:root{--navy:#12243a;--blue:#185ac5;--purple:#7040b8;--line:#d7e2ef;--soft:#f3f7fc}*{box-sizing:border-box}body{margin:0;background:linear-gradient(145deg,#edf5ff,#f7f2ff);color:var(--navy);font-family:Arial,sans-serif;min-height:100vh}.site-header{height:68px;display:flex;align-items:center;justify-content:space-between;padding:0 22px;background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:5px;color:var(--navy);text-decoration:none;font-weight:900;letter-spacing:.04em}.brand b{display:grid;place-items:center;width:40px;height:40px;border-radius:11px;background:var(--blue);color:#fff;font-size:21px}.home-link,.back-link{color:var(--blue);font-weight:800;text-decoration:none}.back-link{border:0;background:none;padding:0;cursor:pointer;font-size:1rem}main{width:min(960px,calc(100% - 24px));margin:28px auto}.panel{background:#fff;border:1px solid var(--line);border-radius:24px;padding:clamp(20px,4vw,38px);box-shadow:0 18px 45px #17385c14}.panel[hidden]{display:none}.eyebrow{margin:0 0 7px;color:var(--purple);font-weight:900;letter-spacing:.14em;text-transform:uppercase;font-size:.78rem}h1{margin:0 0 8px;font-size:clamp(2rem,6vw,3.5rem)}.library{text-align:center}.game-card{width:min(100%,430px);margin:28px auto 0;padding:24px;border:2px solid #bdd2ed;border-radius:20px;background:#f8fbff;color:var(--navy);display:grid;gap:7px;text-align:left;cursor:pointer}.game-card:hover{border-color:var(--blue);transform:translateY(-2px)}.game-card strong{font-size:1.6rem}.game-card small{font-size:1rem;line-height:1.4}.game-icon{color:#36a867;letter-spacing:.35em;font-size:1.5rem}.setup-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:24px 0}.setup-grid label,.pile-inputs label{display:grid;gap:6px;font-weight:800}select,input{width:100%;padding:12px;border:2px solid #c7d7e9;border-radius:11px;background:#fff;color:var(--navy);font:inherit}fieldset{border:1px solid var(--line);border-radius:16px;padding:18px}legend{font-weight:900}.pile-inputs{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.setup-actions{display:flex;gap:12px;margin-top:20px}.primary,.secondary{border:0;border-radius:12px;padding:13px 20px;font-weight:900;font-size:1rem;cursor:pointer}.primary{background:var(--blue);color:#fff}.primary:disabled{opacity:.45}.secondary{background:#e9f1fb;color:#174c96}.game-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.game-heading h1{font-size:2.4rem}.badge{padding:8px 13px;border-radius:999px;background:#efe6fc;color:#592b91;font-weight:900}.turn-status{text-align:center;font-size:1.25rem;font-weight:900;color:#174c96}.nim-board{min-height:300px;display:flex;align-items:end;justify-content:center;gap:clamp(10px,4vw,34px);padding:20px 4px}.pile{min-width:100px;border:2px solid transparent;border-radius:17px;background:#f5f8fc;padding:12px;cursor:pointer;color:var(--navy)}.pile:hover:not(:disabled),.pile.selected{border-color:var(--purple);background:#f5effd}.pile.computer-move{border-color:#e28620;background:#fff5e6}.tokens{height:240px;display:flex;flex-direction:column-reverse;align-items:center;justify-content:start;gap:4px;margin-top:10px}.token{display:block;width:46px;height:15px;border-radius:999px;background:linear-gradient(90deg,#32b96d,#64d694);box-shadow:inset 0 -2px #18874a;transition:opacity .45s,transform .45s}.token.removing{opacity:0;transform:translateY(-25px) scale(.5)}.move-controls{max-width:560px;margin:0 auto;padding:16px;border-radius:16px;background:var(--soft);text-align:center}.remove-choices{display:flex;flex-wrap:wrap;justify-content:center;gap:7px;margin:10px}.remove-choices button{width:42px;height:42px;border:2px solid #bfd0e5;border-radius:10px;background:#fff;font-weight:900;cursor:pointer}.remove-choices button.selected{border-color:var(--purple);background:var(--purple);color:#fff}.game-result{text-align:center;margin-top:18px;padding:22px;border-radius:18px;background:#eef9f2}.game-result div{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}details{margin-top:24px;color:#455e78}summary{font-weight:900;cursor:pointer}@media(max-width:650px){main{margin:12px auto}.setup-grid{grid-template-columns:1fr}.pile-inputs{grid-template-columns:repeat(3,1fr)}.nim-board{min-height:245px;gap:5px}.pile{min-width:64px;padding:8px}.tokens{height:190px}.token{width:35px}.game-heading{align-items:start}.game-heading h1{font-size:2rem}.site-header{padding:0 12px}}

.quick-setup-panel{max-width:820px;margin-inline:auto}.quick-setup-intro{max-width:620px;margin:16px auto 20px;text-align:center}.quick-setup-intro h1{font-size:clamp(2rem,5vw,3.2rem)}.quick-setup-intro>p:last-child{margin:0;color:#526a84;font-size:1.08rem}.quick-start-card{max-width:620px;margin:0 auto;padding:clamp(18px,4vw,30px);border:2px solid var(--line);border-radius:20px;background:#fff;box-shadow:0 14px 34px #17385c12}.opponent-field{display:grid;gap:8px}.quick-field-label,.quick-setup-grid label{font-weight:900}.opponent-toggle{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:5px;border-radius:14px;background:#edf3fa}.opponent-toggle button{min-height:48px;border:2px solid transparent;border-radius:10px;background:transparent;color:#314b68;font:inherit;font-weight:900;cursor:pointer}.opponent-toggle button.selected{border-color:#10151c;background:#10151c;color:#fff;box-shadow:0 4px 12px #10151c25}.quick-setup-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}.quick-setup-grid label{display:grid;align-content:start;gap:7px}.quick-fieldset{margin-top:18px}.quick-ready-row{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:18px;padding:12px 14px;border:1px solid #bfd5ef;border-radius:13px;background:#eff6ff;color:#174c96;font-weight:850}.quick-ready-row .secondary{flex:0 0 auto;padding:10px 14px}.quick-ready-static{justify-content:center}.quick-start-button{width:100%;min-height:52px;margin-top:14px}.quick-start-card>.mine-levels{margin-top:0}

@media(max-width:560px){.quick-setup-grid{grid-template-columns:1fr}.quick-ready-row{align-items:stretch;flex-direction:column;text-align:center}}