*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg-deep);
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

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

.navbar, .nav-links, .mobile-menu, .nav-brand, .nav-cta, .nav-toggle,
.site-footer, .footer-grid, .footer-bottom {
  user-select: none;
  -webkit-user-select: none;
}
a { color: var(--c-primary-light); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: #60a5fa; }

h1, h2, h3, h4 {
  font-family: var(--ff-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

h1 { font-size: var(--fs-4xl); }
h2 { font-size: var(--fs-2xl); }
h3 { font-size: var(--fs-lg); }

@media (min-width: 640px) {
  h1 { font-size: var(--fs-5xl); }
  h2 { font-size: var(--fs-3xl); }
  h3 { font-size: var(--fs-xl); }
}

@media (min-width: 1024px) {
  h1 { font-size: clamp(3rem, 5vw, 4.5rem); }
  h2 { font-size: clamp(2.25rem, 3.5vw, 3.5rem); }
  h3 { font-size: var(--fs-2xl); }
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-4xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-header h2 {
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--c-text) 0%, var(--c-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  color: var(--c-text-secondary);
  max-width: 650px;
  margin: 0 auto;
  font-size: var(--fs-lg);
}
@media (min-width: 1024px) {
  .section-header p {
    font-size: var(--fs-xl);
  }
}

.section-label {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--c-primary-light);
  margin-bottom: var(--space-sm);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-family: var(--ff-body);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.5px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-primary {
  background: linear-gradient(135deg, var(--c-primary) 0%, #1d4ed8 100%);
  color: #fff;
  box-shadow: 0 4px 20px var(--c-primary-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--c-primary-glow);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
}
.btn-outline:hover {
  border-color: var(--c-primary-light);
  color: var(--c-primary-light);
  background: rgba(37, 99, 235, 0.06);
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* Evita seleccionar textos con el mouse o el dedo (los campos de escritura siguen funcionando) */
body { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
input, textarea, select, [contenteditable="true"] { -webkit-user-select: text; user-select: text; }