* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

.container {
  box-sizing: border-box;
  width: 100%;
  max-width: 1560px;
  min-width: 1240px;
  margin: 20px auto;
  color: #333;
}

.container * {
  box-sizing: border-box;
}

header {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 25px;
}

header h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
}

header p {
  font-size: 1rem;
  opacity: 0.9;
}

.box {
  display: flex;
  gap: 20px;
  margin-bottom: 25px;
}

.boxL,
.boxR {
  flex: 1;
  background: #fff;
  padding: 20px;
  border-radius: 12px;
}

h2 {
  font-size: 16px;
  color: #007daa;
  margin-bottom: 8px;
  margin-top: 20px;
}

.form-control {
  margin-bottom: 15px;
}

input[type="text"] {
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  width: 100%;
}

input[type="text"]:focus {
  outline: none;
  border-color: #007daa;
  box-shadow: 0 0 0 2px rgba(0, 125, 170, 0.2);
}

select {
  padding: 9.25px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  width: 100%;
  background-color: white;
}

select:focus {
  outline: none;
  border-color: #007daa;
}

.button-group {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 25px;
}

button {
  padding: 14px 36px;
  border: none;
  border-radius: 4px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 5px;
}

.search-btn {
  background-color: #007daa;
  color: white;
}

.search-btn:hover {
  background-color: #006b94;
}

.clear-btn {
  background-color: #ff7145;
  color: #fff;
}

.clear-btn:hover {
  background-color: #ff5722;
}

.example-btn {
  background-color: #02aa80;
  color: #fff;
}

.example-btn:hover {
  background-color: #158569;
}

.footer {
  text-align: center;
  color: #666;
  font-size: 14px;
}

.features {
  display: flex;
  gap: 20px;
}

.feature {
  flex: 1;
  min-width: 250px;
  padding: 15px;
  text-align: center;
  background: #fff;
  border-radius: 12px;
  margin-bottom: 25px;
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 10px;
}

.feature-title {
  font-weight: bold;
  margin-bottom: 8px;
  font-size: 20px;
  color: #007daa;
}

.notice {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #333;
  color: white;
  padding: 12px 24px;
  border-radius: 4px;
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 1000;
}

.notice.show {
  opacity: 1;
}
.checks{
  margin-top: 10px;
  display: flex;
  align-items: center;
}
input[type="checkbox"] {
  margin-right: 10px;
}

label {
  font-size: 14px;
  color: #666;
}

.advanced-tips {
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  margin-bottom: 25px;
}

.advanced-tips h2 {
  font-size: 20px;
  color: #333;
  margin-bottom: 20px;
  margin-top: 0;
}

.symbols-table {
  margin: 20px 0;
}

.symbols-table table {
  width: 100%;
  border-collapse: collapse;
}

.symbols-table th,
.symbols-table td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

.symbols-table th {
  background-color: #f8f9fa;
  font-weight: bold;
}

.notes {
  margin-top: 20px;
}

.notes ul {
  padding-left: 20px;
  margin-top: 15px;
}

.notes li {
  margin-bottom: 10px;
}

.operator-order {
  font-family: monospace;
  background-color: #f1f2f3;
  padding: 2px 6px;
  border-radius: 4px;
}