:root {
  --bg: #0b0d10;
  --bg-alt: #14171c;
  --border: #23272e;
  --text: #e8e9ea;
  --text-dim: #a3a9b3;
  --accent: #2fd6d6;
  --accent-dim: #1a9e9e;
  --danger: #ff5470;
  --radius: 10px;
  --maxw: 960px;
  font-size: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header / navegación */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(11, 13, 16, 0.9);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(6px);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.04em;
  font-size: 1.15rem;
  color: var(--text);
  text-transform: uppercase;
}
.brand:hover { text-decoration: none; color: var(--accent); }

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

.main-nav a {
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--accent);
  text-decoration: none;
}

.main-nav a.nav-secondary {
  color: var(--text);
  border: 1px solid var(--accent-dim);
  padding: 6px 14px;
  border-radius: 999px;
}
.main-nav a.nav-secondary:hover {
  background: var(--accent);
  color: #04211f;
}

/* Hero / secciones */
.hero, .section {
  padding: 64px 0;
  border-bottom: 1px solid var(--border);
}

.kicker {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 700;
  margin: 0 0 10px;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  margin: 0 0 18px;
  line-height: 1.15;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin: 0 0 16px;
}

.lead {
  font-size: 1.1rem;
  color: var(--text-dim);
  max-width: 70ch;
}

p { max-width: 70ch; }

.actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 999px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-size: 0.9rem;
}

.btn-primary {
  background: var(--accent);
  color: #04211f;
}
.btn-primary:hover { background: #45e4e4; text-decoration: none; }

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* Tarjetas / grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 32px;
}

.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.card h3 { margin-top: 0; font-size: 1.1rem; }
.card p { color: var(--text-dim); font-size: 0.95rem; margin-bottom: 0; }

/* Footer */
.site-footer {
  padding: 48px 0 32px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.footer-grid h4 {
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.85rem;
  margin: 0 0 12px;
}

.footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-grid li { margin-bottom: 8px; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  font-size: 0.82rem;
}

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: color 0.2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--accent);
  transition: transform 0.25s;
}
.faq-item summary:hover { color: var(--accent); }
.faq-item summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item p {
  color: var(--text-dim);
  margin: 0;
  padding: 0 0 22px;
  animation: faq-open 0.25s ease;
}
@keyframes faq-open {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* Formulario de registro */
form.registro {
  margin-top: 32px;
  max-width: 560px;
}

.form-step {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  margin-bottom: 18px;
}

.form-step[hidden] { display: none; }

.form-step h3 {
  margin-top: 0;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin: 16px 0 6px;
}

input[type="text"],
input[type="email"],
input[type="tel"],
select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 0.95rem;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
}

.checkbox-row, .radio-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 14px 0;
}

.checkbox-row input, .radio-row input {
  margin-top: 4px;
}

.checkbox-row label, .radio-row label {
  margin: 0;
  font-weight: 400;
  font-size: 0.9rem;
}

.interest-grid, .role-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px;
  margin-top: 10px;
}

.form-note {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-top: 24px;
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 20px;
  flex-wrap: wrap;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
}

.confirmation {
  background: var(--bg-alt);
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
  padding: 26px;
  margin-top: 32px;
}
.confirmation[hidden] { display: none; }

@media (max-width: 640px) {
  .main-nav { gap: 14px; }
  .hero, .section { padding: 44px 0; }
}

.form-error { color: var(--danger); font-weight: 600; margin: 16px 0 0; }