:root {
  --bg-color: #0d0d10;
  --surface-color: #1a1a20;
  --text-primary: #ededed;
  --text-secondary: #a0a0b0;
  --accent-primary: #8AB4F8; /* Soft blue */
  --accent-secondary: #c58af9; /* Soft purple */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition-speed: 0.3s;
}

body {
  margin: 0;
  padding: 0;
  font-family: --font-main;
  background-color: var(--bg-color);
  color: var(--text-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  overflow-x: hidden;
}

.container {
  max-width: 800px;
  width: 90%;
  padding: 2rem;
  text-align: center;
  animation: fadeIn 1s ease-out;
}

h1 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
  letter-spacing: -0.05rem;
}

p.subtitle {
  color: var(--text-secondary);
  font-size: 1.2rem;
  margin-bottom: 3rem;
  font-weight: 300;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  justify-content: center;
}

.card {
  background-color: var(--surface-color);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed);
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
  border-color: rgba(255, 255, 255, 0.1);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  opacity: 0;
  transition: opacity var(--transition-speed);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  opacity: 0.8;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Specific styling for external vs download links if needed, 
   but unified card look is often cleaner. */

footer {
  margin-top: 4rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  opacity: 0.6;
}

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

@media (max-width: 600px) {
  h1 { font-size: 2.5rem; }
  .container { width: 95%; padding: 1rem; }
}