*,:after,:before{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0f1117;--surface:#1a1d27;--surface2:#22263a;--accent:#6c63ff;--accent-light:#a89bff;--text:#e8eaf6;--text-muted:#8b8fa8;--border:#2e3248;--radius:12px;--font:"Segoe UI",system-ui,sans-serif}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:var(--font);min-height:100vh;display:flex;flex-direction:column}a{color:inherit;text-decoration:none}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:100;background:rgba(15,17,23,.85);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.header-inner{max-width:1100px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;gap:40px}.logo{font-size:1.1rem;font-weight:700;color:var(--accent-light);letter-spacing:-.3px;white-space:nowrap}.main-nav{display:flex;gap:4px;flex-wrap:wrap}.nav-link{color:var(--text-muted);font-size:.9rem;padding:6px 14px;border-radius:8px;transition:background .2s,color .2s}.nav-link:hover{background:var(--surface2);color:var(--text)}.nav-link.active{background:var(--surface2);color:var(--accent-light);font-weight:600}.content{max-width:1100px;margin:0 auto;padding:60px 24px;flex:1 1;width:100%}.hero{text-align:center;margin-bottom:64px}.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;line-height:1.2;margin-bottom:16px}.highlight{color:var(--accent-light)}.subtitle{font-size:1.1rem;max-width:560px;margin:0 auto 24px;line-height:1.6}.badge,.subtitle{color:var(--text-muted)}.badge{display:inline-block;background:var(--surface2);border:1px solid var(--border);font-size:.8rem;padding:6px 16px;border-radius:100px}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));grid-gap:20px;gap:20px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;transition:border-color .2s,transform .2s}.card:hover{border-color:var(--accent);transform:translateY(-3px)}.card-icon{font-size:1.8rem;margin-bottom:14px}.card h3{font-size:1rem;font-weight:700;margin-bottom:8px}.card p{font-size:.9rem;line-height:1.6}.card p,.site-footer{color:var(--text-muted)}.site-footer{border-top:1px solid var(--border);text-align:center;padding:20px 24px;font-size:.82rem}.site-footer a{color:var(--accent-light)}.site-footer a:hover{text-decoration:underline}@media (max-width:600px){.header-inner{gap:16px}.content{padding:40px 16px}}.game-container{max-width:860px;margin:0 auto}.game-title{text-align:center;font-size:1.8rem;font-weight:800;margin-bottom:24px}.game-hint{text-align:center;color:var(--text-muted);font-size:.82rem;margin-top:16px}.game-banner{text-align:center;padding:10px 16px;border-radius:var(--radius);font-weight:700;margin-bottom:14px;font-size:1rem}.game-banner.win{background:#16a34a22;color:#4ade80;border:1px solid #16a34a55}.game-banner.lose{background:#dc262622;color:#f87171;border:1px solid #dc262655}.btn-game{background:var(--accent);color:#fff;border:none;padding:10px 28px;border-radius:8px;font-size:.95rem;font-weight:600;cursor:pointer;transition:opacity .2s}.btn-game:hover{opacity:.85}.btn-game.secondary{background:var(--surface2);color:var(--text-muted);border:1px solid var(--border)}.ms-controls{display:flex;justify-content:center;gap:8px;margin-bottom:16px}.btn-diff{background:var(--surface2);border:1px solid var(--border);color:var(--text-muted);padding:6px 16px;border-radius:8px;cursor:pointer;font-size:.875rem;transition:all .15s}.btn-diff.active,.btn-diff:hover{background:var(--accent);color:#fff;border-color:var(--accent)}.ms-panel{justify-content:space-between;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:10px 20px;margin-bottom:14px;font-family:monospace;font-size:1.1rem}.ms-panel,.ms-reset{display:flex;align-items:center}.ms-reset{background:var(--surface2);border:1px solid var(--border);font-size:1.4rem;border-radius:8px;width:42px;height:42px;cursor:pointer;transition:transform .1s;justify-content:center}.ms-reset:hover{transform:scale(1.1)}.ms-scroll{overflow-x:auto}.ms-board{display:grid;grid-gap:2px;gap:2px;width:-moz-fit-content;width:fit-content;margin:0 auto}.ms-cell{width:30px;height:30px;font-size:.8rem;background:var(--surface2);border:1px solid var(--border);border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;transition:filter .1s}.ms-cell:hover:not(.open):not(.mine){filter:brightness(1.3)}.ms-cell.open{background:var(--bg);cursor:default;border-color:#1e2235}.ms-cell.mine{background:#7f1d1d}.chess-info{display:flex;flex-direction:column;align-items:center;gap:10px;margin-bottom:20px}.chess-turn-indicator{background:var(--surface2);border:1px solid var(--border);border-radius:100px;padding:7px 20px;font-size:.95rem;font-weight:600;transition:border-color .3s}.chess-turn-indicator.white{border-color:#e8eaf6}.chess-turn-indicator.black{border-color:var(--accent)}.chess-msg{font-weight:700;font-size:1.05rem}.chess-msg.check{color:#fbbf24}.chess-msg.checkmate{color:#f87171}.chess-msg.stalemate{color:var(--text-muted)}.chess-wrapper{display:flex;gap:6px;width:-moz-fit-content;width:fit-content;margin:0 auto}.chess-ranks{justify-content:space-around;padding-bottom:26px}.chess-board-col,.chess-ranks{display:flex;flex-direction:column}.chess-files{display:flex;justify-content:space-around;margin-top:3px}.chess-label{font-size:.72rem;color:var(--text-muted);width:20px;text-align:center}.chess-board{display:grid;grid-template-columns:repeat(8,62px);grid-template-rows:repeat(8,62px);border:2px solid #1a1d27;border-radius:4px;overflow:hidden}.chess-sq{width:62px;height:62px;display:flex;align-items:center;justify-content:center;cursor:pointer;position:relative;transition:filter .1s}.chess-sq.light{background:#f0d9b5}.chess-sq.dark{background:#b58863}.chess-sq.sel{background:#f6f669!important}.chess-sq.last{background:hsla(60,89%,69%,.45)!important}.chess-sq.chk{background:rgba(220,38,38,.7)!important}.chess-sq:hover{filter:brightness(1.08)}.cp{font-size:2.6rem;line-height:1;-webkit-user-select:none;-moz-user-select:none;user-select:none;position:relative;z-index:1}.cp.white{color:#fff;text-shadow:0 0 3px #000,0 0 3px #000}.cp.black{color:#1a1a1a;text-shadow:0 0 2px #fffd,0 0 2px #fffd}.dot{position:absolute;width:20px;height:20px;border-radius:50%;background:rgba(0,0,0,.22);z-index:0}.dot.cap{width:56px;height:56px;background:transparent;border:4px solid rgba(0,0,0,.22)}@media (max-width:560px){.chess-board{grid-template-columns:repeat(8,40px);grid-template-rows:repeat(8,40px)}.chess-sq{width:40px;height:40px}.cp{font-size:1.7rem}.dot{width:14px;height:14px}.dot.cap{width:36px;height:36px}}.ttr-scores{justify-content:space-between;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 20px;margin-bottom:24px}.ttr-score,.ttr-scores{display:flex;align-items:center}.ttr-score{flex-direction:column;gap:4px;opacity:.45;transition:opacity .2s;min-width:56px}.ttr-score.active{opacity:1}.ttr-player{font-size:1.5rem;font-weight:800}.ttr-score.x .ttr-player{color:#60a5fa}.ttr-score.o .ttr-player{color:#f87171}.ttr-pts{font-size:1.6rem;font-weight:800;font-family:monospace;color:var(--text)}.ttr-status{font-size:1rem;font-weight:700;text-align:center}.ttr-status.x{color:#60a5fa}.ttr-status.o{color:#f87171}.ttr-status.draw{color:var(--text-muted)}.ttr-board{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:10px;gap:10px;width:100%}.ttr-cell{aspect-ratio:1;background:var(--surface2);border:2px solid var(--border);border-radius:12px;font-size:clamp(2rem,10vw,4rem);font-weight:900;cursor:pointer;transition:background .15s,transform .1s,border-color .15s;color:transparent}.ttr-cell:hover:not(.filled){background:var(--surface);border-color:var(--accent);transform:scale(1.03)}.ttr-cell.x{color:#60a5fa;border-color:#3b82f680}.ttr-cell.o{color:#f87171;border-color:#ef444480}.ttr-cell.win{border-color:#4ade80;background:#16a34a22;transform:scale(1.05)}.c4-scores{justify-content:space-between;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 20px;margin-bottom:20px}.c4-score,.c4-scores{display:flex;align-items:center}.c4-score{flex-direction:column;gap:4px;opacity:.4;transition:opacity .2s;min-width:72px}.c4-score.active{opacity:1}.c4-disc{width:22px;height:22px;border-radius:50%;display:inline-block}.c4-disc.p1{background:#ef4444;box-shadow:0 0 6px #ef444488}.c4-disc.p2{background:#facc15;box-shadow:0 0 6px #facc1588}.c4-label{font-size:.8rem;color:var(--text-muted)}.c4-pts{font-size:1.5rem;font-weight:800;font-family:monospace;color:var(--text)}.c4-status{font-size:1rem;font-weight:700;text-align:center}.c4-status.p1{color:#ef4444}.c4-status.p2{color:#facc15}.c4-status.draw{color:var(--text-muted)}.c4-board{background:#1e40af;border-radius:12px;padding:8px;width:-moz-fit-content;width:fit-content;margin:0 auto;box-shadow:0 8px 32px #1e40af66}.c4-col-btns{display:grid;grid-template-columns:repeat(7,60px);grid-gap:6px;gap:6px;margin-bottom:4px}.c4-col-btn{height:28px;background:transparent;border:none;border-radius:6px;cursor:pointer;font-size:1rem;color:transparent;transition:background .15s,color .15s}.c4-col-btn:not(:disabled):hover{background:hsla(0,0%,100%,.15)}.c4-col-btn.p1{color:#ef4444}.c4-col-btn.p2{color:#facc15}.c4-col-btn:disabled{cursor:not-allowed}.c4-grid{display:grid;grid-template-columns:repeat(7,60px);grid-template-rows:repeat(6,60px);grid-gap:6px;gap:6px}.c4-cell{background:#1e3a8a;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;width:60px;height:60px}.c4-cell .c4-disc{width:50px;height:50px;border-radius:50%;background:#172554;transition:background .2s,box-shadow .2s,transform .15s}.c4-cell .c4-disc.p1{background:#ef4444;box-shadow:0 0 10px #ef444499}.c4-cell .c4-disc.p2{background:#facc15;box-shadow:0 0 10px #facc1599}.c4-cell .c4-disc.ghost{opacity:.35}.c4-cell .c4-disc.win{transform:scale(1.1);box-shadow:0 0 18px currentColor}@media (max-width:520px){.c4-col-btns,.c4-grid{grid-template-columns:repeat(7,42px)}.c4-grid{grid-template-rows:repeat(6,42px)}.c4-cell{width:42px;height:42px}.c4-cell .c4-disc{width:34px;height:34px}.c4-col-btn{width:42px}}.tetris-wrap{display:flex;gap:10px;justify-content:center;margin-bottom:14px}.tetris-board{position:relative;border:2px solid var(--border);border-radius:4px;overflow:hidden;flex-shrink:0}.t-row{display:flex}.t-cell{width:clamp(22px,calc((min(100vw, 420px) - 120px) / 10),28px);height:clamp(22px,calc((min(100vw, 420px) - 120px) / 10),28px);border:1px solid #12162a;background:#0b0e1a;flex-shrink:0}.t-cell.on{box-shadow:inset 0 0 0 2px hsla(0,0%,100%,.18),inset 0 0 0 1px rgba(0,0,0,.3)}.t-cell.ghost{background:transparent;border-color:hsla(0,0%,100%,.1)}.tetris-overlay{position:absolute;inset:0;background:rgba(5,7,18,.82);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:10;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);gap:8px}.t-over{color:#f87171;font-weight:800;font-size:1.4rem}.t-score-final{color:var(--text-muted);font-size:1rem}.t-pause{color:var(--accent-light);font-weight:800;font-size:1.4rem}.tetris-side{display:flex;flex-direction:column;gap:8px;min-width:80px}.t-panel{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:7px 10px}.t-lbl{font-size:.6rem;color:var(--text-muted);font-weight:700;letter-spacing:.08em;margin-bottom:3px}.t-val{font-size:1.2rem;font-weight:800;font-family:monospace;color:var(--accent-light)}.t-next{flex-direction:column}.t-next,.t-next-row{display:flex;gap:1px}.t-nc{width:14px;height:14px;background:var(--bg);border-radius:2px}.tetris-ctrl{flex-direction:column;align-items:center;margin-bottom:8px}.t-ctrl-row,.tetris-ctrl{display:flex;gap:8px}.ctrl-btn{width:68px;height:68px;background:var(--surface2);border:1px solid var(--border);border-radius:14px;font-size:1.6rem;color:var(--text);cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;-moz-user-select:none;user-select:none;transition:background .1s,transform .08s;display:flex;align-items:center;justify-content:center}.ctrl-btn:active{background:var(--accent);transform:scale(.93)}.ctrl-btn.accent{background:var(--surface);color:var(--accent-light);border-color:var(--accent)}.ctrl-btn.wide{width:144px;font-size:1rem}