:root {
  --bg-color: #0d1117;
  --text-color: #c9d1d9;
  --accent-color: #58a6ff;
  --card-bg: #161b22;
  --border-color: #30363d;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  padding: 2rem;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--card-bg);
}

h1 {
  margin: 0;
  font-size: 2.5rem;
  background: -webkit-linear-gradient(#58a6ff, #1f6feb);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeIn 1s ease-out;
}

.tagline {
  font-size: 1.2rem;
  color: #8b949e;
  margin-top: 0.5rem;
  animation: slideUp 1s ease-out;
}

main {
  flex: 1;
  padding: 2rem;
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  animation: fadeIn 1.2s ease-out;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  border-color: var(--accent-color);
}

.card h2 {
  color: var(--accent-color);
  margin-top: 0;
}

.btn {
  display: inline-block;
  background-color: #238636;
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  border: 1px solid rgba(240,246,252,0.1);
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.2s;
  text-decoration: none;
  margin-top: 1rem;
}

.btn:hover {
  background-color: #2ea043;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

#auth-section {
  text-align: center;
  padding: 2rem;
  margin-top: 2rem;
}