body {
  font-family: 'Arial', sans-serif;
  background: linear-gradient(to bottom right, #6a11cb, #2575fc);
  color: #ffd700;
  text-align: center;
  padding: 20px;
}

.container {
  max-width: 1000px;
  margin: auto;
}

h1 {
  font-size: 3em;
  margin-bottom: 20px;
}

h2 {
  color: #00ffe7;
  margin-top: 20px;
}

label {
  display: block;
  margin: 10px 0 5px;
  font-size: 1.2em;
  color: #ffbb33;
}

input, select {
  padding: 12px;
  width: 60%;
  border-radius: 8px;
  border: none;
  margin-bottom: 15px;
  font-size: 1em;
  font-weight: bold;
  background: linear-gradient(145deg, #ffe259, #ffa751);
  transition: 0.3s;
  color: #4a148c;
}

input:focus, select:focus {
  outline: none;
  background: linear-gradient(145deg, #ff512f, #dd2476);
  color: #fff;
}

/* Colorful Muscle Select */
.colorful-select {
  background: linear-gradient(45deg, #ff512f, #dd2476, #f7971e);
  color: #fff;
  font-weight: bold;
  font-size: 1em;
}

button {
  padding: 12px 20px;
  margin: 5px;
  border: none;
  border-radius: 12px;
  font-size: 1em;
  cursor: pointer;
  font-weight: bold;
  transition: all 0.3s;
}

button:hover {
  transform: scale(1.05);
  filter: brightness(1.1);
}

.main-btn {
  background: linear-gradient(to right, #ff512f, #dd2476);
  color: #fff;
}

.sub-choice-btn {
  background: linear-gradient(to right, #56ab2f, #a8e063);
  color: #2c3e50;
}

.bmr-text {
  font-size: 1.3em;
  font-weight: bold;
  color: #00ffea;
}

.protein-text {
  font-size: 1.2em;
  font-weight: bold;
  color: #ff6e6e;
}

#dietList, #mentalList, #muscleList, #yogaList {
  text-align: left;
  margin: 20px auto;
  max-width: 900px;
}

.diet-item, .mental-item, .exercise-item, .yoga-item {
  background: rgba(255, 255, 255, 0.1);
  padding: 12px;
  margin: 10px 0;
  border-radius: 10px;
  color: #ffdd57;
}

.exercise-item iframe {
  width: 100%;
  height: 300px;
  margin-top: 5px;
  border-radius: 10px;
}

.pro-tip {
  font-weight: bold;
  font-size: 1em;
  color: #ff6e6e;
  margin-bottom: 10px;
}

#topBtn {
  background: linear-gradient(to right, #ff6a00, #ee0979);
  color: #fff;
  position: fixed;
  bottom: 20px;
  right: 20px;
  border-radius: 50px;
  padding: 10px 20px;
  display: block;
  cursor: pointer;
  z-index: 99;
}