/* ArcanTx — single stylesheet. No third-party fonts or scripts. */
:root{
  --navy:#1D3A5F;
  --bg:#0D1B2A;
  --bg-2:#112334;
  --panel:#142A3F;
  --line:#23405A;
  --teal:#3AB8A6;       /* accent, AA on --bg */
  --teal-deep:#2B8A7D;
  --text:#EEF3F6;
  --muted:#A9B8C5;      /* AA on --bg */
  --radius:10px;
  --sans:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--text);font:400 1.0625rem/1.65 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;height:auto}
a{color:var(--teal)}
:focus-visible{outline:2px solid var(--teal);outline-offset:3px;border-radius:4px}
.wrap{width:min(1120px,100% - 2.5rem);margin-inline:auto}
.skip{position:absolute;left:-999px;top:0;background:var(--teal);color:#06121c;padding:.6rem 1rem;z-index:100}
.skip:focus{left:0}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(13,27,42,.82);backdrop-filter:blur(10px);border-bottom:1px solid transparent;transition:border-color .3s}
.site-header .bar{display:flex;align-items:center;justify-content:space-between;height:84px;transition:height .3s}
.site-header.condensed{border-color:var(--line)}
.site-header.condensed .bar{height:60px}
.brand img{display:block;height:38px;width:auto;transition:height .3s}
.condensed .brand img{height:30px}
.site-header nav{display:flex;gap:1.75rem}
.site-header nav a,.foot nav a{color:var(--muted);text-decoration:none;font-size:.95rem}
.site-header nav a:hover,.foot nav a:hover{color:var(--text)}

/* Type */
.eyebrow{font:500 .78rem/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--teal);margin:0 0 1.1rem}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em;margin:0}
h1{font-size:clamp(2.3rem,6vw,4.1rem);font-weight:650;max-width:16ch}
h2{font-size:clamp(1.7rem,3.5vw,2.4rem);font-weight:620}
h3{font-size:1.2rem;font-weight:600;letter-spacing:-.01em}
.lede{font-size:clamp(1.1rem,2vw,1.3rem);color:var(--muted);max-width:56ch;margin:1.5rem 0 2.2rem}
.muted{color:var(--muted)}

/* Buttons */
.actions{display:flex;flex-wrap:wrap;gap:.9rem}
.btn{display:inline-block;font:600 1rem var(--sans);padding:.85rem 1.5rem;border-radius:8px;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:background .2s,border-color .2s,transform .2s}
.btn.primary{background:var(--teal);color:#06121c}
.btn.primary:hover{background:#5ccdbc}
.btn.ghost{border-color:var(--line);color:var(--text)}
.btn.ghost:hover{border-color:var(--teal);color:var(--teal)}

/* Hero */
.hero{position:relative;padding:clamp(4rem,12vw,9rem) 0 clamp(4rem,10vw,7rem);overflow:hidden;background:radial-gradient(ellipse at 80% 0%,rgba(43,138,125,.14),transparent 55%)}
.hero-inner{position:relative;z-index:1}
.waves{position:absolute;right:-6%;top:-8%;width:min(640px,80vw);color:var(--teal);opacity:.35;pointer-events:none}
.w{stroke-dasharray:6 10;animation:pulse 5s ease-in-out infinite}
.w2{animation-delay:.4s}.w3{animation-delay:.8s}.w4{animation-delay:1.2s}
@keyframes pulse{0%,100%{opacity:.25}50%{opacity:1}}

/* Sections */
.section{padding:clamp(3.5rem,8vw,6rem) 0;border-top:1px solid var(--line)}
.split{display:grid;gap:2.5rem}
.prose p{margin:0 0 1.1rem;color:var(--muted)}
.prose p:first-child{color:var(--text)}

.feature{margin-top:.5rem;display:grid;gap:2rem;padding:clamp(1.5rem,4vw,3rem);background:linear-gradient(135deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-left:3px solid var(--teal);border-radius:var(--radius)}
.feature h2{margin-bottom:1rem}
.big{font-size:1.2rem;max-width:52ch;margin:0 0 1.8rem;color:var(--muted)}
.tags{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.6rem;align-content:flex-start}
.tags li{font:500 .8rem var(--mono);border:1px solid var(--line);padding:.4rem .75rem;border-radius:999px;color:var(--muted)}

.cards{display:grid;gap:1.25rem;margin-top:2.5rem}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.75rem;transition:border-color .2s,transform .2s}
.card:hover{border-color:var(--teal-deep);transform:translateY(-2px)}
.card .idx{font:500 .8rem var(--mono);color:var(--teal);display:block;margin-bottom:1.2rem}
.card h3{margin-bottom:.7rem}
.card p{margin:0;color:var(--muted);font-size:1rem}

/* Form */
form{display:grid;gap:1.1rem}
.field{display:grid;gap:.4rem}
label{font:500 .85rem var(--mono);letter-spacing:.04em;color:var(--muted)}
input,textarea{width:100%;font:inherit;color:var(--text);background:var(--bg-2);border:1px solid var(--line);border-radius:8px;padding:.8rem 1rem}
input:focus,textarea:focus{outline:2px solid var(--teal);outline-offset:0;border-color:var(--teal)}
input[aria-invalid="true"],textarea[aria-invalid="true"]{border-color:#ff8a80}
.err{color:#ff9e95;font-size:.88rem;min-height:0}
.hp{position:absolute;left:-9999px;height:0;overflow:hidden}
form .btn{justify-self:start}
.status{margin:0;min-height:1.5em}
.status.ok{color:var(--teal)}.status.bad{color:#ff9e95}
button[disabled]{opacity:.6;cursor:wait}

/* Footer */
.site-footer{border-top:1px solid var(--line);padding:2rem 0;font-size:.92rem;color:var(--muted)}
.foot{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between}
.foot p{margin:0}.foot nav{display:flex;gap:1.5rem}

/* Scroll reveal */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s ease}
.js .reveal.in{opacity:1;transform:none}

@media(min-width:760px){
  .split{grid-template-columns:5fr 6fr;gap:4rem}
  .feature{grid-template-columns:3fr 1.2fr}
  .cards{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:480px){.site-header nav{gap:1rem}.brand img{height:30px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .w{animation:none;opacity:.6}
  .js .reveal{opacity:1;transform:none;transition:none}
  *{transition-duration:.01ms!important}
}