body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Arial, sans-serif;
  background: #0f0f0f;
  color: #eaeaea;
  line-height: 1.6;
}

nav {
  position: sticky;
  top: 0;
  background: #0f0f0f;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 16px 24px;
  display: flex;
  gap: 24px;
  z-index: 10;
}

nav a {
  color: #9ecbff;
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 64px 24px;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 24px;
}

h2 {
  font-size: 1.4rem;
  margin-top: 48px;
}

p, li {
  color: #d0d0d0;
  font-size: 1.05rem;
}

ul {
  padding-left: 20px;
}

.notice {
  margin-top: 48px;
  padding: 20px 24px;
  background: rgba(255,255,255,0.04);
  border-left: 3px solid #888;
  font-size: 0.95rem;
}

footer {
  text-align: center;
  padding: 32px;
  color: #9a9a9a;
  font-size: 0.9rem;
}
a {
  color: #8fb3d9;
  text-decoration: none;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

a:hover {
  color: #cfe3ff;
  text-decoration: underline;
  text-decoration-color: rgba(207, 227, 255, 0.6);
}
.portrait {
  display: flex;
  justify-content: center;
  margin-bottom: 48px;
}

.portrait img {
  max-width: 220px;
  width: 100%;
  height: auto;
  border-radius: 6px;
  filter: grayscale(100%) contrast(1.05);
  opacity: 0.92;
  box-shadow: 0 8px 30px rgba(0,0,0,0.6);
}