:root {
  --primary-color: #e5eef1;
  --secondary-color: #f8f9fa;
  --text-color: #333;
  --link-color: #4a6572;
  --hover-color: #344955;
  --accent-color: #7cb342;
}
body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: #f0f5f9;
  margin: 0;
  padding: 0;
}
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
  box-sizing: border-box;
}
header {
  background-color: var(--primary-color);
  color: var(--text-color);
  padding: 1rem 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  display: flex;
  align-items: center;
}
.logo img {
  width: 50px;
  height: 50px;
  margin-right: 10px;
}
.logo h1 {
  font-size: 1.5rem;
  margin: 0;
  color: var(--link-color);
}
.user-actions {
  display: flex;
  gap: 1rem;
}
.user-actions a {
  color: var(--link-color);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}
.user-actions a:hover {
  color: var(--hover-color);
  text-decoration: underline;
}
.writing-service-link {
  background-color: var(--accent-color);
  color: white !important;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-weight: bold;
  text-decoration: none !important;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.writing-service-link:hover {
  background-color: #ff4757;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
.writing-service-link::before {
  content: "✍️";
  font-size: 1.2em;
}
.content {
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  margin: 2rem auto;
  padding: 2rem;
}
.year-section {
  margin-bottom: 2rem;
}
.year-title {
  font-size: 1.5rem;
  color: var(--link-color);
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}
.issue-list {
  list-style-type: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1rem;
}
.issue-list li {
  background-color: var(--primary-color);
  border-radius: 4px;
  padding: 0.5rem;
  text-align: center;
  transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}
.issue-list li:hover {
  background-color: #d0dde3;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.issue-list a {
  color: var(--link-color);
  text-decoration: none;
  font-weight: bold;
  transition: color 0.3s ease;
  display: block;
  width: 100%;
  height: 100%;
}
.issue-list a:hover {
  color: var(--hover-color);
}
footer {
  text-align: center;
  padding: 1rem 0;
  background-color: var(--primary-color);
  color: var(--text-color);
  box-shadow: 0 -2px 4px rgba(0,0,0,0.1);
}
.friend-links {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid #ddd;
}
.friend-links h3 {
  color: var(--link-color);
  margin-bottom: 0.5rem;
}
.friend-links ul {
  list-style-type: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}
.friend-links li {
  background-color: var(--secondary-color);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: background-color 0.3s ease;
}
.friend-links li:hover {
  background-color: var(--primary-color);
}
.friend-links a {
  color: var(--link-color);
  text-decoration: none;
  font-size: 0.9rem;
}
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }
  .user-actions {
    margin-top: 1rem;
  }
  .content {
    padding: 1rem;
  }
  .issue-list {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
}
@media (max-width: 480px) {
  .issue-list {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  }
  .friend-links ul {
    flex-direction: column;
    align-items: center;
  }
}
.banner-ad {
  width: 100%;
  max-height: 200px;
  overflow: hidden;
  position: relative;
  background-color: #f8f9fa;
  margin: 2rem 0;
}

.banner-ad img {
  width: 100%;
  height: auto;
  display: block;
  max-height: 200px;
  object-fit: cover;
}

.banner-ad a {
  display: block;
  width: 100%;
}