/* ============================================================
   OGP — Open Gateway Protocol · landing site
   Deep Ocean brand. Space Grotesk (display) + Poppins (UI) +
   JetBrains Mono (code).
   ============================================================ */

:root{
  /* Deep Ocean palette */
  --navy:    #04132E;   /* deepest */
  --navy-2:  #07203f;
  --cobalt:  #0B3C8C;
  --blue:    #1E72E0;   /* primary */
  --blue-2:  #3B8BFF;
  --cyan:    #35D6FF;   /* signal node */
  --cyan-soft:#9fe9ff;

  /* neutrals */
  --ink:     #0c1626;
  --ink-soft:#46556c;
  --ink-faint:#7d8aa0;
  --line:    #e4e9f1;
  --line-2:  #eef2f7;
  --surface: #ffffff;
  --surface-tint:#f6f8fc;
  --surface-blue:#eef5ff;

  /* dark-section text */
  --on-dark:        #eaf2ff;
  --on-dark-soft:   #a9bbd6;
  --on-dark-faint:  #6f83a4;
  --dark-line:      rgba(255,255,255,0.10);
  --dark-card:      rgba(255,255,255,0.04);

  --font-display:"Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-sans:"Poppins", ui-sans-serif, system-ui, sans-serif;
  --font-mono:"JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --maxw: 1180px;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-pill: 999px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0; font-family:var(--font-sans); color:var(--ink);
  background:var(--surface); -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility; line-height:1.5;
}
a{color:inherit; text-decoration:none;}
img{display:block; max-width:100%;}
::selection{background:var(--cyan); color:var(--navy);}

.wrap{max-width:var(--maxw); margin:0 auto; padding:0 28px;}
.eyebrow{
  font-family:var(--font-mono); font-size:12.5px; font-weight:500;
  letter-spacing:0.16em; text-transform:uppercase; color:var(--blue);
}
.eyebrow.on-dark{color:var(--cyan);}

h1,h2,h3{font-family:var(--font-display); font-weight:700; letter-spacing:-0.02em; line-height:1.05; margin:0;}
p{margin:0;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:9px; cursor:pointer;
  font-family:var(--font-sans); font-weight:600; font-size:15px;
  padding:13px 22px; border-radius:var(--r-pill); border:1px solid transparent;
  transition:transform .12s ease, background .18s ease, box-shadow .18s ease, border-color .18s ease, color .18s ease;
  white-space:nowrap;
}
.btn svg{width:17px; height:17px;}
.btn-primary{
  background:linear-gradient(180deg,var(--blue-2),var(--blue));
  color:#fff; box-shadow:0 8px 22px -8px rgba(30,114,224,0.7);
}
.btn-primary:hover{transform:translateY(-1px); box-shadow:0 12px 28px -8px rgba(30,114,224,0.8);}
.btn-ghost{background:rgba(255,255,255,0.06); color:var(--on-dark); border-color:var(--dark-line);}
.btn-ghost:hover{background:rgba(255,255,255,0.12); border-color:rgba(255,255,255,0.28);}
.btn-light{background:var(--navy); color:#fff;}
.btn-light:hover{transform:translateY(-1px); background:var(--cobalt);}
.btn-outline{background:transparent; color:var(--ink); border-color:var(--line);}
.btn-outline:hover{border-color:var(--blue); color:var(--blue);}

/* ---------- nav ---------- */
.nav{
  position:sticky; top:0; z-index:50;
  background:rgba(4,19,46,0.78); backdrop-filter:blur(14px);
  border-bottom:1px solid var(--dark-line);
}
.nav-inner{display:flex; align-items:center; gap:28px; height:68px;}
.brand{display:flex; align-items:center; gap:11px;}
.brand .mark{width:30px; height:30px; border-radius:8px; flex-shrink:0;}
.brand .word{font-family:var(--font-display); font-weight:700; font-size:19px; color:#fff; letter-spacing:-0.01em;}
.brand .word b{color:var(--cyan); font-weight:700;}
.nav-links{display:flex; gap:26px; margin-left:8px;}
.nav-links a{font-size:14.5px; font-weight:500; color:var(--on-dark-soft); transition:color .15s ease;}
.nav-links a:hover{color:#fff;}
.nav-spacer{flex:1;}
.nav-cta{display:flex; align-items:center; gap:14px;}
.nav-ghost{font-size:14.5px; font-weight:600; color:var(--on-dark-soft);}
.nav-ghost:hover{color:#fff;}

/* ---------- hero ---------- */
.hero{
  position:relative; overflow:hidden; color:var(--on-dark);
  background:
    radial-gradient(120% 90% at 82% -8%, rgba(53,214,255,0.18) 0%, rgba(53,214,255,0) 46%),
    radial-gradient(90% 120% at 10% 110%, rgba(30,114,224,0.30) 0%, rgba(30,114,224,0) 55%),
    linear-gradient(165deg, #04132E 0%, #07254c 52%, #04132E 100%);
}
.hero-grid-bg{position:absolute; inset:0; opacity:.5; pointer-events:none;}
.hero-inner{position:relative; display:grid; grid-template-columns:1.15fr 0.85fr; gap:48px; align-items:center; padding:88px 0 104px;}
.hero-badge{
  display:inline-flex; align-items:center; gap:9px; padding:6px 14px 6px 10px;
  border-radius:var(--r-pill); border:1px solid var(--dark-line);
  background:rgba(255,255,255,0.05); font-size:13px; color:var(--on-dark-soft); margin-bottom:26px;
}
.hero-badge .dot{width:7px; height:7px; border-radius:50%; background:var(--cyan); box-shadow:0 0 0 4px rgba(53,214,255,0.2); animation:pulse 2.4s ease-in-out infinite;}
@keyframes pulse{0%,100%{box-shadow:0 0 0 3px rgba(53,214,255,0.22);}50%{box-shadow:0 0 0 7px rgba(53,214,255,0);}}
.hero h1{font-size:clamp(42px, 5.4vw, 72px); color:#fff;}
.hero h1 .grad{background:linear-gradient(100deg,var(--cyan),var(--blue-2)); -webkit-background-clip:text; background-clip:text; color:transparent;}
.hero-sub{margin-top:24px; font-size:19px; line-height:1.6; color:var(--on-dark-soft); max-width:540px;}
.hero-sub b{color:var(--on-dark); font-weight:600;}
.hero-actions{display:flex; gap:14px; margin-top:34px; flex-wrap:wrap;}
.hero-meta{display:flex; gap:26px; margin-top:38px; flex-wrap:wrap;}
.hero-meta .m{display:flex; flex-direction:column; gap:3px;}
.hero-meta .m b{font-family:var(--font-display); font-size:21px; color:#fff; font-weight:700;}
.hero-meta .m span{font-size:13px; color:var(--on-dark-faint);}

/* hero install line */
.install{
  display:inline-flex; align-items:center; gap:14px; margin-top:30px;
  background:rgba(0,0,0,0.28); border:1px solid var(--dark-line);
  border-radius:var(--r-pill); padding:11px 12px 11px 20px; font-family:var(--font-mono); font-size:14.5px;
}
.install .pmt{color:var(--cyan);}
.install code{color:var(--on-dark);}
.install button{
  margin-left:4px; border:0; cursor:pointer; background:rgba(255,255,255,0.08);
  color:var(--on-dark-soft); border-radius:var(--r-pill); padding:7px 14px; font-family:var(--font-sans);
  font-size:12.5px; font-weight:600; transition:background .15s, color .15s;
}
.install button:hover{background:var(--cyan); color:var(--navy);}

/* hero art — the open ring / federation node */
.hero-art{position:relative; display:flex; align-items:center; justify-content:center; min-height:380px;}

/* ---------- sections ---------- */
section{position:relative;}
.section{padding:96px 0;}
.section-head{max-width:640px; margin-bottom:54px;}
.section-head h2{font-size:clamp(30px,3.6vw,46px); margin-top:16px;}
.section-head p{margin-top:18px; font-size:18px; line-height:1.6; color:var(--ink-soft);}
.center{margin-left:auto; margin-right:auto; text-align:center;}

/* what — three pillars */
.pillars{display:grid; grid-template-columns:repeat(3,1fr); gap:22px;}
.pillar{
  border:1px solid var(--line); border-radius:var(--r-lg); padding:30px 28px;
  background:var(--surface); transition:border-color .18s, box-shadow .18s, transform .18s;
}
.pillar:hover{border-color:#c9dcff; box-shadow:0 18px 40px -22px rgba(12,42,90,0.35); transform:translateY(-2px);}
.pillar .ic{width:46px; height:46px; border-radius:12px; display:grid; place-items:center; margin-bottom:18px;
  background:var(--surface-blue); color:var(--blue);}
.pillar .ic svg{width:24px; height:24px;}
.pillar h3{font-size:20px; letter-spacing:-0.01em;}
.pillar p{margin-top:10px; font-size:15px; line-height:1.6; color:var(--ink-soft);}

/* how it works */
.how{background:var(--surface-tint); border-top:1px solid var(--line); border-bottom:1px solid var(--line);}
.steps{display:grid; grid-template-columns:repeat(4,1fr); gap:0; counter-reset:step;}
.step{position:relative; padding:0 26px;}
.step:not(:last-child)::after{content:""; position:absolute; top:19px; right:-8px; width:16px; height:1px; background:var(--line);}
.step .num{
  width:40px; height:40px; border-radius:50%; display:grid; place-items:center; margin-bottom:20px;
  font-family:var(--font-display); font-weight:700; font-size:16px; color:#fff;
  background:linear-gradient(180deg,var(--blue-2),var(--blue)); box-shadow:0 6px 16px -6px rgba(30,114,224,0.7);
}
.step h3{font-size:18px;}
.step p{margin-top:9px; font-size:14.5px; line-height:1.6; color:var(--ink-soft);}
.step code{font-family:var(--font-mono); font-size:13px; background:#fff; border:1px solid var(--line); border-radius:6px; padding:2px 7px; color:var(--cobalt);}

/* features grid */
.features{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:var(--r-lg); overflow:hidden;}
.feature{background:var(--surface); padding:30px 28px; transition:background .18s;}
.feature:hover{background:var(--surface-tint);}
.feature .fi{display:flex; align-items:center; gap:11px; margin-bottom:13px;}
.feature .fi svg{width:20px; height:20px; color:var(--blue); flex-shrink:0;}
.feature h3{font-size:16.5px; letter-spacing:-0.005em;}
.feature p{font-size:14px; line-height:1.58; color:var(--ink-soft);}
.feature .tag{font-family:var(--font-mono); font-size:11px; color:var(--blue); background:var(--surface-blue); padding:2px 8px; border-radius:5px; margin-left:auto;}

/* quickstart terminal */
.qs{background:var(--navy); color:var(--on-dark); overflow:hidden;}
.qs-grid{display:grid; grid-template-columns:0.9fr 1.1fr; gap:56px; align-items:center;}
.qs h2{color:#fff; font-size:clamp(30px,3.4vw,44px);}
.qs p{color:var(--on-dark-soft); font-size:18px; line-height:1.6; margin-top:18px;}
.qs ul{list-style:none; padding:0; margin:28px 0 0; display:flex; flex-direction:column; gap:14px;}
.qs li{display:flex; gap:12px; align-items:flex-start; font-size:15px; color:var(--on-dark-soft);}
.qs li svg{width:19px; height:19px; color:var(--cyan); flex-shrink:0; margin-top:2px;}
.term{
  border-radius:var(--r-md); overflow:hidden; border:1px solid var(--dark-line);
  background:#020c1d; box-shadow:0 40px 90px -40px rgba(0,0,0,0.8);
}
.term-bar{display:flex; align-items:center; gap:8px; padding:13px 16px; background:rgba(255,255,255,0.03); border-bottom:1px solid var(--dark-line);}
.term-bar .tl{display:flex; gap:7px;}
.term-bar .tl i{width:11px; height:11px; border-radius:50%; display:block;}
.term-bar .ttl{margin-left:8px; font-family:var(--font-mono); font-size:12.5px; color:var(--on-dark-faint);}
.term-body{padding:22px 22px 26px; font-family:var(--font-mono); font-size:13.5px; line-height:1.85;}
.term-body .l{white-space:pre-wrap;}
.term-body .c{color:var(--on-dark-faint);}
.term-body .pmt{color:var(--cyan);}
.term-body .cmd{color:#fff;}
.term-body .ok{color:#5be3a7;}
.term-body .dim{color:var(--on-dark-soft);}

/* companion */
.companion-card{
  display:grid; grid-template-columns:1fr 1fr; gap:0; align-items:stretch;
  border:1px solid var(--line); border-radius:var(--r-lg); overflow:hidden; background:var(--surface);
}
.companion-copy{padding:54px 50px;}
.companion-copy h2{font-size:clamp(28px,3vw,40px);}
.companion-copy p{margin-top:18px; font-size:17px; line-height:1.6; color:var(--ink-soft);}
.companion-copy .clist{margin:26px 0 30px; display:flex; flex-direction:column; gap:12px;}
.companion-copy .clist div{display:flex; gap:11px; align-items:center; font-size:15px; color:var(--ink);}
.companion-copy .clist svg{width:18px; height:18px; color:var(--blue); flex-shrink:0;}
.companion-actions{display:flex; flex-wrap:wrap; gap:12px;}
.companion-note{margin-top:16px; font-size:13px; color:var(--ink-soft);}
.companion-note a{color:var(--blue); text-decoration:none;}
.companion-note a:hover{text-decoration:underline;}
.companion-visual{
  position:relative; background:
    radial-gradient(100% 100% at 80% 0%, rgba(53,214,255,0.16), transparent 50%),
    linear-gradient(160deg,#07254c,#04132E);
  display:flex; align-items:center; justify-content:center; padding:40px; overflow:hidden;
}

/* CTA band */
.cta{
  position:relative; overflow:hidden; text-align:center; color:#fff;
  background:radial-gradient(120% 140% at 50% -20%, rgba(53,214,255,0.22), transparent 55%), linear-gradient(165deg,#0B3C8C,#04132E);
}
.cta-inner{padding:96px 0;}
.cta h2{font-size:clamp(32px,4vw,52px); color:#fff;}
.cta p{margin:20px auto 0; max-width:560px; font-size:18px; color:var(--on-dark-soft); line-height:1.6;}
.cta .hero-actions{justify-content:center;}

/* footer */
.footer{background:var(--navy); color:var(--on-dark-soft); border-top:1px solid var(--dark-line);}
.footer-inner{padding:60px 0 40px; display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:36px;}
.footer .brand .word{font-size:18px;}
.footer-col h4{font-family:var(--font-sans); font-size:13px; font-weight:600; letter-spacing:0.04em; text-transform:uppercase; color:var(--on-dark-faint); margin:0 0 16px;}
.footer-col a{display:block; font-size:14.5px; color:var(--on-dark-soft); margin-bottom:11px; transition:color .15s;}
.footer-col a:hover{color:#fff;}
.footer-blurb{font-size:14px; line-height:1.65; color:var(--on-dark-faint); margin-top:16px; max-width:280px;}
.footer-bottom{border-top:1px solid var(--dark-line); padding:22px 0; display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px;}
.footer-bottom span{font-size:13px; color:var(--on-dark-faint);}
.footer-bottom .endpoint{font-family:var(--font-mono); color:var(--cyan);}

/* responsive */
@media (max-width:920px){
  .hero-inner{grid-template-columns:1fr; gap:20px;}
  .hero-art{min-height:300px; order:-1;}
  .qs-grid{grid-template-columns:1fr; gap:36px;}
  .companion-card{grid-template-columns:1fr;}
  .pillars,.features{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr 1fr; gap:34px 22px;}
  .step:not(:last-child)::after{display:none;}
  .footer-inner{grid-template-columns:1fr 1fr;}
  .nav-links{display:none;}
}
@media (max-width:560px){
  .steps{grid-template-columns:1fr;}
  .footer-inner{grid-template-columns:1fr;}
  .hero-meta{gap:18px;}
}