/* =========================================================================
   ATOROS — The System of Action
   Direction 2a "Signal Dark" · Archivo + Space Mono · dark-blue theme
   ========================================================================= */

:root{
  /* palette — Dark blue */
  --bg:#0a0f1e;
  --fg:#eaf0fb;
  --muted:#9aa7bf;
  --muted2:#63708c;
  --card:#121a30;
  --accent:#4f8dff;
  --accent-fg:#04101f;
  --line:rgba(255,255,255,.11);
  --line-strong:rgba(255,255,255,.42);

  /* type */
  --display:'Archivo',system-ui,sans-serif;
  --body:'Archivo',system-ui,sans-serif;
  --mono:'Space Mono',ui-monospace,Menlo,monospace;

  --r:0px;
  --maxw:1200px;
  --pad:56px;
  --nav-h:73px;
}

*{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  background-color:var(--bg);
  background-image:
    linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);
  background-size:48px 48px;
  color:var(--fg);
  font-family:var(--body);
  font-synthesis:none;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

img{max-width:100%;display:block}

a{color:inherit}

::selection{background:var(--accent);color:var(--accent-fg)}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--accent);color:var(--accent-fg);
  padding:12px 18px;font-weight:700;font-size:14px;
}
.skip-link:focus{left:12px;top:12px}

:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ---------- shared inner width helper ---------- */
.nav-inner,.hero,.section,.foot{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--pad);
}

/* ============================ NAV ============================ */
.nav{
  position:sticky;top:0;z-index:100;
  border-bottom:1px solid var(--line);
  background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding-block:24px;
}
.brand{
  display:flex;align-items:center;gap:11px;
  font-family:var(--display);font-weight:800;font-size:19px;
  letter-spacing:.14em;color:var(--fg);text-decoration:none;
}
.brand i{width:13px;height:13px;background:var(--accent);display:inline-block;border-radius:2px}

.navlinks{display:flex;align-items:center;gap:30px;font-size:13.5px;color:var(--muted)}
.navlinks a{color:var(--muted);text-decoration:none;transition:color .15s ease}
.navlinks a:hover{color:var(--fg)}
.navlinks a.btn{color:var(--accent-fg)}

.btn{
  display:inline-flex;align-items:center;gap:9px;
  background:var(--accent);color:var(--accent-fg);
  font-family:var(--body);font-weight:700;font-size:14px;
  padding:12px 20px;border:none;border-radius:var(--r);
  cursor:pointer;text-decoration:none;
  transition:transform .15s ease,filter .15s ease;
}
.btn:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn.sm{padding:10px 17px;font-size:13px}
.arrowg{font-family:var(--mono)}

/* hamburger */
.nav-toggle{
  display:none;flex-direction:column;gap:5px;
  background:none;border:1px solid var(--line-strong);
  padding:10px 9px;cursor:pointer;border-radius:2px;
}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--fg);transition:transform .2s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ============================ HERO ============================ */
.hero{
  padding-top:96px;padding-bottom:76px;position:relative;
  background:radial-gradient(720px 340px at 16% 4%,color-mix(in srgb,var(--accent) 14%,transparent),transparent 66%);
  background-repeat:no-repeat;
}
.kicker{
  font-family:var(--mono);font-size:12px;letter-spacing:.3em;
  text-transform:uppercase;color:var(--accent);margin:0 0 26px;
}
.display{
  font-family:var(--display);font-weight:800;
  font-size:clamp(40px,7.4vw,70px);line-height:.98;letter-spacing:-.035em;
  margin:0 0 28px;max-width:17ch;color:var(--fg);
}
.lede{
  font-size:clamp(16px,2vw,19px);line-height:1.62;color:var(--muted);
  max-width:54ch;margin:0 0 38px;
}
.ghost{
  font-size:14px;font-weight:500;color:var(--fg);text-decoration:none;
  border-bottom:1px solid var(--line-strong);padding-bottom:3px;
  transition:border-color .15s ease;
}
.ghost:hover{border-color:var(--accent)}
.flow{display:flex;align-items:center;gap:12px;margin-top:60px;flex-wrap:wrap}
.chip{
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  padding:9px 15px;border:1.5px solid var(--line-strong);border-radius:100px;color:var(--fg);
}
.flow b{color:var(--accent);font-family:var(--mono);font-size:15px}

/* ============================ SECTIONS ============================ */
.section{
  padding-block:84px;border-top:1px solid var(--line);
  scroll-margin-top:var(--nav-h);
}
.eyebrow{
  font-family:var(--mono);font-size:12px;letter-spacing:.26em;
  text-transform:uppercase;color:var(--muted2);margin:0 0 20px;
}
.h2{
  font-family:var(--display);font-weight:800;
  font-size:clamp(30px,4.4vw,42px);line-height:1.08;letter-spacing:-.03em;
  margin:0 0 20px;max-width:20ch;color:var(--fg);
}
.section-lede{
  font-size:clamp(15px,1.9vw,17px);line-height:1.62;color:var(--muted);
  max-width:62ch;margin:0;
}
.section-lede em{color:var(--accent);font-style:normal;font-weight:700}

/* --- 3-card grid --- */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:50px}
.card{border:1px solid var(--line);border-radius:var(--r);padding:28px;background:var(--card)}
.card .n{font-family:var(--mono);color:var(--accent);font-size:13px;margin-bottom:18px;letter-spacing:.06em}
.card h3{font-family:var(--display);font-weight:700;font-size:19px;margin:0 0 11px;color:var(--fg)}
.card p{font-size:14.5px;line-height:1.6;color:var(--muted);margin:0}

/* --- 3-stage loop --- */
.stage{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:stretch;margin-top:52px}
.node{border:1px solid var(--line);border-radius:var(--r);padding:26px;background:var(--card);position:relative}
.node .st{font-family:var(--mono);font-size:11px;color:var(--muted2);letter-spacing:.22em;text-transform:uppercase}
.node .big{font-family:var(--display);font-weight:700;font-size:25px;margin:10px 0 3px;color:var(--fg);letter-spacing:-.01em}
.node .sub{font-family:var(--mono);font-size:11px;color:var(--accent);text-transform:uppercase;letter-spacing:.18em;margin-bottom:16px}
.node p{font-size:13.5px;line-height:1.55;color:var(--muted);margin:0}
.conn{display:flex;align-items:center;justify-content:center;padding:0 16px;color:var(--accent);font-size:20px;font-family:var(--mono)}
.feedback{
  margin-top:16px;border:1px dashed var(--line-strong);border-radius:var(--r);
  padding:15px 24px;display:flex;align-items:center;gap:13px;justify-content:center;
  color:var(--muted);font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;text-align:center;
}
.feedback b{color:var(--accent)}

/* --- category / traits --- */
.cat{display:grid;grid-template-columns:0.9fr 1.1fr;gap:60px;align-items:start}
.traits{display:flex;flex-direction:column}
.trait{padding:19px 0;border-top:1px solid var(--line);display:flex;gap:16px;align-items:baseline}
.trait:first-child{border-top:none}
.trait i{font-family:var(--mono);color:var(--accent);font-size:12px;font-style:normal;min-width:26px}
.trait div b{display:block;font-family:var(--display);font-weight:700;font-size:16px;color:var(--fg);margin-bottom:3px}
.trait div span{font-size:13.5px;line-height:1.5;color:var(--muted)}

/* ============================ FOOTER ============================ */
.foot{
  padding-block:100px;text-align:center;border-top:1px solid var(--line);
  background:radial-gradient(720px 320px at 50% 120%,color-mix(in srgb,var(--accent) 14%,transparent),transparent 68%);
  background-repeat:no-repeat;
}
.foot .fbig{
  font-family:var(--display);font-weight:800;
  font-size:clamp(34px,5.6vw,50px);line-height:1.06;letter-spacing:-.035em;
  margin:0 0 30px;color:var(--fg);
}
.foot .frow{display:flex;gap:18px;justify-content:center;align-items:center;flex-wrap:wrap}
.foot .dom{margin-top:46px;font-family:var(--mono);font-size:12.5px;letter-spacing:.16em;color:var(--muted2)}

/* ============================ SCROLL REVEAL ============================ */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.is-visible{opacity:1;transform:none}

/* ============================ RESPONSIVE ============================ */
@media (max-width:900px){
  :root{--pad:32px}
  .navlinks{
    position:fixed;inset:var(--nav-h) 0 auto 0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--bg);border-bottom:1px solid var(--line);
    padding:8px 32px 24px;
    transform:translateY(-12px);opacity:0;pointer-events:none;
    transition:transform .2s ease,opacity .2s ease;
  }
  .navlinks.open{transform:none;opacity:1;pointer-events:auto}
  .navlinks a{padding:15px 0;border-bottom:1px solid var(--line);font-size:16px}
  .navlinks a.btn{
    justify-content:center;margin-top:16px;border-bottom:none;
    color:var(--accent-fg);font-size:15px;padding:14px 20px;
  }
  .nav-toggle{display:flex}

  .grid3{grid-template-columns:1fr;gap:16px;margin-top:40px}

  .stage{grid-template-columns:1fr;gap:14px}
  .conn{transform:rotate(90deg);padding:4px 0}

  .cat{grid-template-columns:1fr;gap:36px}
}

@media (max-width:560px){
  :root{--pad:22px}
  .hero{padding-top:64px;padding-bottom:56px}
  .section{padding-block:60px}
  .foot{padding-block:72px}
  .flow{margin-top:44px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *{transition-duration:.001ms !important}
}