board-wrap{overflow:auto;-webkit-overflow-scrolling:touch;padding-bottom:.25rem}.board{display:grid;grid-gap:2px;gap:2px;width:max-content;margin:0 auto;touch-action:manipulation}.cell{width:var(--cell-size,32px);height:var(--cell-size,32px);border:none;border-radius:var(--cell-radius);background:var(--cell-cover);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:calc(var(--cell-size, 32px) * .52);cursor:pointer;-moz-user-select:none;user-select:none;-webkit-user-select:none;color:var(--text);padding:0;line-height:1}.cell:hover{background:var(--cell-cover-hover)}[data-theme=classic] .cell{border:2px outset #ffffff;box-shadow:inset -1px -1px #808080,inset 1px 1px #ffffff}.cell.open{background:var(--cell-open);cursor:default;box-shadow:inset 0 0 0 1px var(--cell-open-line)}[data-theme=classic] .cell.open{border:1px solid #808080;box-shadow:none}.cell.open:hover{background:var(--cell-open)}.cell.exploded,.cell.mine{background:var(--danger);color:#fff}.cell.flag{color:var(--flag)}.cell.n1{color:var(--n1)}.cell.n2{color:var(--n2)}.cell.n3{color:var(--n3)}.cell.n4{color:var(--n4)}.cell.n5{color:var(--n5)}.cell.n6{color:var(--n6)}.cell.n7{color:var(--n7)}.cell.n8{color:var(--n8)}.viewport{position:relative;width:100%;height:min(64vh,560px);overflow:hidden;border-radius:10px;background:var(--cell-open);border:1px solid var(--border);touch-action:none;cursor:-webkit-grab;cursor:grab}.viewport:active{cursor:-webkit-grabbing;cursor:grabbing}[data-theme=classic] .viewport{border-radius:0;border:2px inset #fff}.viewport canvas{display:block;image-rendering:pixelated}.hint{font-size:.85rem;color:var(--text-dim);margin-top:.5rem}.faq details{border:1px solid var(--border);border-radius:10px;padding:.4rem .9rem;margin-bottom:.6rem;background:var(--surface)}.faq summary{cursor:pointer;font-weight:700;padding:.45rem 0;list-style:none}.faq summary::-webkit-details-marker{display:none}.faq summary:before{content:"+ ";color:var(--accent);font-weight:800}.faq details[open] summary:before{content:"– "}.site-footer{border-top:1px solid var(--border);background:var(--surface);padding:2rem 0;margin-top:2rem;color:var(--text-dim);font-size:.9rem}.footer-links{display:flex;flex-wrap:wrap;gap:.5rem 1.2rem;margin-bottom:1rem}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media (max-width:560px){.cell{--cell-size:30px}}