:root{--bg:#f5f9ec;--surface:#fff;--border:#dbe8c4;--text:#1a2711;--text-muted:#5a6b4a;--accent:#65a30d;--accent-contrast:#fff;--error-bg:#fdeceb;--error-border:#e5534b;--error-text:#8a1f16;--font-display:"Fraunces", Georgia, serif;--font-mono:"JetBrains Mono", ui-monospace, Consolas, monospace;--font-sans:"Inter", system-ui, "Segoe UI", sans-serif;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=dark]{--bg:#0d1408;--surface:#16220e;--border:#2b3d1c;--text:#eaf3de;--text-muted:#9db387;--accent:#a3e635;--accent-contrast:#10200a;--error-bg:#3a1c1c;--error-border:#e5534b;--error-text:#ffb4ac;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);font-family:var(--font-sans);margin:0}#root{min-height:100svh}.page{justify-content:center;min-height:100%;padding:3rem 1.25rem;display:flex}.shell{flex-direction:column;gap:.75rem;width:100%;max-width:560px;display:flex}.site-header{align-items:center;gap:10px;padding:0 .25rem;display:flex}.site-header__brand{font-family:var(--font-mono);letter-spacing:.04em;color:var(--accent);white-space:nowrap;font-size:.8rem;font-weight:700;text-decoration:none}.site-header__brand:hover{text-decoration:underline}.site-header__divider{color:var(--text-muted);font-weight:400}.site-header__title{font-family:var(--font-mono);color:var(--text-muted);white-space:nowrap;font-size:.8rem;font-weight:500}.toolbar-spacer{flex:1}.toggle-btn{border:1px solid var(--border);color:var(--text);cursor:pointer;background:0 0;border-radius:8px;padding:.35rem .55rem;line-height:1}.toggle-btn:hover{border-color:var(--accent)}.card{background:var(--surface);border:1px solid var(--border);border-radius:20px;width:100%;padding:2.5rem 2.25rem;box-shadow:0 30px 60px -35px #00000059}.eyebrow{font-family:var(--font-mono);letter-spacing:.28em;text-transform:uppercase;color:var(--accent);margin:0 0 .75rem;font-size:.75rem}h1{font-family:var(--font-display);color:var(--text);margin:0 0 .75rem;font-size:clamp(1.4rem,4vw,1.9rem);font-weight:600;line-height:1.25}.subhead{color:var(--text-muted);margin:0 0 1.5rem;font-size:.9rem;line-height:1.5}.controls{gap:.6rem;margin-bottom:1.25rem;display:flex}.difficulty-toggle{border:1px solid var(--border);border-radius:10px;flex:1;display:inline-flex;overflow:hidden}.difficulty-toggle button{background:var(--bg);color:var(--text-muted);font-family:var(--font-sans);cursor:pointer;border:none;flex:1;padding:.55rem .6rem;font-size:.85rem}.difficulty-toggle button.active{background:var(--accent);color:var(--accent-contrast);font-weight:600}.btn{background:var(--bg);color:var(--text);border:1px solid var(--border);font-family:var(--font-sans);cursor:pointer;border-radius:10px;padding:.55rem 1rem;font-size:.85rem;font-weight:600}.btn:hover{filter:brightness(1.05)}.stats{gap:.6rem;margin-bottom:1rem;display:flex}.stat{background:var(--bg);border:1px solid var(--border);border-radius:10px;flex-direction:column;flex:1;align-items:center;gap:.2rem;padding:.6rem;display:flex}.stat-value{font-family:var(--font-mono);color:var(--text);font-size:1.3rem;font-weight:700}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;font-size:.72rem}.win-banner{color:var(--text);text-align:center;background:#65a30d26;border-radius:10px;margin:0 0 1rem;padding:.65rem .8rem;font-size:.9rem;font-weight:600}.grid{gap:.5rem;display:grid}.tile{aspect-ratio:1;cursor:pointer;perspective:600px;background:0 0;border:none;padding:0}.tile:disabled{cursor:default}.tile-inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .35s;display:block;position:relative}.tile--flipped .tile-inner,.tile--matched .tile-inner{transform:rotateY(180deg)}.tile-face{backface-visibility:hidden;border-radius:10px;justify-content:center;align-items:center;font-size:1.4rem;display:flex;position:absolute;inset:0}.tile-face--back{background:var(--accent);color:var(--accent-contrast);font-family:var(--font-display);font-weight:700}.tile-face--front{background:var(--bg);border:1px solid var(--border);transform:rotateY(180deg)}.tile--matched .tile-face--front{border-color:var(--accent);opacity:.6}@media (width<=480px){.card{padding:2rem 1.4rem}.tile-face{font-size:1.1rem}}