:root {
  --bg-primary: #202023;
  --text-primary: rgba(255, 255, 255, 0.92);
  --text-secondary: rgba(255, 255, 255, 0.64);
  --text-muted: #b0b0b0;
  --text-footer: #666666;
  --accent-color: #3ea8ff;
  --underline-color: rgb(82, 82, 82);

  --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial,
    sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  --font-rounded: 'M PLUS Rounded 1c', var(--font-system);

  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 60px;

  --border-radius: 50%;
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.6s ease-out;
}

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

body {
  font-family: var(--font-system);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  opacity: 0;
  animation: fadeIn 0.8s ease-in-out forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: slideInUp 0.6s ease-out forwards;
}

/* アクセシビリティの改善 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  body {
    animation: none;
    opacity: 1;
  }

  .animate-in {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

/* フォーカス表示の改善 */
*:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-lg) 20px;
  position: relative;
}

.content {
  position: relative;
}

.avatar {
  position: absolute;
  right: 0;
  width: 80px;
  height: 80px;
}

.avatar img {
  width: 100%;
  height: 100%;
  border-radius: var(--border-radius);
  object-fit: cover;
  transition: transform var(--transition-medium);
}

header {
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

section {
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-family: var(--font-rounded);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  text-decoration: underline 4px solid var(--underline-color);
  text-underline-offset: var(--spacing-xs);
}

p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.timeline {
  margin-left: 0;
  list-style: none;
}

.timeline-item {
  display: flex;
  margin-bottom: var(--spacing-xs);
  align-items: baseline;
}

.year {
  font-weight: 600;
  color: var(--text-primary);
  min-width: 120px;
  margin-right: var(--spacing-sm);
}

.description {
  color: var(--text-secondary);
}

.piano-link {
  color: var(--text-primary);
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.piano-link:hover {
  color: var(--text-secondary);
}

.social-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition-fast);
  width: fit-content;
  gap: 12px;
  height: 40px;
}

.link:hover {
  color: var(--text-secondary);
  transform: translateY(-2px);
}

.link:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

footer {
  margin-top: var(--spacing-xl);
  text-align: center;
}

footer p {
  font-size: 0.9rem;
  color: var(--text-footer);
}

footer a {
  color: var(--accent-color);
  text-decoration: none;
  transition: text-decoration var(--transition-fast);
}

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

.footer-contact {
  color: white !important;
}

.history-description {
  margin-top: 1.2rem;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
  .container {
    padding: 20px var(--spacing-sm);
  }

  .avatar {
    width: 60px;
    height: 60px;
  }

  header h1 {
    font-size: 2rem;
  }

  .timeline-item {
    flex-direction: row;
    align-items: baseline;
    margin-bottom: 4px;
  }

  .year {
    min-width: 80px;
    margin-right: var(--spacing-md);
    margin-bottom: 0;
    font-size: 0.9rem;
  }

  .description {
    font-size: 0.9rem;
  }

  .social-links {
    margin-top: var(--spacing-md);
    gap: 12px;
    flex-direction: column;
  }
}

@media (max-width: 430px) {
  .social-links {
    margin-top: var(--spacing-md);
    gap: var(--spacing-md);
    flex-direction: column;
  }
}