body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: #fff;
  color: #333;
  transition: background-color 0.5s, color 0.5s;
}

header {
  background-color: #4CAF50;
  color: white;
  padding: 1em;
  text-align: center;
}

nav button {
  margin: 0.5em;
  padding: 0.5em 1em;
  background-color: white;
  border: none;
  cursor: pointer;
  font-weight: bold;
}

nav button:hover {
  background-color: #ddd;
}

.top-image {
  width: 100px;
  margin-top: 1em;
  border-radius: 8px;
}

main {
  padding: 1em;
}

.page {
  display: none;
}

.page.active {
  display: block;
}

main {
  background-image: url('https://images.pexels.com/photos/17850566/pexels-photo-17850566.jpeg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  padding: 2em;
  position: relative;
  z-index: 1;
}

/* Overlay for Blue Mode */
body.blue-mode main::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.6); /* semi-transparent white */
  z-index: -1;
}

/* Overlay for Gray Mode */
body.gray-mode main::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4); /* semi-transparent black */
  z-index: -1;
}

  
/* Base Typography */
body {
  font-family: 'Times New Roman',  Times, serif;
  font-size: 17px; /* between 16–18px */
  font-weight: 500; /* between 400–600 */
  margin: 0;
  transition: background-color 0.5s, color 0.5s;
}

/* Light Blue Theme */
body.blue-mode {
  background-color: #e0f7fa; /* light blue */
  color: #004d60;
}

body.blue-mode header,
body.blue-mode footer {
  background-color: #b2ebf2;
}

body.blue-mode nav button {
  background-color: #80deea;
  color: #004d60;
}

/* Deep Gray Theme */
body.gray-mode {
  background-color: #004d60; /* deep teal */
  color: #f0f0f0; /* light text for contrast */
}

body.gray-mode header,
body.gray-mode footer {
  background-color: #dcdcdc;
}

body.gray-mode nav button {
  background-color: #c0c0c0;
  color: #004d60;
}

/* Buttons and Inputs */
nav button {
  margin: 0.5em;
  padding: 0.5em 1em;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
  border-radius: 5px;
}

input, textarea {
  font-size: 16px;
  font-weight: 400;
  padding: 0.5em;
  margin: 0.5em 0;
  width: 100%;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button[type="submit"] {
  background-color: #4CAF50;
  color: white;
  font-weight: 600;
  font-size: 16px;
  border: none;
  padding: 0.5em 1em;
  border-radius: 5px;
}



footer {
  background-color: #4CAF50;
  color: white;
  text-align: center;
  padding: 1em;
}

.note {
  font-style: italic;
  color: #fb6a6a;
}

input, textarea {
  display: block;
  width: 100%;
  margin: 0.5em 0;
  padding: 0.5em;
}

button[type="submit"] {
  background-color: #4CAF50;
  color: white;
  border: none;
  padding: 0.5em 1em;
}

#form-feedback {
  margin-top: 0.5em;
  font-weight: bold;
}

.animated-bg {
  margin-top: 2em;
  animation: fadeIn 3s ease-in-out;
  text-align: center;
}

.animated-bg img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: 12px;
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

/* Light/Dark Mode */
body.dark-mode {
  background-color: #222;
  color: #eee;
}

body.dark-mode header,
body.dark-mode footer {
  background-color: #333;
}

body.dark-mode nav button {
  background-color: #444;
  color: #eee;
}