:root{--bg-0: #0b0e1f;--bg-1: #141934;--surface: rgba(255, 255, 255, .06);--surface-strong: rgba(255, 255, 255, .1);--border: rgba(255, 255, 255, .12);--text: #eef1ff;--text-dim: #aab0d6;--p1: #ff5d73;--p1-glow: rgba(255, 93, 115, .55);--p2: #ffd23f;--p2-glow: rgba(255, 210, 63, .55);--accent: #5b8cff;--accent-2: #7a5bff;--win: #43e0a0;--radius: 18px;--radius-sm: 12px;--shadow: 0 18px 50px rgba(0, 0, 0, .45);--focus: #8ee3ff;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html,body{margin:0;padding:0;min-height:100%}body{font-family:Segoe UI,system-ui,-apple-system,Helvetica Neue,Arial,sans-serif;color:var(--text);background:radial-gradient(1200px 800px at 15% -10%,rgba(122,91,255,.25),transparent 60%),radial-gradient(1000px 700px at 110% 10%,rgba(91,140,255,.22),transparent 55%),linear-gradient(160deg,var(--bg-0),var(--bg-1));background-attachment:fixed;-webkit-font-smoothing:antialiased}#root{min-height:100vh;min-height:100dvh}button{font-family:inherit;cursor:pointer}:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:6px}.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.app{display:flex;flex-direction:column;align-items:center;gap:22px;padding:clamp(16px,4vw,40px) 16px 48px;max-width:760px;margin:0 auto}.app__header{text-align:center;margin-top:4px}.app__title{margin:0;font-size:clamp(1.9rem,6vw,3rem);font-weight:800;letter-spacing:.5px;background:linear-gradient(90deg,var(--p1),var(--p2) 45%,var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}.app__subtitle{margin:6px 0 0;color:var(--text-dim);font-size:clamp(.85rem,2.5vw,1rem)}.card{width:100%;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--border);background:var(--surface-strong);color:var(--text);font-size:1rem;font-weight:600;padding:12px 18px;min-height:44px;min-width:44px;border-radius:var(--radius-sm);transition:transform .12s ease,background .2s ease,box-shadow .2s ease,border-color .2s ease}.btn:hover{background:#ffffff29;border-color:#ffffff4d}.btn:active{transform:translateY(1px) scale(.99)}.btn--primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));border-color:transparent;box-shadow:0 10px 24px #5b8cff59}.btn--primary:hover{box-shadow:0 12px 30px #7a5bff73}.btn--ghost{background:transparent}.btn--pressed{border-color:var(--focus);background:#8ee3ff29}.start{display:flex;flex-direction:column;gap:16px;padding:clamp(20px,5vw,34px)}.start__lead{margin:0 0 4px;color:var(--text-dim);text-align:center}.mode-list{display:grid;gap:14px}.mode-btn{display:flex;align-items:center;gap:16px;text-align:left;padding:18px 20px}.mode-btn__icon{font-size:1.8rem;line-height:1;flex:0 0 auto}.mode-btn__body{display:flex;flex-direction:column;gap:2px}.mode-btn__title{font-size:1.1rem;font-weight:700}.mode-btn__desc{font-size:.85rem;color:var(--text-dim);font-weight:500}.statusbar{display:flex;align-items:center;justify-content:center;gap:12px;width:100%;padding:14px 16px;font-weight:700;font-size:clamp(1rem,3.5vw,1.25rem);text-align:center}.turn-dot{width:18px;height:18px;border-radius:50%;flex:0 0 auto;border:2px solid rgba(255,255,255,.5)}.turn-dot--P1{background:var(--p1);box-shadow:0 0 14px var(--p1-glow)}.turn-dot--P2{background:var(--p2);box-shadow:0 0 14px var(--p2-glow)}.status-error{color:#ffd9df;background:#ff5d732e;border-color:#ff5d7366;border-radius:var(--radius-sm)}.notice{width:100%;text-align:center;font-size:.85rem;color:#ffe9a8;background:#ffd23f1f;border:1px solid rgba(255,210,63,.3);border-radius:var(--radius-sm);padding:8px 12px}.board-wrap{width:100%;display:flex;justify-content:center}.board{--cols: 7;--rows: 6;width:min(100%,560px);aspect-ratio:var(--cols) / var(--rows);display:grid;grid-template-columns:repeat(var(--cols),1fr);gap:clamp(4px,1.4vw,10px);padding:clamp(8px,2.2vw,16px);border-radius:var(--radius);background:linear-gradient(160deg,#2a306a,#1b2050);border:1px solid rgba(255,255,255,.14);box-shadow:var(--shadow),inset 0 0 40px #00000059}.column{display:grid;grid-template-rows:repeat(var(--rows),1fr);gap:clamp(4px,1.4vw,10px);padding:0;border:none;background:transparent;border-radius:10px;transition:background .15s ease}.column:not(:disabled):hover,.column:not(:disabled):focus-visible{background:#8ee3ff1f}.column:disabled{cursor:default}.cell{position:relative;width:100%;aspect-ratio:1 / 1;border-radius:50%;background:radial-gradient(circle at 32% 28%,#11142e,#0a0c20 70%);box-shadow:inset 0 3px 8px #0009;overflow:hidden}.piece{position:absolute;top:6%;right:6%;bottom:6%;left:6%;border-radius:50%}.piece--P1{background:radial-gradient(circle at 34% 30%,#ff97a6,var(--p1) 60%,#c8324a);box-shadow:0 0 14px var(--p1-glow)}.piece--P2{background:radial-gradient(circle at 34% 30%,#ffe88a,var(--p2) 60%,#c79a18);box-shadow:0 0 14px var(--p2-glow)}.piece__mark{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:clamp(.7rem,2.6vw,1.2rem);color:#0000009e}.piece--drop{animation:drop-in .42s cubic-bezier(.34,1.2,.5,1)}@keyframes drop-in{0%{transform:translateY(-620%);opacity:.6}70%{transform:translateY(0)}82%{transform:translateY(-8%)}to{transform:translateY(0)}}.cell--winning .piece{animation:win-pulse .9s ease-in-out infinite alternate}.cell--winning{outline:3px solid var(--win);outline-offset:-2px;border-radius:50%}@keyframes win-pulse{0%{transform:scale(1);box-shadow:0 0 10px var(--win)}to{transform:scale(1.08);box-shadow:0 0 26px var(--win)}}.controls{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;width:100%}.controls .btn{flex:1 1 auto;min-width:120px}.scoreboard{width:100%;padding:16px}.scoreboard__title{margin:0 0 12px;font-size:.95rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--text-dim);text-align:center}.scoreboard__grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.stat{display:flex;flex-direction:column;align-items:center;gap:4px;padding:10px 6px;border-radius:var(--radius-sm);background:var(--surface-strong);border:1px solid var(--border)}.stat__value{font-size:clamp(1.1rem,4vw,1.6rem);font-weight:800}.stat__label{font-size:.68rem;color:var(--text-dim);text-align:center;text-transform:uppercase;letter-spacing:.5px}.stat--p1 .stat__value{color:var(--p1)}.stat--p2 .stat__value{color:var(--p2)}.stat--cpu .stat__value{color:var(--accent)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;padding:20px;background:#060814a8;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:50;animation:fade-in .2s ease}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.modal{width:min(100%,420px);padding:28px 26px;text-align:center;background:linear-gradient(160deg,#1b2150,#141a3a);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);animation:pop-in .28s cubic-bezier(.34,1.3,.5,1)}@keyframes pop-in{0%{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}.modal__badge{font-size:3rem;line-height:1}.modal__title{margin:12px 0 6px;font-size:1.8rem;font-weight:800}.modal__subtitle{margin:0 0 22px;color:var(--text-dim)}.modal__actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}.sound-toggle{display:inline-flex;align-items:center;gap:8px}@media (prefers-reduced-motion: reduce){*{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}}@media (max-width: 480px){.controls .btn{flex-basis:calc(50% - 10px)}.scoreboard__grid{gap:6px}.stat__label{font-size:.6rem}}.app--wide{max-width:920px}.app__back{display:inline-block;margin-bottom:10px;color:var(--text-dim);text-decoration:none;font-weight:600;font-size:.95rem;padding:6px 10px;border-radius:999px;background:var(--surface);border:1px solid var(--border);transition:color .18s ease,background .18s ease,transform .18s ease}.app__back:hover{color:var(--text);background:var(--surface-strong);transform:translate(-2px)}.home{max-width:1080px;margin:0 auto;padding:clamp(20px,5vw,56px) 18px 64px}.hero{text-align:center;padding:clamp(28px,6vw,64px) clamp(16px,4vw,40px);border-radius:var(--radius);background:radial-gradient(800px 400px at 50% -20%,rgba(122,91,255,.35),transparent 70%),var(--surface);border:1px solid var(--border);box-shadow:var(--shadow)}.hero__eyebrow{text-transform:uppercase;letter-spacing:.28em;font-size:.8rem;color:var(--accent);margin:0 0 10px;font-weight:700}.hero__title{font-size:clamp(2.2rem,6vw,4rem);line-height:1.05;margin:0 0 16px;font-weight:800;letter-spacing:-.02em}.hero__title-accent{background:linear-gradient(120deg,var(--accent),var(--accent-2),var(--p1));-webkit-background-clip:text;background-clip:text;color:transparent}.hero__subtitle{max-width:56ch;margin:0 auto 26px;color:var(--text-dim);font-size:clamp(1rem,2.2vw,1.2rem);line-height:1.6}.hero__cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.section-title{font-size:1.5rem;margin:48px 0 18px;text-align:center}.game-grid{list-style:none;margin:0;padding:0;display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.game-card{border-radius:var(--radius);overflow:hidden;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);transition:transform .2s ease,border-color .2s ease}.game-card:hover,.game-card:focus-within{transform:translateY(-6px);border-color:var(--accent)}.game-card__link{display:flex;flex-direction:column;height:100%;text-decoration:none;color:inherit}.game-card__art{height:120px;display:grid;place-items:center}.game-card__icon{font-size:3.2rem;filter:drop-shadow(0 4px 12px rgba(0,0,0,.35))}.game-card__body{padding:18px 18px 8px;flex:1}.game-card__title{margin:0 0 2px;font-size:1.3rem}.game-card__tagline{margin:0 0 10px;color:var(--accent);font-weight:600;font-size:.92rem}.game-card__desc{margin:0 0 12px;color:var(--text-dim);line-height:1.5;font-size:.95rem}.game-card__players{display:inline-block;font-size:.78rem;color:var(--text-dim);background:var(--surface-strong);border:1px solid var(--border);padding:4px 10px;border-radius:999px}.game-card__play{display:block;padding:14px 18px 18px;font-weight:700;color:var(--text)}.btn--lg{padding:14px 24px;font-size:1.05rem}.difficulty,.botvbot{border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;margin:0 0 16px;width:100%}.difficulty__legend{padding:0 8px;color:var(--text-dim);font-size:.85rem;font-weight:600}.segmented{display:flex;gap:8px;flex-wrap:wrap}.segmented__btn{flex:1 1 0;min-width:88px;min-height:44px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:8px 10px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);color:var(--text);transition:background .18s ease,border-color .18s ease,transform .12s ease}.segmented__btn:hover{background:var(--surface-strong)}.segmented__btn.is-active{border-color:var(--accent);background:#5b8cff2e}.segmented__label{font-weight:700}.segmented__hint{font-size:.72rem;color:var(--text-dim)}.botvbot__row{display:flex;gap:14px;flex-wrap:wrap}.botvbot__pick{flex:1 1 140px;display:flex;flex-direction:column;gap:6px;font-size:.9rem;color:var(--text-dim)}.botvbot__pick select{min-height:44px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-1);color:var(--text);padding:0 10px;font-size:1rem}.botvbot__hint{margin:10px 0 0;font-size:.8rem;color:var(--text-dim)}.ttt-board{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:min(92vw,360px);aspect-ratio:1 / 1}.ttt-cell{display:grid;place-items:center;font-size:clamp(2.4rem,12vw,3.6rem);font-weight:800;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);color:var(--text);transition:background .16s ease,transform .12s ease}.ttt-cell:hover:not(:disabled){background:var(--surface-strong);transform:translateY(-2px)}.ttt-cell--X{color:var(--p1);text-shadow:0 0 18px var(--p1-glow)}.ttt-cell--O{color:var(--p2);text-shadow:0 0 18px var(--p2-glow)}.ttt-cell--win{background:#43e0a033;border-color:var(--win)}.gomoku-board{display:grid;gap:2px;width:min(94vw,640px);aspect-ratio:1 / 1;background:#785a3259;padding:6px;border-radius:var(--radius-sm);border:1px solid var(--border)}.gomoku-cell{position:relative;border:none;background:linear-gradient(145deg,#d9b382,#c89b66);display:grid;place-items:center;padding:0;border-radius:2px}.gomoku-cell:hover:not(:disabled) .gomoku-stone{background:#0000002e;transform:scale(.7)}.gomoku-stone{width:78%;height:78%;border-radius:50%;background:transparent;transition:transform .12s ease,background .12s ease}.gomoku-cell--B .gomoku-stone{background:radial-gradient(circle at 35% 30%,#5a5a5a,#0c0c0c);transform:scale(1)}.gomoku-cell--W .gomoku-stone{background:radial-gradient(circle at 35% 30%,#fff,#c4c4c4);transform:scale(1)}.gomoku-cell--last{box-shadow:inset 0 0 0 2px var(--accent)}.gomoku-cell--win{box-shadow:inset 0 0 0 2px var(--win)}.memory-board{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;width:min(92vw,440px)}.memory-card{aspect-ratio:1 / 1;border:none;background:transparent;perspective:700px;padding:0}.memory-card__inner{position:relative;width:100%;height:100%;transition:transform .4s ease;transform-style:preserve-3d}.memory-card.is-flipped .memory-card__inner{transform:rotateY(180deg)}.memory-card__face{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;border-radius:var(--radius-sm);border:1px solid var(--border);backface-visibility:hidden;font-size:clamp(1.8rem,9vw,2.6rem)}.memory-card__face--back{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font-weight:800}.memory-card__face--front{background:var(--surface-strong);transform:rotateY(180deg)}.memory-card.is-matched .memory-card__face--front{border-color:var(--win);box-shadow:0 0 18px #43e0a066}.memory-best{margin-left:auto;color:var(--text-dim);font-size:.9rem}@media (max-width: 520px){.game-grid{grid-template-columns:1fr}}