/* ============================================================
   The Two Machines — UI chrome
   Dark studio register: near-black stage, hairlines, two accents.
   ============================================================ */

:root{
  --bg:#0b0d10;
  --panel:rgba(15,18,23,.78);
  --panel-solid:#101318;
  --line:rgba(255,255,255,.09);
  --line-strong:rgba(255,255,255,.16);
  --txt:#e8ebf0;
  --txt-dim:#9aa3ad;
  --txt-faint:#6b7480;
  --ev:#46e2ff;
  --ev-dim:rgba(70,226,255,.14);
  --ice:#ff9350;
  --ice-dim:rgba(255,147,80,.14);
  --ease:cubic-bezier(.22,1,.36,1);
  --rail-w:264px;
  --panel-w:400px;
  --top-h:64px;
}

*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:'InterVar',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:14px;line-height:1.55;
  overflow:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
button:focus-visible,[tabindex]:focus-visible{outline:1.5px solid var(--ev);outline-offset:2px;border-radius:6px}

/* ---------------- stage & atmosphere ---------------- */
#stage{position:fixed;inset:0;cursor:grab}
#stage.dragging{cursor:grabbing}
#stage.hovering{cursor:pointer}
#stage canvas{display:block}

#vignette{
  position:fixed;inset:0;pointer-events:none;z-index:2;
  background:radial-gradient(ellipse 120% 90% at 50% 42%,transparent 55%,rgba(4,5,7,.55) 100%);
}
#grain{
  position:fixed;inset:-100px;pointer-events:none;z-index:3;opacity:.05;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
  animation:grain 7s steps(6) infinite;
}
@keyframes grain{
  0%,100%{transform:translate(0,0)}20%{transform:translate(-40px,30px)}
  40%{transform:translate(30px,-50px)}60%{transform:translate(-60px,-20px)}80%{transform:translate(40px,40px)}
}
@media (prefers-reduced-motion:reduce){#grain{animation:none}}

/* split divider */
#splitDivider{
  position:fixed;inset:0;pointer-events:none;z-index:2;opacity:0;transition:opacity .5s var(--ease);
}
#splitDivider.on{opacity:1}
#splitDivider::before{
  content:"";position:absolute;left:50%;top:0;bottom:0;width:1px;
  background:linear-gradient(180deg,transparent,rgba(255,255,255,.22) 18%,rgba(255,255,255,.22) 82%,transparent);
}
#splitDivider .side-label{
  position:absolute;top:calc(var(--top-h) + 18px);font-size:10px;letter-spacing:.34em;
  color:var(--txt-faint);text-transform:uppercase;padding-left:.34em;white-space:nowrap;
}
#splitDivider .side-label.left{left:calc(50% - 190px);color:rgba(70,226,255,.75)}
#splitDivider .side-label.right{right:calc(50% - 210px);color:rgba(255,147,80,.75)}

/* ---------------- 3D labels ---------------- */
#labels,#labelLines{position:fixed;inset:0;pointer-events:none;z-index:4}
#labelLines{width:100%;height:100%}
.lbl{
  position:absolute;transform:translate(-50%,-100%);
  font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--txt-dim);
  background:rgba(11,13,16,.72);border:1px solid var(--line);border-radius:20px;
  padding:3px 10px 3px 8px;white-space:nowrap;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  opacity:0;transition:opacity .25s var(--ease),border-color .25s,color .25s;
  display:flex;align-items:center;gap:6px;
}
.lbl::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--txt-faint);flex:none;transition:background .25s}
.lbl.show{opacity:1}
.lbl.ev::before{background:var(--ev)}
.lbl.ice::before{background:var(--ice)}
.lbl.hover,.lbl.sel{color:var(--txt);border-color:var(--line-strong);background:rgba(15,18,23,.9)}
.lbl.sel{border-color:rgba(70,226,255,.5)}
.lbl.sel.ice{border-color:rgba(255,147,80,.5)}
.lbl.ghost{opacity:.45}

/* ---------------- top bar ---------------- */
#topbar{
  position:fixed;top:0;left:0;right:0;height:var(--top-h);z-index:10;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 22px;gap:16px;
  background:linear-gradient(180deg,rgba(7,8,10,.82),transparent);
  pointer-events:none;
}
#topbar>*{pointer-events:auto}
#brand{display:flex;align-items:center;gap:13px;min-width:0}
#brand .mark{position:relative;width:30px;height:30px;flex:none}
#brand .ring{position:absolute;inset:0;border:1.5px solid rgba(70,226,255,.85);border-radius:50%;animation:spin 14s linear infinite}
#brand .dot{position:absolute;left:50%;top:50%;width:8px;height:8px;margin:-4px;border-radius:50%;background:var(--ice)}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){#brand .ring{animation:none}}
#brand h1{font-size:15.5px;font-weight:640;letter-spacing:.035em;white-space:nowrap}
#brand p{font-size:10.5px;color:var(--txt-faint);letter-spacing:.14em;text-transform:uppercase;margin-top:1px;white-space:nowrap}
#brand p .vs{color:var(--txt-dim)}

#controls{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.ctl{
  display:flex;align-items:center;gap:7px;
  border:1px solid var(--line);border-radius:9px;
  background:var(--panel);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  color:var(--txt-dim);padding:7px 12px;
  font-size:11.5px;font-weight:560;letter-spacing:.04em;
  transition:color .2s,border-color .2s,background .2s;
  position:relative;
}
.ctl svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.ctl:hover{color:var(--txt);border-color:var(--line-strong)}
.ctl[aria-pressed="true"]{color:#fff;border-color:rgba(70,226,255,.45);background:rgba(70,226,255,.10)}
.ctl[data-tip]::after{
  content:attr(data-tip);position:absolute;top:calc(100% + 8px);right:0;
  background:var(--panel-solid);border:1px solid var(--line);border-radius:7px;
  color:var(--txt-dim);font-size:10.5px;letter-spacing:.03em;padding:5px 9px;white-space:nowrap;
  opacity:0;transform:translateY(-3px);transition:.18s var(--ease);pointer-events:none;z-index:20;
}
.ctl[data-tip]:hover::after{opacity:1;transform:none}
@media (max-width:980px){.ctl span{display:none}.ctl{padding:8px 10px}.ctl[data-tip]::after{display:none}}

/* ---------------- left rail ---------------- */
#rail{
  position:fixed;left:18px;top:calc(var(--top-h) + 14px);bottom:96px;width:var(--rail-w);
  z-index:9;display:flex;flex-direction:column;
  background:var(--panel);border:1px solid var(--line);border-radius:14px;
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  overflow:hidden;
  transition:transform .38s var(--ease),opacity .38s var(--ease);
}
#rail.hidden{transform:translateX(calc(-100% - 26px));opacity:0;pointer-events:none}
.rail-tabs{display:flex;gap:4px;padding:8px;border-bottom:1px solid var(--line);flex:none}
.rail-tabs button{
  flex:1;padding:7px 4px;border-radius:8px;font-size:11px;font-weight:620;letter-spacing:.09em;
  text-transform:uppercase;color:var(--txt-faint);transition:.2s;
}
.rail-tabs button:hover{color:var(--txt-dim)}
#tabEV[aria-selected="true"]{color:var(--ev);background:var(--ev-dim)}
#tabICE[aria-selected="true"]{color:var(--ice);background:var(--ice-dim)}
#tabPairs[aria-selected="true"]{color:#fff;background:linear-gradient(90deg,var(--ev-dim),var(--ice-dim))}
#railBody{overflow-y:auto;overscroll-behavior:contain;padding:10px 8px 14px;flex:1;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.14) transparent}
#railBody::-webkit-scrollbar{width:8px}
#railBody::-webkit-scrollbar-thumb{background:rgba(255,255,255,.12);border-radius:4px;border:2px solid transparent;background-clip:content-box}

.grp{margin-top:10px}
.grp:first-child{margin-top:2px}
.grp-h{
  display:flex;align-items:center;gap:8px;width:100%;text-align:left;
  padding:6px 8px 5px;font-size:10px;letter-spacing:.22em;text-transform:uppercase;color:var(--txt-faint);
}
.grp-h .chev{width:9px;height:9px;fill:none;stroke:currentColor;stroke-width:1.8;transition:transform .25s var(--ease);flex:none}
.grp.open .grp-h .chev{transform:rotate(90deg)}
.grp-h:hover{color:var(--txt-dim)}
.grp-h .cnt{margin-left:auto;font-size:9.5px;letter-spacing:.1em;color:var(--txt-faint);opacity:.7}
.grp-list{display:none;padding:1px 0 3px}
.grp.open .grp-list{display:block}
.it{
  display:flex;align-items:center;gap:9px;width:100%;text-align:left;
  padding:6px 9px;border-radius:8px;font-size:12.5px;color:var(--txt-dim);
  transition:background .16s,color .16s;
}
.it:hover{background:rgba(255,255,255,.055);color:var(--txt)}
.it.sel{background:rgba(70,226,255,.13);color:#fff}
.it.sel.ice{background:rgba(255,147,80,.14);color:#fff}
.it .sw{width:6px;height:6px;border-radius:2px;background:var(--txt-faint);flex:none;transition:.16s}
.it:hover .sw{background:var(--txt-dim)}
.it[data-side="ev"] .sw{border-radius:50%}
.it.sel[data-side="ev"] .sw{background:var(--ev)}
.it.sel[data-side="ice"] .sw{background:var(--ice)}
.it .arrow{margin-left:auto;opacity:0;font-size:10px;transition:opacity .16s;color:var(--txt-faint)}
.it:hover .arrow{opacity:1}
.it.pair-item .nm b{font-weight:560}
.it.pair-item .nm{font-size:12px}
.pair-dot{display:inline-flex;width:34px;height:6px;border-radius:3px;flex:none;background:linear-gradient(90deg,var(--ev) 0 50%,var(--ice) 50% 100%)}

#railToggle{
  position:fixed;left:18px;top:calc(var(--top-h) + 14px);z-index:8;width:38px;height:38px;
  border:1px solid var(--line);border-radius:10px;background:var(--panel);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);color:var(--txt-dim);
  display:none;align-items:center;justify-content:center;
}
#railToggle svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
#railToggle:hover{color:var(--txt)}
body.rail-collapsed #railToggle{display:flex}

/* ---------------- right detail panel ---------------- */
#panel{
  position:fixed;right:18px;top:calc(var(--top-h) + 14px);bottom:96px;width:min(var(--panel-w),calc(100vw - 36px));
  z-index:11;background:var(--panel);border:1px solid var(--line);border-radius:14px;
  backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  transform:translateX(calc(100% + 26px));opacity:0;
  transition:transform .42s var(--ease),opacity .42s var(--ease);
  display:flex;flex-direction:column;overflow:hidden;
}
#panel.open{transform:none;opacity:1}
#panelClose{
  position:absolute;top:10px;right:10px;z-index:2;width:30px;height:30px;border-radius:8px;
  color:var(--txt-faint);display:flex;align-items:center;justify-content:center;background:rgba(11,13,16,.5);
}
#panelClose:hover{color:var(--txt);background:rgba(255,255,255,.08)}
#panelClose svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
#panelScroll{overflow-y:auto;padding:22px 22px 26px;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.14) transparent}
#panelScroll::-webkit-scrollbar{width:8px}
#panelScroll::-webkit-scrollbar-thumb{background:rgba(255,255,255,.12);border-radius:4px;border:2px solid transparent;background-clip:content-box}

.pc-kicker{display:flex;align-items:center;gap:8px;font-size:10px;letter-spacing:.24em;text-transform:uppercase;color:var(--txt-faint);margin-bottom:9px}
.pc-kicker .side-chip{padding:2.5px 9px;border-radius:20px;font-weight:640;letter-spacing:.18em}
.pc-kicker .side-chip.ev{color:var(--ev);background:var(--ev-dim)}
.pc-kicker .side-chip.ice{color:var(--ice);background:var(--ice-dim)}
.pc-kicker .side-chip.pair{color:#fff;background:linear-gradient(90deg,var(--ev-dim),var(--ice-dim))}
#panel h2{font-size:22px;font-weight:640;letter-spacing:.012em;line-height:1.2;margin-bottom:4px}
.pc-lede{color:var(--txt-dim);font-size:13px;margin:2px 0 14px}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:16px}
.chip{
  border:1px solid var(--line);border-radius:7px;padding:4px 9px;font-size:11px;color:var(--txt-dim);
  background:rgba(255,255,255,.025);
}
.chip b{color:var(--txt);font-weight:600;margin-right:5px;font-variant-numeric:tabular-nums}
.pc-body p{color:#c6ccd4;font-size:13.5px;margin:0 0 12px}
.pc-body p:last-child{margin-bottom:0}
.pc-why{
  margin-top:16px;padding:13px 15px;border-radius:11px;border:1px solid var(--line);
  background:rgba(255,255,255,.028);font-size:12.5px;color:var(--txt-dim);
}
.pc-why b{display:block;font-size:9.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--txt-faint);margin-bottom:6px;font-weight:640}

.pc-link{
  margin-top:18px;width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;
  border:1px solid var(--line);border-radius:11px;padding:12px 14px;text-align:left;
  color:var(--txt-dim);font-size:12.5px;transition:.2s;
}
.pc-link:hover{border-color:var(--line-strong);color:var(--txt);background:rgba(255,255,255,.03)}
.pc-link .t{display:flex;flex-direction:column;gap:2px}
.pc-link .t b{font-size:13px;color:var(--txt);font-weight:580}
.pc-link .t span{font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--txt-faint)}
.pc-link .arr{font-size:16px;color:var(--txt-faint)}

/* pair view */
.pair-cols{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:4px}
.pair-col{border:1px solid var(--line);border-radius:11px;padding:12px 13px;background:rgba(255,255,255,.02)}
.pair-col.ev{border-color:rgba(70,226,255,.22)}
.pair-col.ice{border-color:rgba(255,147,80,.22)}
.pair-col h4{font-size:10px;letter-spacing:.2em;text-transform:uppercase;margin-bottom:7px;font-weight:640}
.pair-col.ev h4{color:var(--ev)}
.pair-col.ice h4{color:var(--ice)}
.pair-col p{font-size:12px;color:#c0c7cf}
.pair-rows{margin-top:14px;border-top:1px solid var(--line)}
.pair-row{display:grid;grid-template-columns:86px 1fr 1fr;gap:8px;padding:9px 2px;border-bottom:1px solid var(--line);font-size:12px}
.pair-row .lbl-c{color:var(--txt-faint);font-size:10px;letter-spacing:.12em;text-transform:uppercase;padding-top:2px}
.pair-row .v-ev{color:#c9ecf5}
.pair-row .v-ice{color:#f3ddcd}
.pair-jump{display:flex;gap:8px;margin-top:16px}
.pair-jump button{
  flex:1;border:1px solid var(--line);border-radius:10px;padding:9px;font-size:11.5px;letter-spacing:.06em;color:var(--txt-dim);transition:.2s;
}
.pair-jump button:hover{color:var(--txt);border-color:var(--line-strong);background:rgba(255,255,255,.03)}
.pair-jump .b-ev:hover{border-color:rgba(70,226,255,.4)}
.pair-jump .b-ice:hover{border-color:rgba(255,147,80,.4)}

/* ---------------- bottom dock ---------------- */
#dock{
  position:fixed;left:50%;bottom:20px;transform:translateX(-50%);z-index:9;
  display:flex;flex-direction:column;align-items:center;gap:9px;
}
#layers{
  display:flex;align-items:center;gap:3px;padding:5px;max-width:calc(100vw - 20px);
  background:var(--panel);border:1px solid var(--line);border-radius:12px;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
}
#layers button{
  display:flex;align-items:center;gap:7px;padding:7px 13px;border-radius:8px;
  font-size:11px;font-weight:560;letter-spacing:.07em;color:var(--txt-faint);transition:.2s;position:relative;
}
#layers button .tick{width:5px;height:5px;border-radius:50%;background:var(--txt-faint);opacity:.5;transition:.2s}
#layers button:hover{color:var(--txt-dim)}
#layers button.on{color:#fff;background:rgba(255,255,255,.07)}
#layers button.on .tick{background:var(--ev);opacity:1;box-shadow:0 0 8px rgba(70,226,255,.8)}
#layers .sep{width:1px;height:16px;background:var(--line);margin:0 3px}
#hint{
  font-size:10.5px;letter-spacing:.1em;color:var(--txt-faint);text-transform:uppercase;
  opacity:.85;transition:opacity 1.2s;text-align:center;padding:0 12px;
}
#hint.fade{opacity:0}
@media (max-width:760px){
  #layers{padding:4px;gap:0}
  #layers button{padding:6px 6px}
  #layers button .nm{font-size:9.5px;letter-spacing:.03em}
  #dock{bottom:10px}
  #hint{display:none}
}

/* ---------------- energy hud ---------------- */
#energyHud{
  position:fixed;right:18px;bottom:20px;z-index:9;width:230px;
  background:var(--panel);border:1px solid var(--line);border-radius:12px;
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  padding:11px 12px 12px;transform:translateY(120%);opacity:0;transition:.45s var(--ease);
}
#energyHud.on{transform:none;opacity:1}
.eh-title{font-size:9.5px;letter-spacing:.28em;text-transform:uppercase;color:var(--txt-faint);margin-bottom:9px}
.eh-row{display:flex;align-items:center;gap:9px}
.eh-row + .eh-row{margin-top:7px}
.eh-side{font-size:10px;font-weight:700;letter-spacing:.12em;width:26px;flex:none}
.eh-row.ev .eh-side{color:var(--ev)}
.eh-row.ice .eh-side{color:var(--ice)}
.eh-seg{display:flex;flex:1;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.eh-seg button{
  flex:1;padding:5.5px 4px;font-size:10.5px;letter-spacing:.04em;color:var(--txt-faint);transition:.18s;
}
.eh-seg button + button{border-left:1px solid var(--line)}
.eh-seg button:hover{color:var(--txt-dim)}
.eh-seg button.on{color:#fff;background:rgba(70,226,255,.14)}
.eh-row.ice .eh-seg button.on{background:rgba(255,147,80,.14)}
@media (max-width:980px){#energyHud{right:12px;bottom:12px;width:200px}}

/* ---------------- toast ---------------- */
#toast{
  position:fixed;left:50%;top:calc(var(--top-h) + 16px);transform:translate(-50%,-12px);z-index:30;
  background:var(--panel-solid);border:1px solid var(--line-strong);border-radius:10px;
  padding:9px 16px;font-size:12px;color:var(--txt-dim);opacity:0;pointer-events:none;
  transition:.35s var(--ease);letter-spacing:.02em;max-width:min(80vw,480px);text-align:center;
}
#toast.on{opacity:1;transform:translate(-50%,0)}

/* ---------------- loader ---------------- */
#loader{
  position:fixed;inset:0;z-index:50;background:var(--bg);
  display:grid;place-items:center;transition:opacity .9s var(--ease);
}
#loader.done{opacity:0;pointer-events:none}
.l-inner{display:flex;flex-direction:column;align-items:center;gap:0}
.l-mark{position:relative;width:44px;height:44px;margin-bottom:22px}
.l-mark .ring{position:absolute;inset:0;border:1.5px solid rgba(70,226,255,.8);border-radius:50%;border-top-color:transparent;animation:spin 1.15s linear infinite}
.l-mark .dot{position:absolute;left:50%;top:50%;width:9px;height:9px;margin:-4.5px;border-radius:50%;background:var(--ice)}
.l-title{font-size:19px;font-weight:640;letter-spacing:.05em}
.l-sub{font-size:10px;letter-spacing:.34em;text-transform:uppercase;color:var(--txt-faint);margin:7px 0 26px}
.l-bar{width:190px;height:1.5px;background:rgba(255,255,255,.1);border-radius:2px;overflow:hidden}
.l-bar i{display:block;height:100%;width:0%;background:linear-gradient(90deg,var(--ev),#9ef);transition:width .3s var(--ease)}

/* ---------------- fallback ---------------- */
#fallback{position:fixed;inset:0;z-index:40;background:rgba(9,10,13,.94);display:grid;place-items:center;padding:24px}
#fallback[hidden]{display:none}
.fb-inner{max-width:560px;border:1px solid var(--line);border-radius:16px;padding:34px 38px;background:var(--panel)}
.fb-inner h2{font-size:19px;font-weight:640;margin-bottom:10px}
.fb-inner p{font-size:13px;color:var(--txt-dim)}

/* ---------------- responsive ---------------- */
@media (max-width:1180px){:root{--panel-w:360px}}
@media (max-width:980px){
  :root{--top-h:56px;--rail-w:250px}
  #brand p{display:none}
  #dock{bottom:14px}
  #panel{top:auto;bottom:0;right:0;left:0;width:100%;max-height:58vh;border-radius:16px 16px 0 0;border-bottom:0;
    transform:translateY(110%)}
  #panel.open{transform:none}
  #rail{bottom:0;left:0;top:auto;width:100%;max-height:52vh;border-radius:16px 16px 0 0;border-bottom:0;
    transform:translateY(110%)}
  #rail.hidden{transform:translateY(110%)}
  body:not(.rail-collapsed) #railToggle{display:flex;position:fixed;left:14px;top:calc(var(--top-h) + 10px);bottom:auto}
  #railBody{max-height:calc(52vh - 54px)}
  #railToggle{top:calc(var(--top-h) + 10px)}
  #splitDivider .side-label{display:none}
}
@media (max-width:560px){
  #brand h1{font-size:13px}
  .ctl{padding:7px 9px}
  #layers button{padding:6px 8px}
}