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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background: #0D1117;
  color: #E6EDF3;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

main {
  max-width: 42rem;
  width: 100%;
  padding: 2rem 1.5rem;
}

/* Cover image */
.cover {
  text-align: center;
  margin-bottom: 2rem;
}

.cover img {
  max-width: 280px;
  width: 100%;
  height: auto;
  border-radius: 4px;
}

/* Title block */
.title-block {
  text-align: center;
  margin-bottom: 2.5rem;
}

.title-block h1 {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  margin-bottom: 0.3rem;
}

.title-block .subtitle {
  font-style: italic;
  color: #8B949E;
  font-size: 1.05rem;
  margin-bottom: 0.8rem;
}

.title-block .authors {
  color: #8B949E;
  font-size: 0.95rem;
}

/* Section headings */
h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
  color: #E6EDF3;
}

/* Hook paragraph */
.hook {
  margin-bottom: 2.5rem;
  font-size: 1.05rem;
  line-height: 1.7;
}

/* Three possibilities */
.possibilities {
  margin-bottom: 2.5rem;
}

.possibility {
  margin-bottom: 1.2rem;
  padding-left: 1rem;
  border-left: 3px solid #8B949E;
}

.possibility.track-a { border-color: #2D9B96; }  /* teal */
.possibility.track-b { border-color: #D4A04A; }  /* amber */
.possibility.track-c { border-color: #8B6FC0; }  /* violet */

.possibility strong {
  display: block;
  margin-bottom: 0.2rem;
}

.possibility.track-a strong { color: #2D9B96; }
.possibility.track-b strong { color: #D4A04A; }
.possibility.track-c strong { color: #8B6FC0; }

/* Downloads */
.downloads {
  margin-bottom: 2.5rem;
  text-align: center;
}

.download-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 0.8rem;
}

.download-buttons a {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  border: 1px solid #30363D;
  border-radius: 6px;
  color: #E6EDF3;
  text-decoration: none;
  font-size: 0.95rem;
  transition: border-color 0.15s;
}

.download-buttons a:hover {
  border-color: #58A6FF;
}

.download-buttons .primary {
  background: #1F6FEB;
  border-color: #1F6FEB;
}

.download-buttons .primary:hover {
  background: #388BFD;
  border-color: #388BFD;
}

/* License and contact */
.meta {
  margin-bottom: 2rem;
  font-size: 0.9rem;
  color: #8B949E;
  line-height: 1.7;
}

.meta a {
  color: #58A6FF;
  text-decoration: none;
}

.meta a:hover {
  text-decoration: underline;
}

/* Footer */
footer {
  width: 100%;
  max-width: 42rem;
  padding: 1.5rem;
  border-top: 1px solid #21262D;
  text-align: center;
  font-size: 0.85rem;
  color: #484F58;
}

/* Mobile adjustments */
@media (max-width: 480px) {
  .title-block h1 {
    font-size: 1.8rem;
    letter-spacing: 0.1em;
  }

  .cover img {
    max-width: 200px;
  }

  main {
    padding: 1.5rem 1rem;
  }
}