:root {
  --black: #000;
  --text: #f2f2f2;
  --gray: #1a1a1a;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, #0d0d0d, #000),
              radial-gradient(circle at 80% 80%, #1a1a1a, transparent),
              linear-gradient(135deg, #0d0d0d, #111 50%, #000);
  background-blend-mode: overlay;
  background-size: 400% 400%;
  animation: moveBackground 25s ease infinite;
  line-height: 1.6;
  padding: 60px 20px;
}

@keyframes moveBackground {
  0% { background-position: 0% 0%, 100% 100%, 0% 50%; }
  50% { background-position: 50% 50%, 50% 0%, 100% 50%; }
  100% { background-position: 100% 100%, 0% 50%, 50% 100%; }
}

.container {
  max-width: 900px;
  margin: 0 auto;
  background: rgba(10, 10, 10, 0.9);
  padding: 40px;
  border-radius: 12px;
  border: 1px solid #1e1e1e;
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.1);
}

h1 {
  font-size: 2.5rem;
  color: var(--accent);
  text-align: center;
  margin-bottom: 20px;
  text-shadow: 0 0 10px var(--accent);
}

h2 {
  font-size: 1.6rem;
  margin-top: 40px;
  margin-bottom: 15px;
  color: var(--text);
  text-shadow: 0 0 6px var(--accent);
}

p, li {
  font-size: 1rem;
  color: #ccc;
  margin-bottom: 12px;
}

ul {
  margin-left: 20px;
  padding-left: 20px;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s;
}

a:hover {
  color: #bfd4d8;
  text-shadow: 0 0 8px var(--accent);
}

.btn-voltar {
  display: inline-block;
  font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  color: #00d4ff;
  background: transparent;
  border: 2px solid #00d4ff;
  border-radius: 8px;
  padding: 12px 28px;
  margin: 32px auto 0 auto;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 0 10px #00d4ff22;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: background 0.25s, color 0.25s, box-shadow 0.25s, transform 0.18s;
}
.btn-voltar:hover, .btn-voltar:focus {
  background: #00d4ff;
  color: #000;
  transform: scale(1.06) translateY(-2px);
  box-shadow: 0 0 20px #00d4ff, 0 4px 24px #00d4ff33;
  outline: none;
}
.btn-voltar::after {
  content: '';
  position: absolute;
  left: 0; top: 0; right: 0; bottom: 0;
  background: linear-gradient(90deg, #00d4ff33 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.btn-voltar:hover::after, .btn-voltar:focus::after {
  opacity: 1;
}

.btn-voltar:hover, .btn-voltar:focus {
  background: #00d4ff;
  color: #000;
  transform: scale(1.06) translateY(-2px);
  box-shadow: 0 0 20px #00d4ff, 0 4px 24px #00d4ff33;
  outline: none;
}
.btn-voltar::after {
  content: '';
  position: absolute;
  left: 0; top: 0; right: 0; bottom: 0;
  background: linear-gradient(90deg, #00d4ff33 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.btn-voltar:hover::after, .btn-voltar:focus::after {
  opacity: 1;
}