/* ===============
   Base / Tokens
   =============== */
:root{
  --bg-900:#071521;
  --bg-800:#0b1e2d;
  --text-100:#e9f0f6;
  --text-300:#cdd8e2;
  --accent:#35d2a1;
  --brand:#8bc3ff;
  --card:#0f2638;
  --stroke:rgba(255,255,255,.06);
  --shadow:0 12px 40px rgba(0,0,0,.35);
  --radius:14px;
  --radius-lg:18px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text-100);
  background: radial-gradient(1200px 600px at 20% -10%, rgba(53,210,161,.08), transparent 60%) ,
              radial-gradient(800px 600px at 85% 20%, rgba(139,195,255,.08), transparent 60%) ,
              var(--bg-900);
  line-height:1.55;
}

/* Layout helpers */
.container{
  width:min(1200px, 92vw);
  margin-inline:auto;
}

.section{ padding: clamp(48px, 8vw, 80px) 0; }

/* ===============
   Navbar
   =============== */
.navbar-wrapper{
  background:#000;
  position:sticky; top:0; z-index:40;
  border-bottom:1px solid var(--stroke);
}
.navbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 0;
}
.logo{
  color:#fff; text-decoration:none; font-weight:800; letter-spacing:.2px;
  font-size:20px;
}
.logo sup{ font-size:11px; opacity:.7; margin-left:2px; }

.menu-toggle{
  display:none;
  background:#111; color:#fff; border:1px solid var(--stroke);
  border-radius:10px; padding:6px 10px; cursor:pointer;
}

/* horizontal nav */
.nav-links{
  display:flex; gap:22px; list-style:none; margin:0; padding:0;
}
.nav-links a{
  color:#fff; text-decoration:none; font-weight:600;
  padding:8px 4px; border-radius:8px; opacity:.9;
}
.nav-links a:hover, .nav-links a.active{ color:var(--brand); opacity:1; }

/* ===============
   Hero — shared
   =============== */
.kicker{
  color:var(--brand); text-transform:uppercase; letter-spacing:.14em;
  font-weight:700; font-size:.78rem; margin:0 0 10px;
}
h1{
  font-size: clamp(28px, 4.4vw, 48px);
  line-height:1.12;
  margin:0 0 14px;
}
.lead{
  color:var(--text-300);
  font-size: clamp(15px, 1.6vw, 18px);
  margin:0 0 22px;
}

/* Buttons */
.btn{
  display:inline-block; padding:12px 16px; border-radius:12px;
  text-decoration:none; color:#fff; background:transparent;
  border:1px solid var(--stroke); margin-right:10px; font-weight:700;
}
.btn:hover{ border-color:#2e5bff; color:#dbe7ff; }
.btn-primary{ background:#2e5bff; border-color:#2e5bff; }
.btn-primary:hover{ filter:brightness(1.05); }

/* ===============
   Home — hero grid
   =============== */
.hero-grid{
  display:grid; gap:36px; align-items:center;
  grid-template-columns: 1.1fr .9fr;
}
.hero-copy{}
.hero-visual img{
  width:100%; height:auto; display:block;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  object-fit: cover;
}

/* Features strip to keep visual rhythm like on Home */
.features-grid{
  display:grid; gap:18px; grid-template-columns: repeat(3, 1fr);
}
.feature{
  background:var(--card); border:1px solid var(--stroke); border-radius:var(--radius);
  padding:18px;
}
.feature h3{ margin:0 0 6px; color:#d9ecff; }

/* ===============
   Architecture page
   =============== */
.hero--simple{ padding-top: clamp(40px, 8vw, 80px); }
.hero-narrow{ width:min(900px, 92vw); text-align:center; }

.arch-figure{ margin: 22px auto 8px; }
.arch-diagram{
  width:100%;
  max-width: 600px; /* asked: smaller than 840px */
  display:block;
  margin-inline:auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}
.arch-caption{
  color:var(--text-300);
  font-size:.92rem;
  margin-top:8px;
}

/* ===============
   Footer
   =============== */
.site-footer{
  background: #0a1723;
  border-top:1px solid var(--stroke);
  padding:22px 0; text-align:center; color:#a8b7c6;
}

/* ===============
   Responsive
   =============== */
@media (max-width: 980px){
  .hero-grid{ grid-template-columns: 1fr; }
  .features-grid{ grid-template-columns: 1fr; }
}
@media (max-width: 820px){
  .menu-toggle{ display:block; }
  .nav{ position:absolute; inset:56px 0 auto 0; background:#050b11; border-bottom:1px solid var(--stroke); display:none; }
  .nav.open{ display:block; }
  .nav-links{ padding:14px 20px; flex-direction:column; gap:10px; }
}