/* Layout styles */
body {
  font-family: "Roboto", Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  padding: 0;
  background-color: #f0f0f0;
  transition: background-color 0.3s, color 0.3s;
  min-height: 100vh; /* Ensures footer is at the bottom */
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0); /* iOS Safari */
  -webkit-touch-callout: none; /* Disable callout, image save panel (iOS Safari) */
  user-select: none; /* Disable text selection */
  -ms-touch-action: manipulation; /* IE 10 */
  touch-action: manipulation; /* Non-prefixed version, currently supported by Chrome, Edge, and Firefox */
}

header {
  width: 100%;
  background-color: #004d40; /* 深绿色 */
  color: white;
  padding: 15px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: transform 0.3s ease-in-out, height 0.3s ease-in-out,
    padding 0.3s ease-in-out;
}

header h1 {
  margin: 0;
  font-size: 2em;
  transition: font-size 0.3s ease-in-out;
}

.header-buttons {
  display: flex;
  align-items: center;
}

header a {
  color: white;
  font-size: 1.5em;
  margin-right: 20px;
  text-decoration: none;
  transition: font-size 0.3s ease-in-out;
}

header button {
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  margin-right: 40px; /* Keep the original margin-right */
  transition: font-size 0.3s ease-in-out;
}

footer {
  width: 100%;
  background-color: #004d40; /* 深绿色 */
  color: white;
  text-align: center;
  padding: 10px 0;
  margin-top: auto; /* Pushes footer to the bottom */
  opacity: 0; /* Start hidden */
  transition: opacity 1s; /* Fade-in effect */
}

footer a {
  color: white;
  text-decoration: none;
}

.load-more {
  padding: 10px 20px;
  margin: 20px 0;
  background-color: #004d40; /* 深绿色 */
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s, opacity 1s; /* Fade-in effect for the button */
  opacity: 0; /* Start hidden */
  display: flex;
  align-items: center;
  justify-content: center;
}

.load-more.loading {
  background-color: #a0a0a0; /* 灰色 */
  cursor: not-allowed;
}

.load-more.loading::after {
  content: "";
  border: 2px solid #fff;
  border-top: 2px solid transparent;
  border-radius: 50%;
  width: 16px;
  height: 16px;
  margin-left: 10px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Dark theme styles */
body.dark {
  background-color: #121212;
  color: #e0e0e0;
}

body.dark header,
body.dark footer {
  background-color: #1e1e1e;
}

/* Loading animation */
#loading {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
}

#loading::after {
  content: "";
  border: 4px solid #004d40;
  border-top: 4px solid transparent;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

#loading.hidden {
  display: none;
}

@media (max-width: 600px) {
  header {
    height: 2.07em;
    padding: 10px 15px;
  }
  header h1 {
    font-size: 1.5em;
  }
  header a {
    font-size: 24px;
  }
  header button {
    margin-right: 30px;
  }
}

@media (min-width: 600px) and (max-width: 1200px) {
  header {
    height: 2.085em;
    padding: 15px 20px;
  }
  header h1 {
    font-size: 1.75em;
  }
  header a {
    font-size: 24px;
  }
  header button {
    margin-right: 40px;
  }
}

@media (min-width: 1200px) {
  header {
    height: 2.1em;
    padding: 20px 30px;
  }
  header h1 {
    font-size: 2em;
  }
  header a {
    font-size: 24px;
  }
  header button {
    margin-right: 50px;
  }
}