*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
}
body{margin:0;padding-top:40px;font-family:var(--font-body);color:var(--ink);background:#F2F6FF;line-height:1.55;-webkit-font-smoothing:antialiased;}
h1,h2,h3{font-family:var(--font-display);font-weight:700;margin:0 0 .4em;line-height:1.08;}
p{margin:0 0 1em;color:var(--ink-soft);}
a{color:inherit;}
button{font-family:var(--font-body);cursor:pointer;border:none;background:none;color:inherit;}
ul{margin:0;}
.hidden{display:none !important;}
:focus-visible{outline:3px solid var(--sky);outline-offset:2px;}

/* ---------- Prototype ribbon ---------- */
.proto-ribbon{position:fixed;top:0;left:0;right:0;height:40px;background:var(--ink);color:var(--paper);display:flex;align-items:center;justify-content:center;gap:1.4em;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.02em;z-index:100;padding:0 1em;text-align:center;}
.proto-ribbon b{color:var(--paper);font-weight:500;}
.proto-ribbon .sep{opacity:.4;}
.proto-ribbon button{color:#A7C5FD;text-decoration:underline;font-family:var(--font-mono);font-size:.74rem;white-space:nowrap;}
@media (max-width:640px){.proto-ribbon{font-size:.66rem;gap:.7em;}}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}