/* MODERN SCIENCE NOTEBOOK THEME */

body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #eef3fa;
  color: #2c3e50;
  padding: 2rem;
  max-width: 900px;
  margin: auto;
}

h1 {
  text-align: center;
  margin-bottom: 2rem;
  color: #2a4365;
  font-weight: 600;
}

.section {
  margin-bottom: 2.5rem;
}

.section h2 {
  border-bottom: 2px solid #b3c7e6;
  padding-bottom: 0.4rem;
  color: #1e355f;
  font-weight: 500;
  margin-bottom: 1rem;
}

/* Formula cards */
.formula {
  background: #ffffff;
  padding: 1rem 1.2rem;
  margin-bottom: 1.2rem;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(90, 124, 173, 0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.formula:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 14px rgba(90, 124, 173, 0.15);
}

.formula h3 {
  margin-top: 0;
  font-size: 1.15rem;
  color: #2c3e50;
  font-weight: 500;
  margin-bottom: 0.6rem;
}

/* Buttons */
.copy-btn,
.home-button,
button {
  display: inline-block;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  font-weight: 500;
  background-color: #3056d3;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.copy-btn:hover,
.home-button:hover,
button:hover {
  background-color: #2442a7;
  transform: translateY(-1px);
}

.copy-btn {
  margin-top: 0.6rem;
}

/* Home button (centered below all) */
.home-button {
  display: block;
  margin: 2rem auto 0;
}