* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;
  background: #f5f7fa;
  padding: 30px;
}

/* Notice */
#notice {
  max-width: 400px;
  margin: auto;
  border-radius: 12px;
  padding: 25px;
  background: #ffffff;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
}

#notice h3 {
  font-size: 15px;
  color: #333;
  margin-bottom: 8px;
  margin-top: 16px;
}

#notice h3:first-child {
  margin-top: 0;
}

#notice p {
  font-size: 13px;
  color: #555;
  margin-bottom: 8px;
  line-height: 1.5;
}

#notice label {
  display: block;
  margin-top: 16px;
  font-size: 13px;
  color: #555;
  line-height: 1.5;
}

#notice input[type="checkbox"] {
  margin-right: 8px;
  accent-color: #4a90e2;
}

#notice button {
  width: 100%;
  margin-top: 20px;
  padding: 12px;
  background: #4a90e2;
  color: #fff;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s;
  font-size: 14px;
}

#notice button:hover {
  background: #357abd;
  transform: translateY(-1px);
}

/* App */
#app {
  display: none;
}

fieldset {
  max-width: 400px;
  margin: auto;
  border: none;
  border-radius: 12px;
  padding: 25px;
  background: #ffffff;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.06);
}

fieldset label {
  display: block;
  margin-bottom: 6px;
  margin-top: 15px;
  font-size: 13px;
  font-weight: 600;
  color: #555;
}

fieldset input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #dcdcdc;
  border-radius: 8px;
  font-size: 14px;
  transition: all 0.2s ease;
}

fieldset input[type="text"]:focus {
  border-color: #4a90e2;
  outline: none;
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.15);
}

fieldset input[type="button"] {
  width: 100%;
  margin-top: 20px;
  padding: 12px;
  background: #4a90e2;
  color: #fff;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s;
  font-size: 14px;
}

fieldset input[type="button"]:hover {
  background: #357abd;
  transform: translateY(-1px);
}

#result {
  display: block;
  max-width: 400px;
  margin: 20px auto;
  padding: 12px;
  text-align: center;
  background: #ffffff;
  border-radius: 8px;
  color: #4a90e2;
  text-decoration: none;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  word-break: break-all;
  transition: 0.2s;
}

#result:hover {
  background: #4a90e2;
  color: #fff;
}

.status {
  max-width: 400px;
  margin: 10px auto;
  padding: 12px;
  border-radius: 8px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
}

.status.checking {
  background: #fff8e1;
  color: #f59e0b;
}

.status.success {
  background: #e6f4ea;
  color: #2e7d32;
}

.status.error {
  background: #fdecea;
  color: #c62828;
}