:root{--primary:#232f3e;--secondary:#ff9900;--bg:#f8f9fa;--text:#222;--correct:#2e7d32;--wrong:#c62828;--bookmark:#fbc02d;--vocab:#00897b;--clf:#e91e63;--saa:#1565c0;--sap:#673ab7}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Segoe UI,Roboto,Helvetica,Arial,sans-serif}a,button{font:inherit}.app-shell{min-height:100dvh;max-width:1280px;margin:0 auto;background:#fff;box-shadow:0 0 15px rgba(0,0,0,.05)}.app-header{position:-webkit-sticky;position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:var(--primary);color:#fff;box-shadow:0 2px 6px rgba(0,0,0,.1)}.logo{font-size:20px;font-weight:900}.logo-button{border:0;background:transparent;color:inherit;cursor:pointer}.logo span{color:var(--secondary)}.header-actions{display:flex;align-items:center;gap:10px}.timer{display:inline-flex;min-width:58px;justify-content:center;padding:4px 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