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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    background-color: #f5f5f5;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 500px;
}

.login-box {
    background: white;
    border-radius: 8px;
    padding: 60px 40px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.login-title {
    font-size: 32px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 40px;
    color: #333;
}

.error-message {
    background-color: #ffe6e6;
    color: #d32f2f;
    padding: 15px 20px;
    border-radius: 4px;
    margin-bottom: 30px;
    font-size: 14px;
    text-align: center;
}

.login-form {
    width: 100%;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: #666;
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border: 1px solid #ddd;
    border-radius: 4px;
    outline: none;
    transition: border-color 0.3s;
}

.form-input:focus {
    border-color: #6366f1;
}

.form-checkbox {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
}

.form-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 10px;
    cursor: pointer;
}

.form-checkbox label {
    font-size: 14px;
    color: #666;
    cursor: pointer;
}

.login-button {
    width: 100%;
    padding: 16px;
    font-size: 16px;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.login-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.login-button:active {
    transform: translateY(0);
}

.login-footer {
    text-align: center;
    margin-top: 25px;
}

.forgot-password {
    color: #6366f1;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.forgot-password:hover {
    color: #4f46e5;
    text-decoration: underline;
}

/* レスポンシブ対応 */
@media (max-width: 600px) {
    .login-box {
        padding: 40px 30px;
    }
    
    .login-title {
        font-size: 28px;
    }
}