/* Science for Normies: shared base styles. Load after tokens.css. */
@view-transition{navigation:auto}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--void);color:var(--text);font-family:var(--read);font-size:var(--step-0);line-height:1.65;-webkit-font-smoothing:antialiased}
img,svg,canvas,video{max-width:100%}
a{color:var(--teal)}
:focus-visible{outline:2px solid var(--teal);outline-offset:3px;border-radius:6px}
h1,h2,h3{font-family:var(--display);line-height:1.08;margin:0;text-wrap:balance}
h1{font-size:var(--step-4);font-weight:800;letter-spacing:-.03em}
h2{font-size:var(--step-3);font-weight:800;letter-spacing:-.02em}
h3{font-size:var(--step-1);font-weight:600}
p{margin:0}
.wrap{max-width:1120px;margin:0 auto;padding-inline:20px}
.read{max-width:64ch}
.stack{display:flex;flex-direction:column;gap:1rem}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.dim{color:var(--dim)}

/* Interstellar-style wide caps */
.eyebrow{font-family:var(--display);font-weight:600;font-size:.74rem;letter-spacing:var(--wide);text-transform:uppercase;color:var(--teal)}
.mono{font-family:var(--mono)}

/* site header */
.site-head{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:rgba(13,10,17,.72);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:12px}
.logo{font-family:var(--display);font-weight:600;font-size:.82rem;letter-spacing:var(--wide);text-transform:uppercase;color:var(--text);text-decoration:none;white-space:nowrap;view-transition-name:site-logo}
.logo b{font-weight:800;color:var(--teal)}
.site-nav{display:flex;gap:18px;font-family:var(--display);font-size:.88rem}
.site-nav a{color:var(--dim);text-decoration:none}
.site-nav a:hover{color:var(--text)}
@media (max-width:560px){.site-nav{display:none}}

/* buttons + chips */
.btn{font-family:var(--display);font-weight:600;font-size:.92rem;border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:999px;padding:10px 18px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:8px;transition:border-color var(--t-tap) var(--e-out),transform var(--t-tap) var(--e-out),background var(--t-tap)}
.btn:hover{border-color:var(--teal)}
.btn:active{transform:scale(.97)}
.btn.primary{background:var(--teal);color:var(--void);border-color:var(--teal)}
.btn.primary:hover{background:var(--teal-glow)}
.btn[aria-pressed="true"]{border-color:var(--teal);color:var(--teal)}
.chip{font-family:var(--mono);font-size:.7rem;border:1px solid var(--line);border-radius:999px;padding:3px 9px;color:var(--dim);white-space:nowrap}
.chip.lvl{color:var(--ok);border-color:rgba(166,220,192,.4)}

section{padding-block:clamp(56px,9vw,110px);border-top:1px solid var(--line)}
.site-foot{padding-block:44px;border-top:1px solid var(--line);font-size:.85rem;color:var(--dim)}
.site-foot .wrap{display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between}

/* reveal-on-scroll (progressive: content is visible without JS) */
@supports (animation-timeline: view()){
  @media (prefers-reduced-motion: no-preference){
    .reveal{animation:sfn-rise linear both;animation-timeline:view();animation-range:entry 0% entry 40%}
    @keyframes sfn-rise{from{opacity:.001;transform:translateY(24px)}to{opacity:1;transform:none}}
  }
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  ::view-transition-group(*),::view-transition-old(*),::view-transition-new(*){animation:none!important}
}