/* Balancing Equations: dark navy stage + white side cards (same family as Atom Builder and Molecule Builder). Frame from /shared/style.css. */
.be-head{max-width:1080px;margin:0 auto;padding:4px 16px 0}
.be-head h1{margin:6px 0 4px;font-size:clamp(24px,6vw,34px)}
.be-head p{margin:0 0 10px;color:#4b5563;font-size:15px}
#be-wrap{position:relative;max-width:1080px;margin:0 auto;padding:0 8px;user-select:none;-webkit-user-select:none}
.be-bar{display:flex;align-items:center;gap:8px;padding:0 4px 8px}
.be-bar .sp{flex:1}
.be-bar button{height:40px;min-width:40px;padding:0 12px;border-radius:12px;border:0;background:#fff;box-shadow:0 1px 3px #0002;font:600 14px/1 system-ui,sans-serif;color:#1f2a3a;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.be-main{display:grid;grid-template-columns:minmax(0,1fr) 350px;gap:14px;align-items:start}
#be-stage{position:relative;border-radius:22px;background:radial-gradient(circle at 50% 40%,#2f3d63,#171d36 72%);box-shadow:0 6px 16px #0003;overflow:hidden;padding:12px 14px 10px;color:#fff}

/* the equation strip */
#be-strip{--k:1;display:flex;justify-content:center;align-items:center;gap:calc(8px * var(--k));font:800 calc(30px * var(--k))/1 system-ui,sans-serif;white-space:nowrap;padding:2px 0}
#be-strip.wrap{flex-wrap:wrap;row-gap:6px}
.be-br{display:none}
#be-strip.wrap .be-br{display:block;flex-basis:100%;height:0}
.be-term{display:inline-flex;align-items:center;gap:calc(5px * var(--k))}
.be-co{display:flex;flex-direction:column;align-items:center;gap:3px}
.be-co button{position:relative;width:calc(42px * var(--k));min-width:32px;height:calc(28px * var(--k));min-height:26px;border:0;border-radius:8px;background:#ffffff1f;color:#ffffffd0;font:700 14px/1 system-ui,sans-serif;cursor:pointer;padding:0;display:grid;place-items:center;touch-action:manipulation}
.be-co button:hover{background:#ffffff33}
.be-co button.glow{background:#ffd24a;color:#3a2a00;box-shadow:0 0 0 5px #ffd24a40;animation:bepulse 1.1s ease-in-out infinite alternate}
@keyframes bepulse{to{box-shadow:0 0 0 8px #ffd24a22}}
.be-n{width:calc(42px * var(--k));min-width:30px;height:calc(46px * var(--k));border-radius:10px;background:#ffffff14;border:2px solid #ffffff38;display:grid;place-items:center;font-size:calc(28px * var(--k));box-sizing:border-box;transition:opacity .5s,border-color .5s}
.be-n.one{color:#ffffff59}
#be-strip.bal .be-n{border-color:#34d39988}
#be-strip.bal .be-n.one{opacity:0}
.be-n.bump{animation:bebump .25s}
@keyframes bebump{40%{transform:scale(1.18)}}
.be-f{cursor:pointer;padding:6px 0}
.be-f sub{font-size:.62em;vertical-align:-.28em;line-height:0;border-bottom:2px dotted #ffffff70;padding:0 1px}
.be-f.shake{animation:beshake .45s}
.be-f.shake sub{color:#ffd24a;border-bottom-color:#ffd24a}
@keyframes beshake{15%,55%{transform:translateX(-5px)}35%,75%{transform:translateX(5px)}}
.be-op{color:#ffffffa0;font-size:.85em;padding:0 1px}
#be-hand{position:absolute;left:62%;top:30%;font-size:30px;filter:drop-shadow(0 2px 3px #0008);pointer-events:none;animation:betap 1s ease-in-out infinite;z-index:2}
@keyframes betap{50%{transform:translate(-4px,-6px) scale(.92)}}

/* boxes */
.be-boxes{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:10px}
.be-box{position:relative;border-radius:16px;background:#ffffff0d;border:2px dashed #ffffff2a}
.be-box h3{margin:0;position:absolute;top:8px;left:12px;font:700 12px system-ui,sans-serif;letter-spacing:.7px;text-transform:uppercase;color:#ffffff90}
.be-box svg{display:block;width:100%;height:auto}
.be-box .halo{opacity:0}
.be-box svg.lit .halo{animation:behalo 1.8s ease-out}
@keyframes behalo{15%,60%{opacity:.95}100%{opacity:0}}
.be-box .pop{animation:bepop .35s cubic-bezier(.3,1.6,.6,1)}
@keyframes bepop{from{transform:scale(0);opacity:0}}
.be-box .ghost{animation:beghost .3s forwards;pointer-events:none}
@keyframes beghost{to{transform:scale(.3);opacity:0}}

/* scales */
.be-count{margin-top:8px}
.be-count h3{margin:0 0 2px;text-align:center;font:700 12px system-ui,sans-serif;letter-spacing:.7px;text-transform:uppercase;color:#ffffff90}
#be-beams{--n:3;--np:3;display:grid;grid-template-columns:repeat(var(--n),minmax(0,150px));justify-content:center;gap:4px 14px}
.be-beam{background:#ffffff0a;border-radius:12px;padding:2px 6px 0}
.be-beam svg{display:block;width:100%;height:auto;overflow:visible}
.be-beam .arm,.be-beam .pan{transition:transform .45s cubic-bezier(.3,1.4,.5,1)}
.be-beam .arm line{stroke:#fbbf24}
.be-beam .pan path,.be-beam .pan line{stroke:#fbbf24}
.be-beam.ok .arm line,.be-beam.ok .pan path,.be-beam.ok .pan line{stroke:#34d399}
.be-beam.flash svg{animation:beflash .9s}
@keyframes beflash{30%{filter:drop-shadow(0 0 8px #34d399)}}

#be-banner{position:absolute;top:44%;left:50%;transform:translateX(-50%);background:#123a2ee8;box-shadow:0 0 0 2px #34d39999;color:#fff;font:800 20px system-ui,sans-serif;padding:8px 18px;border-radius:14px;pointer-events:none;text-align:center;max-width:86%;z-index:3}
#be-banner.soft{background:#3a3212e8;box-shadow:0 0 0 2px #fbbf2499;font-size:17px}
#be-banner.pop{animation:bebanner .5s}
@keyframes bebanner{30%{transform:translateX(-50%) scale(1.12)}}
.be-msg{position:absolute;left:12px;right:12px;top:130px;margin:0 auto;max-width:560px;padding:8px 14px;border-radius:14px;font:600 14px/1.35 system-ui,sans-serif;text-align:center;background:#5c4400f0;color:#fff;pointer-events:none;z-index:4}
#be-banner[hidden],.be-msg[hidden]{display:none}

/* side cards */
.be-left,.be-side{display:flex;flex-direction:column;gap:12px;min-width:0}
.be-card{background:#fff;border-radius:18px;box-shadow:0 1px 4px #0002;padding:14px 16px;color:#1f2a3a}
.be-top{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
#be-type{font:800 12px system-ui,sans-serif;text-transform:uppercase;letter-spacing:.6px;padding:4px 9px;border-radius:999px;background:#e0e7ff;color:#3730a3}
#be-type.t-synthesis{background:#dbeafe;color:#1e40af}#be-type.t-decomposition{background:#fce7f3;color:#9d174d}
#be-type.t-single{background:#ede9fe;color:#5b21b6}#be-type.t-double{background:#e0f2fe;color:#075985}
#be-type.t-combustion{background:#ffedd5;color:#9a3412}#be-type.t-redox{background:#fef3c7;color:#92400e}
#be-name{font:800 17px system-ui,sans-serif}
#be-typeline{font:13px/1.4 system-ui,sans-serif;color:#6b7280;margin-top:6px}
#be-eq{font:800 24px/1.25 system-ui,sans-serif;margin-top:10px}
#be-eq sub{font-size:.62em;vertical-align:-.25em;line-height:0}
#be-words{font:15px/1.4 system-ui,sans-serif;color:#4b5563;margin-top:4px}
#be-state{font:800 15px system-ui,sans-serif;color:#1d4ed8;margin-top:10px}
#be-state.ok{color:#0f8a4f}#be-state.soft{color:#a16207}
#be-off{font:14px/1.45 system-ui,sans-serif;color:#374151;margin-top:4px}
#be-off:empty{display:none}
#be-tally{width:100%;border-collapse:collapse;margin-top:10px;font:15px system-ui,sans-serif}
#be-tally td,#be-tally th{padding:4px 6px;text-align:center;border-bottom:1px solid #eef0f3}
#be-tally th{font-size:11px;color:#6b7280;text-transform:uppercase;letter-spacing:.5px;font-weight:700}
#be-tally td:first-child{font-weight:800}
#be-tally sub{font-size:.7em;vertical-align:-.2em;line-height:0}
#be-tally .ok{color:#0f8a4f;font-weight:800}
#be-tally .amb{color:#b45309;font-weight:800;white-space:nowrap}
#be-line{font:14px/1.45 system-ui,sans-serif;color:#4b5563;margin:10px 0 0}
.be-lab{font:700 12px system-ui,sans-serif;color:#6b7280;text-transform:uppercase;letter-spacing:.6px;display:flex;justify-content:space-between;margin-bottom:8px}
.be-lv{font:700 11px system-ui,sans-serif;color:#6b7280;margin:8px 0 4px}
.be-level:first-child .be-lv{margin-top:0}
@media (min-width:1180px){.be-left .be-row{grid-template-columns:repeat(8,minmax(0,1fr))}}
.be-row{display:grid;grid-template-columns:repeat(4,1fr);gap:4px}
.be-row button{border:0;border-radius:8px;background:#eef0f3;color:#4b5563;font:700 12px/1.1 system-ui,sans-serif;height:34px;padding:0 3px;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;touch-action:manipulation}
.be-row button{position:relative}
.be-row button.got{background:#dcfce7;color:#15803d}
.be-row button.got::after{content:'✓';position:absolute;top:1px;right:4px;font-size:10px;line-height:1.2}
.be-row button.now.got::after{color:#bbf7d0}
.be-row button.next{box-shadow:inset 0 0 0 2px #f5b800;background:#fffbea}
.be-row button.now{background:#1d4ed8;color:#fff;box-shadow:none}
.be-pack{display:flex;flex-direction:column;gap:8px}
.be-pack a{display:flex;gap:12px;align-items:center;background:#fff;border-radius:16px;box-shadow:0 1px 4px #0002;padding:12px 14px;text-decoration:none;color:#1f2a3a}
.be-pack img{flex:0 0 auto;width:52px;height:auto;border-radius:6px;box-shadow:0 1px 4px #0003}
.be-pack .tag{display:block;font:700 12px system-ui,sans-serif;color:#6b7280;text-transform:uppercase;letter-spacing:.5px}
.be-pack b{display:block;color:#0f6b4f;font-size:15px;margin:2px 0;line-height:1.3}
.be-pack .ln{display:block;font-size:13px;color:#4b5563;line-height:1.4}
.be-info{max-width:820px;margin:26px auto 0;padding:0 16px 30px}
.be-info h2{font-size:22px;margin:26px 0 8px}.be-info h3{font-size:17px;margin:18px 0 4px}
.be-info p,.be-info li{font-size:16px;line-height:1.6;color:#374151}
.be-info ul{margin:0;padding-left:22px}
.be-info li{margin:4px 0;padding-left:2px}
@media (max-width:820px){.be-main{grid-template-columns:1fr}#be-eq{display:none}}
@media (max-width:600px){
  #be-stage{padding:10px 8px 8px;border-radius:18px}
  .be-boxes{gap:6px}
  .be-box h3{font-size:10px;top:5px;left:8px;letter-spacing:.4px}
  #be-beams{grid-template-columns:repeat(var(--np),minmax(0,130px));gap:2px 10px}
  #be-banner{font-size:16px;padding:7px 14px}
  #be-banner.soft{font-size:14px}
  .be-msg{font-size:13px}
}