html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

body {
  font-family: Gadugi, "Microsoft YaHei UI", sans-serif;
  background-color: #ffffff;
  color: #333333;
  min-height: 100vh;
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

.main-content {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
  width: 100%;
}

.main-content > main {
  padding-bottom: 0 !important;
}

.section-title {
  font-size: 24px;
  font-weight: bold;
  color: #000000;
  margin-bottom: 25px;
  padding-bottom: 10px;
  border-bottom: 2px solid #f0f0f0;
  transition: color 0.35s ease, border-color 0.35s ease;
}

:root[data-theme="dark"] .section-title {
  color: #f5f1e8;
  border-bottom-color: #333849;
}

.about-section,
.offline-activities,
.newspaper-distribution {
  margin-bottom: 50px;
}

.online-activities {
  margin-bottom: 30px;
}

.content-card,
.about-content,
.activity-item,
.distribution-item,
.online-link,
.game-btn {
  background-color: #fafafa;
  border-radius: 8px;
  transition: background-color 0.35s ease, transform 0.2s ease;
}

:root[data-theme="dark"] .content-card,
:root[data-theme="dark"] .about-content,
:root[data-theme="dark"] .activity-item,
:root[data-theme="dark"] .distribution-item,
:root[data-theme="dark"] .online-link,
:root[data-theme="dark"] .game-btn {
  background-color: #202330;
}

.about-content {
  padding: 30px;
}

.about-text p {
  margin-bottom: 12px;
  color: #555555;
  font-size: 15px;
  transition: color 0.35s ease;
}

:root[data-theme="dark"] .about-text p {
  color: #c7c1b8;
}

.qq-group,
.activity-name,
.distribution-name,
.link-text h3,
.game-info h3 {
  font-weight: bold;
  color: #000000;
  transition: color 0.35s ease;
}

:root[data-theme="dark"] .qq-group,
:root[data-theme="dark"] .activity-name,
:root[data-theme="dark"] .distribution-name,
:root[data-theme="dark"] .link-text h3,
:root[data-theme="dark"] .game-info h3 {
  color: #f5f1e8;
}

.qq-group {
  font-size: 16px;
  margin-top: 15px;
}

.activity-list,
.distribution-list,
.online-links,
.game-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 15px;
}

.online-links,
.game-buttons {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.activity-item,
.distribution-item {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 15px;
}

.activity-item:hover,
.distribution-item:hover,
.online-link:hover,
.game-btn:hover {
  transform: translateY(-2px);
}

.activity-date,
.link-text p,
.game-info p {
  color: #666666;
  font-size: 14px;
}

:root[data-theme="dark"] .activity-date,
:root[data-theme="dark"] .link-text p,
:root[data-theme="dark"] .game-info p {
  color: #b4aea5;
}

.activity-type {
  margin-left: auto;
  background-color: #f0f0f0;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 14px;
  color: #555555;
}

:root[data-theme="dark"] .activity-type {
  background-color: #303545;
  color: #d9d3ca;
}

.online-link,
.game-btn {
  text-decoration: none;
  padding: 25px;
  display: flex;
  align-items: center;
  gap: 20px;
  color: inherit;
}

.online-link:hover,
.game-btn:hover {
  background-color: #f0f0f0;
}

:root[data-theme="dark"] .online-link:hover,
:root[data-theme="dark"] .game-btn:hover {
  background-color: #2a2f3f;
}

.game-icon-wrapper {
  width: 80px;
  height: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-shrink: 0;
}

.game-icon {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.not-found-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: 60px 20px;
}

.not-found-code {
  font-size: 120px;
  font-weight: bold;
  color: #e0e0e0;
  margin-bottom: 20px;
}

.not-found-message {
  font-size: 22px;
  color: #333333;
  margin-bottom: 15px;
  font-weight: bold;
}

:root[data-theme="dark"] .not-found-message {
  color: #f5f1e8;
}

.not-found-hint {
  font-size: 15px;
  color: #888888;
  margin-bottom: 30px;
  max-width: 400px;
}

.back-home-btn {
  display: inline-block;
  background: #000000;
  color: #ffffff;
  text-decoration: none;
  padding: 12px 35px;
  border-radius: 4px;
}

@media (max-width: 768px) {
  .main-content {
    padding: 30px 15px;
  }

  .section-title {
    font-size: 20px;
  }

  .about-content {
    padding: 20px;
  }

  .activity-list,
  .distribution-list,
  .online-links,
  .game-buttons {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 20px 12px;
  }

  .section-title {
    font-size: 18px;
    margin-bottom: 15px;
  }

  .about-content {
    padding: 15px;
  }

  .about-text p {
    font-size: 14px;
  }
}

.form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
  color: var(--bs-secondary-color);
  text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
  text-align: start;
}