body {
  margin: 0;
  padding: 0;
  height: 100vh;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0)),
    url("background.avif") no-repeat center center fixed;
  background-size: cover;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: "SF Pro", "Helvetica Neue", sans-serif;
  color: #e0e0e0;
}

.container {
  position: relative;

  text-align: center;
  padding: 2rem;
  max-width: 500px;
  width: 90%;

  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.3);

  box-shadow: inset 2px 6px 8px rgba(255, 255, 255, 0.5),
    inset -2px -6px 8px rgba(0, 0, 0, 0.25), 0 10px 20px rgba(0, 0, 0, 0.3),
    -2px -4px 10px rgba(255, 255, 255, 0.15),
    0 0 0 1px rgba(255, 255, 255, 0.05);
}

.container::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 10px;
  width: 35%;
  height: 35%;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 50%;
  filter: blur(10px);
  pointer-events: none;
}

header h1 {
  font-size: 2.5rem;
  color: #ffffff;
  margin-bottom: 1.5rem;
  letter-spacing: 0.5px;
}

.link-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.link-list li {
  margin: 1rem 0;
}

.link-list a.rune-calculator {
  position: relative;
  display: inline-block;
  color: #fff;
  background: rgba(255, 140, 0, 0.35);
  padding: 0.75rem 1.8rem;
  border-radius: 20px;
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  border: 1.5px solid rgba(255, 140, 0, 0.6);

  box-shadow: inset 2px 6px 8px rgba(255, 200, 100, 0.7),
    inset -2px -6px 8px rgba(180, 90, 0, 0.35),
    0 10px 20px rgba(180, 90, 0, 0.4), -2px -4px 10px rgba(255, 180, 80, 0.25);

  transition: all 0.3s ease;
}

.link-list a.rune-calculator:hover {
  background: rgba(255, 140, 0, 0.3);
  box-shadow: inset 3px 8px 10px rgba(255, 220, 120, 0.9),
    inset -3px -8px 10px rgba(200, 110, 10, 0.5),
    0 14px 30px rgba(200, 110, 10, 0.6),
    -3px -6px 14px rgba(255, 200, 100, 0.35);
  transform: translateY(-3px);
  color: #fff;
}

.link-list a.rune-calculator::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 8px;
  width: 35%;
  height: 35%;
  background: rgba(255, 200, 100, 0.3);
  border-radius: 50%;
  filter: blur(10px);
  pointer-events: none;
}