.arcade-library,.arcade-player{max-width:1400px;margin:42px auto;color:var(--sn-mode-ink,#e1edf6)}.arcade-library-heading,.arcade-player-header{display:flex;justify-content:space-between;align-items:center;gap:24px}.arcade-library h2,.arcade-player h1{font-size:clamp(25px,3vw,40px);line-height:1.2;margin:14px 0}.arcade-library p,.arcade-player p{color:var(--sn-mode-muted,#a9bdcf);line-height:1.7;font-size:14px}.arcade-pill{display:inline-flex;border:1px solid var(--sn-mode-border,#35516a);border-radius:99px;padding:7px 12px;font-size:11px;color:var(--sn-mode-ink,#bad3e5);white-space:nowrap}.arcade-toolbar{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-top:28px}.arcade-toolbar label{display:grid;gap:7px;font-size:12px}.arcade-library button,.arcade-library input,.arcade-player button{font:inherit;color:var(--sn-mode-ink,#dfeef6);border:1px solid var(--sn-mode-border,#33556d);border-radius:9px;background:var(--sn-mode-soft,#142c40);padding:11px 16px;min-height:44px}.arcade-library button,.arcade-player button{cursor:pointer}.arcade-library :is(button,input,a):focus-visible,.arcade-player :is(button,input,a,summary):focus-visible{outline:2px solid #8edff3;outline-offset:4px}.arcade-filters{display:flex;flex-wrap:wrap;gap:8px}.arcade-filters button[aria-pressed=true]{background:var(--sn-mode-cyan,#92e1ed);color:#072733}.arcade-game-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:22px 0}.arcade-game-card{display:flex;flex-direction:column;gap:12px;text-decoration:none;color:inherit;background:linear-gradient(140deg,var(--sn-mode-soft,#122e42),var(--sn-mode-surface,#0c1b2c));border:1px solid var(--sn-mode-border,#2b4a61);border-radius:18px;padding:26px;transition:border-color .15s,transform .15s}.arcade-game-card:hover{border-color:#8dddec;transform:translateY(-3px)}.arcade-card-top{display:flex;align-items:center;justify-content:space-between}.arcade-number{font:600 24px ui-monospace,monospace;color:var(--sn-mode-cyan,#79dce9)}.arcade-mechanic{text-transform:uppercase;letter-spacing:1.5px;font-size:10px;color:var(--sn-mode-muted,#83becf);margin-top:15px}.arcade-game-card h3{font-size:25px;margin:0}.arcade-game-card p{margin:0;flex:1}.arcade-card-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--sn-mode-border,#2b4a61);padding-top:18px;margin-top:12px;font-size:11px}.arcade-card-meta strong{color:var(--sn-mode-ink,#91e1ee)}.arcade-small{font-size:12px!important}.arcade-empty{padding:26px;border:1px dashed var(--sn-mode-border,#35516a);border-radius:14px}.arcade-mud-link{display:flex;justify-content:space-between;gap:20px;padding:24px;border:1px solid var(--sn-mode-border,#375575);border-radius:14px;text-decoration:none;color:var(--sn-mode-ink,#dfeef6);background:var(--sn-mode-surface,#0d1f32)}.arcade-mud-link span{color:var(--sn-mode-ink,#91e1ee);font-size:13px}.arcade-run-progress{display:flex;gap:18px;align-items:center;margin:26px 0;font-size:12px}.arcade-run-progress progress{flex:1;height:9px;accent-color:#84ddec}.arcade-round-heading h2{font-size:27px;margin:16px 0 24px}.arcade-workbench{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}.arcade-evidence{background:var(--sn-mode-canvas,#06141f);border:1px solid var(--sn-mode-border,#2a4c62);border-radius:14px;overflow:hidden}.arcade-file-heading{display:flex;justify-content:space-between;gap:12px;padding:15px 20px;background:var(--sn-mode-soft,#163046);font:11px ui-monospace,monospace;color:var(--sn-mode-ink,#91dce9)}.arcade-evidence pre{white-space:pre-wrap;overflow-wrap:anywhere;padding:24px;font:13px/1.9 ui-monospace,monospace;color:var(--sn-mode-ink,#d4e9ed);margin:0}.arcade-evidence p{padding:0 24px 12px;font-size:11px}.arcade-answer{padding:24px;background:var(--sn-mode-surface,#0d2032);border:1px solid var(--sn-mode-border,#2a4c62);border-radius:14px}.arcade-answer h3{font-size:19px;line-height:1.5;margin-top:0}.arcade-answer fieldset{border:0;padding:0;margin:20px 0;min-width:0}.arcade-option{display:flex;gap:12px;align-items:flex-start;padding:16px;margin:10px 0;border:1px solid var(--sn-mode-border,#32546c);border-radius:9px;line-height:1.6;font-size:13px;cursor:pointer}.arcade-option:has(input:checked){border-color:#8cdeef;background:var(--sn-mode-soft,#193c4c)}.arcade-option input{accent-color:#82ddeb;margin-top:4px;flex-shrink:0;width:18px;height:18px}.arcade-order{list-style:none;padding:0;display:grid;gap:12px}.arcade-order li{padding:14px;background:var(--sn-mode-soft,#173044);border:1px solid var(--sn-mode-border,#34576f);border-radius:9px;display:flex;justify-content:space-between;gap:12px;align-items:center;font-size:13px;line-height:1.6}.arcade-order li>div{display:flex;gap:6px;flex-shrink:0}.arcade-order button{padding:8px 12px}.arcade-player button:disabled{opacity:.45;cursor:default}.arcade-answer-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:20px 0}.arcade-player .arcade-primary{display:inline-block;text-decoration:none;padding:12px 18px;border-radius:9px;background:var(--sn-mode-cyan,#92e1ed);color:#092734;border:1px solid #92e1ed;min-height:44px;font-size:13px;font-weight:650}.arcade-feedback{background:var(--sn-mode-soft,#152c3c);border:1px solid #bb9671;border-radius:14px;padding:26px;margin-top:24px;scroll-margin-top:20px}.arcade-feedback[data-correct=true]{border-color:#79cba8}.arcade-feedback h3{font-size:17px;font-weight:500;line-height:1.8}.arcade-hint{padding:14px;border-left:3px solid #eacb8d;background:var(--sn-mode-surface,#252e35)}.arcade-finish{padding:28px;background:var(--sn-mode-surface,#0d2233);border:1px solid var(--sn-mode-border,#315771);border-radius:18px}.arcade-finish h2{font-size:64px;color:var(--sn-mode-ink,#92e1ed);margin:20px 0}.arcade-finish h2 small{font-size:22px}.arcade-finish details{border-bottom:1px solid var(--sn-mode-border,#34516a);padding:14px 0}.arcade-finish summary,.arcade-sources summary{cursor:pointer;min-height:44px;padding:12px 0;font-size:14px}.arcade-finish a{color:var(--sn-mode-ink,#8dddec)}.arcade-sources{margin-top:26px;border-top:1px solid var(--sn-mode-border,#2e4b60);padding-top:12px}.arcade-sources a{display:block;color:var(--sn-mode-ink,#92d8e7);font-size:13px;margin:14px 0}.arcade-sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}@media(max-width:1000px){.arcade-game-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.arcade-workbench{grid-template-columns:1fr}}@media(max-width:640px){.arcade-game-grid{grid-template-columns:1fr}.arcade-library-heading,.arcade-mud-link,.arcade-player-header,.arcade-toolbar{align-items:flex-start;flex-direction:column}.arcade-toolbar input,.arcade-toolbar label{width:100%}.arcade-run-progress{align-items:stretch;flex-direction:column}.arcade-answer,.arcade-game-card{padding:18px}.arcade-order li{align-items:flex-start;flex-direction:column}.arcade-answer-actions{align-items:stretch;flex-direction:column}.arcade-answer-actions>*{text-align:center}.arcade-player-header>.arcade-pill{white-space:normal}.arcade-filters button{padding:10px 13px}}@media(prefers-reduced-motion:reduce){.arcade-game-card{transition:none}.arcade-game-card:hover{transform:none}}.arcade-action-card{border-top:3px solid #73cfff}.action-card-firewall-tetris{border-top-color:#ffba7a}.action-card-patch-snake{border-top-color:#89e6b9}.action-card-network-battleship{border-top-color:#a5baff}.action-card-signal-match{border-top-color:#8d9fff}.action-card-firewall-gate{border-top-color:#ef9876}