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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #1a1a1a;
  background: #fafaf8;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

header {
  border-bottom: 1px solid #e5e5e0;
  padding-bottom: 24px;
  margin-bottom: 40px;
}

header a { text-decoration: none; color: inherit; }

.app-name {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #1a1a1a;
}

nav {
  margin-top: 12px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

nav a {
  font-size: 0.9rem;
  color: #555;
  text-decoration: none;
}

nav a:hover { color: #1a1a1a; text-decoration: underline; }

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.meta {
  font-size: 0.85rem;
  color: #888;
  margin-bottom: 36px;
}

h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 32px 0 10px;
}

p { margin-bottom: 16px; }

ul {
  margin: 0 0 16px 20px;
}

ul li { margin-bottom: 6px; }

a { color: #2563eb; }
a:hover { text-decoration: underline; }

.home-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.home-links a {
  display: block;
  padding: 20px;
  border: 1px solid #e5e5e0;
  border-radius: 8px;
  text-decoration: none;
  color: #1a1a1a;
  background: #fff;
  transition: border-color 0.15s;
}

.home-links a:hover { border-color: #aaa; }

.home-links .link-title {
  font-weight: 600;
  margin-bottom: 4px;
}

.home-links .link-desc {
  font-size: 0.85rem;
  color: #666;
}

footer {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid #e5e5e0;
  font-size: 0.82rem;
  color: #999;
}