:root {
  --color-background-black: #141414;
  --color-near-black: #111827;
  --color-near-white: #F5F5F7;
  --color-gray-sub: #7F7F7F;
  --color-helix-cyan: #4FF9FF;
  --color-helix-pink: #F56EC1;
  --color-surface-subtle: #424242;
  
  --font-family-base: "Poppins", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--color-background-black);
  color: var(--color-near-white);
  font-family: var(--font-family-base);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

article {
  background-color: var(--color-near-black);
  padding: 40px;
  border-radius: 24px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  width: 100%;
  box-sizing: border-box;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-near-white);
}

h1 {
  font-size: 32px;
  text-align: center;
  margin-top: 0;
  margin-bottom: 40px;
}

h2 {
  font-size: 24px;
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-surface-subtle);
}

p {
  margin-bottom: 16px;
  color: var(--color-near-white);
}

ul, ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

li {
  margin-bottom: 8px;
}

a {
  color: var(--color-helix-cyan);
  text-decoration: none;
  transition: opacity 0.2s ease;
  font-weight: 600;
}

a:hover {
  opacity: 0.8;
  text-decoration: underline;
}

.logo {
  width: 180px;
  height: 180px;
  border-radius: 56px;
  object-fit: cover;
  margin-bottom: 24px;
  box-shadow: 
    0 14px 28px rgba(255, 165, 0, 0.35),
    0 20px 42px rgba(255, 192, 203, 0.25);
}

/* Specific styling for the top page list */
.home-nav {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  width: 100%;
}

.home-nav li {
  width: 100%;
  max-width: 300px;
}

.home-nav a {
  display: block;
  background-color: var(--color-near-black);
  color: var(--color-near-white);
  padding: 16px 24px;
  border-radius: 100px; /* Pill shape */
  text-align: center;
  border: 1px solid var(--color-surface-subtle);
  transition: all 0.2s ease;
}

.home-nav a:hover {
  background-color: var(--color-surface-subtle);
  transform: translateY(-2px);
  text-decoration: none;
  border-color: var(--color-helix-cyan);
}

/* Footer-like links */
.footer-link {
  display: block;
  margin-top: 40px;
  text-align: center;
  font-size: 14px;
  color: var(--color-gray-sub);
}

.footer-link a {
  color: var(--color-gray-sub);
}

.footer-link a:hover {
  color: var(--color-helix-cyan);
}

@media (max-width: 600px) {
  main {
    padding: 20px 16px;
  }
  
  article {
    padding: 24px 16px;
    border-radius: 16px;
  }
  
  h1 {
    font-size: 24px;
    margin-bottom: 24px;
  }
  
  h2 {
    font-size: 20px;
    margin-top: 32px;
  }
  
  .logo {
    width: 120px;
    height: 120px;
    border-radius: 36px;
  }
}