:root{--navy:#06182e;--navy2:#0d2946;--gold:#ffc51d;--red:#d93d36;--blue:#28a9e0;--ivory:#fbf8ef;--ink:#eaf4ff;--muted:#b8c9da;--panel:rgba(4,17,34,.91);--green:#49b866;--focus:#fff176}*{box-sizing:border-box}html,body{min-height:100%;margin:0}body{background:#03101e;color:var(--ink);font-family:Arial,"Helvetica Neue",sans-serif;overflow-x:hidden}.skip-link{position:fixed;top:-70px;left:12px;z-index:1000;padding:10px 14px;background:#fff;color:#000}.skip-link:focus{top:12px}.game-header{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:10px clamp(16px,3vw,42px);border-bottom:2px solid #274765;background:linear-gradient(180deg,#07182d,#040e1d);position:relative;z-index:40}.brand{display:flex;flex-direction:column;color:#fff;text-decoration:none}.brand strong{font-family:Impact,"Arial Black",sans-serif;font-size:clamp(25px,3vw,42px);letter-spacing:1px;line-height:.9}.brand strong span{color:var(--red)}.brand small{margin-top:6px;color:var(--gold);font-size:10px;font-weight:900;letter-spacing:2.2px}.header-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:7px}.utility-button,.teacher-toolbar button,.choice-action,.dialog-actions button{min-height:40px;padding:9px 13px;border:2px solid #6b89a7;border-radius:5px;background:#102943;color:#fff;font-weight:900;cursor:pointer;text-decoration:none}.utility-button:hover,.teacher-toolbar button:hover,.choice-action:hover{border-color:var(--gold);transform:translateY(-1px)}button:focus-visible,a:focus-visible,.choice-card:focus-visible{outline:4px solid var(--focus);outline-offset:3px}.game-shell{min-height:calc(100vh - 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