/* ===================================================================
   AEON MOTORS — obsidian · silver · electric cyan
   Display: Michroma  ·  Text: Inter
   Motion language: aggressive-then-damped (fast attack, long settle)
   =================================================================== */

:root{
  --ink:#08090b;
  --ink-2:#0d0f13;
  --silver:#d8dde3;
  --dim:#8f99a5;
  --cyan:#3fd0ff;
  --cyan-dim:rgba(63,208,255,.32);
  --line:rgba(216,221,227,.10);
  --disp:"Michroma",sans-serif;
  --text:"Inter",system-ui,sans-serif;
  --snap:cubic-bezier(.07,.9,.14,1);   /* aggressive attack, damped settle */
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  background:var(--ink);
  color:var(--silver);
  font-family:var(--text);
  font-weight:300;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--cyan);color:var(--ink)}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}

.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:fixed;top:-4rem;left:1rem;z-index:200;background:var(--cyan);color:var(--ink);padding:.5rem 1rem;font-weight:500;transition:top .2s}
.skip:focus{top:1rem;text-decoration:none}

/* ---------------- boot ---------------- */
.boot{
  position:fixed;inset:0;z-index:100;background:var(--ink);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.1rem;
  transition:opacity .5s ease .1s,visibility .5s ease .1s;
}
.boot.done{opacity:0;visibility:hidden}
.boot-word{font-family:var(--disp);font-size:clamp(1.4rem,3.4vw,2.2rem);letter-spacing:.55em;margin-left:.55em;color:var(--silver)}
.boot-bar{width:min(220px,50vw);height:1px;background:var(--line);overflow:hidden}
.boot-bar span{display:block;height:100%;width:100%;background:var(--cyan);transform:translateX(-100%);}
.boot.tick .boot-bar span{transition:transform 1.15s var(--snap);transform:translateX(0)}
.boot-sub{font-size:.6rem;letter-spacing:.34em;color:var(--dim)}

/* ---------------- nav ---------------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:1.1rem clamp(1.2rem,4vw,3rem);
  transition:background .4s,border-color .4s,padding .4s;
  border-bottom:1px solid transparent;
}
.nav.scrolled{background:rgba(8,9,11,.82);backdrop-filter:blur(12px);border-color:var(--line);padding:.75rem clamp(1.2rem,4vw,3rem)}
.nav-mark{font-family:var(--disp);font-size:.95rem;letter-spacing:.3em;color:var(--silver)}
.nav-mark span{color:var(--dim);font-size:.62rem;letter-spacing:.3em}
.nav-mark:hover{text-decoration:none;color:#fff}
.nav nav{display:flex;gap:clamp(1rem,2.6vw,2.2rem);align-items:center}
.nav nav a{font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--dim)}
.nav nav a:hover{color:var(--silver);text-decoration:none}
.nav-cta{
  color:var(--ink)!important;background:var(--cyan);
  padding:.5rem .95rem;font-weight:500;clip-path:polygon(8px 0,100% 0,calc(100% - 8px) 100%,0 100%);
  transition:background .25s;
}
.nav-cta:hover{background:#7fdfff;text-decoration:none}
@media (max-width:640px){.nav nav a:not(.nav-cta){display:none}}

/* ---------------- sculpture stage ---------------- */
.sculpture{position:relative;height:560svh}
.stage{position:sticky;top:0;height:100svh;overflow:hidden}
#gl{position:absolute;inset:0;width:100%;height:100%;display:block}

/* fallback composition (no WebGL / reduced motion) */
.gl-fallback{position:absolute;inset:0;display:none;overflow:hidden;
  background:radial-gradient(120% 90% at 50% 110%, #101820 0%, var(--ink) 62%)}
.fb-streak{position:absolute;left:-10%;right:-10%;height:2px;border-radius:2px;
  background:linear-gradient(90deg,transparent,var(--cyan) 45%,transparent);filter:blur(.5px);opacity:.75}
.fb-s1{top:38%;transform:rotate(-7deg)}
.fb-s2{top:52%;transform:rotate(-4deg);opacity:.35;height:1px}
.fb-s3{top:63%;transform:rotate(-9deg);opacity:.22;height:1px}
.fb-body{position:absolute;left:50%;top:47%;width:min(72vw,760px);aspect-ratio:16/5;transform:translate(-50%,-50%);
  background:
    radial-gradient(58% 120% at 50% 100%, rgba(63,208,255,.20), transparent 70%),
    radial-gradient(46% 82% at 46% 30%, rgba(216,221,227,.14), transparent 72%);
  clip-path:polygon(0 78%,10% 55%,26% 34%,46% 22%,62% 24%,80% 38%,100% 62%,100% 100%,0 100%);
}
.fb-horizon{position:absolute;left:0;right:0;top:70%;height:1px;background:linear-gradient(90deg,transparent,rgba(216,221,227,.28),transparent)}
.no-webgl #gl{display:none}
.no-webgl .gl-fallback{display:block}

/* HUD chapters */
.hud{position:absolute;inset:0;pointer-events:none}
.chapter{
  position:absolute;left:clamp(1.2rem,6vw,5.5rem);bottom:clamp(4.2rem,11vh,7.5rem);
  max-width:34rem;pointer-events:none;
  opacity:0;visibility:hidden;
  transform:translateY(26px) skewY(1.2deg);
  transition:opacity .45s ease,transform .6s var(--snap),visibility .45s;
}
.chapter.ch-active{opacity:1;visibility:visible;transform:none;pointer-events:auto}
.ch-index{font-family:var(--disp);font-size:.62rem;letter-spacing:.42em;color:var(--cyan);margin-bottom:1.1rem}
.ch-title{
  font-family:var(--disp);font-weight:400;color:var(--silver);
  font-size:clamp(1.3rem,4.6vw,3.3rem);line-height:1.16;letter-spacing:.02em;
  text-transform:uppercase;margin-bottom:1.15rem;text-wrap:balance;
}
.hero-title{font-size:clamp(1.6rem,5.6vw,4.1rem)}
.hero-title span{display:inline-block}
.ch-copy{color:var(--dim);font-size:clamp(.88rem,1.15vw,1rem);max-width:30rem}
.ch-cta{margin-top:1.6rem}
.ch-hint{display:flex;align-items:center;gap:.8rem;margin-top:2.1rem;font-size:.62rem;letter-spacing:.3em;text-transform:uppercase;color:var(--dim)}
.hint-line{width:64px;height:1px;background:var(--line);position:relative;overflow:hidden;display:inline-block}
.hint-line::after{content:"";position:absolute;inset:0;background:var(--cyan);transform:translateX(-100%);animation:hint 2.2s var(--snap) infinite}
@keyframes hint{0%{transform:translateX(-100%)}55%{transform:translateX(0)}100%{transform:translateX(102%)}}

/* progress rail */
.rail{
  position:absolute;right:clamp(1rem,3vw,2.4rem);top:50%;transform:translateY(-50%);
  display:flex;flex-direction:column;gap:2rem;align-items:flex-end;
}
.rail-tick{font-family:var(--disp);font-size:.55rem;letter-spacing:.3em;color:var(--dim);opacity:.55;transition:color .3s,opacity .3s}
.rail-tick.on{color:var(--cyan);opacity:1}
.rail-cursor{position:absolute;right:-10px;top:0;width:3px;height:14px;background:var(--cyan);border-radius:2px;
  box-shadow:0 0 12px var(--cyan);transition:top .18s ease-out}
@media (max-width:760px){.rail{display:none}}

.hud-meta{
  position:absolute;left:clamp(1.2rem,6vw,5.5rem);right:clamp(1.2rem,6vw,5.5rem);bottom:1.15rem;
  display:flex;justify-content:space-between;gap:1rem;
  font-size:.58rem;letter-spacing:.3em;color:var(--dim);text-transform:uppercase;
}
@media (max-width:640px){.hud-meta span:last-child{display:none}}

/* static / no-webgl: chapters stack, no scrub */
.static .sculpture,.no-webgl .sculpture{height:auto}
.static .stage,.no-webgl .stage{position:relative;height:auto;min-height:100svh;overflow:visible;padding:26svh 0 4rem}
.static #gl{position:fixed;inset:0;z-index:-1}
.static .chapter,.no-webgl .chapter{
  position:relative;left:auto;bottom:auto;opacity:1;visibility:visible;transform:none;pointer-events:auto;
  margin:0 auto 5.5rem;padding:0 clamp(1.2rem,6vw,5.5rem);max-width:44rem;
}
.static .rail,.no-webgl .rail,.static .hud-meta,.no-webgl .hud-meta,.static .ch-hint,.no-webgl .ch-hint{display:none}
.no-webgl .gl-fallback{position:fixed;z-index:-1}

/* ---------------- buttons ---------------- */
.btn{
  display:inline-block;background:var(--cyan);color:var(--ink);font-family:var(--text);
  font-weight:600;font-size:.78rem;letter-spacing:.18em;text-transform:uppercase;
  padding:.95rem 1.7rem;border:none;cursor:pointer;
  clip-path:polygon(12px 0,100% 0,calc(100% - 12px) 100%,0 100%);
  transition:background .25s,transform .35s var(--snap);
}
.btn:hover{background:#7fdfff;text-decoration:none;transform:translateX(3px)}
.btn:active{transform:translateX(3px) scale(.98)}

/* ---------------- shared section chrome ---------------- */
section{position:relative}
.telemetry,.design,.reserve{
  padding:clamp(5rem,12vh,9rem) clamp(1.2rem,6vw,5.5rem);
  border-top:1px solid var(--line);
  background:var(--ink);
}
.sec-index{font-family:var(--disp);font-size:.62rem;letter-spacing:.42em;color:var(--cyan);margin-bottom:1.1rem}
.sec-title{
  font-family:var(--disp);font-weight:400;text-transform:uppercase;color:var(--silver);
  font-size:clamp(1.25rem,3.8vw,2.9rem);line-height:1.18;letter-spacing:.02em;text-wrap:balance;
}
.sec-sub{color:var(--dim);max-width:36rem;margin-top:1.2rem;font-size:.95rem}
.sec-head{max-width:62rem}

/* reveal choreography (JS adds .in) */
.js .rv{opacity:0;transform:translateY(30px)}
.js .rv.in{opacity:1;transform:none;transition:opacity .5s ease,transform .8s var(--snap)}
.js.static .rv{opacity:1;transform:none;transition:none}

/* ---------------- telemetry ---------------- */
.spec-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);margin-top:3.4rem;
}
.spec{background:var(--ink);padding:1.7rem 1.4rem 1.5rem;transition:background .3s}
.spec:hover{background:var(--ink-2)}
.spec dt{font-size:.62rem;letter-spacing:.28em;text-transform:uppercase;color:var(--dim);margin-bottom:.9rem}
.spec dd{display:flex;align-items:baseline;gap:.45rem}
.count{
  font-family:var(--disp);font-size:clamp(1.5rem,2.6vw,2.2rem);color:var(--silver);
  font-variant-numeric:tabular-nums;letter-spacing:.01em;
}
.spec i{font-style:normal;font-size:.68rem;letter-spacing:.2em;color:var(--cyan)}
.spec-note{margin-top:1.6rem;color:var(--dim);font-size:.85rem}
@media (max-width:1000px){.spec-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:420px){.spec-grid{grid-template-columns:1fr}}

/* ---------------- design ---------------- */
.big-state em{font-style:normal;color:var(--cyan)}
.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(1.6rem,3.5vw,3.2rem);margin-top:4rem}
.principle{border-top:1px solid var(--line);padding-top:1.5rem}
.pr-no{font-family:var(--disp);font-size:.6rem;letter-spacing:.34em;color:var(--cyan);margin-bottom:1rem}
.principle h3{font-family:var(--disp);font-weight:400;font-size:.95rem;letter-spacing:.14em;text-transform:uppercase;margin-bottom:.85rem;color:var(--silver)}
.principle p{color:var(--dim);font-size:.92rem}
@media (max-width:820px){.principles{grid-template-columns:1fr}}

/* ---------------- reserve ---------------- */
.reserve{background:
  radial-gradient(90% 70% at 50% 115%, rgba(63,208,255,.10), transparent 60%),
  var(--ink)}
.reserve-inner{max-width:44rem}
.slot-now{color:var(--cyan)}
.reserve-sub{color:var(--dim);margin-top:1.3rem;font-size:.95rem}
.reserve-form{display:flex;gap:.8rem;margin-top:2.2rem;flex-wrap:wrap}
.reserve-form input{
  flex:1 1 240px;background:var(--ink-2);border:1px solid var(--line);color:var(--silver);
  font-family:var(--text);font-size:.95rem;padding:.95rem 1.1rem;min-width:0;
}
.reserve-form input::placeholder{color:#5c6570}
.reserve-form input:focus{outline:2px solid var(--cyan);outline-offset:0;border-color:transparent}
.reserve-confirm{margin-top:1.2rem;color:var(--cyan);font-size:.92rem;min-height:1.4em}
.reserve-fine{margin-top:.7rem;color:var(--dim);font-size:.78rem}

/* ---------------- footer ---------------- */
.footer{
  border-top:1px solid var(--line);
  padding:2.6rem clamp(1.2rem,6vw,5.5rem) 3rem;
  display:flex;flex-direction:column;gap:.55rem;
  font-size:.8rem;color:var(--dim);
}
.footer nav a{font-size:.8rem}
.footer-fine{font-size:.72rem;color:#6a7480}
.footer-fine a{color:var(--dim)}

/* ---------------- guide ---------------- */
.guide-body{max-width:46rem;margin:0 auto;padding:6.5rem 1.4rem 5rem}
.guide-body .back{display:inline-block;margin-bottom:2.6rem;font-size:.78rem;letter-spacing:.18em;text-transform:uppercase}
.guide-body h1{font-family:var(--disp);font-weight:400;font-size:clamp(1.5rem,4.5vw,2.4rem);line-height:1.2;text-transform:uppercase;letter-spacing:.02em;margin-bottom:1.4rem}
.guide-body h2{font-family:var(--disp);font-weight:400;font-size:1rem;letter-spacing:.1em;text-transform:uppercase;color:var(--cyan);margin:2.8rem 0 .9rem}
.guide-body p,.guide-body li{color:var(--dim);font-size:.95rem}
.guide-body strong{color:var(--silver);font-weight:500}
.guide-body ul,.guide-body ol{padding-left:1.2rem;display:grid;gap:.5rem;margin:.6rem 0}
.guide-body code{font-family:ui-monospace,monospace;font-size:.85em;color:var(--cyan);background:var(--ink-2);padding:.1em .35em;border:1px solid var(--line)}

/* ---------------- 404 ---------------- */
.nf{min-height:100svh;display:grid;place-items:center;text-align:center;padding:2rem;
  background:
    linear-gradient(115deg,transparent 42%,rgba(63,208,255,.14) 49%,transparent 55%),
    radial-gradient(110% 80% at 50% 115%, #101820 0%, var(--ink) 60%)}
.nf-code{font-family:var(--disp);font-size:clamp(4rem,17vw,10rem);color:var(--silver);line-height:1;letter-spacing:.06em}
.nf-code b{color:var(--cyan);font-weight:400}
.nf p{color:var(--dim);margin:1.1rem 0 1.9rem}
.nf .sec-index{margin-bottom:1.4rem}

/* ---------------- reduced motion ---------------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s!important;animation-iteration-count:1!important;transition-duration:.001s!important}
  .boot{display:none}
}