:root {
  --bg: #0b0f17;
  --bg-alt: #11172300;
  --surface: #141b29;
  --surface-2: #1b2435;
  --border: #232e44;
  --text: #e6ecf5;
  --muted: #93a1b8;
  --brand: #4f9dff;
  --brand-2: #38e0c4;
  --green: #3ddc97;
  --radius: 14px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 70% -10%, #16203a 0%, var(--bg) 55%);
  color: var(--text);
  line-height: 1.6;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

a { color: inherit; text-decoration: none; }
a.link { color: var(--brand); text-decoration: underline; text-underline-offset: 3px; }
a.link:hover { color: var(--brand-2); }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(11, 15, 23, 0.7);
  border-bottom: 1px solid var(--border);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 700; font-size: 18px; letter-spacing: 0.2px; }
.brand__mark { color: var(--brand-2); margin-right: 6px; }
.brand__sub { color: var(--muted); font-weight: 600; }
.nav__links { display: flex; gap: 24px; }
.nav__links a { color: var(--muted); font-size: 14px; transition: color 0.15s; }
.nav__links a:hover { color: var(--text); }

/* Hero */
.hero { padding: 96px 0 64px; }
.hero__badges-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.hero__eyebrow {
  text-transform: uppercase; letter-spacing: 2px; font-size: 12px;
  color: var(--brand-2); margin: 0 0 16px;
}
.hero__title { font-size: clamp(30px, 5vw, 52px); line-height: 1.1; margin: 0 0 20px; font-weight: 800; }
.hero__title .accent { color: var(--brand); }
.hero__lead { font-size: 18px; color: var(--muted); max-width: 720px; margin: 0 0 32px; }
.hero__lead strong { color: var(--text); }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 28px; }
.hero__badges { display: flex; gap: 10px; flex-wrap: wrap; }

.badge {
  font-size: 13px; color: var(--muted);
  border: 1px solid var(--border); background: var(--surface);
  padding: 6px 12px; border-radius: 999px;
}
.badge--brand {
  color: var(--brand);
  background: rgba(79, 157, 255, 0.12);
  border-color: rgba(79, 157, 255, 0.25);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge--proven {
  color: var(--green);
  background: rgba(61, 220, 151, 0.1);
  border-color: rgba(61, 220, 151, 0.25);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge--dev {
  color: #f0b429;
  background: rgba(240, 180, 41, 0.12);
  border-color: rgba(240, 180, 41, 0.3);
  font-size: 11px;
  vertical-align: middle;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 15px;
  border: 1px solid transparent; transition: transform 0.1s, background 0.15s, border 0.15s;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: linear-gradient(135deg, var(--brand), #3a7bff); color: #fff; }
.btn--primary:hover { filter: brightness(1.08); }
.btn--ghost { border-color: var(--border); color: var(--text); background: var(--surface); }
.btn--ghost:hover { border-color: var(--brand); }

/* Sections */
.section { padding: 72px 0; }
.section--alt { background: linear-gradient(180deg, rgba(20,27,41,0.5), rgba(20,27,41,0)); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section__title { font-size: clamp(24px, 3.5vw, 34px); margin: 0 0 10px; font-weight: 800; }
.section__lead { color: var(--muted); font-size: 17px; max-width: 720px; margin: 0 0 36px; }
.subsection__title { font-size: 1.15rem; font-weight: 700; margin: 40px 0 18px; }

/* Overview intro */
.intro-card {
  background: linear-gradient(135deg, #1a2233 0%, #12151c 60%, #0d0f14 100%);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.75rem 2rem;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}
.intro-card::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -15%;
  width: 50%;
  height: 120%;
  background: radial-gradient(circle, rgba(79, 157, 255, 0.12) 0%, transparent 70%);
  pointer-events: none;
}
.intro-card p {
  position: relative;
  margin: 0;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.65;
}
.intro-card p + p { margin-top: 0.85rem; }
.intro-card strong { color: var(--text); }

/* Compare */
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.compare__col {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}
.compare__col h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 0.75rem;
}
.compare__col--old h3 { color: #f07178; }
.compare__col--new h3 { color: var(--green); }
.compare__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14.5px;
}
.compare__col li {
  padding: 0.35rem 0 0.35rem 1.25rem;
  position: relative;
  color: var(--muted);
}
.compare__col li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--muted);
}
.compare__col--new li::before {
  content: "✓";
  color: var(--green);
  font-weight: 700;
}

/* Pillars */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 8px;
}
.pillar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.pillar__icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
.pillar h3 { margin: 0 0 0.5rem; font-size: 16px; }
.pillar p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.55; }

/* Roadmap */
.roadmap { margin-top: 12px; }
.roadmap__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.roadmap__card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
}
.roadmap__card h4 { margin: 0 0 0.5rem; font-size: 15px; }
.roadmap__card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.55; }

/* Hardware */
.hw-box {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 36px 0 24px;
}
.hw-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.1rem 1.2rem;
  text-align: center;
}
.hw-item__value {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--brand);
  margin-bottom: 0.35rem;
}
.hw-item__label {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.4;
}

/* Proven */
.proven {
  padding: 1.4rem 1.5rem;
  background: rgba(61, 220, 151, 0.06);
  border: 1px solid rgba(61, 220, 151, 0.2);
  border-radius: var(--radius);
}
.proven p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.6; }
.proven strong { color: var(--green); }

.overview__more {
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 15px;
}
.overview__more a {
  color: var(--brand);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.overview__more a:hover { color: var(--brand-2); }

/* Feature grid */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
  transition: transform 0.15s, border 0.15s;
}
.card:hover { transform: translateY(-3px); border-color: var(--brand); }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* Steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
.step {
  display: flex; gap: 18px; align-items: flex-start;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 22px;
}
.step__num {
  flex: 0 0 auto; width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700;
  background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #06121f;
}
.step h3 { margin: 0 0 4px; font-size: 17px; }
.step p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* Code */
.code {
  background: #0a0e16; border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; max-width: 760px;
}
.code__bar {
  display: flex; align-items: center; padding: 10px 16px;
  border-bottom: 1px solid var(--border); color: var(--muted); font-size: 13px;
}
.code pre { margin: 0; padding: 18px 20px; overflow-x: auto; }
.code code { font-family: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace; font-size: 13.5px; color: #cfe3ff; }
.note { color: var(--muted); font-size: 14px; margin-top: 16px; }

/* FAQ */
.faq { display: grid; gap: 12px; max-width: 760px; }
.faq details {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 18px;
}
.faq summary { cursor: pointer; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+ "; color: var(--brand-2); font-weight: 700; }
.faq details[open] summary::before { content: "– "; }
.faq p { margin: 10px 0 0; color: var(--muted); font-size: 14.5px; }

/* Footer */
.footer { border-top: 1px solid var(--border); padding: 28px 0; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.footer__muted { color: var(--muted); font-size: 14px; }

@media (max-width: 860px) {
  .grid { grid-template-columns: 1fr 1fr; }
  .pillars { grid-template-columns: 1fr 1fr; }
  .roadmap__grid { grid-template-columns: 1fr; }
  .hw-box { grid-template-columns: 1fr; }
  .compare { grid-template-columns: 1fr; }
  .nav__links { display: none; }
}
@media (max-width: 560px) {
  .grid { grid-template-columns: 1fr; }
  .pillars { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 40px; }
}