/* ============================= */
/* RESET */
/* ============================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: #050505;
  color: #ffffff;
  line-height: 1.6;
  overflow-x: hidden;
  padding-top: 80px; /* espacio para navbar fixed */
}

/* ============================= */
/* NAVBAR */
/* ============================= */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(5,5,5,0.95);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 30px; /* reducido para que no se salga */
  z-index: 1000;
  border-bottom: 1px solid rgba(255,0,0,0.2);
}

.navbar .logo {
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 1rem;
  color: white;
}

.navbar ul {
  list-style: none;
  display: flex;
  gap: 25px; /* menos separación */
  flex-wrap: wrap; /* permite que bajen si no entran */
}

.navbar ul li a {
  text-decoration: none;
  color: #ccc;
  font-weight: 500;
  transition: 0.3s;
  position: relative;
}

.navbar ul li a:hover {
  color: #ff1a1a;
}

.navbar ul li a::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0%;
  height: 2px;
  background: #c40000;
  transition: 0.3s;
}

.navbar ul li a:hover::after {
  width: 100%;
}

/* ============================= */
/* HERO */
/* ============================= */
.hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 50px;
  text-align: left;
  min-height: 100vh;
  position: relative;
}

.hero-left {
  flex: 1;
  z-index: 2;
}

.hero-right {
  flex: 1.3;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero .mockup {
  width: 100%;
  max-width: 500px; /* controlado para que no quede gigante */
  height: auto;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.6);
}

.hero h1 {
  font-size: 3.2rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 900;
  color: #ffffff;
  text-shadow: 0 4px 25px rgba(0,0,0,0.9);
}

.subtitle {
  margin: 25px 0;
  font-size: 1.3rem;
  color: #e0e0e0;
}

/* Estándar Internacional */
#estandar .mockup {
  width: 100%;
  max-width: 400px;  /* más grande que el hero */
  height: auto;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.6);
}

/* BOTÓN PRINCIPAL */
.btn-primary {
  display: inline-block;
  padding: 15px 30px;
  background: linear-gradient(90deg, #c40000, #ff1a1a);
  color: #fff;
  font-weight: bold;
  text-decoration: none;
  border-radius: 8px;
  transition: 0.3s;
  box-shadow: 0 0 20px rgba(255,0,0,0.6);
}

.btn-primary:hover {
  transform: scale(1.05);
  background: linear-gradient(90deg, #ff1a1a, #c40000);
}

/* ============================= */
/* GRILLAS */
/* ============================= */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
  margin-top: 40px;
}

.two-columns {
  display: grid;
  grid-template-columns: 1fr 1.4fr; /* más espacio para la imagen */
  gap: 40px;
  align-items: center;
}

.two-columns img.mockup {
  width: 100%;
  max-width: 800px; /* más grande que el hero */
  height: auto;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.6);
}

.checklist {
  list-style: none;
  margin-top: 20px;
  text-align: left;
}

.checklist li {
  margin: 10px 0;
  color: #ccc;
  font-size: 1.1rem;
}

/* ============================= */
/* SECCIONES */
/* ============================= */
.section {
  padding: 100px 20px;
  max-width: 1200px;
  margin: auto;
  text-align: center;
}

.section h2 {
  font-size: 2.2rem;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.section p {
  color: #cccccc;
}

/* ============================= */
/* SERVICIOS */
/* ============================= */
.card {
  background: linear-gradient(145deg, #0e0e0e, #141414);
  padding: 40px 30px;
  border-radius: 16px;
  border: 1px solid #1f0000;
  transition: 0.4s ease;
}

.card:hover {
  transform: translateY(-10px);
  border-color: #c40000;
  box-shadow: 0 15px 40px rgba(196,0,0,0.25);
}

.card h3 {
  margin-bottom: 15px;
  font-size: 1.3rem;
}

.card p {
  color: #aaaaaa;
}

.card-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 20px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.4);
}

/* ============================= */
/* CONTACTO */
/* ============================= */
.contacto {
  background: linear-gradient(135deg, #050505, #1a0000);
  padding: 100px 20px;
  text-align: center;
}

.contact-text {
  font-size: 1.2rem;
  margin-bottom: 25px;
  color: #cccccc;
}

.email-box {
  display: inline-block;
  padding: 20px 40px;
  background: linear-gradient(90deg, #8b0000, #c40000);
  color: white;
  text-decoration: none;
  font-size: 1.4rem;
  font-weight: bold;
  border-radius: 10px;
  transition: all 0.3s ease;
  box-shadow: 0 0 25px rgba(196,0,0,0.6);
}

.email-box:hover {
  transform: scale(1.08);
  background: linear-gradient(90deg, #c40000, #ff1a1a);
  box-shadow: 0 0 40px rgba(255,0,0,0.9);
}

.contact-note {
  margin-top: 30px;
  color: #888888;
  font-size: 0.95rem;
}

/* ============================= */
/* FOOTER */
/* ============================= */
footer {
  background: #000;
  padding: 30px;
  text-align: center;
  font-size: 0.9rem;
  color: #666;
  border-top: 1px solid #1a0000;
}

/* ============================= */
/* BOTÓN VOLVER ARRIBA */
/* ============================= */
#btn-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 45px;
  height: 45px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(90deg, #c40000, #ff1a1a);
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 0 15px rgba(255,0,0,0.6);
  display: none;
  transition: all 0.3s ease;
  z-index: 1100;
}

#btn-top:hover {
  transform: scale(1.1);
  box-shadow: 0 0 25px rgba(255,0,0,0.9);
}

/* ============================= */
/* RESPONSIVE */
/* ============================= */
@media (max-width: 900px) {
  .navbar {
    padding: