/* =========================================================
   jCypher · Concept 02 "Cobalt"
   Dark, precise, engineering-led — blueprint grid + glow
   ========================================================= */
:root{
  --bg:#05070F;
  --bg-raise:#0A0F1F;
  --panel:#0C1226;
  --line:rgba(96,165,250,.16);
  --line-strong:rgba(96,165,250,.34);
  --blue:#3B82F6;
  --sky:#60A5FA;
  --cyan:#38BDF8;
  --ink:#E5EBFA;
  --muted:#8DA0C6;
  --dim:#5A6C93;
  --ok:#34D399;
  --font-head:'Space Grotesk',sans-serif;
  --font-body:'Inter',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',monospace;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--ink);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
.container{max-width:1120px;margin:0 auto;padding:0 28px}
a{color:inherit}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:3px}

/* blueprint grid backdrop */
.grid-bg{
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(1000px 560px at 50% -10%, rgba(37,99,235,.16), transparent 65%),
    linear-gradient(rgba(96,165,250,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(96,165,250,.05) 1px,transparent 1px);
  background-size:auto,42px 42px,42px 42px;
}
.grid-bg::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(700px 380px at 85% 110%, rgba(56,189,248,.07), transparent 65%);
}

h1,h2,h3{font-family:var(--font-head);letter-spacing:-.02em;line-height:1.12}
h2{font-size:clamp(1.7rem,3.6vw,2.5rem);font-weight:700}
.glow{
  color:var(--sky);
  text-shadow:0 0 26px rgba(59,130,246,.65),0 0 60px rgba(59,130,246,.3);
}
.mono{font-family:var(--font-mono)}
.tag{
  display:inline-block;font-family:var(--font-mono);font-size:.7rem;font-weight:500;
  letter-spacing:.2em;color:var(--cyan);
  border:1px solid rgba(56,189,248,.35);border-radius:5px;
  padding:.34rem .8rem;margin-bottom:18px;
  background:rgba(56,189,248,.05);
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  font-family:var(--font-head);font-weight:600;text-decoration:none;cursor:pointer;
  border:1px solid transparent;border-radius:9px;
  padding:.72rem 1.5rem;font-size:.94rem;letter-spacing:.01em;
  transition:transform .22s,box-shadow .22s,background .22s,border-color .22s;
}
.btn-lg{padding:.9rem 1.9rem;font-size:1rem}
.btn-sm{padding:.5rem 1.05rem;font-size:.85rem}
.btn-primary{
  background:var(--blue);color:#fff;
  box-shadow:0 0 0 1px rgba(96,165,250,.4),0 8px 30px rgba(37,99,235,.45);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 0 1px rgba(96,165,250,.6),0 12px 40px rgba(37,99,235,.6);background:#2F74EE}
.btn-outline{border-color:var(--line-strong);color:var(--sky);background:rgba(59,130,246,.05)}
.btn-outline:hover{border-color:var(--sky);background:rgba(59,130,246,.12)}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(5,7,15,.85);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{
  display:flex;align-items:center;gap:9px;text-decoration:none;
  font-family:var(--font-head);font-weight:700;font-size:1.14rem;
}
.brand-mark{color:var(--cyan);font-size:1.2rem;text-shadow:0 0 14px rgba(56,189,248,.8)}
.brand-sub{font-family:var(--font-mono);font-size:.72rem;color:var(--dim);align-self:flex-end;margin-bottom:2px}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{
  text-decoration:none;font-size:.9rem;font-weight:500;color:var(--muted);
  transition:color .2s;
}
.nav-links a:hover{color:var(--ink)}
.nav-links .idx{font-family:var(--font-mono);font-size:.66rem;color:var(--cyan);margin-right:6px;vertical-align:1px}
.nav-links a.btn{color:#fff}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0;transition:transform .3s,opacity .3s}

/* ---------- hero ---------- */
.hero{padding:96px 0 76px;text-align:center}
.status-line{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;color:var(--muted);
  border:1px solid var(--line);border-radius:999px;padding:.5rem 1.2rem;
  background:rgba(12,18,38,.7);margin-bottom:34px;
}
.pulse{
  width:8px;height:8px;border-radius:50%;background:var(--ok);
  box-shadow:0 0 0 0 rgba(52,211,153,.6);animation:pulse 2s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(52,211,153,.55)}
  70%{box-shadow:0 0 0 9px rgba(52,211,153,0)}
  100%{box-shadow:0 0 0 0 rgba(52,211,153,0)}
}
.hero h1{
  font-size:clamp(2.4rem,6vw,4.2rem);font-weight:700;margin-bottom:22px;
}
.lede{
  color:var(--muted);font-size:1.1rem;max-width:58ch;margin:0 auto 34px;
}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:58px}

/* terminal */
.terminal{
  max-width:640px;margin:0 auto;text-align:left;
  background:var(--panel);border:1px solid var(--line-strong);border-radius:12px;
  box-shadow:0 0 60px rgba(37,99,235,.18),inset 0 1px 0 rgba(148,180,255,.08);
  overflow:hidden;
}
.term-head{
  display:flex;justify-content:space-between;align-items:center;
  padding:11px 18px;border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:.72rem;color:var(--dim);
}
.term-status{color:var(--ok);letter-spacing:.1em}
.term-body{padding:20px 22px;font-family:var(--font-mono);font-size:.85rem;line-height:2.05}
.term-line{opacity:0;transform:translateY(4px)}
.term-line.show{opacity:1;transform:none;transition:opacity .4s,transform .4s}
.term-line .pr{color:var(--cyan)}
.term-line.ok{color:var(--ok)}
.term-line .dim{color:var(--dim)}
.term-line.hl{color:var(--sky);text-shadow:0 0 16px rgba(96,165,250,.5)}

/* ---------- metrics ---------- */
.metrics{border-block:1px solid var(--line);background:rgba(10,15,31,.55)}
.metrics-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.metric{
  padding:38px 20px;text-align:center;
}
.metric + .metric{border-left:1px solid var(--line)}
.m-num{
  display:block;font-family:var(--font-mono);font-weight:700;
  font-size:clamp(2rem,4vw,3rem);color:var(--sky);
  text-shadow:0 0 24px rgba(59,130,246,.45);
}
.m-label{font-family:var(--font-mono);font-size:.74rem;color:var(--dim);letter-spacing:.06em}

/* ---------- sections ---------- */
.section{padding:96px 0}
.section-line{border-block:1px solid var(--line);background:rgba(10,15,31,.4)}
.section-head{max-width:640px;margin-bottom:54px}
.section-head p{color:var(--muted);margin-top:14px}

/* modules */
.modules{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.module{
  background:var(--panel);border:1px solid var(--line);border-radius:10px;
  padding:26px 24px;position:relative;overflow:hidden;
  transition:border-color .3s,transform .3s,box-shadow .3s;
}
.module::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--blue),var(--cyan));
  transform:scaleX(0);transform-origin:left;transition:transform .4s;
}
.module:hover{border-color:var(--line-strong);transform:translateY(-4px);box-shadow:0 18px 44px rgba(3,6,18,.7)}
.module:hover::before{transform:scaleX(1)}
.mod-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}
.mod-id{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;color:var(--cyan)}
.mod-dot{width:7px;height:7px;border-radius:50%;background:var(--blue);box-shadow:0 0 10px rgba(59,130,246,.9)}
.module h3{font-size:1.12rem;margin-bottom:10px}
.module p{font-size:.92rem;color:var(--muted);margin-bottom:18px}
.mod-foot{
  font-family:var(--font-mono);font-size:.7rem;color:var(--dim);
  border-top:1px dashed var(--line);padding-top:12px;letter-spacing:.04em;
}

/* standards */
.standards{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.standard{padding:30px 28px;border:0 solid var(--line)}
.standard:nth-child(1){border-right-width:1px;border-bottom-width:1px}
.standard:nth-child(2){border-bottom-width:1px}
.standard:nth-child(3){border-right-width:1px}
.std-key{
  display:block;font-family:var(--font-mono);font-size:.74rem;font-weight:700;
  letter-spacing:.24em;color:var(--sky);margin-bottom:10px;
}
.standard p{color:var(--muted);font-size:.94rem}

/* pipeline */
.pipeline{
  display:grid;grid-template-columns:repeat(6,1fr);gap:0;
  border-top:1px solid var(--line-strong);counter-reset:stage;
}
.stage{
  padding:28px 18px 6px;position:relative;
}
.stage::before{
  content:"";position:absolute;top:-5px;left:0;
  width:9px;height:9px;border-radius:50%;
  background:var(--blue);box-shadow:0 0 12px rgba(59,130,246,.9);
}
.stage-num{font-family:var(--font-mono);font-size:.72rem;color:var(--cyan);letter-spacing:.16em}
.stage h3{font-size:1rem;margin:8px 0 6px}
.stage p{font-size:.83rem;color:var(--muted)}

/* logs */
.logs{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.log{
  background:var(--panel);border:1px solid var(--line);border-radius:10px;
  padding:24px;display:flex;flex-direction:column;gap:16px;
}
.log-meta{display:flex;justify-content:space-between;font-family:var(--font-mono);font-size:.7rem}
.log-id{color:var(--dim);letter-spacing:.08em}
.log-org{color:var(--cyan)}
.log blockquote{font-size:.95rem;line-height:1.7;color:var(--ink)}
.log figcaption{font-size:.82rem;color:var(--muted);margin-top:auto}

/* ---------- CTA ---------- */
.cta{padding:110px 0;text-align:center;position:relative;overflow:hidden}
.cta::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(560px 300px at 50% 60%, rgba(37,99,235,.22), transparent 70%);
}
.cta-inner{position:relative}
.cta h2{font-size:clamp(2rem,4.6vw,3.2rem);margin-bottom:16px}
.cta p{color:var(--muted);max-width:52ch;margin:0 auto 32px}
.cta-form{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.cta-form input{
  width:min(340px,100%);padding:.9rem 1.2rem;
  background:var(--panel);border:1px solid var(--line-strong);border-radius:9px;
  color:var(--ink);font:inherit;font-size:.95rem;
}
.cta-form input::placeholder{color:var(--dim)}
.cta-form input:focus{outline:none;border-color:var(--sky);box-shadow:0 0 0 3px rgba(59,130,246,.25)}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--line);padding:34px 0}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.footer-links{display:flex;gap:26px;flex-wrap:wrap}
.footer-links a{text-decoration:none;font-size:.88rem;color:var(--muted);transition:color .2s}
.footer-links a:hover{color:var(--sky)}
.footer-note{font-family:var(--font-mono);font-size:.72rem;color:var(--dim)}

/* ---------- concept switcher ---------- */
.switcher{
  position:fixed;bottom:22px;right:22px;z-index:60;
  display:flex;gap:6px;padding:6px;
  background:rgba(12,18,38,.94);border:1px solid var(--line-strong);border-radius:999px;
  box-shadow:0 12px 32px rgba(0,0,0,.6);
  backdrop-filter:blur(8px);
}
.switcher a{
  width:36px;height:36px;border-radius:50%;display:grid;place-items:center;
  color:var(--muted);text-decoration:none;font-weight:600;font-size:.85rem;
  font-family:var(--font-head);transition:background .2s,color .2s;
}
.switcher a:hover{background:rgba(96,165,250,.16);color:#fff}
.switcher a.active{background:var(--blue);color:#fff;box-shadow:0 0 16px rgba(59,130,246,.7)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s !important;transition-duration:.001s !important}
  .reveal,.term-line{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .modules,.logs{grid-template-columns:repeat(2,1fr)}
  .pipeline{grid-template-columns:repeat(3,1fr);row-gap:26px}
}
@media (max-width:768px){
  .nav-toggle{display:block}
  .nav-links{
    position:fixed;inset:68px 0 auto 0;z-index:49;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--bg-raise);border-bottom:1px solid var(--line-strong);
    max-height:0;overflow:hidden;transition:max-height .4s ease;
  }
  .nav-links.open{max-height:380px}
  .nav-links a{padding:16px 28px;border-top:1px solid var(--line)}
  .nav-links a.btn{margin:14px 28px 20px;justify-content:center}
  .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)}
  .metrics-grid{grid-template-columns:repeat(2,1fr)}
  .metric:nth-child(3){border-left:0}
  .metric:nth-child(1),.metric:nth-child(2){border-bottom:1px solid var(--line)}
  .standards{grid-template-columns:1fr}
  .standard{border-right-width:0 !important;border-bottom-width:1px !important}
  .standard:last-child{border-bottom-width:0 !important}
  .section{padding:70px 0}
}
@media (max-width:560px){
  .container{padding:0 20px}
  .modules,.logs{grid-template-columns:1fr}
  .pipeline{grid-template-columns:1fr;border-top:0;border-left:1px solid var(--line-strong);padding-left:22px}
  .stage{padding:0 0 26px}
  .stage::before{left:-27px;top:4px}
  .hero{padding:70px 0 56px}
  .status-line{font-size:.6rem;padding:.45rem .9rem}
  .switcher{bottom:14px;right:14px}
}