.tool-page-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
}

.back-to-home {
  max-width: 600px;
  width: 100%;
  margin-bottom: 10px;
  margin-left: auto;
  margin-right: auto;
  text-align: left;
  padding: 0 20px;
  box-sizing: border-box;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  background-color: #6c757d;
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  font-size: 1em;
  transition: background-color 0.3s ease, transform 0.2s ease;
  border: none;
  cursor: pointer;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.back-btn:hover {
  background-color: #5a6268;
  transform: translateY(-2px);
}

.back-btn i {
  margin-right: 8px;
  font-size: 1.1em;
}

.datetime-calculator-container {
  display: block;
  width: 100%;
  max-width: 600px;
}

.calculator-section {
  background-color: #ffffff;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  padding: 30px;
  margin-bottom: 30px;
}

.calculator-section h2 {
  font-size: 1.3em;
  margin-bottom: 20px;
  color: #34495e;
  text-align: left;
}

.input-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.date-fields {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.input-group label {
  font-size: 1.1em;
  font-weight: bold;
  color: #34495e;
}

.input-group input,
.input-group select {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1em;
  max-width: 100px;
  box-sizing: border-box;
}

.set-today-btn {
  background-color: #007bff;
  color: #fff;
  padding: 10px 15px;
  border: none;
  border-radius: 8px;
  font-size: 0.95em;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.set-today-btn:hover {
  background-color: #0056b3;
}

.calculate-btn,
.clear-btn {
  width: 100%;
  padding: 15px 20px;
  font-size: 1.1em;
  font-weight: bold;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  margin-top: 10px;
}

.calculate-btn {
  background-color: #28a745;
  color: white;
}

.calculate-btn:hover {
  background-color: #218838;
}

.clear-btn {
  background-color: #dc3545;
  color: white;
}

.clear-btn:hover {
  background-color: #c82333;
}

.result-group textarea {
  width: 100%;
  min-height: 60px;
  padding: 12px;
  font-size: 1em;
  border: 1px solid #ddd;
  border-radius: 8px;
  background-color: #f8f9fa;
  font-family: 'Courier New', Courier, monospace;
  resize: vertical;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .calculator-section {
    padding: 20px;
  }

  .input-group label {
    font-size: 1em;
  }

  .set-today-btn,
  .calculate-btn,
  .clear-btn {
    font-size: 1em;
    padding: 10px 15px;
  }
}

@media (max-width: 600px) {
  .back-to-home {
    padding: 0 15px;
    margin-bottom: 20px;
  }

  .back-btn {
    padding: 8px 15px;
    font-size: 0.9em;
  }
}