:root {
  --bg: #f9f9f9;
  --ink: #222;
  --ink-soft: #555;
  --brand: #000;
  --card: #fff;
  --muted: #eee;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(0,0,0,.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

/* Layout */
.container { width: min(1100px, 92%); margin: 0 auto; }

/* Header y navegación */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: var(--card); border-bottom: 1px solid #ddd;
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 0.8rem 0; }
.logo { text-decoration: none; color: var(--brand); font-weight: 800; letter-spacing: .5px; }

.menu-btn {
  display: none; border: 1px solid #ccc; background: var(--card);
  padding: .4rem .6rem; border-radius: 8px; cursor: pointer;
}

.nav-links { display: flex; gap: 1rem; }
.nav-links a {
  text-decoration: none; color: var(--ink-soft); padding: .4rem .6rem; border-radius: 8px;
}
.nav-links a:hover, .nav-links a.active { background: var(--muted); color: var(--ink); }

/* Secciones */
.section { padding: 4.5rem 0; }
.section.alt { background: #f4f4f4; }

.hero {
  background: linear-gradient(180deg, #ffffff, #f2f2f2);
  text-align: center;
  padding: 6rem 0 5rem;
}
.hero h1 { font-size: clamp(1.8rem, 2.8vw, 3rem); margin: 0 0 .6rem; }
.hero p { color: var(--ink-soft); margin: 0 0 1.2rem; }

.bullets { margin: 1rem 0 0; padding: 0 1rem; }
.bullets li { margin: .4rem 0; }

/* Botones y tarjetas */
.btn {
  display: inline-block; border: 0; border-radius: 10px; padding: .8rem 1.2rem;
  background: var(--brand); color: #fff; text-decoration: none; cursor: pointer;
}
.btn:hover { filter: brightness(.9); }

.grid { display: grid; gap: 1rem; grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--card); border-radius: var(--radius); padding: 1rem 1.2rem; box-shadow: var(--shadow);
}
.team .member { background: var(--card); border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow); }

/* Formulario */
.form { display: grid; gap: .8rem; max-width: 520px; }
.form input, .form textarea {
  width: 100%; padding: .8rem 1rem; border-radius: 10px; border: 1px solid #ccc; background: #fff;
}
.form-msg { margin-top: .6rem; color: green; }
.oculto { display: none; }

/* Footer */
.site-footer { border-top: 1px solid #ddd; padding: 1.4rem 0; background: var(--card); }
.site-footer p { margin: 0; }
.back-top { text-decoration: none; margin-left: 1rem; color: var(--ink-soft); }
.back-top:hover { color: var(--ink); }

/* Responsive */
@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr; }
  .menu-btn { display: inline-block; }
  .nav-links {
    position: absolute; right: 4%; top: 64px; background: var(--card);
    border: 1px solid #ddd; border-radius: 12px; padding: .6rem;
    display: none; flex-direction: column; gap: .4rem; box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
}

/* Animaciones suaves al hacer scroll */
.reveal { 
  opacity: 0; 
  transform: translateY(14px); 
  transition: opacity .6s ease, transform .6s ease; 
}
.reveal.visible { 
  opacity: 1; 
  transform: translateY(0); 
}

/* Entrada hero más agradable */
.hero .container { 
  animation: fadeUp .8s ease both; 
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Estilo de la frase */
.frase {
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  color: var(--ink-soft);
  margin: .6rem 0 1rem;
}