:root {
  --bg-app: #F8FAFC;
  --bg-card: #FFFFFF;
  --text-main: #0F172A;
  --text-muted: #64748B;
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --border: #E2E8F0;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

header {
  text-align: center;
  padding: 4rem 0 3rem;
}

.title {
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary) 0%, #818CF8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.downloads-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2.5rem;
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), #818CF8);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

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

.card-icon {
  width: 64px;
  height: 64px;
  background-color: rgba(79, 70, 229, 0.1);
  color: var(--primary);
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.card-icon svg {
  width: 32px;
  height: 32px;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.card-desc {
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--primary);
  color: #ffffff;
  text-decoration: none;
  padding: 0.85rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: background-color 0.2s ease, transform 0.1s ease;
  width: 100%;
}

.btn:hover {
  background-color: var(--primary-hover);
}

.btn:active {
  transform: scale(0.98);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--border);
  margin-top: 1rem;
}

.btn-secondary:hover {
  background-color: rgba(0,0,0,0.05);
}


footer {
  margin-top: auto;
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
  .title {
    font-size: 2rem;
  }
}