/* 共通設定 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: sans-serif;
  background: #f4f4f4;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  padding: 1rem;
}

/* スマホでも見やすい幅と拡大対策 */
.login-container {
  background: white;
  padding: 2em;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  width: 100%;
  max-width: 400px;
}

h2 {
  text-align: center;
  margin-bottom: 1em;
  font-size: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5em;
  font-weight: bold;
  font-size: 1rem;
}

/* 拡大防止のためフォントサイズ1.1rem以上 */
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.6em;
  margin-bottom: 1em;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 1.1rem;
}

button {
  width: 100%;
  padding: 0.9em;
  background-color: #28a745;
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 1.1rem;
  cursor: pointer;
}

button:hover {
  background-color: #218838;
}

.register {
  margin-top: 1em;
  text-align: center;
  font-size: 0.95rem;
}

.register a {
  color: #007bff;
  text-decoration: none;
}

.register a:hover {
  text-decoration: underline;
}

/* サーバーからのレスポンス表示 */
#form-feedback {
  margin: 1em 0;
  padding: 0.75em 1em;
  border-radius: 8px;
  font-size: 0.95rem;
  line-height: 1.4;
  max-width: 400px;
  transition: all 0.3s ease;
}

#form-feedback.error {
  background-color: #ffe0e0;
  color: #a10000;
  border: 1px solid #f5c2c2;
}

#form-feedback.success {
  background-color: #e0ffe8;
  color: #007b3c;
  border: 1px solid #b2f0cc;
}

/* パスワード表示切替 */
.password-wrapper {
  position: relative;
  width: 100%;
}

.password-wrapper input {
  width: 100%;
  padding-right: 2.5em;
  height: 2.5em;
  font-size: 1.1rem;
  box-sizing: border-box;
}

#toggle-password {
  position: absolute;
  right: 0.5em;
  top: 40%;
  width: 1.5em;
  height: 1.5em;
  background: transparent;
  background-image: url("data:image/svg+xml;utf8,<svg fill='gray' viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'><path d='M12 5c-7 0-11 7-11 7s4 7 11 7 11-7 11-7-4-7-11-7zm0 12c-2.8 0-5-2.2-5-5s2.2-5 5-5 5 2.2 5 5-2.2 5-5 5zm0-8c-1.7 0-3 1.3-3 3s1.3 3 3 3 3-1.3 3-3-1.3-3-3-3z'/></svg>");
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
  border: none;
  cursor: pointer;
  opacity: 0.6;
}

#toggle-password:hover {
  opacity: 1;
}

/* レスポンシブ調整 */
@media (max-width: 480px) {
  .login-container {
    padding: 1.5em;
  }

  input[type="text"],
  input[type="password"],
  button {
    font-size: 1.2rem;
  }

  h2 {
    font-size: 1.4rem;
  }
}