/* Heirloom welcome · v0.20.0 — static, dependency-free; decoration never intercepts input. */
:root{
  --ink:#0b1417;--ink-deep:#060c0e;--gold:#c9a96a;--gold-soft:#e6d6ab;--cream:#f2ead8;--mist:rgba(242,234,216,.66);
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,"Times New Roman",serif;
  --sans:"Avenir Next","Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--ink-deep)}
body{margin:0;min-height:100vh;min-height:100svh;display:flex;flex-direction:column;color:var(--cream);font-family:var(--sans);
  background:radial-gradient(120% 90% at 50% 38%,#12222a 0%,var(--ink) 45%,var(--ink-deep) 100%);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}

/* ---- Atmosphere (all aria-hidden, pointer-events none) ---- */
.sky{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.sky>*{position:absolute;inset:0;pointer-events:none}
.sky-nebula{inset:-12%;background:url("echo-study/assets/nebula.png") center 42%/cover no-repeat;opacity:.34;mix-blend-mode:screen;
  filter:saturate(.75) sepia(.18);animation:nebula-drift 90s ease-in-out infinite alternate}
.sky-stars{background-repeat:repeat}
.sky-stars--far{opacity:.55;background-size:340px 340px;background-image:
  radial-gradient(1px 1px at 23px 41px,#f2ead8 50%,transparent 51%),radial-gradient(1px 1px at 141px 97px,#e6d6ab 50%,transparent 51%),
  radial-gradient(1px 1px at 287px 22px,#f2ead8 50%,transparent 51%),radial-gradient(1px 1px at 63px 211px,#c9a96a 50%,transparent 51%),
  radial-gradient(1px 1px at 219px 263px,#f2ead8 50%,transparent 51%),radial-gradient(1px 1px at 318px 176px,#e6d6ab 50%,transparent 51%),
  radial-gradient(1px 1px at 172px 318px,#f2ead8 50%,transparent 51%)}
.sky-stars--near{opacity:.75;background-size:560px 560px;background-image:
  radial-gradient(1.5px 1.5px at 88px 132px,#fff6df 50%,transparent 51%),radial-gradient(1.4px 1.4px at 402px 61px,#e6d6ab 50%,transparent 51%),
  radial-gradient(1.6px 1.6px at 497px 388px,#fff6df 50%,transparent 51%),radial-gradient(1.3px 1.3px at 231px 471px,#c9a96a 50%,transparent 51%);
  animation:twinkle 7s ease-in-out infinite alternate}
.sky-canvas{width:100%;height:100%;opacity:0;transition:opacity 2.4s ease}
.js-sky .sky-canvas{opacity:1}
.sky-orbits{display:grid;place-items:center}
.orbit{grid-area:1/1;border-radius:50%;border:1px solid rgba(201,169,106,.13);aspect-ratio:1}
.orbit--1{width:min(56vmin,520px);border-color:rgba(201,169,106,.2)}
.orbit--2{width:min(86vmin,820px);transform:rotateX(68deg) rotateZ(-18deg);border-style:dashed;border-color:rgba(230,214,171,.09);animation:orbit-turn 160s linear infinite}
.orbit--3{width:min(128vmin,1240px);transform:rotateX(72deg) rotateZ(24deg);animation:orbit-turn 240s linear infinite reverse}
.orbit--1::after{content:"";position:absolute;width:5px;height:5px;margin:-2.5px;border-radius:50%;background:var(--gold-soft);box-shadow:0 0 12px 2px rgba(230,214,171,.55);top:14.6%;left:85.4%}
.sky-vignette{background:radial-gradient(75% 70% at 50% 45%,transparent 40%,rgba(4,8,10,.78) 100%)}

@keyframes nebula-drift{from{transform:scale(1) translate3d(0,0,0)}to{transform:scale(1.08) translate3d(-1.5%,1%,0)}}
@keyframes twinkle{from{opacity:.45}to{opacity:.85}}
@keyframes orbit-turn{to{transform:rotateX(70deg) rotateZ(342deg)}}
.orbit--3{animation-name:orbit-turn-b}
@keyframes orbit-turn-b{from{transform:rotateX(72deg) rotateZ(24deg)}to{transform:rotateX(72deg) rotateZ(-336deg)}}
.orbit--2{animation-name:orbit-turn-a}
@keyframes orbit-turn-a{from{transform:rotateX(68deg) rotateZ(-18deg)}to{transform:rotateX(68deg) rotateZ(342deg)}}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@keyframes halo{from{opacity:.55;transform:scale(.96)}to{opacity:.9;transform:scale(1.04)}}

/* ---- Content ---- */
.welcome-main{position:relative;z-index:1;flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:clamp(2.4rem,7vh,4.5rem);padding:clamp(2.5rem,8vh,5.5rem) 1.25rem 2rem;text-align:center}
.welcome-brand{position:relative;display:flex;flex-direction:column;align-items:center;animation:rise 1.4s cubic-bezier(.2,.7,.2,1) both}
.welcome-halo{position:absolute;top:0;left:50%;width:clamp(150px,30vmin,240px);aspect-ratio:1;translate:-50% -18%;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,rgba(230,214,171,.22) 0%,rgba(201,169,106,.08) 38%,transparent 70%);animation:halo 6s ease-in-out infinite alternate}
.welcome-symbol{position:relative;width:clamp(68px,13vmin,104px);height:auto;filter:drop-shadow(0 0 18px rgba(201,169,106,.35))}
.welcome-wordmark{margin:clamp(1rem,3vh,1.6rem) 0 0;font:400 clamp(2.6rem,9vw,5.2rem)/1 var(--serif);letter-spacing:.015em;color:var(--cream);
  background:linear-gradient(180deg,#fbf5e6 0%,#e6d6ab 70%,#c9a96a 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  text-shadow:0 0 40px rgba(201,169,106,.12)}
.welcome-message{margin:clamp(1rem,2.6vh,1.5rem) 0 0;display:flex;flex-direction:column;align-items:center;gap:.6rem;
  font:italic 400 clamp(1rem,2.3vw,1.22rem)/1.45 var(--serif);color:var(--mist);max-width:34rem}
.welcome-rule{display:block;width:2.4rem;height:1px;background:linear-gradient(90deg,transparent,var(--gold),transparent);opacity:.7}

.welcome-choice{width:100%;max-width:40rem;animation:rise 1.4s .35s cubic-bezier(.2,.7,.2,1) both}
.welcome-prompt{margin:0 0 1.4rem;font:500 .74rem/1.6 var(--sans);letter-spacing:.28em;text-transform:uppercase;color:var(--gold-soft)}
.welcome-prompt-sep{margin:0 .8em;color:var(--gold);opacity:.7}
/* ---- Celestial portals: centred text, constellation behind, gentle depth ---- */
.welcome-options{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:clamp(.8rem,2.4vw,1.25rem)}
.welcome-options>li{perspective:900px;min-width:0}
.welcome-option{--rx:0deg;--ry:0deg;--lift:0px;--ease:cubic-bezier(.2,.7,.2,1);
  position:relative;display:flex;align-items:center;justify-content:center;min-height:7.4rem;padding:1.5rem 1.25rem;
  text-align:center;text-decoration:none;color:var(--cream);border-radius:4px;isolation:isolate;transform-style:preserve-3d;
  border:1px solid rgba(201,169,106,.32);
  background:radial-gradient(90% 120% at 50% 50%,rgba(18,34,42,.82) 0%,rgba(9,17,20,.88) 70%),linear-gradient(160deg,rgba(242,234,216,.06),rgba(11,20,23,.5));
  box-shadow:0 18px 40px -24px rgba(0,0,0,.9),inset 0 1px 0 rgba(242,234,216,.06);
  transform:translateY(var(--lift)) rotateX(var(--rx)) rotateY(var(--ry));
  transition:border-color .45s ease,transform .5s var(--ease),box-shadow .45s ease}
.welcome-option.is-tilting{transition:border-color .45s ease,transform .12s linear,box-shadow .45s ease}
.option-field,.option-stars{position:absolute;inset:0;border-radius:inherit;overflow:hidden;pointer-events:none}
.option-field svg,.option-stars svg{display:block;width:100%;height:100%}
.option-field{z-index:0;transform:translateZ(-10px) scale(1.02);transition:opacity .5s ease}
.option-stars{z-index:1;transform:translateZ(10px)}
.option-text{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;gap:.45rem;max-width:100%;transform:translateZ(24px)}
/* soft dark well keeps type crisp above any glow */
.option-text::before{content:"";position:absolute;inset:-.9rem -1.6rem;z-index:-1;border-radius:50%;pointer-events:none;
  background:radial-gradient(closest-side,rgba(8,15,18,.7),rgba(8,15,18,0))}
.option-name{font:400 clamp(1.6rem,3.8vw,2rem)/1.1 var(--serif);letter-spacing:.01em;color:var(--cream)}
.option-label{font:500 .74rem/1.4 var(--sans);letter-spacing:.18em;text-transform:uppercase;color:var(--gold-soft);
  padding-bottom:.25rem;border-bottom:1px solid rgba(201,169,106,.45);transition:border-color .45s ease,color .45s ease}

.pf-dust circle{fill:#f2ead8;opacity:.35;transition:opacity .6s ease}
.pf-orbits ellipse{fill:none;stroke:rgba(201,169,106,.16);stroke-width:.8;vector-effect:non-scaling-stroke;transition:stroke .6s ease}
.pf-orbits .pf-trail{stroke:rgba(246,232,196,.0);stroke-width:1.4;stroke-dasharray:9 91;stroke-linecap:round}
.option-stars g{transform-box:view-box;transform-origin:200px 80px;transition:transform .9s var(--ease),opacity .6s ease;opacity:.42}
.ps-left{transform:translateX(-8px)}.ps-right{transform:translateX(8px)}
.option-stars path{fill:none;stroke:rgba(201,169,106,.2);stroke-width:.7;vector-effect:non-scaling-stroke;stroke-dasharray:4 5;transition:stroke .6s ease}
.option-stars circle{fill:#e6d6ab;transition:filter .6s ease}

.welcome-option::after{content:"";position:absolute;inset:0;z-index:0;border-radius:inherit;pointer-events:none;opacity:0;
  background:radial-gradient(60% 80% at 50% 50%,rgba(201,169,106,.16),transparent 70%);transition:opacity .5s ease}

/* lit state: hover and keyboard focus are equal */
.welcome-option:hover,.welcome-option:focus-visible{--lift:-3px;border-color:rgba(230,214,171,.72);
  box-shadow:0 26px 50px -24px rgba(0,0,0,.95),0 0 36px -10px rgba(201,169,106,.42),inset 0 1px 0 rgba(242,234,216,.1)}
.welcome-option:hover::after,.welcome-option:focus-visible::after{opacity:1}
.welcome-option:hover .option-stars g,.welcome-option:focus-visible .option-stars g{opacity:1;transform:translateX(0) scale(.94)}
.welcome-option:hover .option-stars path,.welcome-option:focus-visible .option-stars path{stroke:rgba(230,214,171,.5)}
.welcome-option:hover .option-stars circle,.welcome-option:focus-visible .option-stars circle{filter:drop-shadow(0 0 3px rgba(246,226,170,.9))}
.welcome-option:hover .pf-orbits ellipse,.welcome-option:focus-visible .pf-orbits ellipse{stroke:rgba(201,169,106,.34)}
.welcome-option:hover .pf-orbits .pf-trail,.welcome-option:focus-visible .pf-orbits .pf-trail{stroke:rgba(246,232,196,.75);animation:trail 9s linear infinite}
.welcome-option:hover .pf-dust circle,.welcome-option:focus-visible .pf-dust circle{opacity:.7}
.welcome-option:hover .option-label,.welcome-option:focus-visible .option-label{color:#fbf1d6;border-color:var(--gold-soft)}
.welcome-option:focus{outline:none}
.welcome-option:focus-visible{outline:2px solid var(--gold-soft);outline-offset:4px}
.welcome-option:active{--lift:0px}
@keyframes trail{to{stroke-dashoffset:-100}}

.welcome-footer{position:relative;z-index:1;display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:.4rem .9rem;
  padding:1.2rem 1.25rem max(1.4rem,env(safe-area-inset-bottom));font:400 .74rem/1.5 var(--sans);letter-spacing:.06em;color:rgba(242,234,216,.5);text-align:center}
.welcome-footer-dot{width:3px;height:3px;border-radius:50%;background:var(--gold);opacity:.7}

/* ---- Responsive ---- */
@media (max-width:560px){
  .welcome-options{grid-template-columns:1fr}
  .welcome-option{min-height:6.4rem;padding:1.2rem 1rem}
  .welcome-prompt{letter-spacing:.2em}
  .welcome-prompt-sep{display:block;height:0;overflow:hidden;margin:0}
  .welcome-prompt span[lang]{display:block}
}
@media (max-width:360px){
  .welcome-main{padding-left:1rem;padding-right:1rem}
  .option-label{letter-spacing:.12em}
}
@media (max-height:520px) and (orientation:landscape){
  .welcome-main{flex-direction:row;flex-wrap:wrap;gap:1.2rem 3rem;padding:1.4rem 1.5rem 1rem}
  .welcome-brand{flex:0 1 auto}
  .welcome-symbol{width:56px}
  .welcome-wordmark{font-size:2.6rem;margin-top:.6rem}
  .welcome-message{font-size:.92rem;margin-top:.6rem;gap:.35rem}
  .welcome-choice{flex:0 1 26rem}
  .welcome-options{grid-template-columns:1fr}
  .welcome-option{min-height:4.8rem;padding:.8rem 1rem}
  .option-text{gap:.3rem}
  .welcome-prompt{margin-bottom:.8rem}
  .welcome-footer{padding-top:.4rem}
}

/* ---- Reduced motion: same composition, held still ---- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .welcome-halo{opacity:.75}
  .welcome-option,.welcome-option:hover,.welcome-option:focus-visible{--lift:0px;--rx:0deg;--ry:0deg;transform:none}
  .welcome-option:hover .option-stars g,.welcome-option:focus-visible .option-stars g{transform:none}
  .welcome-option:hover .pf-orbits .pf-trail,.welcome-option:focus-visible .pf-orbits .pf-trail{stroke-dashoffset:-30}
}
@media (forced-colors:active){
  .welcome-wordmark{-webkit-text-fill-color:CanvasText;background:none}
  .welcome-option{border-color:LinkText}
  .option-field,.option-stars,.welcome-option::after,.option-text::before{display:none}
  .option-label{border-color:LinkText}
}