:root{--bg:#0f1023;--bg-soft:#171a33;--panel:hsla(0,0%,100%,.05);--panel-border:hsla(0,0%,100%,.09);--text:#eef0ff;--muted:#9aa0c3;--x:#5eead4;--o:#f9a8d4;--win:#fde68a;--danger:#fb7185}*{box-sizing:border-box;margin:0;padding:0}body,html{height:100%}body{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:radial-gradient(1100px 600px at 15% -10%,#2b2f63 0,transparent 55%),radial-gradient(900px 500px at 110% 110%,#3d1f4f 0,transparent 55%),var(--bg);color:var(--text);min-height:100dvh;align-items:center;justify-content:center;padding:24px 16px;-webkit-font-smoothing:antialiased}.page,body{display:flex}.page{width:100%;max-width:460px;flex-direction:column;gap:18px}.header{text-align:center}.header h1{font-size:clamp(1.8rem,6vw,2.4rem);font-weight:800;letter-spacing:-.02em}.header h1 .x{color:var(--x)}.header h1 .o{color:var(--o)}.header p{color:var(--muted);font-size:.9rem;margin-top:4px}.card{background:var(--panel);border:1px solid var(--panel-border);border-radius:20px;padding:18px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);box-shadow:0 20px 50px rgba(0,0,0,.35)}.modes{display:grid;grid-template-columns:1fr 1fr;grid-gap:8px;gap:8px}.mode-btn{padding:10px 8px;border-radius:12px;border:1px solid var(--panel-border);background:transparent;color:var(--muted);font-weight:600;font-size:.9rem;cursor:pointer;transition:all .15s ease}.mode-btn:hover{color:var(--text);border-color:hsla(0,0%,100%,.25)}.mode-btn.active{background:linear-gradient(135deg,rgba(94,234,212,.18),rgba(249,168,212,.18));color:var(--text);border-color:rgba(94,234,212,.45)}.difficulty{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:8px;gap:8px;margin-top:10px}.diff-btn{padding:8px 4px;border-radius:10px;border:1px solid var(--panel-border);background:transparent;color:var(--muted);font-weight:600;font-size:.82rem;cursor:pointer;transition:all .15s ease}.diff-btn:hover{color:var(--text)}.diff-btn.active{background:rgba(94,234,212,.12);color:var(--x);border-color:rgba(94,234,212,.4)}.scoreboard{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;grid-gap:8px;gap:8px;text-align:center}.score{display:flex;flex-direction:column;gap:2px;padding:10px 8px;border-radius:14px;background:hsla(0,0%,100%,.03);border:1px solid transparent;transition:all .2s ease}.score.active{border-color:hsla(0,0%,100%,.18);background:hsla(0,0%,100%,.07)}.score .label{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.score .value{font-size:1.5rem;font-weight:800}.score.x .value{color:var(--x)}.score.o .value{color:var(--o)}.score .draws{color:var(--muted);font-size:.8rem;font-weight:600}.status{text-align:center;font-weight:600;min-height:24px;margin-top:12px}.status .turn-x{color:var(--x)}.status .turn-o{color:var(--o)}.status .winner{color:var(--win)}.board{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:10px;gap:10px;margin-top:14px}.cell{aspect-ratio:1;border-radius:14px;border:1px solid var(--panel-border);background:hsla(0,0%,100%,.04);font-size:clamp(2rem,9vw,2.8rem);font-weight:800;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s ease,transform .1s ease,border-color .15s ease;color:var(--text)}.cell:hover:enabled{background:hsla(0,0%,100%,.09);transform:translateY(-2px)}.cell:active:enabled{transform:scale(.97)}.cell:disabled{cursor:default}.cell.x{color:var(--x)}.cell.o{color:var(--o)}.cell.win{background:hsla(48,97%,77%,.14);border-color:hsla(48,97%,77%,.55);animation:pop .3s ease}.cell.pop{animation:pop .25s ease}@keyframes pop{0%{transform:scale(.6);opacity:0}60%{transform:scale(1.08)}to{transform:scale(1);opacity:1}}.actions{display:flex;gap:10px;margin-top:16px}.btn{flex:1 1;padding:12px;border-radius:12px;border:1px solid var(--panel-border);background:hsla(0,0%,100%,.06);color:var(--text);font-weight:700;font-size:.92rem;cursor:pointer;transition:all .15s ease}.btn:hover:enabled{background:hsla(0,0%,100%,.12)}.btn:disabled{opacity:.4;cursor:default}.btn.primary{background:linear-gradient(135deg,#5eead4,#818cf8);border-color:transparent;color:#10122b}.btn.primary:hover:enabled{filter:brightness(1.08)}.hint{text-align:center;color:var(--muted);font-size:.78rem}@media (max-width:380px){.card{padding:14px}}