:root {
  --bg: #0c1118;
  --bg-2: #121924;
  --panel: #161e2b;
  --panel-2: #1c2636;
  --line: rgba(215, 221, 230, 0.12);
  --text: #eef2f6;
  --muted: #9aa6b6;
  --accent: #e0a106;
  --accent-dim: rgba(224, 161, 6, 0.14);
  --ok: #7dcea0;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  --radius: 18px;
  --max: 1120px;
  --sans: "Sora", "Segoe UI", sans-serif;
  --serif: "Source Serif 4", Georgia, serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  letter-spacing: -0.01em;
}

img { max-width: 100%; }
a { color: inherit; }

.wrap {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(12, 17, 24, 0.84);
  border-bottom: 1px solid var(--line);
}

.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.mark {
  width: 36px;
  height: 36px;
  display: grid;
  gap: 3px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #0a0f16;
}

.mark i {
  display: block;
  height: 5px;
  border-radius: 2px;
}
.mark i:nth-child(1) { background: var(--accent); }
.mark i:nth-child(2) { background: #d7dde6; }
.mark i:nth-child(3) { background: #6b7787; }

.brand strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
}
.brand small {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 400;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.9rem;
}

.nav a:hover { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  border-radius: 999px;
  padding: 12px 18px;
  font: inherit;
  font-weight: 600;
  font-size: 0.92rem;
}

.btn-gold {
  background: var(--accent);
  color: #1a1303;
}
.btn-gold:hover { filter: brightness(1.05); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}
.btn-ghost:hover { border-color: #4a5568; }

.menu-btn {
  display: none;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
}

.hero {
  padding: 72px 0 56px;
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(224, 161, 6, 0.16), transparent 55%),
    linear-gradient(180deg, #101826 0%, var(--bg) 100%);
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.kicker::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--accent);
}

h1, h2, h3 { margin: 0 0 12px; letter-spacing: -0.03em; }
h1 {
  font-family: var(--serif);
  font-size: clamp(2.1rem, 5vw, 4rem);
  line-height: 1.08;
  font-weight: 500;
  max-width: 18ch;
}
h2 {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  font-weight: 500;
}
.lead {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 58ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 36px;
}

.facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.fact {
  background: rgba(22, 30, 43, 0.75);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
}
.fact b {
  display: block;
  font-size: 1.35rem;
  font-weight: 600;
}
.fact span {
  color: var(--muted);
  font-size: 0.82rem;
}

section { padding: 72px 0; }
.section-head { margin-bottom: 28px; max-width: 62ch; }
.section-head p { color: var(--muted); }

.grid-3, .grid-2 {
  display: grid;
  gap: 16px;
}
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.card h3 { font-size: 1.15rem; font-weight: 600; }
.card p, .card li { color: var(--muted); }
.card ol, .card ul { margin: 0; padding-left: 18px; }

.problem {
  background: var(--bg-2);
  border-block: 1px solid var(--line);
}

.layers {
  display: grid;
  gap: 14px;
}
.layer {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 18px;
  align-items: start;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}
.layer-n {
  font-family: var(--serif);
  font-size: 2rem;
  color: var(--accent);
  line-height: 1;
}
.layer h3 { margin-bottom: 6px; }

.steps { counter-reset: paso; }
.step {
  position: relative;
  padding-left: 0;
}
.step b {
  display: block;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.about {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 22px;
  align-items: start;
}
.about p { color: var(--muted); }
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.chip {
  border: 1px solid var(--line);
  background: var(--panel-2);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.78rem;
  color: #c9d2de;
}

.contact-box {
  background:
    linear-gradient(180deg, rgba(224, 161, 6, 0.08), transparent 40%),
    var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 28px;
}
.contact-list {
  display: grid;
  gap: 10px;
  margin: 20px 0 24px;
}
.contact-list a {
  text-decoration: none;
  color: var(--text);
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #121925;
}
.contact-list a span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
}

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 0.85rem;
}
.foot {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.note {
  margin-top: 18px;
  font-size: 0.82rem;
  color: var(--muted);
}

@media (max-width: 860px) {
  .nav { display: none; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #101722;
    border-bottom: 1px solid var(--line);
    padding: 16px;
    align-items: flex-start;
  }
  .menu-btn { display: inline-flex; }
  .facts, .grid-3, .grid-2, .about { grid-template-columns: 1fr; }
  .layer { grid-template-columns: 1fr; }
  h1 { max-width: none; }
  .hero { padding-top: 40px; }
}