:root {
  --bg-light: linear-gradient(135deg, #f5f7fa, #e8ecf3);
  --bg-dark: linear-gradient(135deg, #1c1f24, #111317);

  --card-light: rgba(255, 255, 255, 0.65);
  --card-dark: rgba(0, 0, 0, 0.35);

  --text-light: #222;
  --text-dark: #e6e6e6;

  --accent: #4a7bd0;
  --accent-dark: #7aa7ff;
}

body {
  margin: 0;
  padding: 0;
  font-family: "IBM Plex Sans", sans-serif;
  background: var(--bg-light);
  color: var(--text-light);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  animation: fadeIn 1.2s ease;
}

@media (prefers-color-scheme: dark) {
  body {
    background: var(--bg-dark);
    color: var(--text-dark);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  text-align: center;
  padding: 50px 40px;
  background: var(--card-light);
  backdrop-filter: blur(14px);
  border-radius: 20px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.06);
  max-width: 440px;
  animation: float 6s ease-in-out infinite;
}

@media (prefers-color-scheme: dark) {
  .card {
    background: var(--card-dark);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.4);
  }
}

@keyframes float {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
  100% {
    transform: translateY(0);
  }
}

h1 {
  font-size: 3rem;
  margin-bottom: 0.4rem;
  letter-spacing: -1px;
  font-weight: 600;
}

.accent-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  margin-left: 6px;
  animation: pop 1.8s ease-in-out infinite;
}

@media (prefers-color-scheme: dark) {
  .accent-dot {
    background: var(--accent-dark);
  }
}

@keyframes pop {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.4);
  }
}

p {
  margin: 0.6rem 0;
  font-size: 1.1rem;
  font-weight: 300;
}

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding-bottom: 2px;
  transition: color 0.25s ease;
}

@media (prefers-color-scheme: dark) {
  a {
    color: var(--accent-dark);
  }
}

a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 2px;
  background: currentColor;
  transition: width 0.25s ease;
}

a:hover::after {
  width: 100%;
}