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

/* Base */
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(
    180deg,
    #0f2027 0%,
    #203a43 50%,
    #2c5364 100%
  );
  color: #f5f5f5;
  min-height: 100vh;
  line-height: 1.6;
}

/* Layout */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

/* Header */
header h1 {
  font-size: 3rem;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.tagline {
  margin-top: 0.5rem;
  font-size: 1.1rem;
  opacity: 0.8;
}

/* Text */
.intro p {
  font-size: 1.05rem;
  margin-bottom: 1rem;
  max-width: 40em;
}

/* Links */
.links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.links a {
  text-decoration: none;
  color: #ffd166;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, opacity 0.2s ease;
}

.links a:hover {
  border-color: #ffd166;
  opacity: 0.85;
}

/* Footer */
footer {
  margin-top: 2rem;
  font-size: 0.9rem;
  opacity: 0.6;
}

/* Mobile */
@media (max-width: 600px) {
  header h1 {
    font-size: 2.4rem;
  }

  .container {
    padding: 3rem 1.2rem;
  }
}

h2 {
  font-size: 1.4rem;
  font-weight: 500;
  margin-bottom: 1rem;
}

.versions ul {
  list-style: none;
  padding-left: 0;
}

.versions li {
  margin-bottom: 0.9rem;
  max-width: 42em;
}

.versions strong {
  color: #ffd166;
  font-weight: 500;
}

.intro a {
  color: #ffd166;
  text-decoration: underline;
}

.intro a:hover {
  opacity: 0.85;
}