.fx-mega,.fx-drill{--navy:#0d2c54;--navy-deep:#0b1730;--teal:#0e7490;--teal-800:#155e75;--teal-50:#ecfeff;--cyan-300:#67e8f9;--violet:#7c3aed;--violet-700:#6d28d9;--violet-900:#4c1d95;--violet-50:#f5f3ff;--green:#15803d;--ink9:#0d2c54;--ink7:#334155;--ink6:#475569;--ink5:#64748b;--line:#e2e8f0;--soft:#f8fafc;--chip:#f1f5f9;--white:#fff;--g-action:linear-gradient(135deg, #7c3aed 0%, #6d28d9 50%, #4c1d95 100%);--sh-card:0 8px 24px 0 #0f172a14;--sh-feature:0 20px 48px 0 #0f172a24;--sh-action:0 8px 22px 0 #6d28d952;--display:var(--font-display), "General Sans", system-ui, sans-serif;--sans:var(--font-body), Switzer, system-ui, sans-serif;--c-sci:#0e7490;--c-maths:#7c3aed;--c-eng:#0d2c54;--c-hum:#334155;--wrap:1280px;--gut:32px}.mega-menu.fx-mega{text-align:left;width:min(1180px,100vw - 32px);overflow:hidden;padding:0!important}.fx-wrap{grid-template-columns:240px minmax(0,1fr) 290px;min-height:470px;display:grid}.fx-wrap>div{min-width:0}.fx-main{flex-direction:column;min-width:0;display:flex}.fx-rail{border-right:1px solid var(--line);background:#f8fafc;flex-direction:column;gap:2px;margin:0;padding:16px 10px;list-style:none;display:flex}.fx-rail button{width:100%;font:600 14.5px/1.25 var(--sans);color:var(--navy);cursor:pointer;text-align:left;background:0 0;border:0;border-radius:12px;justify-content:space-between;align-items:baseline;gap:10px;padding:12px;display:flex}.fx-rail button small{vertical-align:baseline;color:#64748b;margin-left:4px;font-size:12px;font-weight:500;line-height:1;display:inline}.fx-rail button:hover{background:#eef2f6}.fx-rail button[aria-selected=true]{color:var(--navy);background:#fff;box-shadow:0 1px 3px #0f172a1f}.fx-rail button[aria-selected=true]:after{content:"";border-top:2px solid var(--teal);border-right:2px solid var(--teal);align-self:center;width:7px;height:7px;transform:rotate(45deg)}.fx-rail button[aria-selected=true] small{display:none}.fx-pane{flex-direction:column;flex:auto;gap:0;min-width:0;padding:22px 28px 20px;display:flex}.fx-pane>.fx-pane-head,.fx-pane>.fx-seg{margin-bottom:14px}.fx-pane[hidden]{display:none}.fx-pane-head{justify-content:space-between;align-items:baseline;gap:16px;display:flex}.fx-pane-head a.t{font:600 20px/1.2 var(--display);color:var(--navy);letter-spacing:-.015em;text-decoration:none}.fx-pane-head a.t:hover{color:var(--teal)}.fx-pane-head p{color:var(--ink5);margin:4px 0 0;font-size:13px}.fx-seg{background:var(--chip);scrollbar-width:none;border-radius:999px;flex-wrap:nowrap;align-self:flex-start;gap:4px;min-width:0;max-width:100%;padding:4px;display:flex;overflow-x:auto}.fx-seg::-webkit-scrollbar{display:none}.fx-seg button{font:600 13px/1 var(--sans);color:var(--navy);cursor:pointer;white-space:nowrap;background:0 0;border:0;border-radius:999px;flex:none;padding:8px 13px;display:inline-block}.fx-seg button small{vertical-align:baseline;color:#64748b;margin-left:4px;font-size:12px;font-weight:500;line-height:1;display:inline}.fx-seg button[aria-selected=true]{background:#fff;box-shadow:0 1px 3px #0f172a26}.fx-list{grid-template-columns:repeat(3,minmax(0,1fr));gap:2px 18px;margin:0;padding:0;list-style:none;display:grid}.fx-list[hidden]{display:none}.fx-list a{border-radius:10px;flex-direction:column;gap:2px;padding:9px 3px;text-decoration:none;display:flex}.fx-list a:hover{background:var(--teal-50)}.fx-list a span{font:600 14.5px/1.2 var(--sans);color:var(--navy)}.fx-list a small{font:400 12px/1.3 var(--sans);color:var(--ink5)}.fx-list--wide{grid-template-columns:repeat(2,minmax(0,1fr))}.fx-pane .fx-foot{border-top:1px solid var(--line);flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:20px;padding-top:12px;display:flex}.fx-foot a{font:600 13.5px/1.3 var(--sans);color:var(--teal);text-decoration:none}.fx-foot a:hover{text-decoration:underline}.fx-foot a[hidden]{display:none}.fx-side{border-left:1px solid var(--line);background:#fff;flex-direction:column;gap:12px;padding:20px;display:flex}.fx-card{border-radius:16px;flex-direction:column;gap:8px;padding:16px;display:flex}.fx-card strong{font:600 15.5px/1.25 var(--display);color:var(--navy)}.fx-card p{color:var(--ink6);margin:0;font-size:13px;line-height:1.5}.fx-card--save{background:var(--teal-50);border:1px solid #a5f3fc}.fx-card--save ul{gap:4px;margin:0;padding:0;list-style:none;display:grid}.fx-card--save li{color:var(--ink7);justify-content:space-between;font-size:13px;display:flex}.fx-card--save li b{color:var(--teal-800)}.fx-card a{font:600 13.5px/1.3 var(--sans);color:var(--teal);text-decoration:none}.fx-live-trial{margin-top:auto}.fx-drill{max-width:100%;position:relative;overflow:hidden}.fx-screen{flex-direction:column;gap:6px;min-width:0;max-width:100%;display:flex}.fx-screen[hidden]{display:none}.fx-row{box-sizing:border-box;width:100%;max-width:100%;min-height:44px;font:600 17px/1.25 var(--display);color:var(--navy);text-align:left;cursor:pointer;background:0 0;border:0;border-bottom:1px solid #eef2f6;justify-content:space-between;align-items:center;gap:12px;padding:16px 4px;text-decoration:none;display:flex}.fx-row>span{min-width:0}.fx-row small{font:500 13px/1 var(--sans);color:var(--ink5);margin-left:auto}.fx-row:after{content:"";border-top:2px solid var(--navy);border-right:2px solid var(--navy);flex:none;width:8px;height:8px;transform:rotate(45deg)}.fx-back{min-height:44px;font:600 14px/1 var(--sans);color:var(--teal);cursor:pointer;background:0 0;border:0;align-items:center;gap:8px;padding:8px 0;display:inline-flex}.fx-back:before{content:"";border-bottom:2px solid var(--teal);border-left:2px solid var(--teal);width:8px;height:8px;transform:rotate(45deg)}.fx-screen>h4{font:700 22px/1.15 var(--display);color:var(--navy);letter-spacing:-.02em;margin:4px 0 2px}.fx-screen .fx-sub{color:var(--ink5);margin:0 0 6px;font-size:13px}.fx-mseg{grid-template-columns:1fr 1fr;gap:6px;margin:6px 0 4px;display:grid}.fx-mseg button{border:1.5px solid var(--line);min-height:44px;font:600 13.5px/1.2 var(--sans);color:var(--navy);text-align:left;cursor:pointer;background:#fff;border-radius:12px;flex-direction:column;gap:3px;padding:10px;display:flex}.fx-mseg button small{color:var(--ink5);font-size:12px;font-weight:500}.fx-mseg button[aria-selected=true]{border-color:var(--navy);background:var(--navy);color:#fff}.fx-mseg button[aria-selected=true] small{color:#cbd5e1}.fx-mlist{min-width:0;margin:0;padding:0;list-style:none}.fx-mlist[hidden]{display:none}.fx-mlist a{box-sizing:border-box;border-bottom:1px solid #eef2f6;justify-content:space-between;align-items:center;gap:10px;max-width:100%;min-height:44px;padding:14px 4px;text-decoration:none;display:flex}.fx-mlist a span{font:600 16px/1.25 var(--sans);color:var(--navy);min-width:0}.fx-mlist a small{color:var(--ink5);white-space:nowrap;font-size:12.5px}.fx-mall{box-sizing:border-box;min-height:44px;font:600 14.5px/1.3 var(--sans);color:var(--teal);padding:14px 4px;text-decoration:none;display:block}.fx-mall[hidden]{display:none}.fx-mega button:focus-visible,.fx-mega a:focus-visible,.fx-drill button:focus-visible,.fx-drill a:focus-visible{outline:2px solid var(--teal);outline-offset:2px}.mobile-drawer .mobile-drawer-nav{overflow-x:hidden}@media (max-width:1239px){.fx-seg button{padding:6px 10px;font-size:14px}}@media (max-width:1180px){.fx-wrap{grid-template-columns:220px minmax(0,1fr) 240px}.fx-pane{padding-left:14px;padding-right:14px}.fx-list{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:860px){.fx-mega,.fx-drill{--gut:16px}}