/* Explorer app layout: three panels on desktop, full-bleed stage + bottom sheets on phones */
.xp-page main{padding:0}
.xp{display:grid;grid-template-columns:316px minmax(0,1fr) 372px;gap:12px;padding:12px;height:calc(100dvh - var(--header-h));min-height:620px}
.xp-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:var(--navy-400) transparent}
.xp-panel-inner{padding:20px}
.xp h1{font-size:28px;margin:0 0 10px}
.xp h2{font-size:21px;margin:0 0 10px}
.xp h3{font-size:17px;margin:0 0 8px;font-family:var(--font);font-weight:650;letter-spacing:0}
.xp .eyebrow{font-size:13.5px;margin-bottom:8px}
.xp-block{padding:18px 0;border-top:1px solid var(--line)}
.xp-block:first-of-type{border-top:0;padding-top:0}
.pill{display:inline-flex;align-items:center;gap:6px;font:500 14px var(--font);color:var(--teal-text);border:1px solid rgba(var(--accent-rgb),.45);border-radius:999px;padding:5px 11px;background:rgba(0,91,213,.12)}
.pill.plain{color:var(--muted);border-color:var(--line-strong);background:transparent}

/* search */
.search{position:relative;margin-top:10px}
.search .ico{position:absolute;left:14px;top:50%;transform:translateY(-50%);width:20px;height:20px;color:var(--muted);pointer-events:none}
.search input{padding-left:44px;font-size:17px;border:1px solid var(--line-strong);background:rgba(0,0,0,.28)}
.search input:focus{border-color:transparent}
.results{list-style:none;margin:8px 0 0;padding:6px;border:1px solid var(--line-strong);border-radius:12px;background:var(--surface-solid);max-height:340px;overflow:auto}
.results[hidden]{display:none}
.results li{display:flex;align-items:center;gap:10px;min-height:44px;padding:8px 10px;border-radius:9px;cursor:pointer;font-size:15.5px}
.results li[aria-selected=true],.results li:hover{background:rgba(var(--accent-rgb),.14)}
.results li .k{margin-left:auto;font:500 12px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);white-space:nowrap}
.results li .dot{width:9px;height:9px;border-radius:50%;flex:none}
.results .empty{color:var(--muted);cursor:default}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chips .chip{min-height:44px;font-size:15px;padding:8px 13px}
.chip[aria-pressed=true]{background:var(--teal-btn);border-color:var(--teal-btn);color:#fff}

/* systems list */
.systems{list-style:none;padding:0;margin:8px 0 0}
.systems li{margin:0}
.sys{display:flex;align-items:center;gap:12px;width:100%;min-height:46px;padding:8px 10px;border-radius:10px;border:1px solid transparent;background:none;color:var(--text);font:500 15.5px var(--font);cursor:pointer;text-align:left}
.sys:hover{background:rgba(255,255,255,.04)}
.sys[aria-pressed=true]{background:rgba(0,91,213,.14);border-color:rgba(var(--accent-rgb),.35)}
.sys .sw{width:12px;height:12px;border-radius:50%;flex:none;box-shadow:0 0 0 2px rgba(255,255,255,.08)}
.sys .n{margin-left:auto;font:500 13.5px var(--mono);color:var(--muted)}
.sys .st{font:500 12px var(--mono);color:var(--gold-text)}
.seg{display:grid;grid-template-columns:1fr 1fr;gap:6px;border:1px solid var(--line-strong);border-radius:12px;padding:4px;background:rgba(0,0,0,.18)}
.seg button{min-height:42px;border-radius:9px;border:0;background:transparent;color:var(--muted);font:600 15px var(--font);cursor:pointer}
.seg button[aria-pressed=true]{background:var(--teal-btn);color:#fff}
.range-row{display:flex;align-items:center;gap:10px}
.range-row output{font:500 14px var(--mono);color:var(--teal-text);min-width:44px;text-align:right}
.toggle{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:46px;font-size:15.5px;cursor:pointer}
.toggle input{width:22px;height:22px;accent-color:var(--teal)}
.notice{font-size:15px;color:var(--text);line-height:1.55}
.link-list{list-style:none;padding:0;margin:10px 0 0}
.link-list li{margin:0}
.link-list a{display:flex;align-items:center;min-height:44px;font-size:15.5px}

/* stage */
.xp-stage{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);
  background:var(--ha-midnight)}

.xp-stage canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;outline:none}
.xp-stage canvas:focus-visible{outline:3px solid var(--cyan);outline-offset:-3px}
.stage-grid{position:absolute;inset:0;pointer-events:none;opacity:.12;background-image:linear-gradient(rgba(140,200,220,.25) 1px,transparent 1px),linear-gradient(90deg,rgba(140,200,220,.25) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(60% 55% at 50% 45%,#000,transparent)}
.stage-top{position:absolute;left:14px;right:14px;top:14px;display:flex;align-items:flex-start;gap:10px;z-index:3;pointer-events:none}
.stage-top>*{pointer-events:auto}
.modes{display:flex;gap:4px;padding:4px;border-radius:13px;background:var(--ha-navy);border:1px solid var(--line)}
.modes button{min-height:40px;padding:6px 12px;border-radius:9px;border:0;background:none;color:var(--muted);font:600 14.5px var(--font);cursor:pointer;white-space:nowrap}
.modes button[aria-pressed=true]{background:var(--teal-btn);color:#fff}
.stage-right{margin-left:auto;display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.glass{background:var(--ha-navy);border:1px solid var(--line);border-radius:12px}
.counter{font:500 13.5px var(--mono);color:var(--text);padding:9px 12px;white-space:nowrap}
.views select{min-height:42px;width:auto;padding:6px 34px 6px 12px;border-radius:12px;background:var(--ha-navy) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23b4c4d0' stroke-width='1.6' fill='none'/%3E%3C/svg%3E") no-repeat right 12px center;appearance:none;font-size:15px;border:1px solid var(--line)}
.crumb{position:absolute;left:14px;top:68px;z-index:3;font-size:14.5px;color:var(--muted);padding:6px 12px;max-width:min(70%,560px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.crumb:empty{display:none}
/* reference body switch + compare (WRD #3) */
#stage-canvas{position:absolute;inset:0}
#stage-canvas-2{position:absolute;top:0;bottom:0;left:50%;right:0;border-left:1px solid var(--line-strong)}
#stage-canvas-2[hidden]{display:none}
.xp-stage.compare #stage-canvas{right:50%}
.body-switch{display:flex;gap:4px;padding:4px;border-radius:13px;background:var(--ha-navy);border:1px solid var(--line)}
.body-switch button{min-height:40px;min-width:44px;padding:6px 12px;border-radius:9px;border:0;background:none;color:var(--muted);font:600 14.5px var(--font);cursor:pointer;white-space:nowrap}
.body-switch button[aria-pressed=true]{background:var(--teal-btn);color:#fff}
.body-switch .cmp{border-left:1px solid var(--line);border-radius:0 9px 9px 0;margin-left:2px}
.body-switch .cmp[aria-pressed=true]{background:#004BB5}
.body-note{position:absolute;left:14px;top:auto;bottom:108px;z-index:3;max-width:380px;margin:0;padding:10px 12px;font-size:13.5px;line-height:1.45;color:var(--muted)}
.body-note b{color:var(--gold-text)}
.body-note summary{cursor:pointer;min-height:24px;list-style-position:inside}
.body-note p{margin:8px 0 0}
.body-note[hidden]{display:none}
.compare-labels{position:absolute;inset:auto 0 auto 0;top:118px;z-index:2;pointer-events:none}
.compare-labels[hidden]{display:none}
.compare-labels span{position:absolute;top:0;padding:4px 10px;font:600 13px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:#fff}
#cmp-a{left:14px}#cmp-b{left:calc(50% + 14px)}
.cmp-miss{left:calc(50% + 14px);top:34px !important;font:500 13px var(--font) !important;text-transform:none !important;letter-spacing:0 !important;color:var(--gold-text) !important;max-width:calc(50% - 90px)}
.cmp-miss[hidden]{display:none}
.soon-list{margin:0;padding-left:18px;color:var(--muted)}
.src-note{margin:6px 0 0}
.xp-stage.compare .hotspots{display:none}
.crumb b{color:#fff;font-weight:600}
.toolbar{position:absolute;right:14px;top:50%;transform:translateY(-50%);z-index:3;display:flex;flex-direction:column;gap:4px;padding:6px}
.toolbar button{width:46px;height:46px;border-radius:10px;border:0;background:transparent;color:var(--text);display:grid;place-items:center;cursor:pointer;position:relative}
.toolbar button:hover,.toolbar button[aria-pressed=true]{background:rgba(var(--accent-rgb),.16);color:#fff}
.toolbar button svg{width:21px;height:21px}
.toolbar .sep{height:1px;background:var(--line);margin:4px 6px}
.tip{position:absolute;right:56px;top:50%;transform:translateY(-50%);background:#02121c;border:1px solid var(--line-strong);color:#fff;font:500 14px var(--font);padding:6px 10px;border-radius:8px;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity var(--t-fast)}
.toolbar button:hover .tip,.toolbar button:focus-visible .tip{opacity:1}
.popover{position:absolute;right:76px;top:50%;transform:translateY(-50%);z-index:4;width:280px;padding:16px}
.popover[hidden]{display:none}
.stage-bottom{position:absolute;left:14px;right:14px;bottom:14px;z-index:3;display:flex;gap:10px;align-items:flex-end;pointer-events:none}
.stage-bottom>*{pointer-events:auto}
.timeline{flex:1;max-width:720px;margin-inline:auto;padding:8px 16px 6px}
.timeline .row1{display:flex;align-items:center;gap:14px}
.timeline .age-track{flex:1;min-width:120px}
.timeline .age-track input{display:block;margin:0}
.timeline .habits{min-height:40px;font-weight:500;font-size:14.5px;white-space:nowrap}
.timeline label{font:600 15px var(--font);color:#fff;display:flex;align-items:center;gap:8px}
.timeline .age{font:600 22px var(--display);color:#fff;min-width:64px}
.timeline .ticks{display:flex;justify-content:space-between;font:500 12.5px var(--mono);color:var(--muted);margin-top:2px;padding:0 4px}
.timeline .illus{font-size:13px;color:var(--gold-text);margin:0;text-align:center}
.seg.small button{min-height:36px;font-size:13.5px;padding:0 10px}
.section-ctl{padding:10px 14px;width:280px}
.section-ctl[hidden]{display:none}
.hover-label{position:absolute;z-index:5;pointer-events:none;background:var(--ha-midnight);border:1px solid rgba(28,175,242,.6);color:#fff;font:500 14.5px var(--font);padding:6px 10px;border-radius:8px;transform:translate(14px,-130%);white-space:nowrap;display:none}
.hotspots{position:absolute;inset:0;z-index:2;pointer-events:none}
.hs{position:absolute;transform:translate(-50%,-50%);pointer-events:auto;width:40px;height:40px;border-radius:50%;border:2px solid #fff;background:var(--ha-atlas);overflow:visible;color:#fff;font:600 14px var(--mono);display:grid;place-items:center;cursor:pointer;box-shadow:0 0 0 6px rgba(1,152,251,.3),0 6px 18px rgba(0,0,0,.4);transition:transform var(--t-fast)}
.hs:not(.ring)::after{content:"";position:absolute;left:calc(100% + 2px);top:50%;width:26px;height:2px;background:rgba(255,255,255,.6);pointer-events:none}
.hs:not(.ring)::before{content:"";position:absolute;left:calc(100% + 26px);top:calc(50% - 3px);width:7px;height:7px;border-radius:50%;background:#fff;box-shadow:0 0 0 3px rgba(255,255,255,.25)}
.hs:hover,.hs:focus-visible{transform:translate(-50%,-50%) scale(1.1)}
.hs.active{background:var(--teal-btn);box-shadow:0 0 0 6px rgba(var(--accent-rgb),.3)}
.hs.ring{background:rgba(242,181,68,.15);border-color:#f2b544;color:#ffe0a0;width:auto;min-width:40px;height:auto;padding:4px 10px;border-radius:999px;font:600 12.5px var(--font)}
.loader{position:absolute;inset:0;z-index:6;display:grid;place-items:center;background:rgba(3,24,48,.94);transition:opacity .5s}
.loader.done{opacity:0;pointer-events:none}
.loader-card{width:min(360px,86%);text-align:center}
.loader-card h2{font-size:22px}
.load-rows{list-style:none;padding:0;margin:16px 0 0;text-align:left}
.load-rows li{display:grid;grid-template-columns:1fr auto;gap:4px 10px;align-items:center;font-size:15px;margin:10px 0}
.load-rows .bar{grid-column:1/-1;height:5px;border-radius:5px;background:rgba(255,255,255,.08);overflow:hidden}
.load-rows .bar i{display:block;height:100%;width:0;background:var(--ha-ring);transition:width .2s}
.load-rows .s{font:500 13px var(--mono);color:var(--muted)}
.error-card{max-width:440px;padding:24px;text-align:center}
.webgl-fallback img{border-radius:12px;margin:12px auto}

/* details */
.tabs{display:flex;gap:4px;padding:4px;border-radius:13px;background:rgba(0,0,0,.2);border:1px solid var(--line);margin-bottom:18px;position:sticky;top:0;z-index:2}
.tabs button{flex:1;min-height:42px;border-radius:9px;border:0;background:none;color:var(--muted);font:600 15px var(--font);cursor:pointer}
.tabs button[aria-selected=true]{background:var(--teal-btn);color:#fff}
.xp-right .xp-panel-inner{padding-top:12px}
.d-name{font-size:28px;margin:6px 0}
.d-ids{font:500 13px var(--mono);color:var(--muted);margin:0 0 12px;word-break:break-word}
.d-sec{padding:16px 0;border-top:1px solid var(--line)}
.d-sec h3{color:var(--teal-text);font:600 14px var(--mono);letter-spacing:.08em;text-transform:uppercase;margin-bottom:8px}
.d-sec p{font-size:16px;margin:0 0 .7em}
.d-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:14px}
.d-actions .btn{min-height:44px;font-size:15px;padding:8px 10px}
.near{list-style:none;padding:0;margin:0}
.near li{margin:0}
.near button{display:flex;justify-content:space-between;width:100%;gap:10px;min-height:44px;padding:8px 10px;border-radius:9px;border:0;background:none;color:var(--text);font:500 15.5px var(--font);text-align:left;cursor:pointer}
.near button:hover{background:rgba(var(--accent-rgb),.1)}
.near .k{font:500 12.5px var(--mono);color:var(--muted)}
.locate{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.locate button{display:flex;align-items:center;gap:14px;width:100%;min-height:54px;padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:rgba(0,0,0,.18);color:#fff;font:500 16px var(--font);cursor:pointer;text-align:left}
.locate button:hover,.locate button[aria-current=true]{border-color:rgba(var(--accent-rgb),.7);background:rgba(0,91,213,.18)}
.locate .num{font:600 14px var(--mono);color:var(--teal-text)}
.locate .go{margin-left:auto;color:var(--teal-text);font-size:15px}
.ask{border:1px dashed var(--line-strong);border-radius:14px;padding:16px;background:rgba(255,255,255,.02)}
.ask .btn{width:100%;margin-top:8px}
.exercise{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-top:1px solid var(--line)}
.exercise:first-child{border-top:0}
.exercise b{display:block;color:#fff}
.age-now{display:flex;align-items:baseline;gap:10px}
.age-now b{font:600 44px var(--display);color:#fff}
.change{border:1px solid var(--line);border-radius:14px;padding:14px;margin:10px 0;background:rgba(255,255,255,.02)}
.change h3{display:flex;align-items:center;gap:8px;font-size:16px;color:#fff;text-transform:none;letter-spacing:0;font-family:var(--font)}
.meter{height:8px;border-radius:8px;background:rgba(255,255,255,.08);overflow:hidden;margin:8px 0}
.meter i{display:block;height:100%;background:var(--ha-ring);transition:width var(--t-med) var(--ease)}
.due{list-style:none;padding:0;margin:0}
.due li{display:flex;gap:10px;padding:10px 0;border-top:1px solid var(--line);font-size:15.5px}
.due li:first-child{border-top:0}
.due .ico{color:var(--teal-text);flex:none;width:20px;height:20px;margin-top:2px}
.lesson-card{border:1px solid var(--line);border-radius:14px;padding:14px;margin:10px 0;background:rgba(255,255,255,.02)}
.lesson-card h3{color:#fff;font-size:17px;text-transform:none;letter-spacing:0;font-family:var(--font)}
.chapters{list-style:none;padding:0;margin:10px 0 0;counter-reset:ch}
.chapters li{display:flex;align-items:center;gap:10px;min-height:40px;font-size:15px;color:var(--muted);counter-increment:ch}
.chapters li::before{content:counter(ch);width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font:600 12.5px var(--mono);border:1px solid var(--line-strong)}
.chapters li.free{color:var(--text)}
.chapters li.done::before{background:var(--teal-btn);border-color:var(--teal-btn);color:#fff}
.upgrade{border:1px solid rgba(212,168,83,.6);border-radius:16px;padding:18px;background:rgba(212,168,83,.1)}
.upgrade h3{color:#fff;font-size:19px;text-transform:none;letter-spacing:0;font-family:var(--display)}
.quiz button.opt{display:block;width:100%;text-align:left;min-height:46px;margin:6px 0;padding:10px 14px;border-radius:10px;border:1px solid var(--line-strong);background:rgba(0,0,0,.18);color:var(--text);font:500 15.5px var(--font);cursor:pointer}
.quiz button.opt.right{border-color:var(--ok);background:rgba(95,211,154,.12)}
.quiz button.opt.wrong{border-color:var(--danger);background:rgba(255,107,107,.1)}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:80;background:#02121c;border:1px solid var(--teal-text);color:#fff;padding:12px 18px;border-radius:12px;font-size:15.5px;box-shadow:var(--shadow);display:none}

/* bottom nav + sheets (phones & small tablets) */
.bottom-nav{display:none}
.sheet-head{display:none}
@media (max-width:1180px) and (min-width:901px){.xp{grid-template-columns:290px minmax(0,1fr) 330px}}
@media (max-width:900px){
  .xp{display:block;position:relative;height:calc(100dvh - var(--header-h));padding:0;min-height:0}
  .xp-stage{position:absolute;inset:0 0 calc(64px + env(safe-area-inset-bottom)) 0;border-radius:0;border:0}
  .xp-panel{position:fixed;left:0;right:0;bottom:calc(64px + env(safe-area-inset-bottom));z-index:30;max-height:min(68dvh,640px);border-radius:20px 20px 0 0;border-bottom:0;
    background:var(--surface-solid);transform:translateY(105%);transition:transform var(--t-med) var(--ease);box-shadow:0 -20px 50px rgba(0,0,0,.45)}
  .xp-panel.open{transform:none}
  .xp-panel.expanded{max-height:calc(100dvh - var(--header-h) - 80px)}
  .sheet-head{display:flex;align-items:center;justify-content:space-between;gap:8px;position:sticky;top:0;z-index:3;padding:8px 12px 8px 20px;background:var(--surface-solid);border-bottom:1px solid var(--line);touch-action:none}
  .sheet-head .grab{position:absolute;left:50%;top:6px;transform:translateX(-50%);width:44px;height:5px;border-radius:5px;background:var(--line-strong)}
  .sheet-head h2{font-size:18px;margin:8px 0 0}
  .sheet-head .btn-ghost{min-width:44px}
  .bottom-nav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:31;height:calc(64px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--ha-midnight);border-top:1px solid var(--line)}
  .bottom-nav button{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;border:0;background:none;color:var(--muted);font:600 12.5px var(--font);cursor:pointer;min-height:56px}
  .bottom-nav button svg{width:22px;height:22px}
  .bottom-nav button[aria-pressed=true]{color:var(--teal-text)}
  .toolbar{top:auto;bottom:150px;transform:none;right:8px;flex-direction:column}
  .toolbar .opt-m,.toolbar [data-tool=in],.toolbar [data-tool=out],.toolbar .sep{display:none}
  .hs{width:32px;height:32px;font-size:12px;box-shadow:0 0 0 4px rgba(1,152,251,.3)}
  .hs:not(.ring)::after{width:16px}.hs:not(.ring)::before{left:calc(100% + 16px)}
  .xp-panel{max-height:48dvh}
  .toolbar button{width:44px;height:44px}
  .tip{display:none}
  .stage-top{left:10px;right:10px;top:10px;flex-wrap:wrap}
  .modes{order:2;width:100%;overflow-x:auto}
  .body-switch{order:1}
  .body-switch button{font-size:13.5px;padding:6px 10px}
  .body-note{top:auto;bottom:150px;left:10px;right:62px;max-width:none;font-size:12.5px;padding:8px 10px}
  .compare-labels{top:118px}
  .modes button{font-size:13.5px;padding:6px 10px}
  .counter{display:none}
  .crumb{top:auto;bottom:150px;left:10px;max-width:calc(100% - 80px)}
  .stage-bottom{left:8px;right:8px;bottom:8px}
  .timeline{padding:8px 12px}
  .timeline .row1{flex-wrap:wrap;gap:6px 12px}
  .timeline .age-track{order:3;flex-basis:100%}
  .timeline .age{font-size:18px;min-width:52px}
  .popover{position:fixed;left:12px;right:12px;bottom:140px;top:auto;transform:none;width:auto}
  .section-ctl{width:auto;flex:1}
  .site-footer{display:none}
}
@media (max-width:900px){.xp-page .site-footer{display:none}}

.hs.ring::after{content:"";position:absolute;top:50%;height:1px;width:var(--len,0);background:rgba(242,181,68,.65);pointer-events:none}
.hs.ring.l::after{left:100%}.hs.ring.r::after{right:100%;background:rgba(242,181,68,.65)}