:root{
    --nb-bg:#02060c;
    --nb-panel:rgba(6,17,29,.84);
    --nb-panel-strong:rgba(5,15,27,.96);
    --nb-line:rgba(91,201,255,.16);
    --nb-line-hot:rgba(91,201,255,.52);
    --nb-text:#edf8ff;
    --nb-muted:#7e9eaf;
    --nb-blue:#52ccff;
    --nb-cyan:#7bf3ff;
    --nb-green:#5be49b;
}

*{
    box-sizing:border-box;
}

html,
body{
    margin:0;
    min-height:100%;
}

body{
    background:
        radial-gradient(
            circle at 50% 5%,
            rgba(32,112,160,.22),
            transparent 34%
        ),
        radial-gradient(
            circle at 100% 38%,
            rgba(42,177,230,.08),
            transparent 32%
        ),
        linear-gradient(
            180deg,
            #02060c,
            #030a13 48%,
            #02060c
        );
    color:var(--nb-text);
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    overflow-x:hidden;
}

body::before{
    content:"";
    position:fixed;
    inset:-100px;
    pointer-events:none;
    background-image:
        radial-gradient(
            circle,
            rgba(105,221,255,.25) 1px,
            transparent 1px
        );
    background-size:38px 38px;
    opacity:.24;
    animation:nb-field 30s linear infinite;
}

@keyframes nb-field{
    from{
        transform:translate3d(0,0,0);
    }

    to{
        transform:translate3d(38px,38px,0);
    }
}

.nb-shell{
    width:min(1480px,calc(100% - 24px));
    margin:0 auto;
    padding:14px 0 30px;
    position:relative;
    z-index:1;
}

.nb-topbar,
.nb-panel,
.nb-intro{
    border:1px solid var(--nb-line);
    background:
        linear-gradient(
            180deg,
            rgba(255,255,255,.025),
            rgba(255,255,255,.004)
        ),
        var(--nb-panel);
    backdrop-filter:blur(18px);
    box-shadow:
        0 24px 70px rgba(0,0,0,.24),
        inset 0 1px rgba(255,255,255,.025);
}

.nb-topbar{
    min-height:64px;
    border-radius:18px;
    padding:10px 14px;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:14px;
}

.nb-brand{
    display:flex;
    align-items:center;
    gap:11px;
}

.nb-brand-atom{
    width:40px;
    height:40px;
    display:grid;
    place-items:center;
    border-radius:50%;
    border:1px solid var(--nb-line-hot);
    color:var(--nb-cyan);
    font-size:1.4rem;
    box-shadow:
        inset 0 0 20px rgba(82,204,255,.12),
        0 0 22px rgba(82,204,255,.12);
}

.nb-brand strong,
.nb-brand span{
    display:block;
}

.nb-brand strong{
    font-size:.92rem;
}

.nb-brand span{
    margin-top:2px;
    font-size:.69rem;
    color:var(--nb-muted);
}

.nb-nav{
    display:flex;
    gap:5px;
    overflow:auto;
}

.nb-nav a{
    color:#9bb6c5;
    text-decoration:none;
    white-space:nowrap;
    padding:9px 11px;
    border-radius:9px;
    font-size:.78rem;
}

.nb-nav a.active{
    color:white;
    background:rgba(54,176,229,.13);
    box-shadow:inset 0 -2px var(--nb-blue);
}

.nb-intro{
    border-radius:20px;
    margin-top:14px;
    padding:22px;
    min-height:170px;
    display:grid;
    grid-template-columns:1fr auto;
    align-items:center;
    gap:20px;
    overflow:hidden;
}

.nb-eyebrow,
.nb-label{
    display:block;
    color:var(--nb-blue);
    font-size:.68rem;
    text-transform:uppercase;
    font-weight:800;
    letter-spacing:.14em;
}

.nb-intro h1{
    margin:7px 0;
    font-size:clamp(2rem,5vw,4.5rem);
    letter-spacing:-.05em;
}

.nb-intro p{
    color:var(--nb-muted);
    max-width:720px;
    line-height:1.55;
    margin:0;
}

.nb-nucleus-mark{
    width:120px;
    height:120px;
    position:relative;
    display:grid;
    place-items:center;
}

.nb-nucleus-mark span{
    width:58px;
    height:58px;
    display:grid;
    place-items:center;
    border-radius:50%;
    background:#081826;
    border:1px solid var(--nb-line-hot);
    color:var(--nb-cyan);
    font-size:1.7rem;
    font-weight:900;
    box-shadow:
        0 0 40px rgba(74,206,255,.2),
        inset 0 0 22px rgba(74,206,255,.14);
}

.nb-nucleus-mark i{
    position:absolute;
    width:112px;
    height:40px;
    border:1px solid rgba(104,219,255,.32);
    border-radius:50%;
}

.nb-nucleus-mark i:nth-child(2){
    transform:rotate(60deg);
}

.nb-nucleus-mark i:nth-child(3){
    transform:rotate(120deg);
}

.nb-nucleus-mark{
    animation:nucleus-float 5s ease-in-out infinite;
}

@keyframes nucleus-float{
    0%,100%{
        transform:translateY(0);
    }

    50%{
        transform:translateY(-7px);
    }
}

.nb-grid{
    display:grid;
    grid-template-columns:300px minmax(0,1fr) 320px;
    gap:14px;
    margin-top:14px;
}

.nb-panel{
    border-radius:18px;
    padding:14px;
    min-width:0;
}

.nb-panel-heading{
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:12px;
    margin-bottom:12px;
}

.nb-panel h2{
    margin:4px 0 0;
    font-size:1rem;
}

.nb-count{
    min-width:36px;
    padding:6px 9px;
    border-radius:999px;
    text-align:center;
    background:rgba(52,165,219,.1);
    border:1px solid var(--nb-line);
    color:var(--nb-cyan);
    font-size:.72rem;
}

.nb-search{
    width:100%;
    border:1px solid var(--nb-line);
    background:rgba(2,9,16,.78);
    color:white;
    border-radius:10px;
    padding:10px;
    outline:none;
    margin-bottom:10px;
}

.nb-search:focus{
    border-color:var(--nb-line-hot);
}

.nb-elements{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:7px;
    max-height:600px;
    overflow:auto;
}

.nb-element{
    min-height:76px;
    border:1px solid var(--nb-line);
    border-radius:10px;
    background:rgba(4,15,25,.72);
    color:white;
    cursor:pointer;
    padding:6px;
    transition:
        transform .15s ease,
        border-color .15s ease,
        box-shadow .15s ease;
}

.nb-element:hover,
.nb-element.active{
    transform:translateY(-2px);
    border-color:var(--nb-blue);
    box-shadow:
        0 0 18px rgba(82,204,255,.13),
        inset 0 0 16px rgba(82,204,255,.06);
}

.nb-element-number{
    display:block;
    color:var(--nb-muted);
    font-size:.58rem;
    text-align:left;
}

.nb-element strong{
    display:block;
    font-size:1.35rem;
    color:#dff7ff;
    margin:4px 0;
}

.nb-element-name{
    display:block;
    color:#91adbc;
    font-size:.58rem;
    overflow:hidden;
    white-space:nowrap;
    text-overflow:ellipsis;
}

.nb-composition{
    min-height:650px;
}

.nb-view-state{
    display:flex;
    align-items:center;
    gap:5px;
    color:var(--nb-muted);
    font-size:.67rem;
}

.nb-view-state span,
.nb-view-state strong{
    padding:6px 8px;
    border-radius:7px;
    border:1px solid var(--nb-line);
}

.nb-view-state strong{
    color:white;
    border-color:var(--nb-line-hot);
    background:rgba(46,165,220,.15);
}

.nb-atomic-stage{
    min-height:500px;
    position:relative;
    display:grid;
    place-items:center;
    overflow:hidden;
}

.nb-atomic-stage::before{
    content:"";
    position:absolute;
    width:420px;
    height:420px;
    border-radius:50%;
    background:
        radial-gradient(
            circle,
            rgba(82,204,255,.09),
            transparent 63%
        );
}

.nb-selected-atom{
    width:150px;
    height:150px;
    border-radius:50%;
    position:relative;
    z-index:5;
    display:grid;
    place-items:center;
    align-content:center;
    background:
        radial-gradient(
            circle at 35% 28%,
            #24465c,
            #081722 67%,
            #02070b
        );
    border:1px solid rgba(174,236,255,.5);
    box-shadow:
        inset -20px -20px 30px rgba(0,0,0,.35),
        inset 12px 12px 25px rgba(255,255,255,.07),
        0 0 60px rgba(75,211,255,.25);
    animation:atom-breathe 3s ease-in-out infinite;
}

@keyframes atom-breathe{
    0%,100%{
        box-shadow:
            inset -20px -20px 30px rgba(0,0,0,.35),
            inset 12px 12px 25px rgba(255,255,255,.07),
            0 0 40px rgba(75,211,255,.18);
    }

    50%{
        box-shadow:
            inset -20px -20px 30px rgba(0,0,0,.35),
            inset 12px 12px 25px rgba(255,255,255,.07),
            0 0 75px rgba(75,211,255,.34);
    }
}

.nb-selected-atom small{
    position:absolute;
    top:29px;
    left:37px;
    color:#7897a9;
    font-size:.72rem;
}

.nb-selected-atom strong{
    font-size:3.7rem;
    color:var(--nb-cyan);
    line-height:1;
}

.nb-selected-atom span{
    color:#a9c4d1;
    font-size:.72rem;
    margin-top:6px;
}

.nb-orbit{
    position:absolute;
    width:390px;
    height:150px;
    border:1px solid rgba(91,207,255,.23);
    border-radius:50%;
    animation:orbit-spin 15s linear infinite;
}

.orbit-b{
    transform:rotate(60deg);
    animation-duration:19s;
}

.orbit-c{
    transform:rotate(120deg);
    animation-duration:23s;
}

@keyframes orbit-spin{
    from{
        rotate:0deg;
    }

    to{
        rotate:360deg;
    }
}

.nb-electron{
    position:absolute;
    width:10px;
    height:10px;
    border-radius:50%;
    background:white;
    box-shadow:
        0 0 6px white,
        0 0 16px var(--nb-cyan);
}

.electron-a{
    animation:electron-a 7s linear infinite;
}

.electron-b{
    animation:electron-b 9s linear infinite;
}

.electron-c{
    animation:electron-c 11s linear infinite;
}

@keyframes electron-a{
    0%{ transform:translate(190px,0); }
    25%{ transform:translate(0,74px); }
    50%{ transform:translate(-190px,0); }
    75%{ transform:translate(0,-74px); }
    100%{ transform:translate(190px,0); }
}

@keyframes electron-b{
    0%{ transform:translate(150px,-105px); }
    25%{ transform:translate(60px,100px); }
    50%{ transform:translate(-150px,105px); }
    75%{ transform:translate(-60px,-100px); }
    100%{ transform:translate(150px,-105px); }
}

@keyframes electron-c{
    0%{ transform:translate(-140px,-110px); }
    25%{ transform:translate(80px,-92px); }
    50%{ transform:translate(140px,110px); }
    75%{ transform:translate(-80px,92px); }
    100%{ transform:translate(-140px,-110px); }
}

.nb-field-copy{
    position:absolute;
    left:20px;
    bottom:18px;
    z-index:8;
}

.nb-field-copy span{
    color:var(--nb-blue);
    font-size:.62rem;
    letter-spacing:.12em;
    font-weight:800;
}

.nb-field-copy strong{
    display:block;
    margin-top:5px;
    font-size:1rem;
}

.nb-field-copy p{
    color:var(--nb-muted);
    font-size:.72rem;
    margin:4px 0 0;
}

.nb-composition-status{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:8px;
}

.nb-composition-status div{
    border:1px solid var(--nb-line);
    border-radius:9px;
    background:rgba(2,9,16,.62);
    padding:10px;
}

.nb-composition-status span,
.nb-composition-status strong{
    display:block;
}

.nb-composition-status span{
    color:var(--nb-muted);
    font-size:.62rem;
}

.nb-composition-status strong{
    margin-top:3px;
    color:var(--nb-green);
    font-size:.72rem;
}

.nb-stack{
    display:grid;
    gap:14px;
    align-content:start;
}

.nb-observation textarea{
    width:100%;
    min-height:180px;
    margin-top:12px;
    border:1px solid var(--nb-line);
    border-radius:11px;
    background:rgba(1,8,14,.74);
    color:white;
    padding:12px;
    line-height:1.55;
    resize:vertical;
    outline:none;
}

.nb-observation textarea:focus{
    border-color:var(--nb-line-hot);
}

.nb-observation button{
    width:100%;
    margin-top:8px;
    border:1px solid var(--nb-line-hot);
    background:rgba(36,141,194,.18);
    color:white;
    padding:10px 12px;
    border-radius:9px;
    cursor:pointer;
    font-weight:700;
}

.nb-muted{
    color:var(--nb-muted);
    font-size:.7rem;
    line-height:1.4;
}

.nb-properties{
    margin:12px 0 0;
}

.nb-properties div{
    display:grid;
    grid-template-columns:1fr auto;
    gap:10px;
    border-bottom:1px solid var(--nb-line);
    padding:9px 0;
}

.nb-properties dt{
    color:var(--nb-muted);
    font-size:.73rem;
}

.nb-properties dd{
    margin:0;
    color:white;
    font-size:.73rem;
}

.nb-footer{
    margin-top:14px;
    display:flex;
    justify-content:space-between;
    gap:12px;
    color:var(--nb-muted);
    font-size:.68rem;
    padding:8px 4px;
}

.nb-footer strong{
    color:#a7c9da;
    text-align:center;
}

@media(max-width:1050px){
    .nb-grid{
        grid-template-columns:260px 1fr;
    }

    .nb-stack{
        grid-column:1/-1;
        grid-template-columns:1fr 1fr;
    }
}

@media(max-width:760px){
    .nb-topbar{
        align-items:flex-start;
        flex-direction:column;
    }

    .nb-nav{
        width:100%;
    }

    .nb-intro{
        grid-template-columns:1fr;
    }

    .nb-nucleus-mark{
        display:none;
    }

    .nb-grid{
        grid-template-columns:1fr;
    }

    .nb-elements{
        grid-template-columns:repeat(6,1fr);
        max-height:330px;
    }

    .nb-composition{
        min-height:570px;
    }

    .nb-atomic-stage{
        min-height:430px;
    }

    .nb-stack{
        grid-template-columns:1fr;
    }
}

@media(max-width:520px){
    .nb-shell{
        width:calc(100% - 10px);
    }

    .nb-elements{
        grid-template-columns:repeat(4,1fr);
    }

    .nb-orbit{
        width:285px;
        height:112px;
    }

    .nb-selected-atom{
        width:125px;
        height:125px;
    }

    .nb-selected-atom strong{
        font-size:3rem;
    }

    .electron-a,
    .electron-b,
    .electron-c{
        display:none;
    }

    .nb-composition-status{
        grid-template-columns:1fr;
    }

    .nb-footer{
        flex-direction:column;
        text-align:center;
    }
}