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

body {
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: #f1f5f9;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  padding: 20px;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

header,
nav,
.version-section {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 16px;
  backdrop-filter: blur(10px);
}

header {
  text-align: center;
  margin-bottom: 40px;
  padding: 30px 20px;
}

h1 {
  color: #818cf8;
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.subtitle {
  color: #cbd5e1;
  font-size: 1.2rem;
}

nav {
  margin-bottom: 30px;
  padding: 15px;
  text-align: center;
}

nav ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 15px;
  list-style: none;
}

nav a {
  color: #93c5fd;
  text-decoration: none;
  padding: 8px 15px;
  border-radius: 20px;
  background: rgba(79, 70, 229, 0.2);
  display: block;
}

.version-section {
  margin-bottom: 30px;
  padding: 25px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.v00-v04 {
  border-left: 5px solid #64748b;
}

.v05 {
  border-left: 5px solid #38bdf8;
}

.v06 {
  border-left: 5px solid #8b5cf6;
}

h2 {
  color: #c7d2fe;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(203, 213, 225, 0.1);
}

h3 {
  color: #a5b4fc;
  margin: 15px 0 10px;
  font-size: 1.3rem;
}

h4 {
  color: #93c5fd;
  margin: 15px 0 8px;
  font-size: 1.1rem;
}

.phase-badge,
.year-marker {
  display: inline-block;
  color: white;
  border-radius: 20px;
  margin: 5px 10px 5px 0;
}

.phase-badge {
  background: #4f46e5;
  padding: 5px 12px;
  font-size: 0.85rem;
  font-weight: bold;
}

.year-marker {
  background: #475569;
  padding: 4px 10px;
  font-size: 0.8rem;
}

ul {
  padding-left: 25px;
  margin: 10px 0;
}

li {
  margin-bottom: 8px;
  line-height: 1.5;
}

footer {
  margin-top: 40px;
  text-align: center;
  color: #94a3b8;
  font-size: 0.9rem;
  padding: 20px;
}

@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  .container {
    padding: 10px;
  }

  header {
    padding: 20px 15px;
    margin-bottom: 25px;
  }

  h1 {
    font-size: 2rem;
  }

  nav ul {
    flex-direction: column;
    align-items: center;
    gap: 10px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.6rem;
  }

  .subtitle {
    font-size: 0.9rem;
  }

  .version-section {
    padding: 15px 10px;
  }

  h2 {
    font-size: 1.2rem;
  }
}