:root {
  --bg: #0a0a0a;
  --text: #fff;
  --primary: #ff00ff;
  --secondary: #00ffff;
}

/* Reset básico */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Poppins', sans-serif;
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
}

/* Links */
a {
  color: var(--text);
  text-decoration: none;
  font-family: 'Arial', sans-serif;
  font-weight: bold;
  transition: 0.3s ease;
}

a:hover {
  color: #ffd700;
  text-shadow: 0 0 5px #ffd700;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 20px;
  background: var(--bg);
  position: relative;
  z-index: 100;
}

.header .logo {
  font-size: 1.8rem;
}

.nav {
  display: flex;
  gap: 1rem;
}

/* Menu toggle (hamburger) */
.menu-toggle {
  display: none;
  font-size: 2rem;
  cursor: pointer;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
  padding: 50px 40px;
  background: linear-gradient(180deg, rgba(255,0,255,0.1) 0%, rgba(0,0,0,1) 100%);
}

.cards .card {
  display: block;
  background: #111;
  color: var(--text);
  padding: 35px 30px;
  margin: 10px 0;
  border-radius: 15px;
  font-family: 'Arial', sans-serif;
  font-weight: bold;
  font-size: 1.3rem;
  text-align: center;
  text-transform: uppercase;
  box-shadow: 0 0 15px rgba(255, 0, 255, 0.3);
  border: 2px solid transparent;
  background-clip: padding-box;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.cards .card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 15px;
  padding: 2px;
  background: linear-gradient(45deg, var(--primary), var(--secondary));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}

.cards .card:hover {
  background: #1a001a;
  transform: scale(1.07);
  box-shadow: 0 0 25px var(--primary), 0 0 50px var(--secondary);
  color: #ffd700;
}

.cards .card:hover::before {
  background: linear-gradient(45deg, var(--secondary), var(--primary));
}

/* Hero */
.hero {
  text-align: center;
  padding: 60px 20px;
}

.hero button {
  margin: 10px;
  padding: 12px 20px;
  border: none;
  cursor: pointer;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #000;
  font-weight: bold;
  transition: 0.3s;
}

.hero button:hover {
  transform: scale(1.05);
}

/* Responsivo */
@media (max-width: 768px) {
  .nav {
    display: none;
    flex-direction: column;
    gap: 15px;
    position: absolute;
    top: 60px;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    background: var(--bg);
    padding: 1rem 2rem;
    text-align: center;
    z-index: 99;
    border-radius: 10px;
  }

  .nav a {
    display: inline-block;
    font-size: 1.2rem;
    position: relative;
    padding: 5px 0;
    transition: color 0.3s;
  }

  .nav.active {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .cards {
    grid-template-columns: 1fr;
    padding: 25px;
    gap: 20px;
  }

  .cards .card {
    font-size: 1.1rem;
    padding: 30px;
    box-shadow: 0 0 15px var(--primary);
  }
}