body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  font-family: "Segoe UI", "Meiryo", sans-serif;
  background-color: #f0f2f5;
  color: #333333;
}

/* --- メイン --- */
.container {
  background-color: #ffffff;
  padding: 25px 40px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  text-align: center;
  width: 90%;
  max-width: 450px;
}

h1 {
  font-size: 1.5em;
  margin-bottom: 10px;
}

p {
  font-size: 0.9em;
  color: #666666;
  margin-bottom: 25px;
}

/* --- reCaptcha風 --- */
.captcha-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #f9f9f9;
  padding: 15px;
  border: 1px solid #dcdcdc;
  border-radius: 4px;
}

#captcha-box {
  display: flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.captcha-logo {
  text-align: center;
}
.captcha-logo img {
  width: 32px;
  height: 32px;
}
.captcha-logo span {
  display: block;
  font-size: 0.6em;
  color: #888888;
}

/* --- チェックボックス --- */
.checkbox {
  position: relative;
  width: 28px;
  height: 28px;
  border: 2px solid #c1c1c1;
  background-color: #ffffff;
  border-radius: 2px;
  transition: all 0.2s ease-in-out;
}
#captcha-box:hover .checkbox {
  border-color: #a1a1a1;
}
.checkbox.checked {
  background-color: #28a745;
  border-color: #28a745;
}

.checkmark {
  font-size: 24px;
  color: #ffffff;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.2s ease-in-out;
}
.checkbox.checked .checkmark {
  opacity: 1;
}

/* --- メッセージ --- */
.label {
  margin-left: 12px;
  font-size: 0.8em;
  font-weight: 500;
}

#message {
  margin-top: 20px;
  font-weight: bold;
  min-height: 20px;
  color: #2c7a2c;
}

/* --- 警告 --- */
.warn-block {
  display: flex;
  align-items: flex-start;
  margin-top: 20px;
  padding: 15px;
  border: 1px solid #ffc107;
  background-color: #fff3cd;
  border-radius: 4px;
  color: #856404;
}
.warn-icon {
  font-size: 20px;
  margin-right: 15px;
  margin-top: -2px;
}
.warn-text p {
  margin: 0;
  font-size: 0.85em;
  text-align: left;
  color: #856404;
}
.warn-text code {
  background-color: rgba(0, 0, 0, 0.08);
  padding: 2px 5px;
  border-radius: 3px;
  font-family: "Courier New", Courier, monospace;
}

/* --- PROTECTED --- */
.content-wrapper {
  padding: 20px;
  border: 1px solid #ccc;
  display: inline-block;
  width: 80vw;
}