.home-bubble-launch{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:52px;padding:13px 22px;border:1px solid #ffffff70;border-radius:30px;background:#fff;color:#243b68;font:600 14px Poppins,sans-serif;box-shadow:0 7px 24px #132c6326;cursor:pointer;transition:transform .2s,box-shadow .2s}.home-bubble-launch:hover{transform:translateY(-3px);box-shadow:0 12px 28px #132c6340}.home-bubble-launch .nb-launch-dots{display:flex;align-items:center;width:37px;height:25px;position:relative}.nb-launch-dots i{position:absolute;width:18px;height:18px;border-radius:50%;background:radial-gradient(circle at 30% 25%,#bad6ff,#4977d6 60%,#284b9d);box-shadow:0 3px 5px #153e6c26}.nb-launch-dots i:nth-child(2){left:13px;top:0;width:13px;height:13px;background:radial-gradient(circle at 30% 25%,#c9f1e1,#268c73)}.nb-launch-dots i:nth-child(3){left:23px;top:13px;width:12px;height:12px;background:radial-gradient(circle at 30% 25%,#f3caff,#9a52b5)}
.nb-dialog{width:min(1040px,calc(100vw - 32px));max-width:1040px;max-height:calc(100dvh - 32px);padding:0;border:1px solid #fff;border-radius:26px;background:#f6f8fd;color:#233754;box-shadow:0 36px 120px #101e4d55;font-family:Poppins,sans-serif;overflow:auto;overscroll-behavior:contain}.nb-dialog::backdrop{background:#17243c99;backdrop-filter:blur(8px)}.nb-shell{padding:25px 35px 20px;background:radial-gradient(ellipse at 18% 40%,#e6edfbaa,transparent 55%),radial-gradient(ellipse at 85% 65%,#eae0f666,transparent 50%)}.nb-header{display:flex;align-items:center;justify-content:space-between;gap:12px}.nb-brand{display:flex;align-items:center;gap:8px;font-size:10px;letter-spacing:2px;font-weight:700;color:#6a7890}.nb-close{border:1px solid #dce2ed;border-radius:50%;width:38px;height:38px;background:#fff;color:#32435f;font:26px/1 sans-serif;cursor:pointer}.nb-heading{text-align:center;position:relative;margin:18px 0 0}.nb-heading h2{font:400 clamp(23px,3vw,32px)/1.35 Candal,sans-serif;letter-spacing:-.6px;margin:0 0 10px;color:#203354}.nb-heading p{font-size:13px;color:#65738b;margin:0}.nb-back{display:block;border:0;background:transparent;font:600 12px Poppins,sans-serif;color:#425c82;padding:8px;cursor:pointer;margin:0 auto 10px}.nb-back[hidden]{display:none}.nb-topics{display:grid;grid-template-columns:repeat(3,1fr);align-items:center;justify-items:center;gap:16px 35px;max-width:800px;margin:22px auto 24px;position:relative}.nb-topics:before{content:'';position:absolute;inset:35px 60px;border:1px solid #b6c5df55;border-radius:50%;transform:rotate(-15deg);pointer-events:none}.nb-slot{width:var(--nb-size);height:var(--nb-size);display:grid;place-items:center;position:relative;animation:nb-float 7s ease-in-out infinite;animation-delay:var(--nb-delay)}.nb-slot:nth-child(2){margin-top:18px}.nb-slot:nth-child(5){margin-top:-6px}.nb-orb{width:100%;height:100%;border-radius:50%;border:1px solid #ffffff75;background:radial-gradient(circle at 28% 20%,var(--nb-light) 0, var(--nb-color) 38%,var(--nb-dark) 92%);box-shadow:inset 0 2px 4px #ffffff70,inset -8px -14px 28px #071f3833,0 15px 22px -10px #263b7055;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:22px;color:#fff;font:600 14px/1.45 Poppins,sans-serif;text-shadow:0 1px 4px #14203c88;cursor:pointer;position:relative;transition:transform .25s,box-shadow .25s;isolation:isolate}.nb-orb:before{content:'';position:absolute;top:9%;left:18%;width:45%;height:20%;background:linear-gradient(160deg,#ffffff65,transparent);border-radius:50%;transform:rotate(-30deg);filter:blur(2px);z-index:-1}.nb-orb>i{font-size:27px}.nb-orb:hover{transform:scale(1.065);box-shadow:inset 0 2px 4px #ffffff70,inset -8px -14px 28px #071f3833,0 22px 34px -10px #263b7070}.nb-orb:focus-visible,.nb-destination:focus-visible,.nb-close:focus-visible,.nb-back:focus-visible,.home-bubble-launch:focus-visible{outline:3px solid #203d77;outline-offset:5px}.nb-slot:has(:hover),.nb-slot:has(:focus-visible){animation-play-state:paused}.nb-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid #dde4f0;padding-top:17px;font-size:11px;color:#79849a}.nb-footer a{color:#425d86;text-decoration:none;font-weight:600}.nb-footer a:hover{text-decoration:underline}
.nb-expanded{min-height:360px;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:16px auto 26px;animation:nb-reveal .35s ease-out}.nb-core{width:130px;height:130px;flex:0 0 auto;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;text-align:center;color:#fff;border-radius:50%;padding:20px;box-sizing:border-box;font-size:12px;font-weight:600;background:radial-gradient(circle at 25% 20%,var(--nb-light),var(--nb-color) 40%,var(--nb-dark));box-shadow:inset 0 2px 4px #ffffff70,0 14px 26px -12px #1c365b66;position:relative}.nb-core>i{font-size:25px}.nb-core:after{content:'';position:absolute;inset:-14px;border:1px solid color-mix(in srgb,var(--nb-color),transparent 65%);border-radius:50%;transform:rotateX(60deg) rotate(-20deg);pointer-events:none}.nb-destinations{display:grid;grid-template-columns:repeat(var(--nb-count),minmax(0,1fr));width:100%;max-width:800px;gap:18px;margin-top:28px;position:relative}.nb-destinations:before{content:'';position:absolute;left:12%;right:12%;top:46px;border-top:1px solid #b7c5db;z-index:0}.nb-destination{display:flex;flex-direction:column;align-items:center;text-align:center;gap:8px;color:#243a5b;text-decoration:none;position:relative;border-radius:18px;padding:0 5px 8px;animation:nb-satellite .4s both;animation-delay:calc(var(--nb-index)*60ms)}.nb-small-orb{width:94px;height:94px;border-radius:50%;display:grid;place-items:center;background:radial-gradient(circle at 28% 22%,#fff,var(--nb-light) 38%,var(--nb-color) 100%);box-shadow:inset 0 2px 3px #fff,0 10px 18px -10px #203d6e88;border:1px solid #ffffff99;color:var(--nb-dark);font-size:25px;transition:transform .2s,box-shadow .2s}.nb-destination:hover .nb-small-orb{transform:translateY(-5px) scale(1.05);box-shadow:inset 0 2px 3px #fff,0 15px 22px -10px #203d6e99}.nb-destination strong{font-size:13px;line-height:1.5}.nb-caption{font-size:10px;line-height:1.6;color:#6d7b91;max-width:150px}.nb-destination:hover strong{text-decoration:underline}@keyframes nb-float{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-8px) rotate(1deg)}}@keyframes nb-reveal{from{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}@keyframes nb-satellite{from{opacity:0;transform:translateY(-12px) scale(.8)}to{opacity:1;transform:translateY(0) scale(1)}}
@media(max-width:650px){.nb-dialog{width:calc(100vw - 20px);max-height:calc(100dvh - 20px);border-radius:20px}.nb-shell{padding:18px 17px}.nb-heading{margin-top:18px}.nb-heading h2{font-size:23px}.nb-heading p{font-size:11px}.nb-topics{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 8px;margin:26px auto}.nb-slot{width:calc(var(--nb-size)*.76);height:calc(var(--nb-size)*.76);max-width:100%}.nb-slot:nth-child(2),.nb-slot:nth-child(5){margin-top:0}.nb-orb{font-size:12px;padding:16px;gap:9px}.nb-orb>i{font-size:23px}.nb-footer{flex-direction:column;text-align:center;font-size:10px}.nb-brand{font-size:9px;letter-spacing:1.5px}.nb-destinations{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 12px}.nb-destinations:before{display:none}.nb-expanded{min-height:0;margin:25px auto}.nb-core{width:110px;height:110px;font-size:11px}.nb-small-orb{width:80px;height:80px}.nb-caption{font-size:10px}.home-bubble-launch{width:100%;font-size:12px}.nb-close{width:34px;height:34px}}
@media(prefers-reduced-motion:reduce){.nb-slot,.nb-expanded,.nb-destination{animation:none}.nb-orb,.nb-small-orb,.home-bubble-launch{transition:none}}
.nb-dialog .nb-footer{background:transparent;padding:17px 0 0;margin:0;color:#66758d;box-shadow:none}.nb-dialog .nb-footer a{color:#425d86}.nb-dialog .nb-footer span{color:inherit}
/* A compact, irregular molecule rather than evenly spaced tiles. */
.nb-topics{display:block;width:100%;max-width:660px;height:390px;margin:24px auto 18px}.nb-topics:before{inset:55px 65px 45px 80px;transform:rotate(-24deg)}.nb-topics .nb-slot{position:absolute;margin:0;width:var(--nb-size);height:var(--nb-size)}.nb-topics .nb-slot:nth-child(1){left:8%;top:4%;--nb-size:180px!important}.nb-topics .nb-slot:nth-child(2){left:38%;top:0;--nb-size:140px!important}.nb-topics .nb-slot:nth-child(3){left:60%;top:8%;--nb-size:204px!important}.nb-topics .nb-slot:nth-child(4){left:19%;top:49%;--nb-size:148px!important}.nb-topics .nb-slot:nth-child(5){left:42%;top:43%;--nb-size:182px!important}.nb-topics .nb-slot:nth-child(6){left:71%;top:61%;--nb-size:120px!important}.nb-topics .nb-slot:nth-child(6) .nb-orb{font-size:11px;padding:12px;gap:7px}.nb-topics .nb-slot:nth-child(6) i{font-size:20px}.nb-topics .nb-slot:nth-child(2) .nb-orb,.nb-topics .nb-slot:nth-child(4) .nb-orb{font-size:12px;padding:15px}
@media(max-width:650px){.nb-topics{max-width:340px;height:500px;margin:20px auto 4px}.nb-topics .nb-slot:nth-child(1){left:2%;top:4%;--nb-size:144px!important}.nb-topics .nb-slot:nth-child(2){left:48%;top:0;--nb-size:112px!important}.nb-topics .nb-slot:nth-child(3){left:45%;top:24%;--nb-size:154px!important}.nb-topics .nb-slot:nth-child(4){left:0;top:34%;--nb-size:122px!important}.nb-topics .nb-slot:nth-child(5){left:12%;top:61%;--nb-size:142px!important}.nb-topics .nb-slot:nth-child(6){left:63%;top:62%;--nb-size:108px!important}.nb-topics .nb-slot:nth-child(2) .nb-orb,.nb-topics .nb-slot:nth-child(4) .nb-orb{font-size:10px;padding:11px;gap:6px}.nb-topics .nb-slot:nth-child(2) i{font-size:19px}.nb-topics .nb-slot:nth-child(6) .nb-orb{font-size:10px}.nb-topics:before{inset:50px 30px 65px 35px}.nb-heading h2{font-size:22px}}
@media(max-width:360px){.nb-topics{zoom:.9;width:111%;margin-left:-5.5%}}
.nb-dialog .nb-sound{margin-left:auto;border:1px solid #dce2ed;border-radius:22px;background:#ffffffaa;padding:8px 12px;font:500 10px Poppins,sans-serif;color:#435773;display:inline-flex;align-items:center;gap:7px;cursor:pointer}.nb-dialog .nb-sound:focus-visible{outline:3px solid #203d77;outline-offset:3px}.nb-dialog .nb-sound[aria-pressed=false]{color:#738198}.nb-dialog .nb-header{gap:10px}.nb-dialog{overflow-x:hidden}
@media(max-width:650px){.nb-topics:before{transform:none}}
/* Tangent-circle packing: neighboring spheres touch without intersecting. */
.nb-topics{width:100%;max-width:524px;height:auto;aspect-ratio:524 / 375;margin:28px auto 28px;animation:nb-cluster-drift 8s ease-in-out infinite}.nb-topics:before{display:none}.nb-topics .nb-slot{animation:none;max-width:none;aspect-ratio:1;height:auto!important;margin:0;transform:none}.nb-topics .nb-orb{box-sizing:border-box}.nb-topics .nb-orb:hover{transform:none;filter:brightness(1.08)}
.nb-topics .nb-slot:nth-child(1){left:10.87786%;top:5.41333%;width:34.35115%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(2){left:45.22901%;top:10.74667%;width:26.71756%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(3){left:28.19656%;top:45.46469%;width:38.93130%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(4){left:0.07673%;top:48.89500%;width:28.24427%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(5){left:65.20432%;top:31.98331%;width:34.73282%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(6){left:70.01806%;top:0.01278%;width:22.90076%!important;height:auto!important}
@keyframes nb-cluster-drift{0%,100%{transform:translateY(0)}50%{transform:translateY(-4px)}}@media(max-width:650px){.nb-topics{max-width:524px;height:auto;aspect-ratio:524 / 375;margin:28px auto;zoom:1}.nb-topics .nb-orb{font-size:10px;padding:10px;gap:6px}.nb-topics .nb-orb>i{font-size:20px}.nb-topics .nb-slot:nth-child(2) .nb-orb,.nb-topics .nb-slot:nth-child(4) .nb-orb,.nb-topics .nb-slot:nth-child(6) .nb-orb{font-size:9px;padding:6px;gap:4px}.nb-topics .nb-slot:nth-child(6) i{font-size:16px}}@media(prefers-reduced-motion:reduce){.nb-topics{animation:none}}

.nb-dialog .nb-header{position:sticky;top:-25px;z-index:5;background:#f6f8fdf5;padding:4px 0;border-radius:12px}.nb-topics.nb-impact{animation-play-state:paused}@media(max-width:650px){.nb-dialog .nb-header{top:-18px}}
.nb-topics{aspect-ratio:524 / 450.1779445189653;height:auto!important}
.nb-topics .nb-slot:nth-child(1){left:10.87786%;top:21.16615%;width:34.35115%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(2){left:45.22901%;top:25.60884%;width:26.71756%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(3){left:28.19656%;top:54.52909%;width:38.93130%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(4){left:0.07673%;top:57.38655%;width:28.24427%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(5){left:65.20432%;top:43.29905%;width:34.73282%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(6){left:70.01806%;top:16.66747%;width:22.90076%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(7){left:34.37500%;top:0.06664%;width:24.80916%!important;height:auto!important}
.nb-topics .nb-slot:nth-child(7) .nb-orb{font-size:11px;padding:12px;gap:7px}.nb-topics .nb-slot:nth-child(7) i{font-size:20px}@media(max-width:650px){.nb-topics{aspect-ratio:524 / 450.1779445189653}.nb-topics .nb-slot:nth-child(7) .nb-orb{font-size:9px;padding:7px;gap:4px}.nb-topics .nb-slot:nth-child(7) i{font-size:17px}}

.nb-topics.nb-physics-active{animation-play-state:paused}.nb-topics .nb-slot{will-change:transform}

/* Profile sphere fits beside About and Learn without overlapping. */
.nb-topics .nb-slot:nth-child(8){left:17.36641%;top:1.11067%;width:17.17557%!important;height:auto!important}.nb-topics .nb-slot:nth-child(8) .nb-orb{font-size:11px;padding:8px;gap:5px}.nb-topics .nb-slot:nth-child(8) i{font-size:18px}@media(max-width:650px){.nb-topics .nb-slot:nth-child(8) .nb-orb{font-size:9px;padding:4px;gap:3px}.nb-topics .nb-slot:nth-child(8) i{font-size:15px}}

.nb-topics .nb-slot:nth-child(9){left:59.12%;top:3.04%;width:17.17557%!important;height:auto!important}.nb-topics .nb-slot:nth-child(9) .nb-orb{font-size:11px;padding:7px;gap:5px}.nb-topics .nb-slot:nth-child(9) i{font-size:18px}@media(max-width:650px){.nb-topics .nb-slot:nth-child(9) .nb-orb{font-size:9px;padding:4px;gap:3px}.nb-topics .nb-slot:nth-child(9) i{font-size:15px}}
/* The quiz sphere touches Profile and Learn, without covering either. */
.nb-topics .nb-slot:nth-child(10){left:1.74%;top:9.4%;width:17.17557%!important;height:auto!important}.nb-topics .nb-slot:nth-child(10) .nb-orb{font-size:11px;padding:7px;gap:5px}.nb-topics .nb-slot:nth-child(10) i{font-size:18px}@media(max-width:650px){.nb-topics .nb-slot:nth-child(10) .nb-orb{font-size:9px;padding:4px;gap:3px}.nb-topics .nb-slot:nth-child(10) i{font-size:15px}}