/* ArcanTx — single stylesheet. No third-party fonts or scripts. */
:root{
  /* Light theme (default) */
  --navy:#1D3A5F;
  --bg:#F6F8FA;
  --bg-2:#FFFFFF;
  --panel:#FFFFFF;
  --line:#D3DCE4;
  --teal:#1B7A6E;       /* accent, AA on --bg */
  --teal-deep:#1B7A6E;
  --text:#0D1B2A;
  --muted:#4B5E6F;      /* AA on --bg */
  --on-accent:#FFFFFF;
  --accent-hover:#146357;
  --header-bg:rgba(246,248,250,.86);
  --hero-glow:rgba(27,122,110,.10);
  --spot:rgba(27,122,110,.12);
  --err:#B3261E;
  --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;
  color-scheme:light;
}
:root[data-theme="dark"]{
  --bg:#0D1B2A;
  --bg-2:#112334;
  --panel:#142A3F;
  --line:#23405A;
  --teal:#3AB8A6;
  --teal-deep:#2B8A7D;
  --text:#EEF3F6;
  --muted:#A9B8C5;
  --on-accent:#06121c;
  --accent-hover:#5ccdbc;
  --header-bg:rgba(13,27,42,.82);
  --hero-glow:var(--hero-glow);
  --spot:var(--spot);
  --err:#ff9e95;
  color-scheme:dark;
}
*{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:var(--on-accent);padding:.6rem 1rem;z-index:100}
.skip:focus{left:0}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:var(--header-bg);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}
/* Logo variants: original-color mark on light, recolored mark on dark */
.logo-dark{display:none!important}
:root[data-theme="dark"] .logo-dark{display:block!important}
:root[data-theme="dark"] .logo-light{display:none!important}
.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)}
.header-tools{display:flex;align-items:center;gap:1.25rem}
.theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--line);border-radius:8px;background:transparent;color:var(--text);cursor:pointer;transition:border-color .2s,color .2s}
.theme-toggle:hover{border-color:var(--teal);color:var(--teal)}
.theme-toggle svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.theme-toggle .i-sun{display:none}
:root[data-theme="dark"] .theme-toggle .i-sun{display:block}
:root[data-theme="dark"] .theme-toggle .i-moon{display:none}

/* 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:var(--on-accent)}
.btn.primary:hover{background:var(--accent-hover)}
.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%,var(--hero-glow),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:var(--err)}
.err{color:var(--err);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:var(--err)}
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 */


@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}
}

/* ---- Specialty refocus (SDD-SITE-002) ---- */
h4{font:500 .78rem/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--teal);margin:1.6rem 0 .8rem}
.sub{margin:3.5rem 0 1.5rem}
.comps{display:grid;gap:clamp(2.5rem,6vw,4.5rem);margin-top:3rem}
.comp{display:grid;gap:1.75rem;align-items:center;scroll-margin-top:90px}
.comp-art{background:linear-gradient(135deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;color:var(--teal)}
.diagram{display:block;width:100%;height:auto;max-height:260px}
.diagram .fill{fill:currentColor}.diagram .x{stroke:var(--err)}.diagram .gap{stroke:var(--bg-2)}
.comp-body .idx,.steps .idx{font:500 .8rem var(--mono);color:var(--teal)}
.comp-body h3{font-size:1.5rem;margin:.4rem 0 .8rem}
.comp-body p{margin:0 0 1rem;color:var(--muted)}
.tags{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.5rem}
.tags li{font:500 .78rem var(--mono);border:1px solid var(--line);padding:.35rem .7rem;border-radius:999px;color:var(--muted)}
.get{margin:0;padding:0;list-style:none;display:grid;gap:.5rem}
.get li{position:relative;padding-left:1.4rem;color:var(--text);font-size:1rem}
.get li::before{content:"";position:absolute;left:0;top:.7em;width:.7rem;height:2px;background:var(--teal)}
.offer{margin:1.2rem 0 0!important;color:var(--teal)!important;font:500 .95rem var(--mono)}
.cards.two{grid-template-columns:1fr}
.case .outcome{font:600 clamp(1.4rem,3vw,1.9rem)/1.2 var(--sans);letter-spacing:-.02em;margin:0 0 .6rem;color:var(--text)}
.case h3{color:var(--teal);font-size:1rem;font-family:var(--mono);font-weight:500;margin-bottom:1rem}
.case ul{margin:0;padding-left:1.1rem;color:var(--muted)}
.steps{list-style:none;margin:2.5rem 0;padding:0;display:grid;gap:1.25rem;counter-reset:s}
.steps li{border-top:2px solid var(--teal-deep);padding-top:1rem}
.steps h3{margin:.4rem 0 .5rem;font-size:1.1rem}.steps p{margin:0;color:var(--muted);font-size:1rem}
.pillars{display:grid;gap:1.25rem;padding:1.75rem;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius)}
.pillars h3{font-size:1rem;margin-bottom:.3rem}.pillars p{margin:0;color:var(--muted);font-size:.95rem}
.link{display:inline-block;margin-top:1rem;font-weight:600;text-decoration:none}.link:hover{text-decoration:underline}
.aside{border-left:3px solid var(--teal);padding-left:1rem;margin-top:1.75rem!important}
.contact-list{list-style:none;padding:0;margin:1.75rem 0 0;display:grid;gap:.8rem}
.contact-list span{display:block;font:500 .78rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
@media(min-width:760px){
  .comp{grid-template-columns:5fr 7fr;gap:3rem}
  .comp.flip .comp-art{order:2}
  .cards.two{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(4,1fr)}
  .pillars{grid-template-columns:repeat(4,1fr)}
}
@media(max-width:620px){.site-header nav a:nth-child(2),.site-header nav a:nth-child(3){display:none}}

/* ---- Purpose + motion (SDD-SITE-003) ---- */
/* Content is visible by default; hidden-until-revealed states only apply when JS runs and motion is allowed. */
.progress{position:fixed;inset:0 0 auto 0;height:3px;background:var(--teal);transform:scaleX(0);transform-origin:0 50%;z-index:60;will-change:transform}
.site-header nav a.active{color:var(--text);box-shadow:0 2px 0 var(--teal)}
.tagline{font-size:clamp(2.2rem,6vw,4.2rem);max-width:18ch;margin-bottom:3rem;letter-spacing:-.03em;
  background:linear-gradient(100deg,var(--text) 30%,var(--teal) 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.statements{display:grid;gap:3rem;margin-bottom:4rem}
.label{font:500 .8rem/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--teal);margin:0 0 1.1rem}
.vision{font-size:clamp(1.3rem,2.6vw,1.8rem);line-height:1.4;margin:0;max-width:34ch;letter-spacing:-.01em}
.mission{font-size:clamp(1.3rem,2.6vw,1.8rem);line-height:1.45;margin:0;max-width:46ch;letter-spacing:-.01em}
.mission .mw{transition:opacity .25s linear}
.values{display:grid;gap:1.25rem;margin-top:1.5rem}
.value .idx{font:500 .8rem var(--mono);color:var(--teal);display:block;margin-bottom:1rem}
.value h3{margin-bottom:.6rem}.value p{margin:0;color:var(--muted);font-size:1rem}

/* pointer spotlight on cards (hover-capable devices only) */
.spot{position:relative;overflow:hidden}
@media(hover:hover) and (pointer:fine){
  .spot::after{content:"";position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .3s;
    background:radial-gradient(360px circle at var(--mx,50%) var(--my,50%),var(--spot),transparent 60%)}
  .spot:hover::after{opacity:1}
}

@media(prefers-reduced-motion:no-preference){
  /* hero entrance */
  .hero-stagger>*{animation:rise .8s cubic-bezier(.2,.7,.2,1) both;animation-delay:calc(var(--i,0)*110ms + 100ms)}
  @keyframes rise{from{opacity:0;transform:translate3d(0,22px,0)}to{opacity:1;transform:none}}
  .waves{transition:transform .1s linear;transform:translate3d(0,calc(var(--py,0)*-1px),0);will-change:transform}
  /* scroll reveal + stagger (only when JS is running) */
  .js .reveal{opacity:0;transform:translate3d(0,24px,0);transition:opacity .8s ease,transform .8s cubic-bezier(.2,.7,.2,1)}
  .js .reveal.in{opacity:1;transform:none}
  .js .stagger>*{opacity:0;transform:translate3d(0,20px,0);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1);transition-delay:calc(var(--i,0)*90ms)}
  .js .in .stagger>*,.js .stagger.in>*{opacity:1;transform:none}
  /* diagrams draw themselves */
  .js .diagram g>*{stroke-dasharray:var(--len,400);stroke-dashoffset:var(--len,400);transition:stroke-dashoffset 1.6s ease .15s}
  .js .comp.in .diagram g>*{stroke-dashoffset:0}
  .js .diagram .fill{fill-opacity:0;transition:fill-opacity .6s ease 1.2s}
  .js .comp.in .diagram .fill{fill-opacity:1}
  /* mission words dim until lit by scroll */
  .js .mission .mw{opacity:.25}.js .mission .mw.lit{opacity:1}
  .card,.btn{will-change:transform}
}
@media(prefers-reduced-motion:reduce){.progress{display:none}}
@media(min-width:760px){
  .statements{grid-template-columns:1fr 1.2fr;gap:4rem}
  .values{grid-template-columns:repeat(3,1fr)}
}

/* ---- Peer-review response (SRS-SITE-004) ---- */
h1{max-width:22ch}
.bridge{margin-top:-1.5rem;margin-bottom:3.5rem}
.delivered,.status-line{margin:1rem 0 0;font-size:.95rem;color:var(--muted)}
.delivered span,.status-line span{display:inline-block;min-width:5.5rem;font:500 .75rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--teal)}
.fit{display:grid;gap:2rem;margin-top:2rem}
.fit-col{padding:1.75rem;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius)}
.no{margin:0;padding:0;list-style:none;display:grid;gap:.5rem}
.no li{position:relative;padding-left:1.4rem;color:var(--muted);font-size:1rem}
.no li::before{content:"";position:absolute;left:0;top:.7em;width:.7rem;height:2px;background:var(--muted);transform:rotate(-45deg)}
.no li::after{content:"";position:absolute;left:0;top:.7em;width:.7rem;height:2px;background:var(--muted);transform:rotate(45deg)}
.faq{margin:0;display:grid;gap:1rem}
.faq div{border-top:1px solid var(--line);padding-top:1rem}
.faq dt{font-weight:600;margin-bottom:.3rem}.faq dd{margin:0;color:var(--muted);font-size:1rem}
select{width:100%;font:inherit;color:var(--text);background:var(--bg-2);border:1px solid var(--line);border-radius:8px;padding:.8rem 1rem}
select:focus{outline:2px solid var(--teal);outline-offset:0;border-color:var(--teal)}
.opt{text-transform:none;letter-spacing:0;color:var(--muted)}
.field.check{grid-template-columns:auto 1fr;align-items:start;gap:.7rem}
.field.check input{width:1.1rem;height:1.1rem;margin-top:.15rem;accent-color:var(--teal)}
.field.check label{font:inherit;font-size:.95rem;letter-spacing:0;color:var(--text)}
@media(min-width:760px){.fit{grid-template-columns:1fr 1fr}.faq{grid-template-columns:1fr 1fr;gap:1rem 3rem}}
@media(max-width:620px){.site-header nav a:nth-child(2),.site-header nav a:nth-child(3){display:inline}.site-header nav a:nth-child(2),.site-header nav a:nth-child(4){display:none}}
.brand{flex-shrink:0}.brand img{max-width:none}
@media(max-width:480px){.site-header nav{gap:.8rem;font-size:.9rem}}
@media(max-width:480px){.site-header nav a:nth-child(5){display:none}}
@media(max-width:360px){.site-header nav a:nth-child(3){display:none}}
/* Narrow phones: keep the theme toggle on-screen by showing only the Contact link */
@media(max-width:480px){.site-header nav a{display:none}.site-header nav a[href="#contact"]{display:inline}.header-tools{gap:.75rem}}