:root{
  --bg: #0f172a;            /* slate-900 */
  --fg: #e5e7eb;            /* gray-200  */
  --muted: #a1a1aa;         /* zinc-400  */

  --brand: #22d3ee;         /* cyan-400  */
  --brand-600: #0891b2;     /* cyan-700  */

  --card: #111827;          /* gray-900  */
  --card-border: #1f2937;   /* gray-800  */

  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 20px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin: 0;
  font-family: "Montserrat", system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Helvetica Neue", sans-serif;
  background: radial-gradient(1200px 700px at 20% -10%, #0b1225 0%, var(--bg) 55%);
  color: var(--fg);
  line-height: 1.5;
}

/* Header */
.site-header{
  width: 100%;
  padding: 20px clamp(20px, 5vw, 48px);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--card-border);
  backdrop-filter: blur(6px);
}
.brand{
  display: grid;
  grid-auto-flow: column;
  align-items: center;
  gap: 12px;
}
.brand__logo{
  display: block;
  height: auto;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,.25));
}
.brand__name{
  font-weight: 700;
  letter-spacing: .2px;
  font-size: clamp(14px, 2vw, 18px);
  color: var(--fg);
  opacity: .9;
}

/* Main */
.main{
  min-height: calc(100vh - 150px);
  display: grid;
  place-items: center;
  padding: clamp(24px, 5vw, 56px);
}
.hero{
  width: min(100%, 980px);
  text-align: center;
  background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,0));
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: clamp(28px, 6vw, 64px);
  box-shadow: var(--shadow);
}
.hero h1{
  margin: 0 0 6px;
  font-size: clamp(26px, 4vw, 40px);
  letter-spacing: .3px;
}
.hero__subtitle{
  margin: 0 auto clamp(28px, 4vw, 44px);
  color: var(--muted);
  max-width: 50ch;
  font-size: clamp(14px, 2.2vw, 16px);
}

/* Grid de botones */
.cta-grid{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2.5vw, 22px);
}
@media (max-width: 720px){
  .cta-grid{ grid-template-columns: 1fr; }
}

/* Botones */
.btn{
  --btn-bg: var(--card);
  --btn-bd: var(--card-border);

  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px 16px;

  text-decoration: none;
  color: var(--fg);
  background: var(--btn-bg);
  border: 1px solid var(--btn-bd);
  border-radius: calc(var(--radius) - 2px);

  padding: clamp(16px, 2.5vw, 24px) clamp(16px, 3vw, 28px);
  box-shadow: 0 1px 0 rgba(255,255,255,.04) inset, var(--shadow);
  transform: translateZ(0);
  will-change: transform, box-shadow;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background-color .18s ease;
}
.btn__title{
  font-weight: 700;
  font-size: clamp(16px, 2.6vw, 20px);
}
.btn__subtitle{
  grid-column: 1 / -1;
  text-align: left;
  color: var(--muted);
  font-size: clamp(12px, 2.2vw, 14px);
  margin-top: -2px;
}
.btn__icon{
  width: clamp(22px, 2.8vw, 26px);
  height: clamp(22px, 2.8vw, 26px);
  opacity: .9;
}

.btn:hover,
.btn:focus-visible{
  transform: translateY(-3px);
  box-shadow: 0 14px 40px rgba(0,0,0,.45);
  border-color: #2a2f3b;
  outline: none;
}

.btn--primary{
  --btn-bg: linear-gradient(180deg, rgba(34,211,238,.12), rgba(8,145,178,.08));
  --btn-bd: rgba(34,211,238,.35);
}
.btn--primary:hover,
.btn--primary:focus-visible{
  background: linear-gradient(180deg, rgba(34,211,238,.16), rgba(8,145,178,.16));
}

.btn--outline{
  background: transparent;
  border-style: dashed;
}
.btn--outline:hover,
.btn--outline:focus-visible{
  background: rgba(255,255,255,.03);
}

/* Footer */
.site-footer{
  padding: 24px;
  text-align: center;
  color: var(--muted);
  border-top: 1px solid var(--card-border);
  font-size: 13px;
}