/* Solar System Lab — shared instrument theme. Dark-only by design (it is a mission-ops console).
   Layout: sticky nav, page header, then a controls column beside a results column; stacks on phones. */
:root{
  --void:#05070d;
  --surface:#0a0f1b;
  --surface2:#0f1626;
  --line:rgba(150,168,210,.15);
  --line2:rgba(150,168,210,.3);
  --fg:#e6e9f2;
  --muted:#8a94ae;
  --sun:#f2b04a;
  --sun-rgb:242,176,74;
  --sun-hi:#ffd68a;
  --sun-lo:#c9832a;
  --on-sun:#1a1206;
  --cool:#86b6ff;
  --good:#6fd1a2;
  --warn:#e9cf5c;
  --alert:#ff8a6e;
  --f-display:"Michroma","Eurostile","Trebuchet MS",sans-serif;
  --f-body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  color-scheme:dark;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{background:var(--void)}
body{margin:0;background:var(--void);color:var(--fg);font:14px/1.55 var(--f-body);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--void)}
a{color:var(--cool)}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--sun);outline-offset:2px}

/* nav */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(5,7,13,.93);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:6px;padding-block:10px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));overflow-x:auto;scrollbar-width:none}
.nav .mark{font:400 12px/1 var(--f-display);letter-spacing:.18em;color:var(--fg);text-decoration:none;margin-right:14px;white-space:nowrap}
.nav a.tab{font-size:13px;color:var(--muted);text-decoration:none;padding:7px 11px;border-radius:7px;white-space:nowrap}
.nav a.tab:hover{color:var(--fg);background:rgba(150,168,210,.08)}
.nav a.tab[aria-current="page"]{color:var(--fg);background:rgba(150,168,210,.13)}

/* page */
.wrap{max-width:1340px;margin:0 auto;padding-block:26px 56px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.phead{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px 24px;margin-bottom:22px}
.phead h1{margin:0 0 6px;font:400 clamp(20px,3vw,28px)/1.15 var(--f-display);letter-spacing:.06em;text-wrap:balance}
.phead p{margin:0;max-width:68ch;color:var(--muted)}
.eyebrow{font:500 10.5px/1 var(--f-mono);letter-spacing:.16em;text-transform:uppercase;color:var(--sun);margin-bottom:10px}
.layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:20px;align-items:start}
.layout>*{min-width:0}
.stack{display:flex;flex-direction:column;gap:16px;min-width:0}
.card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:16px;min-width:0}
.card h2,.card h3{margin:0 0 12px;font:500 10.5px/1 var(--f-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.card h2 b{color:var(--fg);font-weight:500}
.row{display:flex;flex-wrap:wrap;gap:16px;min-width:0}
.row>*{flex:1 1 260px;min-width:0}
@media (max-width:920px){.layout{grid-template-columns:1fr}}

/* controls */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field:last-child{margin-bottom:0}
.field label,.flabel{display:flex;justify-content:space-between;gap:10px;font-size:12.5px;color:var(--muted)}
.field label output,.field label .v{color:var(--fg);font:500 12px/1.4 var(--f-mono);font-variant-numeric:tabular-nums}
input[type=range]{width:100%;accent-color:var(--sun);margin:2px 0}
select,input[type=number],input[type=text]{background:var(--surface2);border:1px solid var(--line2);border-radius:7px;padding:8px 10px;width:100%}
input[type=file]{font-size:12px;color:var(--muted);max-width:100%}
input[type=file]::file-selector-button{background:var(--surface2);color:var(--fg);border:1px solid var(--line2);border-radius:6px;padding:6px 10px;margin-right:8px;cursor:pointer}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:9px 14px;border-radius:7px;border:1px solid var(--line2);background:var(--surface2);color:var(--fg);cursor:pointer;font-size:13px;font-weight:500;white-space:nowrap}
.btn:hover{border-color:var(--sun)}
.btn.primary{background:var(--sun);border-color:var(--sun);color:var(--on-sun)}
.btn.primary:hover{filter:brightness(1.08)}
.btn:disabled{opacity:.5;cursor:default}
.btns{display:flex;flex-wrap:wrap;gap:8px}
.seg{display:flex;border:1px solid var(--line2);border-radius:7px;overflow:hidden;flex-wrap:wrap}
.seg button{flex:1;background:none;border:0;border-right:1px solid var(--line2);padding:8px 10px;font-size:12.5px;color:var(--muted);cursor:pointer;white-space:nowrap}
.seg button:last-child{border-right:0}
.seg button[aria-pressed="true"]{background:rgba(var(--sun-rgb),.16);color:var(--sun)}
.check{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--fg);cursor:pointer}
.check input{accent-color:var(--sun);width:16px;height:16px}
.hint{font-size:12px;color:var(--muted);line-height:1.5;margin:8px 0 0}
.divider{height:1px;background:var(--line);margin:14px 0}

/* data display */
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.stat{padding:14px;border:1px solid var(--line);border-radius:9px;background:var(--surface)}
.stat .k{font:500 10.5px/1.2 var(--f-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.stat .n{font:500 26px/1.1 var(--f-mono);margin-top:8px;font-variant-numeric:tabular-nums}
.stat .s{font-size:12px;color:var(--muted);margin-top:4px}
.pill{display:inline-flex;align-items:center;gap:6px;font:500 11px/1 var(--f-mono);padding:5px 8px;border-radius:5px;border:1px solid var(--line2);color:var(--muted);white-space:nowrap}
.pill.good{color:var(--good);border-color:rgba(111,209,162,.5)}
.pill.warn{color:var(--warn);border-color:rgba(233,207,92,.5)}
.pill.bad{color:var(--alert);border-color:rgba(255,138,110,.55)}
.pill.info{color:var(--cool);border-color:rgba(134,182,255,.5)}
.bar{height:6px;border-radius:3px;background:rgba(150,168,210,.12);overflow:hidden}
.bar i{display:block;height:100%;background:var(--sun);border-radius:3px}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px}
table{border-collapse:collapse;width:100%;font-size:12.5px}
th,td{padding:7px 10px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
th{font:500 10.5px/1.2 var(--f-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);background:var(--surface2);position:sticky;top:0}
td.num,th.num{text-align:right;font-family:var(--f-mono);font-variant-numeric:tabular-nums}
tr:last-child td{border-bottom:0}
.viewport{position:relative;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#000}
.viewport canvas{display:block;width:100%;height:auto}
svg text{font-family:var(--f-mono)}
.empty{color:var(--muted);font-size:13px;padding:8px 0}
.progress{height:3px;background:rgba(150,168,210,.12);border-radius:2px;overflow:hidden}
.progress i{display:block;height:100%;width:0;background:var(--sun);transition:width .15s}
.foot{margin-top:28px;font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:14px}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:12px;color:var(--muted)}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend i{width:10px;height:10px;border-radius:2px;display:inline-block}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:32px}
.pager a{display:flex;flex-direction:column;gap:5px;padding:14px 16px;border:1px solid var(--line);border-radius:10px;text-decoration:none;color:var(--fg);font-weight:500;font-size:14.5px;background:var(--surface);transition:border-color .2s}
.pager a:hover{border-color:rgba(var(--sun-rgb),.55)}
.pager small{font:500 10.5px/1 var(--f-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.pager .next{text-align:right;grid-column:2}
.pager .prev::after{content:""}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ===== motion layer ===== */
.has-stars body{background:transparent}
.bgstars{position:fixed;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none}
.nav .mark{display:inline-flex;align-items:center;gap:9px}
.logo{width:22px;height:22px;flex:none;overflow:visible}
.logo .orb{transform-box:view-box;transform-origin:12px 12px;animation:orbit 5s linear infinite}
.logo .core{filter:drop-shadow(0 0 4px rgba(var(--sun-rgb),.8));animation:corePulse 3s ease-in-out infinite;transform-box:fill-box;transform-origin:center}
@keyframes orbit{to{transform:rotate(360deg)}}
@keyframes corePulse{50%{transform:scale(1.12)}}
.nav-in.has-ind{position:relative}
.nav-ind{position:absolute;left:0;top:0;border-radius:7px;background:rgba(150,168,210,.14);box-shadow:inset 0 -2px 0 var(--sun);opacity:0;pointer-events:none;z-index:0}
.nav-ind.ready{transition:transform .38s cubic-bezier(.2,.8,.2,1),width .38s cubic-bezier(.2,.8,.2,1),opacity .2s}
.nav-in.has-ind a.tab{position:relative;z-index:1}
.nav-in.has-ind a.tab[aria-current="page"],.nav-in.has-ind a.tab:hover{background:transparent}
.card,.stat{background:radial-gradient(460px circle at var(--mx,-999px) var(--my,-999px),rgba(var(--sun-rgb),.075),transparent 42%),rgba(10,15,27,.84);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);transition:border-color .3s,box-shadow .3s}
.card:hover,.stat:hover{border-color:rgba(var(--sun-rgb),.28)}
.pager a{background:radial-gradient(300px circle at var(--mx,-999px) var(--my,-999px),rgba(var(--sun-rgb),.1),transparent 45%),rgba(10,15,27,.84)}
.pager .next::after{content:" →";display:inline-block;transition:transform .3s}
.pager .prev{flex-direction:column}
.pager .prev small::before{content:"← "}
.pager a:hover::after{transform:translateX(5px)}
.btn,.seg button{position:relative;overflow:hidden;isolation:isolate}
.ripple{position:absolute;border-radius:50%;background:rgba(255,214,150,.3);transform:scale(0);animation:rip .7s ease-out forwards;pointer-events:none;z-index:-1}
@keyframes rip{to{transform:scale(1);opacity:0}}
.btn.primary{background-image:linear-gradient(110deg,transparent 35%,rgba(255,255,255,.45) 48%,transparent 62%);background-size:260% 100%;background-position:130% 0;background-repeat:no-repeat}
.btn{transition:border-color .2s,transform .2s,box-shadow .25s}
.btn:hover{transform:translateY(-1px)}
.btn.primary:hover{box-shadow:0 8px 30px -8px rgba(var(--sun-rgb),.7)}
.progress i{background:linear-gradient(90deg,var(--sun),var(--sun-hi),var(--sun));background-size:200% 100%;animation:flow 1.1s linear infinite}
@keyframes flow{to{background-position:-200% 0}}
.bar i{transition:width .9s cubic-bezier(.2,.8,.2,1)}
@media (prefers-reduced-motion:no-preference){
  .enter{animation:rise .8s cubic-bezier(.2,.8,.2,1) both;animation-delay:calc(var(--i,0)*70ms + .05s)}
  .stat.pop{animation:pop .6s cubic-bezier(.2,.9,.3,1.2) both;animation-delay:calc(var(--i,0)*80ms)}
  .phead h1{background:linear-gradient(100deg,var(--fg) 38%,var(--sun-hi) 50%,var(--fg) 62%);background-size:320% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:titleShine 2.6s .35s both}
  .eyebrow{animation:rise .7s both}
  .btn.primary:hover{animation:shine 1.1s ease}
  .pill.good,.pill.bad,.pill.warn{animation:pillIn .45s both}
}
@keyframes rise{from{opacity:0;transform:translateY(22px) scale(.985)}to{opacity:1;transform:none}}
@keyframes pop{from{opacity:0;transform:translateY(10px) scale(.94)}to{opacity:1;transform:none}}
@keyframes titleShine{from{background-position:100% 0}to{background-position:0 0}}
@keyframes shine{from{background-position:130% 0}to{background-position:-40% 0}}
@keyframes pillIn{from{opacity:0;transform:scale(.85)}to{opacity:1;transform:none}}

/* ===== narration: nav button + player dock ===== */
/* nav listen button: voice-waveform pill that sits right after the last tab */
.navlisten{position:relative;flex:none;display:inline-flex;align-items:center;gap:9px;height:34px;margin-left:2px;margin-right:max(14px,env(safe-area-inset-right,0px));padding:0 13px 0 11px;border-radius:9px;border:1px solid rgba(var(--sun-rgb),.42);background:linear-gradient(180deg,rgba(var(--sun-rgb),.12),rgba(var(--sun-rgb),.04));color:var(--fg);cursor:pointer;font:inherit;transition:border-color .25s,box-shadow .3s,background .3s}
.navlisten::before{content:"";position:absolute;left:-9px;top:50%;width:1px;height:20px;margin-top:-10px;background:var(--line2)}
.nav .nav-in+.navlisten{margin-left:4px}
.navlisten:hover{border-color:var(--sun);box-shadow:0 0 0 3px rgba(var(--sun-rgb),.12),0 8px 26px -12px rgba(var(--sun-rgb),.7);background:linear-gradient(180deg,rgba(var(--sun-rgb),.2),rgba(var(--sun-rgb),.06))}
.navlisten[aria-pressed="true"]{border-color:var(--sun);background:linear-gradient(180deg,rgba(var(--sun-rgb),.22),rgba(var(--sun-rgb),.08))}
.navlisten .wave{display:inline-flex;align-items:center;gap:2.5px;height:18px;flex:none}
.navlisten .wave i{display:block;width:3px;height:18px;border-radius:2px;background:linear-gradient(180deg,var(--sun-hi),var(--sun));transform-origin:center;transform:scaleY(var(--h,.4))}
.navlisten .wave i:nth-child(1){--h:.35}.navlisten .wave i:nth-child(2){--h:.7}.navlisten .wave i:nth-child(3){--h:1}.navlisten .wave i:nth-child(4){--h:.6}.navlisten .wave i:nth-child(5){--h:.3}
.navlisten[aria-pressed="true"] .wave i{transform:scaleY(calc(.22 + var(--lv,.4) * var(--k,1)));transition:transform .08s linear}
.navlisten .wave i:nth-child(1){--k:.55}.navlisten .wave i:nth-child(2){--k:.95}.navlisten .wave i:nth-child(3){--k:1.25}.navlisten .wave i:nth-child(4){--k:.85}.navlisten .wave i:nth-child(5){--k:.5}
@media (prefers-reduced-motion:no-preference){.navlisten:not([aria-pressed="true"]) .wave i{animation:breathe 2.2s ease-in-out infinite}.navlisten .wave i:nth-child(2){animation-delay:.15s}.navlisten .wave i:nth-child(3){animation-delay:.3s}.navlisten .wave i:nth-child(4){animation-delay:.45s}.navlisten .wave i:nth-child(5){animation-delay:.6s}}
@keyframes breathe{0%,100%{transform:scaleY(var(--h))}50%{transform:scaleY(calc(var(--h) * .45 + .1))}}
.navlisten .lt{display:flex;align-items:baseline;gap:8px;line-height:1}
.navlisten .lt b{font:600 13.5px/1 "Noto Sans Devanagari",var(--f-body);white-space:nowrap}
.navlisten .lt small{font:500 10.5px/1 var(--f-mono);color:var(--sun);opacity:.85;font-variant-numeric:tabular-nums;white-space:nowrap}
.navlisten .prog{position:absolute;left:8px;right:8px;bottom:3px;height:2px;border-radius:2px;overflow:hidden;background:rgba(var(--sun-rgb),.12)}
.navlisten .prog i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--sun),var(--sun-hi))}
@media (max-width:720px){.navlisten .lt small{display:none}}
@media (max-width:440px){.navlisten{padding:0 10px}.navlisten .lt{display:none}}

.nav{display:flex;align-items:center}
.nav .nav-in{flex:0 1 auto;min-width:0;padding-right:6px}
.narr{position:fixed;z-index:35;left:0;right:0;margin-inline:auto;bottom:calc(16px + env(safe-area-inset-bottom,0px));width:min(820px,calc(100% - 24px));padding:14px 16px 12px;border:1px solid rgba(var(--sun-rgb),.35);border-radius:18px;background:linear-gradient(180deg,rgba(14,19,34,.92),rgba(6,9,18,.94));backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 30px 90px -30px rgba(var(--sun-rgb),.4),0 0 0 1px rgba(255,255,255,.02) inset;animation:dockIn .5s cubic-bezier(.2,.8,.2,1) both}
@keyframes dockIn{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
.narr:focus-visible{outline:2px solid var(--sun);outline-offset:3px}
.narr-main{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:14px;align-items:center}
.np{position:relative;width:52px;height:52px;border-radius:50%;border:0;padding:0;cursor:pointer;background:none;display:grid;place-items:center}
.np .core{position:absolute;inset:5px;border-radius:50%;background:radial-gradient(circle at 50% 35%,rgba(var(--sun-rgb),.22),rgba(10,15,27,.95) 70%);border:1px solid rgba(var(--sun-rgb),.55);transition:transform .2s,background .2s}
.np:hover .core{transform:scale(1.06)}
.np svg.ring{position:absolute;inset:0;width:100%;height:100%;transform:rotate(-90deg)}
.np svg.ring circle{fill:none;stroke-width:3}
.np .ico{position:relative;width:18px;height:18px;fill:var(--sun-hi)}
.narr-cap{min-width:0}
.narr-line{margin:0;font:500 clamp(17px,2.3vw,25px)/1.45 var(--f-body);min-height:1.45em;text-wrap:balance}
.narr-line[lang="hi"]{font-family:"Noto Sans Devanagari","Mangal","Kohinoor Devanagari",var(--f-body)}
.narr-line .w{color:rgba(230,233,242,.32);transition:color .25s,text-shadow .25s}
.narr-line .w.on{color:var(--fg)}
.narr-line .w.now{color:var(--sun-hi);text-shadow:0 0 18px rgba(var(--sun-rgb),.55)}
.narr-sub{margin:4px 0 0;font-size:13px;color:var(--muted);min-height:1.2em}
.narr-side{display:flex;flex-direction:column;align-items:flex-end;gap:8px}
.narr-side .row1{display:flex;gap:6px}
.narr-side .seg button{padding:6px 11px;font-size:12px}
.ib2{width:32px;height:30px;display:grid;place-items:center;border:1px solid var(--line2);border-radius:8px;background:rgba(15,22,38,.8);color:var(--fg);cursor:pointer}
.ib2:hover{border-color:var(--sun)}
.ib2 svg{width:14px;height:14px;fill:currentColor}
.narr-viz{display:block;width:100%;height:34px;margin:10px 0 6px}
.narr-seek{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:10px;align-items:center;font:400 11px/1 var(--f-mono);color:var(--muted);font-variant-numeric:tabular-nums}
.seek{position:relative;height:18px;cursor:pointer;touch-action:none}
.seek .track{position:absolute;left:0;right:0;top:7px;height:4px;border-radius:2px;background:rgba(150,168,210,.16)}
.seek .fill{position:absolute;left:0;top:7px;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--sun-lo),var(--sun),var(--sun-hi));width:0}
.seek .tick{position:absolute;top:5px;width:2px;height:8px;border-radius:1px;background:rgba(230,233,242,.28)}
.seek .knob{position:absolute;top:3px;width:12px;height:12px;margin-left:-6px;border-radius:50%;background:var(--sun-hi);box-shadow:0 0 12px rgba(var(--sun-rgb),.8);left:0;transition:transform .15s}
.seek:hover .knob{transform:scale(1.25)}
.seek .hov{position:absolute;bottom:20px;transform:translateX(-50%);padding:3px 6px;border-radius:5px;background:#0e1424;border:1px solid var(--line2);color:var(--fg);white-space:nowrap;pointer-events:none;opacity:0;transition:opacity .15s}
.seek:hover .hov{opacity:1}
.narr-keys{margin:6px 0 0;font:400 10.5px/1.4 var(--f-mono);color:rgba(138,148,174,.7)}
@media (max-width:620px){.narr-main{grid-template-columns:auto minmax(0,1fr)}.narr-side{grid-column:1/3;grid-row:1;flex-direction:row;justify-content:space-between;align-items:center}.narr-keys{display:none}.np{width:46px;height:46px}}
@media (prefers-reduced-motion:reduce){.narr{animation:none}}


.np svg.ring circle{stroke:rgba(var(--sun-rgb),.18)}
.np svg.ring circle.arc{stroke:var(--sun-hi)}