/* ==================== Global Styles ==================== */

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

html, body {
  height: 100%;
  width: 100%;
}

body {
  background-color: #ffffff;
  color: #333333;
  font-family: 'Noto Sans JP', sans-serif;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

/* ==================== Navigation ==================== */

.main-nav {
  background-color: #f8f8f8;
  border-bottom: 1px solid #e0e0e0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
  padding: 1rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: #333333;
  text-decoration: none;
  letter-spacing: -0.5px;
}

.nav-brand:hover {
  color: #666666;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-menu a {
  color: #666666;
  text-decoration: none;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  padding-bottom: 0.25rem;
  transition: all 0.3s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: #333333;
  border-bottom-color: #333333;
}

/* ==================== Main Content ==================== */

main > * {
  width: 100%;
  max-width: 900px;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
  color: #222222;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

a {
  color: #0066cc;
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 102, 204, 0.3);
}

a:hover {
  border-bottom-color: #0066cc;
}

a img {
  border: none;
}

p {
  margin-bottom: 1rem;
  text-align: justify;
}

code {
  background-color: #f5f5f5;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
}

pre {
  background-color: #f5f5f5;
  padding: 1rem;
  border-radius: 5px;
  overflow-x: auto;
  margin-bottom: 1rem;
  border-left: 3px solid #0066cc;
}

pre code {
  background-color: transparent;
  padding: 0;
}

blockquote {
  border-left: 4px solid #0066cc;
  padding-left: 1rem;
  margin: 1rem 0;
  color: #666666;
  font-style: italic;
}

ul, ol {
  margin-left: 2rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.5rem;
}

/* ==================== Home Page ==================== */

.home-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  max-width: 600px;
  width: 100%;
}

#profile-img {
  border-radius: 25%;
  max-width: 250px;
  max-height: 250px;
  width: 100%;
  height: auto;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.home-section h1 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 1.2rem;
  color: #666666;
  margin-bottom: 1.5rem;
}

.intro {
  text-align: left;
  max-width: 400px;
}

.intro p {
  text-align: justify;
  line-height: 1.8;
}

/* ==================== Pages ==================== */

.page-content {
  width: 100%;
  max-width: 700px;
}

.page-content h1 {
  margin-top: 0;
  margin-bottom: 1.5rem;
}

/* ==================== Projects Page ==================== */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.project-card {
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 1.5rem;
  transition: all 0.3s ease;
  background-color: #fafafa;
}

.project-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-color: #0066cc;
  background-color: #ffffff;
}

.project-card h3 {
  margin-top: 0;
  color: #333333;
}

.project-card p {
  color: #666666;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.project-link {
  color: #0066cc;
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  margin-right: 1rem;
}

.project-link:hover {
  text-decoration: underline;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.project-tag {
  background-color: #e8f0ff;
  color: #0066cc;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
}

/* ==================== Blog Posts ==================== */

.post-content {
  width: 100%;
  max-width: 700px;
}

.post-header {
  margin-bottom: 2rem;
  border-bottom: 2px solid #f0f0f0;
  padding-bottom: 1.5rem;
}

.post-title {
  margin-top: 0;
  margin-bottom: 1rem;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: #999999;
  font-size: 0.95rem;
}

.post-categories {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.category {
  background-color: #f0f0f0;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  color: #666666;
}

.post-body {
  margin-bottom: 2rem;
}

.post-body h2 {
  margin-top: 2rem;
  padding-top: 1rem;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}

.post-body table th,
.post-body table td {
  border: 1px solid #ddd;
  padding: 0.75rem;
  text-align: left;
}

.post-body table th {
  background-color: #f5f5f5;
  font-weight: 600;
}

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 2px solid #f0f0f0;
  padding-top: 1.5rem;
  margin-top: 2rem;
}

.post-nav a {
  flex: 1;
  padding: 1rem;
  border: 1px solid #e0e0e0;
  border-radius: 5px;
  transition: all 0.3s ease;
  text-align: center;
}

.post-nav a:hover {
  background-color: #f5f5f5;
  border-color: #0066cc;
}

.prev-post {
  text-align: left;
}

.next-post {
  text-align: right;
}

/* ==================== Blog Archive ==================== */

.blog-archive {
  width: 100%;
}

.posts-list {
  list-style: none;
  margin-top: 2rem;
}

.post-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1rem 0;
  border-bottom: 1px solid #f0f0f0;
  gap: 1rem;
}

.post-item:last-child {
  border-bottom: none;
}

.post-item-link {
  flex: 1;
  text-decoration: none;
  color: #333333;
  font-weight: 500;
}

.post-item-link:hover {
  color: #0066cc;
}

.post-item-date {
  color: #999999;
  font-size: 0.9rem;
  white-space: nowrap;
}

.year-header {
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: #666666;
}

.year-header:first-of-type {
  margin-top: 0;
}

/* ==================== Footer ==================== */

.main-footer {
  background-color: #f8f8f8;
  border-top: 1px solid #e0e0e0;
  padding: 2rem 1rem;
  text-align: center;
  margin-top: auto;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: #e8e8e8;
  transition: all 0.3s ease;
  border: none;
}

.social-links a:hover {
  background-color: #333333;
  border: none;
}

.social-links img {
  width: 24px;
  height: 24px;
  filter: invert(0);
}

.social-links a:hover img {
  filter: invert(1);
}

.footer-text {
  font-size: 0.9rem;
  color: #999999;
  margin: 0;
}

/* ==================== Responsive Design ==================== */

@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }

  .nav-menu {
    gap: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.2rem;
  }

  #profile-img {
    max-width: 180px;
    max-height: 180px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .post-nav {
    flex-direction: column;
  }

  .post-item {
    flex-direction: column;
    gap: 0.5rem;
  }

  main {
    padding: 1.5rem 1rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 14px;
  }

  main {
    padding: 1rem;
  }

  .nav-menu {
    gap: 0.75rem;
    font-size: 0.9rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .social-links {
    gap: 1rem;
  }
}