/* System Architect lander family: one-pager landing plus satellite pages. */
:root{
  --paper:#faf8f4; --card:#ffffff; --ink:#1d1a16; --ink-soft:#5c564d;
  --line:#e7e1d7; --accent:#2e5d4b; --accent-ink:#ffffff; --accent-soft:#e9f0ec;
  --gold:#a07c3f; --radius:14px;
  --shadow:0 1px 2px rgba(29,26,22,.06), 0 8px 28px rgba(29,26,22,.07);
  --font-body:'Inter',-apple-system,system-ui,sans-serif;
  --font-display:'Fraunces',Georgia,serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-body);line-height:1.6;overflow-x:hidden}
a{color:var(--accent)}
.wrap{max-width:960px;margin:0 auto;padding:0 24px}
.narrow{max-width:680px;margin:0 auto}

/* atmosphere: quiet paper depth, no dark theatrics */
.atmo{position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(ellipse 70% 50% at 80% 0%, rgba(46,93,75,.07) 0%, transparent 55%),
    radial-gradient(ellipse 60% 60% at 5% 100%, rgba(160,124,63,.06) 0%, transparent 55%),
    var(--paper);}

/* fixed nav */
.topnav{position:fixed;top:0;left:0;right:0;z-index:40;
  background:rgba(250,248,244,.82);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line)}
.topnav .bar{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-family:var(--font-display);font-size:1.25rem;font-weight:700;color:var(--ink);text-decoration:none}
.brand em{color:var(--accent);font-style:normal}
.btn{display:inline-block;font:inherit;font-weight:600;padding:12px 26px;border:0;border-radius:999px;
  background:var(--accent);color:var(--accent-ink);cursor:pointer;text-decoration:none}
.btn:hover{filter:brightness(1.08)}
.btn.small{padding:8px 20px;font-size:.9rem}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--accent);background:var(--accent-soft);filter:none}

/* full-viewport hero */
.hero-full{min-height:100svh;display:flex;flex-direction:column;justify-content:center;
  position:relative;padding-top:64px;text-align:center}
.kicker{color:var(--accent);font-size:.78rem;font-weight:600;letter-spacing:.28em;text-transform:uppercase;margin:0 0 22px}
h1{font-family:var(--font-display);font-weight:500;font-size:clamp(2.4rem,6.5vw,4.3rem);
  line-height:1.08;letter-spacing:-.015em;margin:0 0 22px}
h1 em{color:var(--accent);font-style:italic}
.lede{font-size:clamp(1.05rem,2vw,1.3rem);color:var(--ink-soft);max-width:560px;margin:0 auto 34px}
.cta-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.subnote{font-size:.9rem;color:var(--ink-soft);margin-top:18px}

/* load-in reveals */
.reveal{opacity:0;transform:translateY(26px);animation:revealUp .8s cubic-bezier(.16,1,.3,1) forwards}
.reveal.d1{animation-delay:.1s}.reveal.d2{animation-delay:.22s}
.reveal.d3{animation-delay:.34s}.reveal.d4{animation-delay:.46s}
@keyframes revealUp{to{opacity:1;transform:translateY(0)}}

/* scroll cue */
.scrolldown{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);
  color:var(--ink-soft);font-size:.75rem;letter-spacing:.2em;text-transform:uppercase;
  text-decoration:none;display:flex;flex-direction:column;align-items:center;gap:6px;
  animation:cuePulse 2.2s ease-in-out infinite}
.scrolldown svg{width:18px;height:18px;stroke:var(--accent)}
@keyframes cuePulse{0%,100%{opacity:.55;transform:translateX(-50%) translateY(0)}
  50%{opacity:1;transform:translateX(-50%) translateY(6px)}}

/* scroll sections */
.band{padding:104px 0}
.band.tint{background:linear-gradient(180deg,transparent,rgba(46,93,75,.045),transparent)}
h2{font-family:var(--font-display);font-weight:600;font-size:clamp(1.7rem,3.5vw,2.3rem);
  letter-spacing:-.01em;text-align:center;margin:0 0 14px}
.band > .wrap > p.center, p.center{text-align:center;color:var(--ink-soft);max-width:560px;margin:0 auto 40px}
.sreveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s cubic-bezier(.16,1,.3,1)}
.sreveal.in{opacity:1;transform:translateY(0)}

/* step + point cards */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:760px){.grid3{grid-template-columns:1fr}}
.stepcard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:26px;text-align:left}
.stepcard .n{width:34px;height:34px;border-radius:50%;background:var(--accent);color:var(--accent-ink);
  font-weight:600;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.stepcard b{display:block;font-size:1.05rem;margin-bottom:6px}
.stepcard p{margin:0;color:var(--ink-soft);font-size:.95rem}
.aside-link{text-align:center;margin-top:36px;font-size:.95rem;color:var(--ink-soft)}

/* signup card + forms (shared with satellite pages) */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px}
form{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
input[type=email],input[type=text]{flex:1 1 220px;font:inherit;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--paper);color:var(--ink)}
input:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
button{font:inherit;font-weight:600;padding:12px 22px;border:0;border-radius:10px;background:var(--accent);color:var(--accent-ink);cursor:pointer}
button:hover{filter:brightness(1.08)}
.msg{flex-basis:100%;font-size:.9rem;min-height:1.2em;margin:2px 0 0}
.msg.ok{color:var(--accent)} .msg.err{color:#a03f3f}
.quiet{border-top:1px solid var(--line);margin-top:20px;padding-top:20px}
.quiet summary{cursor:pointer;color:var(--ink-soft);font-size:.95rem}
footer{border-top:1px solid var(--line);padding:28px 0 40px;font-size:.9rem;color:var(--ink-soft);text-align:center}

/* satellite pages (palisades, under-the-hood) */
header.simple{padding:92px 0 0}
.badge{display:inline-block;background:var(--accent-soft);color:var(--accent);font-weight:600;font-size:.8rem;letter-spacing:.04em;text-transform:uppercase;border-radius:999px;padding:4px 14px;margin-bottom:20px}
.hero{padding:48px 0 8px}
.hero h1{font-size:clamp(2rem,5vw,2.9rem);text-align:left}
.hero .lede{margin:0 0 8px;max-width:none;text-align:left}
section{padding:32px 0}
p{color:var(--ink-soft)}
p strong{color:var(--ink)}
.points{list-style:none;margin:24px 0 0;padding:0;text-align:left}
.points li{position:relative;padding:0 0 12px 30px;color:var(--ink-soft)}
.points li::before{content:'';position:absolute;left:2px;top:9px;width:9px;height:9px;border-radius:50%;background:var(--accent)}
.points b{color:var(--ink)}
.navrow{display:flex;gap:10px;flex-wrap:wrap;margin:28px 0 4px}
.navrow a{display:inline-block;border:1px solid var(--line);background:var(--card);border-radius:999px;padding:8px 18px;text-decoration:none;font-weight:600;font-size:.95rem}
.navrow a:hover{border-color:var(--accent);background:var(--accent-soft)}
.oneline{font-size:.95rem}
.back{font-size:.95rem;display:inline-block;margin-top:8px}

/* ---- dark tech pages (under the hood) ------------------------------- */
body.dark{
  --paper:#151816; --card:#1c211e; --ink:#ece7dd; --ink-soft:#a8a195;
  --line:#2c342f; --accent:#7bb99d; --accent-ink:#10231b; --accent-soft:#22352c;
  --gold:#c9a76a;
  --shadow:0 1px 2px rgba(0,0,0,.35), 0 10px 32px rgba(0,0,0,.35);
  --font-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}
body.dark .atmo{background:
  radial-gradient(ellipse 70% 50% at 80% 0%, rgba(123,185,157,.09) 0%, transparent 55%),
  radial-gradient(ellipse 60% 60% at 5% 100%, rgba(201,167,106,.05) 0%, transparent 55%),
  var(--paper)}
body.dark .topnav{background:rgba(21,24,22,.82)}
body.dark input[type=email],body.dark input[type=text]{background:#151816}
body.dark .navrow a{background:var(--card)}
.mono{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}

/* spec cards */
.specgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:36px}
@media(max-width:820px){.specgrid{grid-template-columns:1fr}}
.spec{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow)}
.spec .mono{display:block;margin-bottom:10px}
.spec b{display:block;font-size:1.02rem;margin-bottom:6px;color:var(--ink)}
.spec p{margin:0;font-size:.92rem;color:var(--ink-soft)}

/* data-plane strip */
.stack{display:flex;align-items:stretch;gap:0;flex-wrap:wrap;justify-content:center;
  margin:40px 0 8px;font-family:var(--font-mono);font-size:.78rem}
.stack .node{border:1px solid var(--line);background:var(--card);border-radius:10px;
  padding:12px 16px;text-align:center;color:var(--ink)}
.stack .node small{display:block;color:var(--ink-soft);font-size:.68rem;margin-top:3px;letter-spacing:.05em}
.stack .arrow{display:flex;align-items:center;padding:0 10px;color:var(--accent);font-size:1rem}
@media(max-width:640px){.stack{flex-direction:column;align-items:center}
  .stack .arrow{transform:rotate(90deg);padding:6px 0}}

/* stat chips */
.chips{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin:26px 0 0}
.chip{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.08em;color:var(--ink);
  border:1px solid var(--line);background:var(--card);border-radius:999px;padding:7px 15px}
.chip b{color:var(--accent)}

/* dark teaser band on the lander */
.band.dark-teaser{background:linear-gradient(135deg,#151816,#1b211d);color:#ece7dd;
  border-top:1px solid #2c342f;border-bottom:1px solid #2c342f}
.band.dark-teaser h2{color:#ece7dd;margin-bottom:10px}
.band.dark-teaser p.center{color:#a8a195}
.band.dark-teaser .mono{display:block;text-align:center;color:#7bb99d;margin-bottom:14px}
.band.dark-teaser .cta-row{margin-top:26px}
.band.dark-teaser .btn{background:#7bb99d;color:#10231b}
.modest{text-align:center;font-size:.92rem;color:var(--ink-soft);margin-top:26px}

/* palisades flare */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:30px}
@media(max-width:700px){.grid2{grid-template-columns:1fr}}
.callout{border-left:4px solid var(--gold);background:var(--card);border-radius:0 var(--radius) var(--radius) 0;
  box-shadow:var(--shadow);padding:22px 24px;margin-top:34px}
.callout b{color:var(--ink)}
.callout p{margin:6px 0 0;color:var(--ink-soft)}