:root {
  --accent: #3bf2bf;
  --bg-start: #060b25;
  --bg-end: #0e1e5b;
  --surface-bg: rgba(255, 255, 255, 0.94);
  --text-main: #0f172a;
  --text-muted: #475569;
  --border-radius: 16px;
  --transition: 0.3s ease;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

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

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: 'Poppins', sans-serif;
  color: var(--text-main);
  background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 700;
  color: #fff;
}

a {
  color: #2bbfd0;
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover,
a:focus {
  color: #2a2763;
  text-decoration: underline;
}

.panel, .card {
  background: var(--surface-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  transition: var(--transition);
}
.panel:hover, .card:hover {
  transform: translateY(-2px);
}

button, .btn {
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
button:hover, .btn:hover {
  background: #2adfb0;
  transform: translateY(-1px);
}

footer {
  text-align: center;
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.9rem;
  padding: 2rem 0;
}

main {
  padding: 2rem;
}