* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background: #0f172a;
  color: white;
}

/* HERO */
.hero {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.hero h1 {
  font-size: 4rem;
}

/* BOTÓN */
.btnIndex {
  margin-top: 20px;
  padding: 12px 30px;
  border: 1px solid white;
  text-decoration: none;
  color: white;
  transition: 0.3s;
}

.btnIndex:hover {
  background: white;
  color: #0f172a;
}

/* === PREVIEW DEL SISTEMA === */
.preview{
  padding:80px 10%;
  text-align:center;
}

.preview h2{
  font-size:2rem;
  margin-bottom:30px;
}

.preview ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:20px;
}

.preview li{
  background:#1e293b;
  padding:15px 25px;
  border-radius:10px;
  font-size:1rem;
}

/* FEATURES */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 30px;
  padding: 80px;
}

.feature {
  background: #1e293b;
  padding: 30px;
  border-radius: 12px;
  transition: 0.3s;
}

.feature:hover {
  transform: translateY(-4px);
}

/* CHARTS GRID */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.chart-card {
  background: #1e293b;
  padding: 25px;
  border-radius: 14px;
}

.chart-card h3 {
  margin-bottom: 15px;
  font-size: 1.1rem;
  color: #e5e7eb;
}

/* STATS */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.stat-card {
  background: #1e293b;
  padding: 24px;
  border-radius: 14px;
  text-align: center;
}

.stat-card h4 {
  font-size: 14px;
  color: #94a3b8;
  margin-bottom: 8px;
}

.stat-card p,
.stat-card span {
  font-size: 2rem;
  font-weight: bold;
  display: block;
}