:root{
  --bg: #f8f9fb;
  --card: #ffffff;
  --accent: #2f80ed;
  --muted: #000000;
  --shadow: 0 6px 18px rgba(16,24,40,0.06);
  --footer-height: 56px;

  /* Colores por tarjeta */
  --regex-color: #2563eb;   /* Azul */
  --fechas-color: #16a34a;  /* Verde */
  --kanban-color: #f97316;  /* Naranja */
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, Roboto, "Segoe UI", Arial, sans-serif;
  background:var(--bg);
  color:#111827;
  display:flex;
  flex-direction:column;
  min-height:100vh;
}

/* header */
.site-header{
  padding:24px;
  text-align:center;
  border-bottom:1px solid #b6c1d6;
  background:linear-gradient(90deg, #ff0000, #ff0000);
}
.site-header h1{margin:0;font-size:1.4rem}
.subtitle{margin:6px 0 0;color:var(--muted);font-size:0.95rem}

/* main */
.site-main{
  flex:1;
  padding:36px 20px;
  display:flex;
  align-items:flex-start;   /* tarjetas arriba */
  justify-content:center;
}
.cards{
  display:grid;
  gap:24px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  width:100%;
  max-width:1100px;
  margin-top:40px;          /* espacio fijo debajo del header */
}

/* card */
.card{
  background:var(--card);
  padding:28px;
  min-height:220px;
  border-radius:16px;
  box-shadow:var(--shadow);
  border:1px solid rgba(15,23,42,0.03);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover{
  transform: translateY(-4px);
  box-shadow:0 8px 20px rgba(16,24,40,0.12);
}

/* Borde superior de color por tarjeta */
.card.regex{ border-top:6px solid var(--regex-color); }
.card.fechas{ border-top:6px solid var(--fechas-color); }
.card.kanban{ border-top:6px solid var(--kanban-color); }

.card h2{
  margin:0;
  font-size:1.35rem;
  text-align:center;
}

.card p{
  margin:0;
  color:var(--muted);
  font-size:1rem;
  text-align:center;
  flex:1;
}

/* Botón base */
.btn{
  display:inline-block;
  text-decoration:none;
  color:white;
  padding:12px 16px;
  border-radius:10px;
  font-weight:600;
  text-align:center;
  transition: background 0.2s;
  width:100%;
  max-width:200px;
}

/* Botones personalizados */
.card.regex .btn{
  background:var(--regex-color);
}
.card.regex .btn:hover{
  background:#1e40af;
}
.card.fechas .btn{
  background:var(--fechas-color);
}
.card.fechas .btn:hover{
  background:#15803d;
}
.card.kanban .btn{
  background:var(--kanban-color);
}
.card.kanban .btn:hover{
  background:#c2410c;
}

/* footer */
.site-footer{
  position:fixed;
  left:0;right:0;bottom:0;
  height:var(--footer-height);
  background:#011331;
  color:#d1d5db;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  font-size:0.9rem;
  padding:0 20px;
  box-shadow:0 -4px 12px rgba(2,6,23,0.2);
}

.site-main{padding-bottom:calc(var(--footer-height) + 24px);}

@media (max-width:520px){
  .site-header h1{font-size:1.1rem}
  .cards{grid-template-columns:1fr}
}