body {
  font-family: Arial, sans-serif;
  background: #f8f8f8;
  margin: 0;
  padding: 40px;
  text-align: center;
}
h1 {
  font-size: 32px;
  color: #cc0000;
}
.quote-box {
  margin: 30px auto;
  padding: 30px;
  background: #fffbe7;
  border: 2px solid #ffd700;
  width: 90%;
  max-width: 600px;
  border-radius: 10px;
  box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
}
.quote-text {
  font-family: 'Times New Roman', serif;
  font-size: 24px;
  color: #333;
}
.nav {
  margin-top: 30px;
}
.nav a {
  display: inline-block;
  margin: 10px;
  padding: 10px 20px;
  text-decoration: none;
  background: #0077cc;
  color: white;
  border-radius: 5px;
}
#quote-container {
  position: relative;
  background-size: cover;
  background-position: center;
  width: 90vmin;   /* luôn vuông, giới hạn theo chiều nhỏ hơn */
  height: 90vmin;
  margin: 20px auto;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
}

#quote-text {
  font-size: 24px;
  font-family: 'Times New Roman', serif;
  color: white;
  text-shadow: 2px 2px 4px black;
  padding: 20px;
  text-align: center;
  line-height: 1.5;
}
#quote-container {
  transition: all 0.3s ease;
}
.header {
  text-align: center;
  margin-bottom: 30px;
  padding: 10px;
  background-color: #fdfdfd;
  border-bottom: 1px solid #ddd;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.header h1 {
  color: #cc0000;
  font-size: 28px;
  margin-bottom: 10px;
}

#google-login {
  margin: 10px auto;
  font-size: 14px;
  color: #555;
}

#login-button {
  background: #4285F4;
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
}

#login-button:hover {
  background: #3367d6;
}

#user-email {
  margin-top: 5px;
  font-size: 13px;
  color: #333;
}

#languageSelector {
  margin-top: 8px;
  font-size: 14px;
  padding: 4px 8px;
  border-radius: 4px;
}

.nav {
  margin-top: 15px;
}

.nav a {
  display: inline-block;
  margin: 6px;
  padding: 8px 16px;
  text-decoration: none;
  background: #0077cc;
  color: white;
  border-radius: 5px;
  font-size: 14px;
}

.nav a:hover {
  background: #005fa3;
}


#quote-text {
  transition: opacity 0.3s ease;
}