body {
    font-family: Arial, sans-serif;
    font-size: 14px;
    background: #f4f7f8;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0;
}

/* ロゴ */
.logo {
    text-align: center;
    margin-bottom: 5px;
}
.logo img {
    max-width: 250px;
    height: 60px;
}

/* フォーム枠 */
.container {
    background: #fff;
    padding: 0px 40px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(124, 108, 108, 0.1);
    width: 100%;
    max-width: 400px;
}

h2 {
    text-align: center;
    font-size: 18px;
    margin-bottom: 5px;
    color: #333;
}

label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: bold;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

input:focus {
    border-color: #007BFF;
    outline: none;
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #9fb4cc, #84a3b3);
    border: none;
    border-radius: 30px;
    color: #fff;
    font-size: 14px;
    font-weight: bold;
    letter-spacing: 1px;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,123,255,0.3);
    transition: all 0.3s ease;
}

.btn-submit:hover {
    background: linear-gradient(135deg, #0056b3, #0077cc);
    box-shadow: 0 6px 15px rgba(0,123,255,0.4);
    transform: translateY(-2px);
}

.btn-submit:active {
    transform: translateY(0);
    box-shadow: 0 3px 8px rgba(0,123,255,0.3);
}