body {
  margin: 0;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  font-family: 'Segoe UI', 'Hiragino Kaku Gothic ProN', sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  color: white;
}

.login-container {
  background: rgba(255, 255, 255, 0.08); /* ガラスのような透明感 */
  border-radius: 16px;
  padding: 40px 30px;
  backdrop-filter: blur(15px); /* 背景ぼかし */
  -webkit-backdrop-filter: blur(15px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  width: 90%;
  max-width: 400px;
  box-sizing: border-box;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.1); /* 縁取りで質感を向上 */
}

.login-container h2 {
  font-size: 24px;
  margin-bottom: 30px;
  font-weight: 500;
  letter-spacing: 1px;
}

.form-group {
  margin-bottom: 20px;
  text-align: left;
}

label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  color: #ccc;
}

input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 16px;
  outline: none;
  box-sizing: border-box;
  transition: all 0.3s ease;
}

/* 入力中（フォーカス時）のスタイル */
input:focus {
  background: rgba(255, 255, 255, 0.2);
  border-color: #00c6ff;
}

input::placeholder {
  color: #888;
}

.login-button {
  width: 100%;
  padding: 12px;
  background: #00c6ff;
  border: none;
  border-radius: 8px;
  color: white;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s, transform 0.1s;
  margin-top: 10px;
}

.login-button:hover {
  background: #00a0ce;
}

.login-button:active {
  transform: scale(0.98); /* クリック時の沈み込み */
}

.note {
  margin-top: 25px;
  font-size: 14px;
  color: #aaa;
  line-height: 1.6;
}

.aumin {
  color: #00c6ff;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

.aumin:hover {
  color: #fff;
  text-decoration: underline;
}