:root{
--bg:#07101b;
--bg2:#0d1726;
--panel:#0c1421;
--panel2:#101b2d;
--line:rgba(120,150,210,.18);
--text:#ecf3ff;
--muted:#9fb3d7;
--accent:#76d1ff;
--accent2:#8ee144;
--accent3:#a58dff;
--danger:#ff8e8e;
--shadow:0 22px 60px rgba(0,0,0,.32);
--radius:22px;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif;
color:var(--text);
background:
radial-gradient(circle at 18% 0%, rgba(70,104,170,.22), transparent 30%),
radial-gradient(circle at 82% 10%, rgba(122,214,255,.14), transparent 28%),
linear-gradient(180deg,#08111d 0%, #07101a 30%, #040810 100%);
}
.app{
display:grid;
grid-template-columns:minmax(0,1fr) 410px;
gap:16px;
height:100%;
padding:16px;
}
.panel{
background:linear-gradient(180deg,rgba(14,24,40,.96),rgba(8,13,24,.96));
border:1px solid var(--line);
border-radius:var(--radius);
box-shadow:var(--shadow);
overflow:hidden;
min-height:0;
}
.stage{position:relative;min-height:0}
#view{display:block;width:100%;height:100%}
.view-wrap{position:relative;height:100%}
.sidebar{display:flex;flex-direction:column;min-height:0}
.head{
display:flex;
align-items:center;
justify-content:space-between;
gap:14px;
padding:16px 18px;
border-bottom:1px solid rgba(120,150,210,.12);
background:linear-gradient(180deg,rgba(255,255,255,.03),rgba(255,255,255,0));
}
.head h1,.head h2,.head h3{margin:0}
.head h1{font-size:18px;font-weight:700;line-height:1.25}
.head small{color:var(--muted);display:block;margin-top:6px;font-size:12px;line-height:1.55}
.scroll{padding:14px;overflow:auto;display:flex;flex-direction:column;gap:14px}
.section{
background:linear-gradient(180deg,rgba(11,18,31,.96),rgba(8,13,24,.96));
border:1px solid rgba(132,172,235,.13);
border-radius:18px;
padding:14px;
}
.section h3{margin:0 0 10px;font-size:14px;font-weight:700;line-height:1.3}
.section p{margin:0;color:#dbe6ff;line-height:1.45;font-size:13px}
label{display:flex;flex-direction:column;gap:6px;font-size:12px;color:var(--muted)}
input,select,button,textarea{
width:100%;
font:inherit;
color:var(--text);
background:#0a1322;
border:1px solid rgba(115,150,212,.22);
border-radius:12px;
padding:9px 10px;
outline:none;
}
input[type="range"]{padding:0}
button{
cursor:pointer;
background:linear-gradient(180deg,#13223e,#0c1830);
transition:.16s ease;
}
button:hover{transform:translateY(-1px);border-color:rgba(149,212,255,.44)}
button.ghost{background:#0a1322}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.check{
display:flex;
align-items:center;
gap:10px;
padding:10px 12px;
border-radius:14px;
background:#0a1322;
border:1px solid rgba(115,150,212,.16);
color:#dce6fb;
font-size:12px;
}
.check input{width:auto;margin:0}
.note{
font-size:12px;
line-height:1.55;
color:#d5e5ff;
border:1px solid rgba(125,211,252,.18);
background:rgba(125,211,252,.06);
padding:11px 12px;
border-radius:14px;
}
.guide-card{border:1px solid rgba(130,171,236,.18);background:linear-gradient(180deg,rgba(17,26,47,.82),rgba(8,12,22,.72));box-shadow:0 18px 42px rgba(0,0,0,.22)}
.guide-kicker{font-size:12px;letter-spacing:.04em;text-transform:none;color:#9dc5ff;margin-bottom:8px;font-weight:600}
.guide-heading{font-size:18px;line-height:1.28;margin:0 0 8px;font-weight:700}
.guide-text{font-size:13px;line-height:1.62;color:#dce6fb}
.guide-text p{margin:0 0 10px}
.guide-callout{margin-top:10px;padding:11px 12px;border-radius:14px;background:rgba(79,120,219,.10);border:1px solid rgba(140,196,255,.20);color:#e8f1ff;font-size:13px;line-height:1.55}
.guide-nav-top{display:flex;justify-content:flex-start;margin-top:14px}
.tutorialStepTag{display:inline-flex;align-items:center;min-width:96px;padding:10px 14px;border-radius:14px;background:rgba(32,49,90,.55);border:1px solid rgba(145,187,255,.22);box-shadow:none;font-size:12px;font-weight:700;color:#eef5ff;line-height:1.05;text-align:left}
.tutorialActions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
.tbtn{width:100%;padding:12px 14px;border-radius:12px;border:1px solid rgba(120,160,230,.18);font-weight:700;font-size:13px;letter-spacing:0;color:#eaf2ff;background:linear-gradient(180deg,#13223e,#0c1830);box-shadow:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.tbtn.ghost{background:linear-gradient(180deg,#101d34,#0a1426)}
.tbtn.primary{background:linear-gradient(180deg,#79f0ff,#6e7dff);color:#07101b;border-color:rgba(188,240,255,.72);box-shadow:none}
.tbtn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.guide-float{display:none}
.guide-float-step{font-size:10px;text-transform:uppercase;letter-spacing:.12em;color:#9dc5ff;margin-bottom:6px}
.guide-float-title{font-size:18px;font-weight:800;line-height:1.15;color:#f4f8ff}
.guide-float-text{margin-top:6px;font-size:12px;line-height:1.5;color:#dbe7fb}
.overlay{position:absolute;left:18px;right:18px;bottom:18px;display:flex;flex-wrap:wrap;gap:8px;pointer-events:none}
.chip{padding:8px 12px;font-size:12px;border-radius:999px;background:rgba(8,14,24,.72);border:1px solid rgba(132,172,235,.18);color:#dce8ff;backdrop-filter:blur(10px)}
.equation-banner{position:absolute;right:18px;top:18px;max-width:min(48vw,560px);padding:10px 14px;border-radius:16px;background:linear-gradient(180deg,rgba(12,24,46,.94),rgba(10,16,30,.9));border:1px solid rgba(141,193,255,.18);color:#f0f5ff;font-size:13px;font-weight:700;line-height:1.4;font-family:"Times New Roman",Georgia,serif;box-shadow:0 16px 34px rgba(0,0,0,.28)}
.equation-banner .eq-small{display:block;margin-top:3px;font-size:11px;font-family:Inter,system-ui,sans-serif;color:#b9cffa;font-weight:600}
.equation-banner .eq-main{display:block}
.hud-strip{position:absolute;left:18px;right:18px;top:18px;display:flex;justify-content:center;gap:10px;pointer-events:none;transform:translateY(-92px);transition:.22s ease}
.hud-pill{padding:8px 12px;border-radius:999px;background:rgba(8,14,24,.72);border:1px solid rgba(132,172,235,.18);color:#dce8ff;font-size:11px;backdrop-filter:blur(10px)}
.stage:hover .hud-strip{transform:translateY(0)}
.formula-card{
min-height:120px;
border:1px solid rgba(142,198,255,.17);
border-radius:16px;
padding:12px;
background:linear-gradient(180deg,rgba(12,20,37,.95),rgba(8,13,24,.95));
font-size:13px;
line-height:1.6;
color:#e6f0ff;
}
.formula-card strong{display:block;margin-bottom:6px;color:#fff}
.formula-card .formula-line{font-family:"Times New Roman",Georgia,serif;font-size:18px;line-height:1.42;letter-spacing:.01em;color:#eef6ff;margin:10px 0}
.formula-card .eq-stack{display:flex;flex-direction:column;gap:8px}
.formula-card .eq-caption{font-size:11px;color:#a9c2ef;margin-top:-2px}
.pill-mini{font-size:11px;border-radius:999px;padding:7px 10px;background:rgba(255,255,255,.04);border:1px solid rgba(115,150,212,.16);color:#dce6fb}
.orbital-presets{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:10px}
.orbital-presets button{padding:10px 8px;font-size:12px;font-weight:700}
.view-switch{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:10px}
.view-switch button{padding:10px 8px;border-radius:14px;border:1px solid rgba(115,150,212,.16);background:linear-gradient(180deg,rgba(10,18,34,.98),rgba(7,11,20,.98));color:#e9f2ff;font-size:12px;font-weight:700;cursor:pointer;transition:.16s ease}
.view-switch button:hover{transform:translateY(-1px);border-color:rgba(149,212,255,.44)}
.view-switch button.active{border-color:rgba(255,188,96,.72);box-shadow:0 0 0 1px rgba(255,188,96,.18) inset,0 12px 24px rgba(0,0,0,.18);color:#fff4d5}
.orbital-atlas-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:12px}
.orbital-tile{
padding:6px;
border-radius:14px;
border:1px solid rgba(115,150,212,.16);
background:linear-gradient(180deg,rgba(10,18,34,.98),rgba(7,11,20,.98));
cursor:pointer;
transition:.16s ease;
}
.orbital-tile:hover{transform:translateY(-1px);border-color:rgba(149,212,255,.44)}
.orbital-tile.active{border-color:rgba(255,188,96,.72);box-shadow:0 0 0 1px rgba(255,188,96,.18) inset,0 12px 24px rgba(0,0,0,.18)}
.orbital-thumb{
display:block;
width:100%;
aspect-ratio:1/1;
border-radius:10px;
border:1px solid rgba(255,255,255,.10);
background:#020305;
}
.orbital-caption{
margin-top:5px;
font-size:10px;
line-height:1.25;
text-align:center;
color:#e9f2ff;
}
.orbital-caption small{
display:block;
margin-top:2px;
color:#9fb3d7;
font-size:10px;
}
.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:12px}
.stat-card{padding:10px 11px;border-radius:14px;background:rgba(120,150,210,.06);border:1px solid rgba(120,150,210,.15)}
.stat-card .label{font-size:11px;color:var(--muted)}
.stat-card .value{margin-top:4px;font-size:14px;font-weight:800;color:#eef6ff}
#radialGraph{display:block;width:100%;height:auto;margin-top:12px;border-radius:14px;border:1px solid rgba(131,174,239,.16);background:linear-gradient(180deg,#091221,#07101b)}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.step-badge{padding:9px 8px;border-radius:14px;background:linear-gradient(180deg,#0f1d34,#0a1425);border:1px solid rgba(115,150,212,.18);color:#dce6fb;font-weight:700;font-size:12px;text-align:center}
.step-badge.active{background:linear-gradient(180deg,rgba(113,78,214,.30),rgba(38,63,145,.20));border-color:rgba(150,205,255,.7);box-shadow:0 0 0 1px rgba(121,187,255,.14) inset, 0 10px 24px rgba(49,82,169,.20)}
.card-top{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px}
.muted{color:var(--muted)}
.section p,.note,.guide-text,.guide-callout,.guide-float-text,.formula-card{ text-align:justify; text-justify:inter-word; hyphens:auto; }

#hydrogenVisualizerHost{
position:absolute;
inset:0;
display:none;
z-index:5;
background:linear-gradient(180deg,rgba(7,16,27,.94),rgba(4,8,16,.98));
}
#hydrogenVisualizerHost.active{display:block}
#hydrogenVisualizerFrame{
width:100%;
height:100%;
border:0;
display:block;
background:transparent;
}
#hydrogenoidSection .embedded-viewer-caption{
margin-top:12px;
padding:11px 12px;
border-radius:14px;
border:1px solid rgba(125,211,252,.18);
background:rgba(125,211,252,.06);
color:#d5e5ff;
font-size:12px;
line-height:1.55;
}
#orbitalViewSwitch,
#orbitalPresets,
#orbitalAtlas,
#radialGraph{
display:none !important;
}

@media (max-width:1120px){
.app{grid-template-columns:1fr;grid-template-rows:minmax(56vh,1fr) auto;height:auto}
.view-wrap{height:58vh}
}
@media (max-width:640px){
.orbital-presets,.steps-grid,.orbital-atlas-grid{grid-template-columns:repeat(2,1fr)}
.grid3{grid-template-columns:1fr}
.grid2{grid-template-columns:1fr}
.guide-float{max-width:calc(100% - 36px)}
.equation-banner{left:18px;right:18px;top:auto;bottom:86px;font-size:12px}
}